Ion trap device

Abstract

According to the technical scheme, the ion trap device comprises an ion trap, the ion trap comprises an even number of alternating current electrodes, each alternating current electrode is in a sheet shape and extends along a central shaft, and all the alternating current electrodes are oppositely arranged in pairs with the central shaft as the axis; the direct-current electrodes extend along the central shaft, every two direct-current electrodes are oppositely arranged with the central shaft as the axis, and the oppositely arranged direct-current electrodes sequentially extend along the central shaft. The alternating-current electrodes and the direct-current electrodes are alternately arranged around the central shaft in the circumferential direction, and a trapping area used for trapping charged particles is defined around the central shaft. According to the ion trap device, the direct-current electrodes are used for replacing the binding function of an original end cap electrode on charged particles, the two ends of the center shaft are not shielded, observation of the charged particles is facilitated, and fine control demonstration of the charged particles can be achieved through combined regulation and control of multiple pairs of direct-current electrodes.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of charged particle confinement device, in particular to an ion trap device. BACKGROUND

[0002] Blade ion trap is an ion trapping device based on electrostatic field and radio frequency electric field, which creates a pseudo potential well in three-dimensional space to confine charged particles in a set area. It is widely used in quantum information processing, precision spectroscopy, time frequency standard and ion trap mass spectrometry. It is a variant of Paul trap, which has advantages in electric field uniformity, processing difficulty and multi-ion control ability compared with traditional quadrupole trap.

[0003] The traditional blade ion trap applies alternating voltage to four oppositely placed metal sheet electrodes, and adds two end cap electrodes with direct current voltage at both ends of the metal sheet electrode to provide the confinement electric field. The traditional blade ion trap must add two end cap electrodes with direct current voltage at both ends of the metal sheet electrode. Although this structure is simple in design and low in manufacturing cost, the electrode is too single, which has disadvantages in ion confinement and manipulation. The gradient of the particle in the axial direction is small when it is confined, so the escape phenomenon is easy to occur. Moreover, the coupling between the radial and axial vibration modes also causes instability of particle motion. At the same time, due to the single axial electric field, it also leads to the inability to realize the motion control of the particles, and can only realize the simple confinement in the general sense. Finally, limited by the existence of end cap electrode, the laser used for imaging or other purposes cannot be incident from the axial direction, which will bring difficulties to the observation of experimental results. CONTENT OF THE INVENTION

[0004] In order to avoid the shortcomings of the traditional blade ion trap in the stability of charged particle confinement and manipulation, the present application provides an ion trap device.

[0005] The present application provides an ion trap device, which comprises an ion trap, and the ion trap comprises:

[0006] An even number of alternating current electrodes, each of which is sheet-shaped and extends along a central axis, and all of which are arranged in pairs opposite to each other with the central axis as the axis;

[0007] An even number of direct current electrodes extending along the central axis, and the direct current electrodes are arranged in pairs opposite to each other with the central axis as the axis, and the opposite direct current electrodes extend along the central axis in sequence.

[0008] The alternating current electrodes and the direct current electrodes are alternately arranged around the central axis, and a confinement area for confining charged particles is defined around the central axis.

[0009] Preferably, the direct current electrodes extending along the central axis extend in the same plane.

[0010] Preferably, two alternating current electrodes are provided, and the alternating current electrodes are arranged on both sides of the central axis with the central axis as the axis.

[0011] Preferably, the ion trap device comprises:

[0012] The support frame and the circuit board corresponding to the direct current electrode and the alternating current electrode are provided, the direct current electrode and the alternating current electrode are conductively fixed on the corresponding circuit board, and the circuit board is fixed on the corresponding support frame.

[0013] Preferably, the ion trap device comprises:

[0014] The support frame is provided with a mounting groove on the surface, and the depth of the mounting groove is at least not less than the depth of the direct current electrode and / or the alternating current electrode; the circuit board is fixed on the surface of the support frame with the mounting groove, and the direct current electrode and / or the alternating current electrode are accommodated in the mounting groove.

[0015] Preferably, the ion trap device comprises:

[0016] A light source, the light emitted by the light source penetrating the trapping area;

[0017] An image acquisition device, the image acquisition device acquiring images at the trapping area through the circumferential gap between the direct current electrode and the alternating current electrode.

[0018] Preferably, the image acquisition device is movably arranged along the extension direction of the central axis.

[0019] Preferably, the ion trap device comprises a slide rail extending along the central axis, and the image acquisition device is movably arranged on the slide rail.

[0020] Preferably, the light source is a parallel light source, and emits parallel light irradiating along the central axis.

[0021] The ion trap device of the present application uses a direct current electrode to replace the original end cap electrode pair to confine the charged particles, not only eliminating the shielding at both ends of the central axis to facilitate the observation of the charged particles, but also enabling fine control and demonstration of the charged particles through the combination of multiple pairs of direct current electrodes. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 FIG. 1 is a schematic view of the ion trap 11 in the ion trap device of the present application;

[0023] Figure 2 FIG. 2 is a schematic view of the structure of the ion trap 11 in FIG. 1; Figure 3 Figure 1 FIG. 3 is a schematic view of the structure of the ion trap 11 in FIG. 1;

[0024] Figure 4 FIG. 4 is a schematic view of the direct current electrode 12 fixed to the support frame 16 in the ion trap 11 of the present application;

[0025] FIG. 5 is a schematic view of the direct current electrode 12 fixed to the support frame 16 in the ion trap 11 of the present application.Figure 5 Figure 1 is a schematic diagram of the overall structure of the ion trap device 1 of the present application.

[0026] In the figure:

[0027] 1: ion trap device; 11: ion trap; 12: DC electrode; 13: AC electrode; 14: trapping region; 15: central axis; 16: support frame; 161: mounting slot; 17: circuit board; 2: light source; 3: image acquisition device; 31: slide rail. DETAILED DESCRIPTION

[0028] The technical solutions of the present application are described in detail below in combination with the drawings and specific embodiments. In the present specification, the sizes of the drawings do not represent actual size ratios, and the drawings are only used to reflect the relative positional relationships and connection relationships between the components. Components with the same names or the same reference numerals represent similar or identical structures, and are only for illustrative purposes.

[0029] Figure 1 Figure 1 is a schematic diagram of the structure of the ion trap device 1 of the present application, which includes an ion trap 11. The ion trap device 1 has an even number of sheet-shaped AC electrodes 13 extending along a central axis 15, and the AC electrodes 13 are arranged opposite to each other with the central axis 15 as the axis. The ion trap device 1 also has an even number of DC electrodes 12 extending along the central axis 15, and the DC electrodes 12 are arranged opposite to each other with the central axis 15 as the axis. Moreover, the oppositely arranged DC electrodes 12 extend along the central axis 15 in sequence. Generally, the DC electrodes 12 extending along the central axis 12 are arranged to extend in the same plane. In this case, a trapping region 14 extending along the central axis 15 is enclosed by the ion trap 11 and the DC electrodes 12. Under the action of an external electric field on the DC electrodes 12 and the AC electrodes 13, charged particles can be stably trapped in the trapping region 14.

[0030] As Figure 2The schematic diagram shown is one embodiment. It has two sheet-shaped alternating current electrodes 13 extending along the central axis 15, and the two alternating current electrodes 13 are oppositely arranged on both sides of the central axis 15 with the central axis 15 as the axis, and it also has a plurality of sheet-shaped direct current electrodes 12 extending along the central axis 15, and the direct current electrodes 12 are oppositely arranged two by two with the central axis 15 as the axis, and the two oppositely arranged electrodes gradually extend along the extension direction of the central axis 15, and a small gap along the central axis 15 is generally arranged between each two oppositely arranged electrodes. As shown in the figure, the alternating current electrodes 13 and all the direct current electrodes 12 are circumferentially alternately arranged around the central axis 15. Due to the existence of the distance between the two oppositely arranged alternating current electrodes 13 and the existence of the relative electric machine between the two oppositely arranged direct current electrodes 12, a trapping area 14 for trapping charged particles is formed around the central axis 15 surrounded thereby. Through the alternating radio frequency electric field between the alternating current electrodes 13 and the direct current electric field applied between the direct current electrodes 12, on the one hand, the confinement of charged particles is realized, and on the other hand, the fine control demonstration of charged particles is realized.

[0031] Figure 2 and Figure 3 for Figure 1 The structural schematic diagram of the ion trap 11 in the figure. The ion trap 11 also includes a plurality of support frames 16 for fixing the direct current electrodes 12 and the alternating current electrodes 13. The support frames 16 are fixed to the fixed plates at both ends along the direction of the central axis 15, and the direct current electrodes 12 or 13 are fixed to the support frames 16 to realize the pose fixing of the direct current electrodes 12 or 13 relative to the central axis 15. The direct current electrodes 12 or the alternating current electrodes 13 are conductively fixed to the circuit board 17 by welding or other processes, and then the circuit board 17 is fixed to the surface of the support frame 16. In order to ensure the reliability of this connection and the stability of the direct current electrodes 12 or the alternating current electrodes 13, the direct current electrodes 12 or the alternating current electrodes 13 are usually placed between the support frame 16 and the circuit board 17.

[0032] Figure 4The schematic diagram of fixing the DC electrodes 12 to the support frame 16. The surface of the support frame 16 for fixing the circuit board 17 is provided with mounting slots 161 for accommodating the DC electrodes 12 or AC electrodes 13, the depth of the mounting slots 161 is at least not less than the depth of the DC electrodes 12 or AC electrodes 13, the surface of the circuit board 17 fixed to the support frame 16 with the mounting slots 161 is fixed, such as glued. The DC electrodes 12 or AC electrodes 13 are welded to the surface of the circuit board 17 and conductively connected with the circuit on the circuit board 17, the DC electrodes 12 or AC electrodes 13 are simultaneously accommodated in the mounting slots 161, which not only makes the exposed surface of the device more simple, but on the other hand mainly protects the DC electrodes 12 or AC electrodes 13 from the environment, ensures the stability of the installation of the DC electrodes 12 or AC electrodes 13. Especially when installing the DC electrodes 12, this helps to avoid the problem of conductive particles embedding into the micro gap between the DC electrodes 12, causing short circuit between different DC electrodes 12.

[0033] Figure 5 The schematic diagram of the overall structure of the ion trap device 1. It also includes a light source 2 and an image acquisition device 3. The light source 2 is arranged on one side of the ion trap 11 along the central axis 15 and emits light along the central axis 15, which means that the emitted light will penetrate the aforementioned trapping area 14. The light source 2 is usually a parallel light source to provide light through the trapping area 14. It can be visible light, more commonly set as a certain power of laser. The image acquisition device 3 is arranged on one side of the ion trap 11, and the image acquisition device 3 acquires the image of the trapping area 14 through the circumferential gap between the DC electrodes 12 and the AC electrodes 13. Preferably, the image acquisition device 3 can be considered to be arranged to move along the central axis 15, in order to achieve this, the image acquisition device 3 is movably arranged on the slide rail 31 extending along the central axis 15. The reason why it is recommended to move the image acquisition device 3 along the central axis 15 is mainly in the case of limited field of view of the image acquisition device 3, by moving the position of the image acquisition device 3 to achieve the task of shooting the entire trapping area 14 along the central axis 15.

[0034] In use, the charged particles are shaken in the trapping area 14, and the charged particles are captured by adjusting the DC signals applied to each pair of DC electrodes 12 along the central axis 15 and the AC signals applied to the AC electrodes 13, so that the charged particles are suspended in the trapping area 14. At this time, the light emitted by the light source 2 axially into the trapping area 14 will occur after irradiating the charged particles, the light is scattered to all directions, and there is scattered light entering the image acquisition device 3, so that the image captured by the image acquisition device 3 can significantly distinguish the image of the charged particles, identify the position and motion state of the charged particles.

[0035] The above merely describes the preferred embodiments of the present application, and is not intended to limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those of ordinary skill in the art shall fall within the protection scope of the present application as defined by the claims.

Claims

1. An ion-trap device, characterized by The ion trap (11) comprises: An even number of alternating current electrodes (13), each of which extends along a central axis (15) in the form of a sheet, and all of which are arranged opposite to each other around the central axis (15); An even number of direct current electrodes (12) extending along the central axis (15), and arranged opposite to each other around the central axis (15), and sequentially extending along the central axis (15); The alternating current electrodes (13) and the direct current electrodes (12) are alternately arranged around the central axis (15) to define a trapping area (14) around the central axis (15) for trapping charged particles.

2. The ion trap device of claim 1, wherein, The direct current electrodes (12) extending along the central axis (15) extend in the same plane.

3. The ion-trap device of claim 1, wherein the first and second electrodes are configured to form a first ion-trap region and a second ion-trap region. There are two alternating current electrodes (13) arranged opposite to each other on both sides of the central axis (15) around the central axis (15). ​ 4. The ion trap device of claim 1, wherein, It comprises: Support frames (16) and circuit boards (17) corresponding to the direct current electrodes (12) and the alternating current electrodes (13), the direct current electrodes (12) and the alternating current electrodes (13) being conductively fixed on the corresponding circuit boards (17), and the circuit boards (17) being fixed on the corresponding support frames (16).

5. The ion-trap device of claim 4, wherein, It comprises: The support frames (16) have mounting grooves (161) on their surfaces, and the depth of the mounting grooves (161) is at least not less than the depth of the direct current electrodes (12) and / or the alternating current electrodes (13); the circuit boards (17) are fixed on the surfaces of the support frames (16) having the mounting grooves (161), and the direct current electrodes (12) and / or the alternating current electrodes (13) are accommodated in the mounting grooves (161).

6. The ion trap device of claim 1, wherein, It comprises: A light source (2) that emits light that penetrates the trapping area (14); An image acquisition device (3) that acquires images of the trapping area (14) through the circumferential gap between the direct current electrodes (12) and the alternating current electrodes (13).

7. The ion-trap device of claim 6, wherein, The image acquisition device (3) is movably arranged along the extension direction of the central axis (15).

8. The ion-trap device of claim 7, wherein, There is a slide rail (31) extending along the central axis (15), and the image acquisition device (3) is movably arranged on the slide rail (31).

9. The ion-trap device of claim 8, wherein, The light source (2) is a parallel light source that emits parallel light along the central axis (15).

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