A spiral resonator

Abstract

The embodiment of the present application provides a spiral resonator, comprising: a resonant cavity body, the interior of which is a cylindrical hollow structure; a spiral coil, disposed within the resonant cavity body, the spiral coil comprising at least one spiral wire; an antenna cover, disposed on one end of the resonant cavity body; an antenna coil, fixed to the antenna cover and located within the resonant cavity body, and coaxially arranged relative to the spiral coil; and a tunable electric core, comprising an adjustment device and a magnetic core, the magnetic core being mounted on the antenna cover and partially located within the resonant cavity body; the antenna coil being sleeved on the outside of the magnetic core and coaxially arranged with the magnetic core; the magnetic core being inserted into the antenna cover and movably connected to the antenna cover; and an adjustment device connected to the magnetic core, configured to drive the magnetic core to move axially relative to the antenna cover along the antenna coil to adjust the length of the magnetic core within the resonant cavity body. By adding a tunable electric core, this solution can achieve fine tuning of impedance matching.

Description

Technical Field

[0001] This article relates to but is not limited to the field of resonator technology, and in particular to a spiral resonator. Background Art

[0002] Ion quantum computing encodes information in the electronic internal states of charged ions, using lasers or microwaves to perform coherent quantum operations and implement corresponding quantum algorithms. Ion quantum computing relies on ion traps to generate electromagnetic fields, forming potential fields that bind charged ions in space, allowing them to be stably trapped in a passive vacuum.

[0003] The ion trap structure used for quantum computing mostly adopts a linear Paul trap, that is, a DC voltage is used to form an axial (z-axis) static potential well, and a radio frequency voltage is used to form a radio frequency potential well in the radial direction (x and y axes). Due to the high frequency (about 1 to 100 MHz), the radio frequency potential well can be equivalent to forming a bound pseudopotential in the radial direction, thereby realizing the confinement of ions in three-dimensional space. Figure 1 This is a schematic diagram of the electrical connections for a linear Paul trap. A DC voltage is applied to the DC electrodes of the ion trap via a DC signal source and filtering circuit (not shown); the RF signal must pass through an RF amplifier. Because the RF electrodes of an ion trap are not the 50-ohm loads of conventional transmission lines, applying an RF voltage directly to the electrodes will reflect most of the power back to the amplifier. The actual voltage at the electrodes is still too low to meet the requirements for ion confinement. Therefore, a device such as a spiral resonant cavity is required to achieve impedance matching between the RF amplifier and the ion trap device, and to further amplify the RF voltage signal at the RF electrodes. The voltage applied to the RF electrodes, V, is ∝√PQ, where P is the RF power output by the amplifier and Q is the quality factor of the spiral resonant cavity. A higher Q corresponds to a higher voltage amplification factor.

[0004] Attachment Figure 2 This is a schematic diagram of the appearance of a traditional spiral resonator. A complete spiral resonator uses a copper circular tube as the resonant cavity body 1', with multiple radio frequency interfaces to provide input and output of electrical signals. In addition, there are one or two copper wires (i.e. spiral coils 2') connected to the ion trap electrodes. Figure 3 This is a cross-sectional diagram of a traditional spiral resonator. A copper tube contains a copper spiral wire, which is fixed inside the copper tube by an insulating PVC plate. A wound antenna (i.e., antenna coil 4') provides input for the RF signal. In order to achieve impedance matching between the ion trap electrode and the RF amplifier, it is necessary to adjust the antenna pitch and antenna cover 3' to change the position of the antenna inside the copper tube. After the adjustment is completed, the antenna cover 3' can be fixed by means such as screws. However, in traditional designs, the movement of the antenna cover 3' is mainly through manual adjustment, which cannot achieve fine tuning, and the unstable structure makes tuning difficult. Summary of the Invention

[0005] An embodiment of the present application provides a spiral resonator, which can achieve fine tuning of impedance matching by adding a tunable battery cell.

[0006] To this end, an embodiment of the present application provides a spiral resonator, comprising: a resonant cavity body, the interior of the resonant cavity body being a cylindrical hollow structure; a spiral coil, arranged in the resonant cavity body, the spiral coil comprising at least one spiral wire; an antenna cover, covering one end of the resonant cavity body; an antenna coil, fixed to the antenna cover, located in the resonant cavity body, and coaxially arranged relative to the spiral coil; and a tunable electric core, comprising an adjustment device and a magnetic core, the magnetic core being installed on the antenna cover and partially located in the resonant cavity body; the antenna coil being sleeved on the outside of the magnetic core and coaxially arranged with the magnetic core; the magnetic core being inserted into the antenna cover and movably connected to the antenna cover; the adjustment device being connected to the magnetic core, and being configured to drive the magnetic core to move relative to the antenna cover along the axial direction of the antenna coil to adjust the length of the magnetic core in the resonant cavity body.

[0007] Compared with the traditional design, this solution adds a tunable core. A part of the magnetic core of the tunable core is located in the main body of the resonant cavity and inside the antenna coil. Therefore, the part of the magnetic core located in the main body of the resonant cavity and the antenna coil constitute an inductance system. The change in the length of the magnetic core in the antenna coil can cause the inductance value of the inductance system to change, and then change the mutual inductance value between the inductance system and the spiral coil, so that the impedance matching between the inductance system and the load system composed of the spiral coil and the load (the radio frequency electrode of the ion trap) can be achieved, that is, the impedance matching between the radio frequency amplifier and the ion trap electrode can be achieved. In this way, by adjusting the length of the magnetic core located in the main body of the resonant cavity through the adjustment device, the length of the magnetic core inserted into the antenna coil can be adjusted, that is, fine tuning of the spiral resonator can be achieved, and then fine adjustment of the impedance matching can be achieved.

[0008] In an exemplary embodiment, the adjustment device is at least partially located outside the resonant cavity body.

[0009] In an exemplary embodiment, the adjustment device includes: a threaded adjustment member, which is threadedly connected to the antenna cover and fixedly connected to the magnetic core, and the threaded adjustment member is configured to rotate relative to the antenna cover to drive the magnetic core to move axially relative to the antenna cover along the antenna coil.

[0010] In an exemplary embodiment, the adjusting device includes a micrometer head, which includes an adjusting structure and a micrometer screw, and the micrometer screw is fixedly connected to the magnetic core; the adjusting structure is connected to the micrometer screw and is configured to drive the micrometer screw to move axially along the antenna coil to drive the magnetic core to move axially along the antenna coil relative to the antenna cover.

[0011] In an exemplary embodiment, one end of the micrometer screw is located inside the resonant cavity body and fixedly connected to the magnetic core, and the adjustment structure is located outside the resonant cavity body and connected to the micrometer screw.

[0012] In an exemplary embodiment, the adjustment device includes a piezoelectric ceramic, one end of which is fixed to the antenna cover, and the other end of which is fixedly connected to the magnetic core. The piezoelectric ceramic is configured to change the voltage to change the length of the piezoelectric ceramic, thereby driving the magnetic core to move axially relative to the antenna cover along the antenna coil.

[0013] In an exemplary embodiment, the outer side wall of the resonant cavity body includes a first side wall, the first side wall is provided with a radio frequency connector, and the first side wall is configured to be planar; and / or, the outer side wall of the resonant cavity body includes a second side wall, the second side wall is configured to be planar, and the second side wall is configured to be fixedly connected to the base to fix the spiral resonator to the base.

[0014] In an exemplary embodiment, the outer wall of the resonant cavity body is in the shape of a rectangular parallelepiped.

[0015] In an exemplary embodiment, the helical resonator further includes: an end cover, which is provided on an end of the resonant cavity body away from the antenna cover, and the output end of the spiral coil extends through the end cover to the vacuum electrical feedthrough to be connected to the ion trap radio frequency electrode; and an electrical feedthrough shielding cover, which is connected to the end cover and is configured to cover the vacuum electrical feedthrough.

[0016] In an exemplary embodiment, the helical resonator further includes: a first insulating bracket, disposed in the resonant cavity body and configured to fix the main body of the helical coil.

[0017] In an exemplary embodiment, the first insulating support includes: a plurality of sub-supports spaced apart along the circumference of the spiral coil, the sub-supports are provided with spiral grooves corresponding to the spiral coils, and the spiral coils are partially embedded in the spiral grooves.

[0018] In an exemplary embodiment, the helical resonator further includes: a second insulating support,

[0019] The output connector of the spiral coil is fixed in the resonant cavity body; and / or a third insulating bracket is provided in the resonant cavity body and fixedly connected to the antenna cover.

[0020] The snare is arranged on the third insulating bracket.

[0021] In an exemplary embodiment, the antenna cover is detachably connected to the resonant cavity body.

[0022] Other features and advantages of the present application will be described in the following description and will be explained in part in the following description.

[0023] Other advantages of the present application may be realized and obtained through the solutions described in the specification and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide an understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0025] Figure 1 Schematic diagram of the electrical connection of the ion trap;

[0026] Figure 2 Schematic diagram of the appearance structure of a traditional spiral resonator;

[0027] Figure 3 Schematic diagram of the cross-sectional structure of a traditional spiral resonator;

[0028] Figure 4 A schematic diagram of the appearance and structure of a spiral resonator provided in an embodiment of the present application;

[0029] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure of the spiral resonator shown.

[0030] 0Among them, Figure 2 and Figure 3 The accompanying drawings are described as follows:

[0031] 1' resonant cavity body, 2' helical coil; 3' antenna cover, 4' antenna coil;

[0032] Figure 4 and Figure 5 The accompanying drawings are described as follows:

[0033] 1 resonant cavity body, 11 RF input connector, 12 RF output connector; 2 spiral coils; 3 days

[0034] Wire cover, 31 antenna connector; 4 antenna coil; 5 tunable core, 51 magnetic core, 52 adjustment device; 5 6 end cap; 7 electric feedthrough shield; 91 first insulating bracket, 92 second insulating bracket, 93 third insulating

[0035] bracket. DETAILED DESCRIPTION

[0036] To make the purpose, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of the present application can be combined with each other in any manner.

[0037] like Figure 4 and Figure 5 As shown, an embodiment of the present application provides a helical resonator, comprising: a resonant cavity body 1, a helical coil 2, an antenna cover 3, an antenna coil 4 and a tunable battery core 5.

[0038] The interior of the resonant cavity body 1 is a cylindrical hollow structure.

[0039] The spiral coil 2 is disposed in the resonant cavity body 1 , and the spiral coil 2 includes at least one spiral wire.

[0040] The antenna cover 3 is disposed on one end of the resonant cavity body 1 .

[0041] The antenna coil 4 is fixed to the antenna cover 3 , is located in the resonant cavity body 1 , and is coaxially arranged opposite to the helical coil 2 .

[0042] The tunable battery core 5 includes an adjustment device 52 and a magnetic core 51. The magnetic core 51 is mounted on the antenna cover 3 and is partially located inside the resonant cavity body 1. The antenna coil 4 is sleeved on the outside of the magnetic core 51 and is coaxially arranged with the magnetic core 51. The magnetic core 51 is inserted into the antenna cover 3 and is movably connected to the antenna cover 3. The adjustment device 52 is connected to the magnetic core 51 and is configured to drive the magnetic core 51 to move axially relative to the antenna cover 3 along the antenna coil 4 to adjust the length of the magnetic core 51 inside the resonant cavity body 1.

[0043] It should be noted that, in the embodiment of the present application, although the magnetic core 51 is coaxial with the antenna coil 4 and the antenna coil 4 is coaxial with the spiral coil 2, during the specific implementation, a certain error between their axes can be allowed and they can deviate from each other.

[0044] The spiral resonator provided in the embodiment of the present application includes a resonant cavity body 1, a spiral coil 2, an antenna cover 3, an antenna coil 4 and a tunable battery core 5. The resonant cavity body 1 constitutes the main part of the spiral resonator shell, and the hollow structure inside the resonant cavity body 1 is cylindrical, forming a spiral resonant cavity. The material of the resonant cavity body 1 is a good conductor, such as copper, gold, silver, or copper plated with silver, copper plated with gold, etc. The antenna cover 3 is connected to one end of the resonant cavity body 1 and covers the end of the resonant cavity body 1, so that the antenna cover 3 also constitutes a part of the spiral resonator shell.

[0045] Both the helical coil 2 and antenna coil 4 are located within the resonant cavity body 1 and are helical in shape, transferring energy through mutual induction. The outer surface of the antenna cover 3 is typically provided with an antenna connector 31. The antenna coil 4 is secured to the antenna cover 3 and electrically connected (e.g., by welding) to the antenna connector 31, providing signal input to the antenna coil 4.

[0046] The helical coil 2 may include one or more helical wires (such as two helical wires). When there are multiple helical wires, the multiple helical wires form a multi-helical structure. For example, the two helical wires form a double helical structure.

[0047] Compared with the traditional design, this solution adds a tunable core 5. A part of the magnetic core 51 of the tunable core 5 is located in the resonant cavity body 1 and inside the antenna coil 4. Therefore, the part of the magnetic core 51 located in the resonant cavity body 1 and the antenna coil 4 constitute an inductance system. The change in the length of the magnetic core 51 in the antenna coil 4 can cause the inductance value of the inductance system to change, and then cause the mutual inductance value between the inductance system and the spiral coil 2 to change, so that the impedance matching between the inductance system and the load system composed of the spiral coil 2 and the load (the radio frequency electrode of the ion trap) can be achieved, that is, the impedance matching between the radio frequency amplifier and the ion trap electrode can be achieved. In this way, by adjusting the length of the magnetic core 51 located in the resonant cavity body 1 through the adjustment device 52, the length of the magnetic core 51 inserted into the antenna coil 4 can be adjusted, that is, fine tuning of the spiral resonator can be achieved, and then fine adjustment of the impedance matching can be achieved.

[0048] Alternatively, the antenna coil 4 can be called the first coil and the helical coil 2 can be called the second coil. Both the first coil and the second coil are helical. The first coil is used to input antenna signals, and the second coil is used to connect to a load (RF electrode of the ion trap).

[0049] In an exemplary embodiment, the adjustment device 52 is at least partially located outside the resonant cavity body 1 .

[0050] In this way, the length of the magnetic core 51 inserted into the antenna coil 4 can be adjusted by the adjusting device 52 without opening the antenna cover 3, thereby achieving fine tuning of the helical resonator.

[0051] Alternatively, the adjustment device 52 may be partially located within the resonant cavity body 1 and partially located outside the resonant cavity body 1. The portion of the adjustment device 52 located within the resonant cavity body 1 is also inserted into the antenna coil 4 and is fixedly connected to the portion of the magnetic core 51 inserted into the antenna coil 4. The portion of the adjustment device 52 located outside the resonant cavity body 1 is responsible for implementing the adjustment function. By driving the portion of the adjustment device 52 located within the resonant cavity body 1 to move along the axial direction of the antenna coil 4, the portion of the adjustment device 52 located within the resonant cavity body 1 drives the magnetic core 51 to move along the axial direction of the antenna coil 4, thereby achieving length adjustment of the magnetic core 51 inserted into the resonant cavity body 1.

[0052] Alternatively, the adjustment device 52 may be entirely located outside the resonant cavity body 1. The adjustment device 52 is fixedly connected to the portion of the magnetic core 51 located outside the resonant cavity body 1, and by driving the portion of the magnetic core 51 located outside the resonant cavity body 1 to move along the axial direction of the antenna coil 4, the length of the magnetic core 51 inserted into the resonant cavity body 1 can be adjusted.

[0053] Of course, the adjustment device 52 can also be located entirely inside the resonant cavity body 1, as long as it can achieve length adjustment of the magnetic core 51 inserted into the resonant cavity body 1, thereby achieving fine adjustment of the impedance matching.

[0054] In an exemplary embodiment, the adjustment device 52 includes a threaded adjustment member. The threaded adjustment member is threadedly connected to the antenna cover 3 and fixedly connected to the magnetic core 51. The threaded adjustment member is configured to rotate relative to the antenna cover 3 to drive the magnetic core 51 to move axially relative to the antenna cover 3 along the antenna coil 4.

[0055] The threaded adjustment member can be a screw, bolt, or other component. The threaded adjustment member and magnetic core 51 can be fixedly connected by welding or other methods. During fine tuning, by rotating the threaded adjustment member, the threaded adjustment member can be moved axially relative to the cover plate along the antenna coil 4, thereby driving the magnetic core 51 to move axially along the antenna coil 4, achieving fine adjustment of impedance matching.

[0056] The thread pitch of the threaded adjustment element can be designed to be smaller. For example, fine-thread screws can be used. This results in relatively small axial displacement per rotation of the threaded adjustment element, facilitating more refined inductance adjustment of the inductor system and, in turn, impedance matching.

[0057] In an exemplary embodiment, the adjusting device 52 includes a micrometer head, which includes an adjusting structure and a micrometer screw, and the micrometer screw is fixedly connected to the magnetic core 51; the adjusting structure is connected to the micrometer screw, and is configured to drive the micrometer screw to move axially along the antenna coil 4, so as to drive the magnetic core 51 to move axially along the antenna coil 4 relative to the antenna cover 3.

[0058] One end of the micrometer screw is located inside the resonant cavity body 1 and is fixedly connected to the magnetic core 51 , and the adjustment structure is located outside the resonant cavity body 1 and is connected to the micrometer screw.

[0059] The micrometer screw can be fixedly connected to the magnetic core 51 by welding or other methods, and the micrometer screw can be threadedly connected to the antenna cover 3. The adjustment structure can include a rotatable adjustment block or other structures, such as a rotating disk with a relatively large diameter.

[0060] The micrometer head can use the screw pair principle or the linear displacement sensor technology to read the axial movement distance of the micrometer screw, which is also conducive to the refinement of the inductance value adjustment of the inductance system, and further conducive to the refinement of the impedance matching adjustment.

[0061] In an exemplary embodiment, the adjustment device 52 includes a piezoelectric ceramic, one end of which is fixed to the antenna cover 3, and the other end of the piezoelectric ceramic is fixedly connected to the magnetic core 51. The piezoelectric ceramic is configured to change the voltage to change the length of the piezoelectric ceramic, thereby driving the magnetic core 51 to move axially relative to the antenna cover 3 along the antenna coil 4.

[0062] The length of the piezoelectric ceramic can be varied by applying a voltage. Therefore, by varying the voltage applied to the piezoelectric ceramic, the length of the piezoelectric ceramic along the axial direction of the antenna coil 4 can be varied, thereby driving the magnetic core 51 to move axially along the antenna coil 4, achieving fine adjustment of the impedance matching. Changing the piezoelectric ceramic voltage allows for finer adjustment, thus facilitating finer adjustment of the inductance value of the inductive system, and thus, finer adjustment of the impedance matching.

[0063] The piezoelectric ceramic can be fixedly connected to the magnetic core 51 and the antenna cover 3 by bonding or other methods.

[0064] The piezoelectric ceramics can be entirely located outside the resonant cavity body 1, in which case the end of the piezoelectric ceramics close to the antenna coil 4 is fixedly connected to the antenna cover 3, and the end of the piezoelectric ceramics away from the antenna coil 4 is fixedly connected to the portion of the magnetic core 51 located outside the resonant cavity body 1. The piezoelectric ceramics can also be entirely located inside the resonant cavity body 1, in which case the end of the piezoelectric ceramics away from the spiral coil 2 is fixedly connected to the antenna cover 3, and the end of the piezoelectric ceramics close to the spiral coil 2 is fixedly connected to the portion of the magnetic core 51 located inside the resonant cavity body 1.

[0065] Of course, the piezoelectric ceramics may be partially located outside the resonant cavity body 1 and partially located inside the resonant cavity body 1 .

[0066] In an exemplary embodiment, the outer side wall of the resonant cavity body 1 includes a first side wall, the first side wall is provided with a radio frequency connector, and the first side wall is arranged to be planar.

[0067] In conventional designs, the resonant cavity body 1 ′ is cylindrical in shape, so the radio frequency connector can only be fixed with screws, which may cause the screws to become loose and the electrical contact to be poor.

[0068] In this solution, the first side wall where the RF connector is provided is a planar structure, and thus can be fixed by welding or other methods, which helps to avoid loosening of the RF connector and poor electrical contact.

[0069] The first side wall may be the top wall of the outer side wall of the spiral resonator. The number of RF connectors may be multiple, such as including an RF input connector 11 and an RF output connector 12. The RF input connector 11 is electrically connected to the input end of the spiral coil 2, such as by welding.

[0070] In an exemplary embodiment, the outer side wall of the resonant cavity body 1 includes a second side wall, which is arranged to be planar and fixedly connected to the base to fix the helical resonator to the base.

[0071] In conventional designs, the resonant cavity body 1 ′ is a cylindrical structure, and is generally fixed by a clamp, which makes the resonant cavity body 1 ′ easily deformed.

[0072] In this solution, the second side wall of the resonant cavity body 1 is set to be flat, which is convenient for setting structures such as threaded holes, and thus the resonant cavity body 1 can be easily fixed on the base without using a clamp to fix the resonant cavity body 1, thereby avoiding deformation of the resonant cavity body 1.

[0073] The second sidewall may be a bottom wall of an outer sidewall of the spiral resonator.

[0074] In an exemplary embodiment, the outer wall of the resonant cavity body 1 is in the shape of a rectangular parallelepiped, such as Figure 4 shown.

[0075] In other words, the exterior of the resonant cavity body 1 is generally rectangular, making it easy to install structures such as RF connectors, secure the resonant cavity body 1, and add temperature control devices such as semiconductor cooling fins. The interior of the resonant cavity body 1 is cylindrical, realizing the function of a spiral resonant cavity.

[0076] In an exemplary embodiment, the helical resonator further includes an end cap 6 and an electrical feedthrough shield 7, such as Figure 4 and Figure 5 As shown, end cap 6 is mounted on the end of resonant cavity body 1 away from antenna cover 3. The output end of helical coil 2 extends through end cap 6 to a vacuum feedthrough for connection to the ion trap RF electrode. Feedthrough shield 7 is connected to end cap 6 and is positioned to cover the vacuum feedthrough.

[0077] The end cap 6 also forms part of the outer shell of the helical resonator. The feedthrough shield 7 matches the size of the vacuum feedthrough and can cover the feedthrough connection to reduce energy attenuation caused by electromagnetic radiation.

[0078] In an exemplary embodiment, Figure 5 As shown, the helical resonator further includes: a first insulating bracket 91 , which is provided in the resonant cavity body 1 and is configured to fix the main body of the helical coil 2 .

[0079] The helical coil 2 can include an input connector, a main body, and an output connector. The main body is helical, and the input and output connectors can be linear. The input connector is electrically connected to the RF input connector 11, and the output connector extends through the end cap 6 to a vacuum feedthrough for electrical connection to the RF electrode of the ion trap.

[0080] The first insulating bracket 91 can fix the main body of the spiral coil 2, effectively reducing the shaking of the spiral coil 2 caused by vibration, and improving the stability of the spiral resonant cavity.

[0081] In an exemplary embodiment, the first insulating support 91 includes: a plurality of sub-supports spaced apart along the circumference of the spiral coil 2, such as Figure 5 The sub-bracket is provided with a spiral groove corresponding to the spiral coil 2, and the spiral coil 2 is partially embedded in the spiral groove.

[0082] In this way, the multiple sub-supports can better fix the main part of the spiral coil 2, have good fixation reliability, and can limit the pitch of the spiral coil 2.

[0083] In an exemplary embodiment, the helical resonator further includes a second insulating support 92, such as Figure 5 As shown, it is arranged in the resonant cavity body 1 and is configured as an output connector for fixing the spiral coil 2.

[0084] In this way, the second insulating bracket 92 can better fix the output end of the spiral coil 2. The second insulating bracket 92 can be fixed to the end cover 6.

[0085] In an exemplary embodiment, the helical resonator further includes: a third insulating support 93, such as Figure 5 As shown, it is arranged in the resonant cavity body 1 and fixedly connected to the antenna cover 3, and the antenna coil 4 is sleeved on the third insulating bracket 93.

[0086] The third insulating bracket 93 can fix the antenna coil 4, effectively reducing the shaking of the antenna coil 4 caused by vibration, and improving the stability of the spiral resonant cavity.

[0087] The third insulating support 93 may be cylindrical.

[0088] In an exemplary embodiment, the antenna cover 3 is detachably connected to the resonant cavity body 1 .

[0089] In this way, the antenna coil 4 can be separated from the resonant cavity body 1, making it easy to disassemble and adjust the pitch of the antenna coil 4. During specific tuning, the antenna cover 3 can be opened and the pitch of the antenna coil 4 can be adjusted to a rough level close to impedance matching. Then, by fine-tuning the position of the magnetic core 51, the mutual inductance between the spiral coil 2 and the antenna coil 4 changes, thereby achieving impedance matching. In this way, in the face of impedance mismatch caused by factors such as temperature changes, impedance matching can be re-achieved by adjusting only the magnetic core 51 without adjusting the antenna coil 4.

[0090] The size of the antenna cover 3 can be larger than the end of the resonant cavity body 1 to facilitate the disassembly of the antenna cover 3.

[0091] An embodiment and working principle are described below with reference to the accompanying drawings.

[0092] The spiral resonator includes a resonant cavity body 1 made of copper, a spiral coil 2 (including one or two spiral wires), an antenna coil 4 (including a wound antenna), several insulating brackets, and several radio frequency connectors. The spiral resonator is connected to the ion trap radio frequency electrode in the vacuum chamber through a vacuum electrical feedthrough. The spiral resonator and the ion trap form an impedance matching network, which is equivalent to a 50-ohm load, so that the energy output by the amplifier can be transmitted to the spiral resonant cavity and the ion trap radio frequency electrode. After passing through the amplifier, the radio frequency signal is input through the antenna coil 4. Energy is transmitted between the antenna coil 4 and the spiral coil 2 by mutual inductance. After passing through the spiral resonator, the radio frequency voltage on the radio frequency electrode is amplified again, reaching a voltage (amplitude) of hundreds to thousands of volts, thereby obtaining an electric potential field for trapped ions.

[0093] Furthermore, the tunable core 5 added in this solution can achieve precise adjustment of impedance matching by adjusting the length of the magnetic core 51 inside the antenna. The resonant cavity body 1 adopts a rectangular outer structure, with a rectangular outer portion and a cylindrical inner portion.

[0094] Figure 4 This is a schematic diagram of the appearance of the spiral resonator of this embodiment. The resonant cavity body 1 is a hollow rectangular copper block, the hollow part of which is a cylindrical structure. Its rectangular shell can provide a stable planar fixed structure. The RF connector is connected to the body through a plane, and the bottom can be drilled with threads for fixing to the base without the need for a clamp.

[0095] The magnetic core 51 is coaxially arranged with the antenna coil 4, and the position of the magnetic core 51 can be adjusted without opening the antenna cover 3. The position of the magnetic core 51 can be adjusted using screws, a micrometer, or piezoelectric ceramics. For example, the adjustment device 52 can be a micrometer fixed to the antenna cover 3, with one end of the micrometer metal rod (i.e., the micrometer screw) placed inside the antenna coil 4, and one end of the micrometer adjustment structure placed outside the resonant cavity body 1. By adjusting the micrometer adjustment structure, the depth of the micrometer metal rod inside the antenna coil 4 can be adjusted, thereby achieving fine adjustment of the impedance matching.

[0096] Attachment Figure 5 The figure is a schematic cross-sectional view of the helical resonator of this embodiment. The helical coil 2 is positioned within the resonant cavity body 1, with its pitch defined by a first insulating bracket 91. One end is welded to the RF connector on the resonant cavity body 1 to provide electrical input. The other end is a bare copper wire, secured to the resonant cavity body 1 via a second insulating bracket 92 for connection to a vacuum feedthrough. An additional feedthrough shield 7, matching the feedthrough dimensions, is provided to cover the feedthrough connection and reduce energy attenuation caused by electromagnetic radiation. The antenna coil 4 is wound with enameled wire and secured to the input side of the helical coil 2 via a third insulating bracket 93. It is also secured to the antenna cover 3. The antenna cover 3 is detachably connected to the resonant cavity body 1, allowing for easy removal and adjustment of the antenna coil 4's pitch. The magnetic core 51 is mounted on the antenna cover 3, coaxially with the antenna coil 4. The position of the magnetic core 51 can be adjusted using fine-thread screws or a micrometer, allowing for fine adjustments without opening the antenna cover 3.

[0097] Therefore, this embodiment has the following beneficial effects: more reasonable brackets are used in the mechanical structure, which can effectively reduce the problem of shaking of the antenna coil 4 and the spiral coil 2 caused by vibration, so that the spiral resonant cavity is more stable; the rectangular shell provides a more convenient fixing structure, and is convenient for adding temperature control equipment such as semiconductor refrigeration plates; the pitch of the antenna coil 4 can be roughly adjusted to near impedance matching by opening the antenna cover 3, and then the position of the magnetic core 51 in the antenna coil 4 can be fine-tuned so that the mutual inductance between the spiral coil 2 and the antenna coil 4 will also change, thereby achieving impedance matching. In the face of impedance mismatch caused by factors such as temperature changes, there is no need to adjust the pitch of the antenna coil 4, and only the adjustable battery core 5 needs to be adjusted to re-achieve impedance matching.

[0098] In the description of the present invention, it should be noted that the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "side", "relative", "four corners", "periphery", ""mouth"-shaped structure", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the structure referred to has a specific orientation, is constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0099] In the description of the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "connection," "direct connection," "indirect connection," "fixed connection," "installation," and "assembly" should be understood in a broad sense. For example, they may refer to a fixed connection, a detachable connection, or an integral connection. The terms "installation," "connection," and "fixed connection" may refer to a direct connection, an indirect connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0100] Although the embodiments disclosed herein are as described above, the contents described herein are merely embodiments for facilitating understanding of the present invention and are not intended to limit the present invention. Any person skilled in the art may make any modifications and variations in the form and details of the embodiments without departing from the spirit and scope of the present invention. However, the scope of patent protection of the present invention shall still be defined by the appended claims.

Claims

1. A spiral resonator, characterized in that: include: A resonant cavity body, wherein the interior of the resonant cavity body is a cylindrical hollow structure; a spiral coil disposed in the resonant cavity body, the spiral coil comprising at least one spiral wire; an antenna cover plate, covering one end of the resonant cavity body; an antenna coil fixed to the antenna cover, located in the resonant cavity body, and coaxially arranged opposite to the helical coil; and The tunable battery core includes an adjustment device and a magnetic core, wherein the magnetic core is installed on the antenna cover and is partially located in the resonant cavity body; the antenna coil is sleeved on the outside of the magnetic core and coaxially arranged with the magnetic core; the magnetic core is inserted into the antenna cover and movably connected to the antenna cover; the adjustment device is connected to the magnetic core and is configured to drive the magnetic core to move axially relative to the antenna cover along the antenna coil to adjust the length of the magnetic core in the resonant cavity body.

2. The helical resonator according to claim 1, wherein The adjustment device is at least partially located outside the resonant cavity body.

3. The helical resonator according to claim 2, wherein: The regulating device comprises: A threaded adjustment member is threadedly connected to the antenna cover and fixedly connected to the magnetic core. The threaded adjustment member is configured to rotate relative to the antenna cover to drive the magnetic core to move axially relative to the antenna cover along the antenna coil.

4. The helical resonator according to claim 2, wherein The adjusting device includes a micrometer head, which includes an adjusting structure and a micrometer screw, and the micrometer screw is fixedly connected to the magnetic core; the adjusting structure is connected to the micrometer screw and is configured to drive the micrometer screw to move axially along the antenna coil to drive the magnetic core to move axially along the antenna coil relative to the antenna cover.

5. The helical resonator according to claim 4, characterized in that One end of the micrometer screw is located inside the resonant cavity body and fixedly connected to the magnetic core, and the adjustment structure is located outside the resonant cavity body and connected to the micrometer screw.

6. The helical resonator according to claim 1, wherein The adjusting device includes a piezoelectric ceramic, one end of which is fixed to the antenna cover, and the other end of which is fixedly connected to the magnetic core. The piezoelectric ceramic is configured to change the voltage to change the length of the piezoelectric ceramic, thereby driving the magnetic core to move axially relative to the antenna cover along the antenna coil.

7. The helical resonator according to any one of claims 1 to 6, characterized in that The outer side wall of the resonant cavity body includes a first side wall, the first side wall is provided with a radio frequency connector, and the first side wall is configured to be planar; and / or The outer side wall of the resonant cavity body includes a second side wall. The second side wall is arranged in a planar shape. The second side wall is arranged to be fixedly connected to the base to fix the helical resonator to the base.

8. The helical resonator according to claim 7, wherein The outer wall of the resonant cavity body is in a rectangular parallelepiped shape.

9. The helical resonator according to any one of claims 1 to 6, characterized in that Also includes: an end cap, which is provided at one end of the resonant cavity body away from the antenna cover, and wherein the output end of the spiral coil extends through the end cap to a vacuum electrical feedthrough to be connected to a radio frequency electrode of the ion trap; and The electric feedthrough shielding cover is connected to the end cover and is configured to cover the vacuum electric feedthrough.

10. The helical resonator according to any one of claims 1 to 6, characterized in that Also includes: The first insulating bracket is arranged in the resonant cavity body and is configured to fix the main body of the spiral coil.

11. The helical resonator according to claim 10, wherein The first insulating support comprises: A plurality of sub-supports are arranged at intervals along the circumference of the spiral coil. The sub-supports are provided with spiral grooves corresponding to the spiral coils, and the spiral coils are partially embedded in the spiral grooves.

12. The helical resonator according to any one of claims 1 to 6, characterized in that Also includes: a second insulating bracket, disposed in the resonant cavity body and configured to fix the output connector of the spiral coil; and / or The third insulating bracket is arranged in the resonant cavity body and is fixedly connected to the antenna cover. The antenna coil is sleeved on the third insulating bracket.

13. The helical resonator according to any one of claims 1 to 6, characterized in that The antenna cover is detachably connected to the resonant cavity body.

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