A guided electric field power supply device based on series-parallel hybrid

Abstract

The present invention discloses a guide electric field power supply device based on a series-parallel hybrid, which belongs to the field of electron ion optical equipment. It includes an upper electrode plate, a lower electrode plate and padding plates symmetrically and equidistantly distributed between the upper and lower electrodes. The upper and lower electrodes are used to form a downward guide electric field, and the padding plates are used for edge shaping. Each electrode plate is installed and positioned through an insulating plate on the back, wherein each pair of padding plates is connected by a metal copper strip installed on the insulating plate, and a signal collector is installed behind the insulating plate of the lower electrode plate. The upper electrode plate and the padding plate adjacent to the upper electrode plate are powered by series voltage division through resistors of the same resistance value, and the remaining electrodes and signal collectors are independently powered, which reduces the number of electrode paths and simplifies the internal structure of the detector while ensuring accurate voltage modulation of important electrodes. By independently adjusting the potential of the lower electrode plate and the signal collector, the focusing and defocusing of the collected particles can be controlled, and the lateral drift during the positive ion collection process can be reduced.

Description

Technical Field

[0001] The present invention relates to the field of electron ion optical equipment, and more particularly to a guided electric field power supply device based on series-parallel hybrid. Background Art

[0002] In recent years, residual gas ionization chambers based on the principle of electromagnetic induction are inductive, non-intercepting detectors. They have been widely used in various accelerator facilities because they can perform online, real-time measurements of the beam without deteriorating beam parameters. It is worth noting that the active medium of the residual gas ionization chamber is the residual gas in the vacuum tube, so the signal particle gain generated by the interaction between the beam and the medium is extremely low, which poses a great challenge to the collection of signal particles and the restoration of the beam profile. The guide electric field is an important factor affecting the lateral deviation in the signal particle collection process. Its electric field distribution determines the error in beam profile restoration. Therefore, the power supply and shaping scheme of the guide electric field has become a research hotspot for residual gas ionization chambers.

[0003] Among the currently mainstream guided electric field power supply and shaping solutions, independent power supply for each electrode can achieve real-time, precise modulation and remote control of each voltage level, but this reduces detector space and brings problems such as increased cost, complex operation, and high insulation requirements. Meanwhile, series power supply cannot achieve precise modulation of each electrode voltage and is not conducive to electric field shaping. Therefore, both of these solutions have, to a certain extent, limited the development of residual gas ionization chambers towards compact, bidirectional cross-section detection. Summary of the Invention

[0004] In view of the defects of the prior art, the purpose of the present invention is to provide a guided electric field power supply device based on a series-parallel hybrid, aiming to solve the problem of choosing between the advantages and disadvantages of independent power supply and series power supply in the current residual gas ionization chamber guided electric field power supply and shaping scheme, thereby reducing costs, insulation requirements and operational complexity while meeting the ability to remotely modulate and shape the guided electric field.

[0005] To achieve the above-mentioned objectives, the present invention provides a guided electric field power supply device based on a series-parallel hybrid, comprising an upper insulating plate, a lower insulating plate, an upper electrode plate, a lower electrode plate, a padding electrode plate, a signal collector and a voltage divider resistor; the upper insulating plate and the lower insulating plate are respectively fixed to the upper and lower surfaces of the guided electric field power supply device and are installed in a mirror-symmetrical manner; an upper electrode plate and a lower electrode plate are arranged on the upper insulating plate and the lower insulating plate along the flight direction of the charged particle beam, 2n padding electrodes are evenly spaced and arranged between the upper electrode plate and the lower electrode plate, and the same pair of padding electrodes are connected by a metal copper strip installed on the insulating back plate. The presence of the padding electrodes can effectively shape the edge shape of the guided electric field to reduce the lateral component of the guided electric field, so that the signal particles move downward as vertically as possible; the signal collector is located on the side of the lower electrode plate; the upper electrode plate and the n-2 pairs of padding electrodes close to the upper electrode plate are connected in series with the voltage divider resistor, and the padding electrode plate close to the lower electrode plate, the lower electrode plate and the signal collector are independently insulated from each other.

[0006] During operation, the upper plate and the n-2 pairs of padding plates close to the upper plate are connected in series for voltage division and power supply through two high-voltage channels. Since the resistance values ​​of the voltage-dividing resistors connected in series are the same, the above-mentioned series-divided plates have the same potential difference ΔV; the padding plate close to the lower plate, the lower plate and the signal collector are independently powered by high-voltage channels; without causing space shortages and high insulation, the potential of key components can be independently adjusted through remote control.

[0007] The potentials of the upper plate, shim plate, and lower plate are different, decreasing by ΔV from top to bottom. This creates a uniform electric field directed vertically downward between the upper and lower plates. A charged particle beam enters the device from the front and interacts with gas molecules within the device to generate signal particles. These particles then move downward under the influence of the electric field between the upper and lower plates and are collected by the signal collector. The collected signal particles are focused and defocused by adjusting the potential between the lower plate and the signal collector.

[0008] Preferably, all the plates are metal plates.

[0009] Preferably, the resistors connected in series between the shim plates are equidistantly distributed and have equal resistance values.

[0010] Preferably, the signal collector includes three electrical connectors, each of which is independently powered.

[0011] Preferably, the number of padding plates for independent power supply close to the lower plate in the series-parallel hybrid guided electric field power supply device is m, satisfying:

[0012] m=H-6

[0013] Where H is the number of high-voltage channels.

[0014] Preferably, the lateral component of the electric field in the area between the lower plate and the signal collector is:

[0015]

[0016] Among them, d y is the vertical distance between the lower plate and the edge of the signal collector, d x is the lateral distance between the lower plate and the edge of the signal collector, V1 is the lower plate potential, and V2 is the signal collector potential. By utilizing the independent power supply function for key components, the potential between the lower plate and the signal collector is adjusted to achieve control of the collected particles' focus, thereby obtaining a collected particle image that conforms to the initial beam profile information. When V1 and V2 have different magnitudes, the aforementioned lateral components of the electric field clearly have different directions, thereby achieving control over the lateral trajectory of the signal particles and achieving the effect of controlling the focus and defocus of the signal particles.

[0017] Compared with the prior art, the above technical solutions proposed by the present invention can achieve the following:

[0018] Beneficial effects:

[0019] 1. The guided electric field power supply device based on series-parallel hybrid provided by the present invention only implements independent power supply for the multi-stage signal enhancer and the lower electrode plate close to the signal enhancer, and supplies power in series to other electrodes. The two power supply methods are used in combination, thereby achieving the shaping of the guided electric field and the collection of signal particles through fewer high-voltage power supply channels.

[0020] 2. The guided electric field power supply device based on series-parallel hybrid provided by the present invention adopts a power supply method based on large resistor series voltage division for the equally spaced padding plates and the upper plate distributed between the upper and lower plates. It can not only reduce the voltage deviation caused by the resistance deviation, but also improve the edge shape of the electric field and enhance the uniformity of the electric field.

[0021] 3. The guided electric field power supply device based on series-parallel hybrid provided by the present invention can realize the focusing and defocusing control of signal particles by changing the mutual potential between the upper electrode and the signal collector, and can weaken the influence of the lateral deviation of the signal particles by adjusting the strength of the focusing and defocusing effect, so that the profile information obtained by restoring the signal particles is more similar to the real profile of the beam, thereby inferring more accurate initial beam lateral distribution information. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of the series-parallel hybrid guided electric field power supply device provided by the present invention.

[0023] Figure 2 This is a schematic diagram of the circuit connections of each plate and signal collector.

[0024] Figure 3 This is a three-dimensional electric field equipotential line diagram under a series-parallel hybrid power supply scheme disclosed in an embodiment of the present invention. 3.A is the focused electric field, and 3.B is the defocused electric field.

[0025] Figure 4 A schematic diagram of signal particle collection simulation under a current power supply scheme disclosed in an embodiment of the present invention.

[0026] Figure 5 This is a cross-sectional view of a signal particle under a current power supply scheme disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0028] The present invention provides a guided electric field power supply device based on series-parallel hybrid, such as Figure 1 As shown, it includes an upper insulating plate, a lower insulating plate, an upper electrode plate, a lower electrode plate, a padding electrode plate, a signal collector and a voltage divider resistor; the upper insulating plate and the lower insulating plate are respectively fixed to the upper and lower surfaces of the guided electric field power supply device and are installed in a mirror-symmetrical manner; an upper electrode plate and a lower electrode plate are arranged on the upper insulating plate and the lower insulating plate along the flight direction of the charged particle beam, and 2n padding electrodes are evenly distributed and arranged between the upper electrode plate and the lower electrode plate, and the same pair of padding electrodes are connected by a metal copper strip installed on the insulating back plate. The presence of the padding electrode plate can effectively shape the edge shape of the guided electric field to reduce the lateral component of the guided electric field, so that the signal particles move downward as vertically as possible; the signal collector is located on the side of the lower electrode plate; the upper electrode plate and the n-2 pairs of padding electrodes close to the upper electrode plate are connected in series with the voltage divider resistor, and the padding electrode plate, the lower electrode plate and the signal collector close to the lower electrode plate are independently insulated from each other; the circuit connection diagram of each electrode plate and the signal collector is shown in FIG. Figure 2 shown.

[0029] During operation, the upper plate and the n-2 pairs of padding plates close to the upper plate are connected in series for voltage division and power supply through two high-voltage channels. Since the resistance values ​​of the voltage-dividing resistors connected in series are the same, the above-mentioned series-divided plates have the same potential difference ΔV; the padding plate close to the lower plate, the lower plate and the signal collector are independently powered by high-voltage channels; without causing space shortages and high insulation, the potential of key components can be independently adjusted through remote control.

[0030] In an optional embodiment, n=7, and 14 (7 pairs) padding plates are evenly spaced between the upper plate and the lower plate. The upper plate and the five pairs of padding plates adjacent to the upper plate are powered by dual-channel series voltage division through resistors of equal resistance, and the remaining two pairs of padding plates, the lower plate and the signal collector are independently powered by six multi-channels. The potentials between the upper plate, the padding plate and the lower plate are different. From top to bottom, the potential decreases by ΔV, thereby forming a vertically downward uniform electric field between the upper and lower plates. The charged particle beam enters the device from the front, interacts with the gas molecules in the device to generate signal particles, and the signal particles move downward under the action of the electric field between the upper and lower plates and are collected by the signal collector. By adjusting the potential between the lower plate and the signal collector, the focusing and defocusing of the collected signal particles can be controlled.

[0031] like Figure 3 As shown, a hybrid series-parallel power supply scheme is used to power the illustrated electric field. With the padding plate shaping the electric field edge, the electric field equipotential lines are essentially parallel within the effective area indicated by the black box, with only a noticeable deformation at the lower plate window near the signal booster. Independent power supply channels are used for the lower plate and the multi-stage signal booster to adjust the mutual potential between the two: Figure 3 3.A (A electric field) in the figure is the equipotential line diagram when the potential of the lower plate is higher than that of the signal booster. It can be seen that in this case, the electric field above the signal booster bulges upward, and the direction of the electric field strength is perpendicular to the equipotential line. Therefore, the electric field has a focusing effect on positively charged particles. Figure 3 3.B (B electric field) in the figure is the equipotential line diagram where the potential of the lower plate is lower than that of the signal booster. The equipotential lines of the electric field above the signal booster are concave downward, which has a defocusing effect on positively charged particles.

[0032] like Figure 4 As shown in the figure, after setting different potentials for the lower plate and the signal amplifier, signal particles (positive ions) are introduced to perform ion tracking simulation. The obtained particle trajectory diagram shows that: under the focusing effect of electric field A, the positive ions shrink inward relative to the vertical trajectory when approaching the signal amplifier; while under the focusing effect of electric field B, the positive ions diverge outward relative to the vertical trajectory when approaching the signal amplifier. This is consistent with the Figure 3 This is consistent with the electric field analysis results shown.

[0033] like Figure 5As shown, the signal particles are collected after being guided by the electric field, and the horizontal (X) direction profile information is restored. In the simulation result diagram, the red solid curve is the X-direction profile of the beam after the signal particles are collected under an ideal vertical electric field. The X-direction profiles of the beam obtained under the action of the A and B electric fields are the blue dotted line and the green dotted line shown in the figure respectively. It can be seen that compared with the cross-sectional size obtained under the ideal electric field, the restored cross-sectional area under the action of the A electric field is reduced, while the effect of the B electric field is the opposite. This is consistent with Figure 4 The changes in the signal particle trajectories are consistent with those shown, indicating that the current electric field structure and power supply scheme design have the function of controlling the focusing of signal particles.

[0034] It can be concluded that the series-parallel hybrid power supply method can meet the requirements of electric field uniformity while reducing costs and insulation requirements without causing space constraints in the detector. The potential of the lower plate and the signal enhancer can be adjusted to achieve focusing control of the signal particles. This allows the errors caused by initial momentum offset of particles and stray particles to be reduced in the actual application of the detector, thereby obtaining more accurate beam profile information.

[0035] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A guided electric field power supply device based on series-parallel hybrid, characterized in that: The device comprises an upper insulating plate, a lower insulating plate, an upper electrode plate, a lower electrode plate, a padding electrode plate, a signal collector, and a voltage divider resistor; the upper insulating plate and the lower insulating plate are respectively fixed to the upper and lower surfaces of the guided electric field power supply device and are installed in a mirror-symmetrical manner; the upper electrode plate and the lower electrode plate are arranged on the upper insulating plate and the lower insulating plate along the flight direction of the charged particle beam, 2n padding electrodes are evenly spaced and arranged between the upper electrode plate and the lower electrode plate, and the same pair of padding electrodes are connected by a metal copper strip installed on the insulating back plate; the signal collector is located on the side of the lower electrode plate; the upper electrode plate and n-2 pairs of padding electrodes near the upper electrode plate are connected in series with the voltage divider resistor, and the padding electrode plate near the lower electrode plate, the lower electrode plate, and the signal collector are independently insulated from each other; During operation, the upper plate and the n-2 pairs of padding plates near the upper plate are connected in series for voltage division and power supply through two high-voltage channels. Since the series-connected voltage-dividing resistors have the same resistance value, the plates in the series voltage division have the same potential difference ΔV. The padding plates near the lower plate, the lower plate, and the signal collector are independently powered by high-voltage channels. A charged particle beam enters the device from the front and reacts with the gas molecules in the device to generate signal particles. The signal particles then move downward under the action of the electric field between the upper and lower plates and are collected by the signal collector. By adjusting the potential between the lower plate and the signal collector, the focusing and defocusing of the collected signal particles can be controlled.

2. The device according to claim 1, characterized in that All plates are metal.

3. The device according to claim 1, characterized in that The resistors connected in series between the pad plates are equidistantly distributed and have equal resistance values.

4. The device according to claim 1, characterized in that The signal collector includes three electrical connectors, each of which is independently powered.

5. The device according to claim 4, characterized in that In the series-parallel hybrid guided electric field power supply device, the number of padding plates close to the lower plate for independent power supply is m, and the following conditions are satisfied: m=H-6 Where H is the number of high-voltage channels.

6. The device according to claim 1, characterized in that The lateral component of the electric field in the area between the lower plate and the signal collector is: Among them, d y is the vertical distance between the lower plate and the edge of the signal collector, d x is the lateral distance between the edge of the lower plate and the signal collector, V1 is the potential of the lower plate, and V2 is the potential of the signal collector.

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