CN114867182A - Compact electrostatic storage ring device for charged particle storage - Google Patents
Compact electrostatic storage ring device for charged particle storage Download PDFInfo
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- CN114867182A CN114867182A CN202210075584.3A CN202210075584A CN114867182A CN 114867182 A CN114867182 A CN 114867182A CN 202210075584 A CN202210075584 A CN 202210075584A CN 114867182 A CN114867182 A CN 114867182A
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- 239000007924 injection Substances 0.000 claims description 2
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- 238000000034 method Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 abstract description 2
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- 230000003287 optical effect Effects 0.000 description 5
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- 238000006243 chemical reaction Methods 0.000 description 2
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
- H05H7/06—Two-beam arrangements; Multi-beam arrangements storage rings; Electron rings
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
- H05H7/001—Arrangements for beam delivery or irradiation
Abstract
The invention discloses a compact electrostatic storage ring device for charged particle storage, which comprises four beam deflection modules, a plurality of electrostatic storage rings and a plurality of electrostatic storage rings, wherein the four beam deflection modules form a square beam flight channel; each beam deflection module comprises a beam deflection part and two beam shaping parts; each beam deflection component is composed of quadrupole deflection electrodes, and applies voltage to deflect the passing beam by 90 degrees; the four-pole deflection electrode is formed by four right-angle sector-shaped cylindrical electrodes which are back to back, square plate electrodes are arranged at the top and the bottom of each right-angle sector-shaped cylindrical electrode, an L-shaped electrode is surrounded outside each right-angle sector-shaped cylindrical electrode, and a side shielding electrode is arranged outside each L-shaped electrode; each beam shaping component is composed of an electrostatic single lens, and applies voltage to shape the beam passing through the beam deflection component. The invention has compact structure and low processing difficulty, can be used together with the femtosecond laser to make up the problem of insufficient light intensity of the femtosecond laser, and is suitable for the research of cluster deep-level full-spectrum (particle) photoelectron spectrum and dynamic process.
Description
Technical Field
The present invention relates to a storage ring device, and more particularly, to a compact electrostatic storage ring device for charged particle storage.
Background
The art of experimental physics is to observe the structure of a substance and its internal dynamics. The real-time observation (measurement) of the microscopic kinetics of the chemical reaction of the particles plays a key role in the real understanding of the nature of the chemical reaction of the particles, which can be achieved by the ultrafast laser spectrum using femtosecond lasers. However, the experimental apparatus still has many technical difficulties which cannot be solved in the architecture. The high-order frequency doubling laser generated by the femtosecond laser is suitable for researching particle micro dynamics. However, the output light flux is very small, and thus the beam intensity is very high.
The function of the storage ring is to store charged particles, i.e. to continuously inject and accumulate particles with a specific energy, to allow the stored beam to reach a nominal value and to fly in the storage ring for a long time.
If the cluster beam intensity is enhanced by repeatedly injecting beams into the storage ring, the low light intensity of the laser is compensated by the high intensity of the beams, and the problems can be solved.
An electrostatic storage ring is a small multifunctional non-relativistic particle storage ring developed at the end of the last century. The physical quantity of the operation depends only on the kinetic energy/charge ratio of the confined charged particles and not on the mass, so that the particles with large mass number, including clusters and biomacromolecules, can be stored, even the nanoparticles with larger mass number.
The electrostatic storage ring generally consists of a deflection structure and a beam shaping structure. When the quadrupole deflection electrode is used as a deflection component, a traditional symmetrical voltage is applied to the quadrupole deflection electrode, a focusing and defocusing effect is generated on the beam current, and a quadrupole third-order lens is generally arranged at an inlet and an outlet of the deflection electrode to shape the beam current. The reason is that the focusing and defocusing capabilities of the quadrupole deflection electrode in the horizontal direction and the vertical direction of the beam are different, so that the focusing and defocusing capabilities of the quadrupole deflection electrode are compensated by respectively focusing and defocusing the beam in the horizontal direction and the vertical direction by using a quadrupole rod three-lens. The symmetrical voltage mode structure is very complex, the requirement on processing precision is high, voltage parameters of the four-pole rod three-order lens are many, the adjustment is not easy, and the experimental error and difficulty are increased.
Disclosure of Invention
In order to solve the above-mentioned existing technical problems, the present invention provides a compact electrostatic storage ring device for charged particle storage, which achieves the effect that a beam enters and exits in parallel through a deflection electrode by adding a new structure on the deflection electrode and applying an asymmetric voltage, and shapes the beam by using an electrostatic single lens.
The purpose of the invention is realized by the following technical scheme.
The invention relates to a compact electrostatic storage ring device for charged particle storage, which comprises four beam deflection modules, wherein the four beam deflection modules form a square structure together to form a square beam flight channel; each beam deflection module comprises a beam deflection part and two beam shaping parts, and the included angle between the two beam shaping parts in each beam deflection module is 90 degrees and the two beam shaping parts are respectively positioned at the inlet and the outlet of the corresponding beam deflection part;
each beam deflection component consists of a quadrupole deflection electrode, and through applying proper voltage, the passing beam is deflected by 90 degrees; the quadrupole deflection electrode is formed by four right-angle fan-shaped cylindrical electrodes which are opposite, square plate electrodes are arranged at the top and the bottom of each right-angle fan-shaped cylindrical electrode to restrain longitudinal dispersion of beam current, an L-shaped electrode is arranged around the periphery of each right-angle fan-shaped cylindrical electrode, and two side shielding electrodes are arranged on the periphery of the L-shaped electrode to shield the influence of an external stray field on the beam current;
each beam shaping component is composed of an electrostatic single lens, and the beam passing through the beam deflection component is shaped by applying proper voltage.
A certain distance is reserved between adjacent beam deflection modules, and a space is reserved in advance for additionally installing a photoelectric energy spectrum electrode plate or other devices.
The quadrupole deflection electrode is in a square structure formed by surrounding four right-angle fan-shaped column electrodes, a certain distance is kept between the four right-angle fan-shaped column electrodes, each right-angle fan-shaped column electrode and the corresponding L-shaped electrode and the corresponding side shielding electrode are all kept at a certain distance, and the right-angle fan-shaped column electrodes and the corresponding L-shaped electrode and the corresponding side shielding electrodes are connected and fixed through connecting rods.
The top of each quadrupole deflection electrode is provided with a top shielding electrode, and the top shielding electrode is connected with the top of the side shielding electrode; the bottom of each quadrupole deflection electrode is provided with a bottom shielding electrode, and the bottom shielding electrode is connected with the bottom of the side shielding electrode; and each right-angle fan-shaped cylinder electrode of each quadrupole deflection electrode is fixed on the bottom shielding electrode through a square plate electrode at the bottom of the right-angle fan-shaped cylinder electrode.
The voltages applied to the quadrupole deflection electrodes adopt an asymmetric voltage mode, namely voltages with equal magnitude and same polarity are applied to opposite right-angle fan-shaped cylindrical electrodes in the quadrupole deflection electrodes, and voltages with unequal magnitude and opposite polarity are applied to adjacent right-angle fan-shaped cylindrical electrodes; and applying voltages with equal magnitude and same positive and negative to four L-shaped electrodes in the quadrupole deflection electrode.
The electrostatic single lens consists of three metal cylindrical electrodes which are coaxially arranged, a certain interval is kept between the three metal cylindrical electrodes, and the three metal cylindrical electrodes are connected through a connecting rod; the first metal cylinder electrode and the third metal cylinder electrode are the same in length and are both smaller than the second metal cylinder electrode in length.
When voltages are respectively applied to the three metal cylindrical electrodes in the electrostatic single lens, the first metal cylindrical electrode and the third metal cylindrical electrode are grounded.
And the grounding shielding tube is wrapped outside the electrostatic single lens.
The voltage applied to the beam deflection module is in a pulse form, the pulse frequency is consistent with the front-end beam injection frequency, and the voltages applied to the other three beam deflection modules are always kept constant at normal pressure.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
(1) according to the four-pole deflection electrode, the right-angle fan-shaped cylindrical electrodes are adopted, and the square plate electrodes are added at the top and the bottom of the four-pole deflection electrode, so that the divergence of beam current in the vertical direction is effectively reduced by the square plate electrodes; and an L-shaped electrode is added outside the storage ring, and successfully reduces the voltage required by deflection of the beam current by the right-angle fan-shaped cylinder electrode and stable storage of the beam current in the storage ring. And since the voltage applied to the quadrupole deflection electrodes is related to the energy of the particles (linear, positive correlation), this design enables the storage of energetic particles with lower voltages.
(2) The voltage applied to the quadrupole deflection electrode is in an asymmetric voltage mode, namely the relative electrode voltages are the same, the voltages of adjacent electrodes are different in size and opposite in positive and negative, the voltage mode can solve the problem that the focusing defocusing conditions in the horizontal direction and the vertical direction of the beam current caused by symmetric voltage are different, the purpose that the divergence degrees in the horizontal direction and the vertical direction of the beam current are the same while the beam current is deflected is achieved, and convenience is brought to subsequent beam current shaping.
(3) The beam shaping part adopts an electrostatic single lens, namely three coaxially arranged metal cylinders are used as electrodes, only the middle metal cylinder electrode needs to be powered up, and the metal cylinders on two sides are grounded; compared with a traditional four-pole three-order lens, the metal cylinder is easier to process and simpler in power-up mode. The shielding cylinder is added outside the electrostatic single lens, so that the influence of stray fields on beam current can be reduced.
Drawings
FIG. 1 is a general schematic view of a memory ring assembly of the present invention;
fig. 2 is a structural cross-sectional view of a beam deflection module according to the present invention;
FIG. 3 is a three-dimensional mechanical diagram of a right-angled sector-shaped cylindrical electrode, an "L" shaped electrode, and a side shield electrode of the present invention;
FIG. 4 is an optical approximation model of the present invention.
Reference numerals: 1-beam deflection means; 2-beam shaping means; 3-beam current; 4-right-angled sector-shaped cylindrical electrodes; 5- "L" type electrode; 6-side shield electrode; 7-an electrostatic singlet lens; 8-grounded shielding tube, 9-square plate electrode.
Detailed Description
In order to make the content of the present invention clearer, the content of the present invention is further explained below with reference to the drawings and the embodiments of the specification. The invention is not limited to this specific embodiment and general modifications and alterations known in the art are also within the scope of the invention.
As shown in fig. 1, the compact electrostatic storage ring device for storing charged particles of the present invention includes four beam deflection modules, which are respectively disposed at four corners to form a square structure together to form a square beam flight channel. Each beam deflection module comprises a beam deflection part 1 and two beam shaping parts 2, and the included angle between the two beam shaping parts 2 in each beam deflection module is 90 degrees and is respectively positioned at the inlet and the outlet of the corresponding beam deflection part 1. And a certain distance is reserved between the adjacent beam deflection modules, so that enough space is reserved in advance for additionally installing a photoelectric energy spectrum electrode plate or other devices.
Each beam deflection component 1 is composed of quadrupole deflection electrodes, and the beams passing through the beam deflection components 1 are deflected by 90 degrees by applying proper voltage. As shown in fig. 2 and fig. 3, the quadrupole deflection electrode is formed by four right-angle fan-shaped cylindrical electrodes 4 which are opposite to each other and form a square structure, a square plate electrode 9 is arranged at the top and the bottom of each right-angle fan-shaped cylindrical electrode 4, longitudinal dispersion of the beam 3 is restrained, and voltages on the square plate electrode 9 and the right-angle fan-shaped cylindrical electrode 4 are the same. The periphery of each right-angle fan-shaped cylinder electrode 4 is surrounded by an L-shaped electrode 5, and the L-shaped electrodes are used for reducing the voltage of the right-angle fan-shaped cylinder electrodes 4, deflecting the beam 3 and effectively reducing the optimized voltage for enabling the beam 3 to stably fly. Two side shielding electrodes 6 are arranged on the periphery of the L-shaped electrode 5 to shield the influence of external stray fields on the beam current 3. The top of each quadrupole deflection electrode is provided with a top shielding electrode, and the top shielding electrode is connected with the top of the side shielding electrode 6; the bottom of each quadrupole deflection electrode is provided with a bottom shielding electrode, and the bottom shielding electrode is connected with the bottom of the side shielding electrode 6; each right-angle sector-shaped cylindrical electrode 4 of each quadrupole deflection electrode is fixed on the bottom shielding electrode through a square plate electrode 9 at the bottom of the quadrupole deflection electrode, and the quadrupole deflection electrode is fixed in a space formed by the side shielding electrode 6, the top shielding electrode and the bottom shielding electrode. The right-angle sector-shaped cylinder electrode 4 can adopt a quarter-cylinder electrode, and the side shielding electrode 6, the top shielding electrode and the bottom shielding electrode can all adopt grounding plates.
Four right-angle fan-shaped column electrodes 4 in the quadrupole deflection electrode are arranged at a certain interval, and each right-angle fan-shaped column electrode 4, the corresponding L-shaped electrode 5 and the corresponding side shielding electrode 6 are arranged at a certain interval and are connected and fixed through a connecting rod. The connecting rod can be an insulating rod made of peek (polyether ether ketone), ceramic and the like, or a stainless steel rod, or a pipe externally sleeved with insulating peek and ceramic.
The voltages applied to the quadrupole deflection electrodes are not in a conventional symmetrical voltage mode (namely the relative electrode voltages are the same, and the voltages of the adjacent electrodes are equal in magnitude and opposite in polarity), but are in an asymmetrical voltage mode innovatively, namely the relative electrode voltages are the same, and the voltages of the adjacent electrodes are equal in magnitude and opposite in polarity, so that the influence of different divergence degrees of beam current in the horizontal direction and the vertical direction caused by the symmetrical voltage mode is reduced. Specifically, voltages with equal magnitude and the same polarity are applied to the opposite right-angled sectorial cylindrical electrodes 4 in the quadrupole deflection electrodes, and voltages with different magnitude and opposite polarity are applied to the adjacent right-angled sectorial cylindrical electrodes 4 in the quadrupole deflection electrodes. Further, voltages having the same magnitude and the same polarity are applied to the four "L" shaped electrodes 5 among the quadrupole deflection electrodes.
Each beam shaping component 2 is composed of an electrostatic single lens 7, and the beam passing through the beam deflection component 1 is shaped by applying proper voltage. Each beam shaping component 2 can be arranged at the central position of the side surface of the corresponding beam deflection component 1.
The electrostatic single lens 7 consists of three metal cylindrical electrodes which are coaxially arranged at equal intervals, and the three metal cylindrical electrodes keep a certain interval and are connected through a connecting rod; the first metal cylinder electrode and the third metal cylinder electrode are the same in length and are both smaller than the second metal cylinder electrode in length. In order to avoid the influence of the divergent field on the particle motion, the grounding shielding tube 8 is wrapped outside the electrostatic single lens, and the grounding shielding tube 8 is fixedly connected with the side shielding electrode 6 of the corresponding beam shaping component 2. When voltages are applied to the three metal cylindrical electrodes in the electrostatic single lens 7, the first metal cylindrical electrode and the third metal cylindrical electrode are grounded.
In addition, the voltage applied to the beam deflection module as a beam inlet is in a pulse form, so that the beam is injected into the storage ring device from the front end, and the voltages applied to the other three beam deflection modules are always kept constant at normal pressure, so that the beam can stably fly in the storage ring.
The trajectory of the charged particles in the electric field is similar to the propagation of light in an optical medium. Therefore, the stable operating state of the charged particles in the storage ring device of the present invention can be analyzed by the optical transport matrix. FIG. 4 shows an optical approximation model of the electrostatic storage ring. In this model the beam deflection unit 1 is approximated as a plane mirror, i.e. the beam 3 passes through the beam deflection unit, deflecting only 90 ° in the direction of flight, without substantial defocusing or focusing occurring in the transverse and longitudinal directions. The electrostatic single lens 7 is similar to an optical lens, and has a focusing effect on the beam current, so that the beam current can stably fly in the storage ring device. By using calculation software to calculate, when the geometric dimension is fixed, the size of the focal length of the electrostatic single lens 7 is changed, so that stable oscillation of the beam in the model can be ensured, the divergence condition can not occur, and the fact that the beam can stably fly in the storage ring in the mode is verified.
Example (b):
the compact electrostatic storage ring device for storing charged particles has the whole device occupying area of 1.5m 2 Within. The central distance between the adjacent beam deflection modules is 720mm, the minimum distance between the electrostatic single lenses 7 of the adjacent beam deflection modules is 194mm, and enough positions and spaces are reserved for electrode plates of a subsequently added photoelectron spectroscopy device or other devices.
The four-pole deflection electrode is formed by four right-angle sector-shaped cylindrical electrodes 4 with the radius of 45mm in a back-to-back mode, and the top and the bottom of each right-angle sector-shaped cylindrical electrode 4 are square plate electrodes 9 with the side length of 58mm and the thickness of 2 mm. The height of the right-angle fan-shaped cylindrical electrode 4 is 160 mm. The maximum distance between the opposing right-angled sector-shaped cylindrical electrodes 4 in the same quadrupole deflection electrode is 170 mm. The periphery of each right-angle sector-shaped column electrode 4 is surrounded by an L-shaped electrode 5 with the thickness of 6mm, the distance between the adjacent L-shaped electrodes 5 in the same beam deflection part 1 is 44mm, and the distance between the right-angle sector-shaped column electrode 4 in the same beam deflection part 1 and the corresponding L-shaped electrode 5 is 7 mm. Two side shielding electrodes 6 are arranged on the periphery of each L-shaped electrode 5, the length, width and height of each side shielding electrode 6 are 190mm, 52.5mm and 8mm, and the distance between each side shielding electrode 6 and the L-shaped electrode on the side where the side shielding electrode is located is 7 mm.
In order to satisfy the condition that the beam deflection part 1 shown in fig. 4 only has the function similar to a plane mirror, the voltage applied to the quadrupole deflection electrode adopts the mode of asymmetric voltage. In view of safety and cost, the voltage on the quadrupole deflection electrode needs to be reduced as much as possible, and the purpose of reducing the voltage on the quadrupole deflection electrode is achieved by adopting a structure of adding an L-shaped electrode 5 outside the quadrupole deflection electrode. For a particle with mass of 2000amu and energy of 100eV, the voltage of one set of opposing right-angled fan-shaped cylinder electrodes 4 in each quadrupole deflection electrode is 410V, the voltage of the other set of opposing right-angled fan-shaped cylinder electrodes 4 is-1910V, and the voltage of all "L" -shaped electrodes 5 in each beam deflection unit 1 is 700V. When the energy of the particles changes, the voltage on the electrodes changes proportionally.
The electrostatic single lens 7 is composed of three metal cylindrical electrodes which are coaxially arranged. The three metal cylindrical electrodes are all 5mm apart from each other. The first metal cylinder electrode and the third metal cylinder electrode are the same in length and are both 20mm, and the second metal cylinder electrode is longer and is 120 mm. The inner radiuses of the three metal cylindrical electrodes are 35mm, and the outer radiuses of the three metal cylindrical electrodes are 50 mm. In order to avoid the influence of the divergent field on the particle motion, the electrostatic single lens 7 is wrapped by a grounding shielding tube 8.
In order to satisfy the function of the electrostatic single lens 7 described in fig. 4 for focusing the beam 3, for a particle with a mass of 2000amu and an energy of 100eV, the voltages on the first metal cylindrical electrode and the third metal cylindrical electrode of each electrostatic single lens 7 are both zero, and the voltage applied to the second metal cylindrical electrode is 700V.
In order to ensure that charged particles can be continuously injected into the storage ring device from the front end, the beam deflection module serving as a beam inlet applies a pulse voltage to the beam deflection module, namely, each current end has a beam reaching the inlet of the storage ring, the voltage of each electrode of the beam deflection module is reduced to 0, after the beam flies into the storage ring without obstacles, the voltage of each electrode of the beam deflection module at the inlet is restored to the original value, and the voltages applied by the other three beam deflection modules are always kept constant at normal pressure.
While the present invention has been described in terms of its functions and operations with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise functions and operations described above, and that the above-described embodiments are illustrative rather than restrictive, and that various changes and modifications may be effected therein by one skilled in the art without departing from the scope or spirit of the invention as defined by the appended claims.
Claims (9)
1. A compact electrostatic storage ring device for charged particle storage is characterized by comprising four beam deflection modules, wherein the four beam deflection modules form a square structure together to form a square beam flight channel; each beam deflection module comprises a beam deflection part (1) and two beam shaping parts (2), wherein the two beam shaping parts (2) in each beam deflection module form an included angle of 90 degrees and are respectively positioned at an inlet and an outlet of the corresponding beam deflection part (1);
each beam deflection component (1) is composed of quadrupole deflection electrodes, and through applying proper voltage, the passing beams are deflected by 90 degrees; the quadrupole deflection electrode is formed by four right-angle fan-shaped cylindrical electrodes (4) which are opposite to each other, square plate electrodes (9) are arranged at the top and the bottom of each right-angle fan-shaped cylindrical electrode (4) to restrain longitudinal dispersion of beam current, an L-shaped electrode (5) is surrounded on the periphery of each right-angle fan-shaped cylindrical electrode (4), and two side shielding electrodes (6) are arranged on the periphery of the L-shaped electrode (5) to shield the influence of an external stray field on the beam current;
each beam shaping component (2) is composed of an electrostatic single lens (7), and the beam passing through the beam deflection component (1) is shaped by applying proper voltage.
2. The compact electrostatic storage ring apparatus for charged particle storage of claim 1 wherein a distance is left between adjacent beam deflection modules to allow room for additional photovoltaic electrode pads or other devices.
3. The compact electrostatic storage ring arrangement for charged particle storage according to claim 1, wherein said quadrupole deflection electrode is formed by four right-angle fan-shaped cylinder electrodes (4) in a square structure, the four right-angle fan-shaped cylinder electrodes (4) are arranged with a certain distance therebetween, and each right-angle fan-shaped cylinder electrode (4) and its corresponding "L" -shaped electrode (5) and side shielding electrode (6) are arranged with a certain distance therebetween and are connected and fixed with each other by a connecting rod.
4. Compact electrostatic storage ring arrangement for charged particle storage according to claim 1, characterized in that the top of each quadrupole deflection electrode is provided with a top shield electrode, which top shield electrode is connected with the top of a side shield electrode (6); the bottom of each quadrupole deflection electrode is provided with a bottom shielding electrode, and the bottom shielding electrode is connected with the bottom of the side shielding electrode (6); and each right-angle fan-shaped cylinder electrode (4) of each quadrupole deflection electrode is fixed on the bottom shielding electrode through a square plate electrode (9) at the bottom of the right-angle fan-shaped cylinder electrode.
5. The compact electrostatic storage ring arrangement for charged particle storage according to claim 1 wherein the voltages applied to said quadrupole deflection electrodes are in an asymmetric voltage pattern, i.e. voltages of equal magnitude and equal polarity are applied to opposite right-angled sector-shaped cylindrical electrodes (4) of the quadrupole deflection electrodes, and voltages of unequal magnitude and opposite polarity are applied to adjacent right-angled sector-shaped cylindrical electrodes (4); voltages with equal magnitude and the same positive and negative are applied to four L-shaped electrodes (5) in the quadrupole deflection electrode.
6. The compact electrostatic storage ring arrangement for charged particle storage according to claim 1, wherein the electrostatic singlet lens (7) consists of three metal cylindrical electrodes coaxially arranged, spaced from each other and connected by a connecting rod; the first metal cylinder electrode and the third metal cylinder electrode are the same in length and are both smaller than the second metal cylinder electrode in length.
7. The compact electrostatic storage ring arrangement for charged particle storage according to claim 5, wherein the first and third metal cylinder electrodes are grounded when a voltage is applied to each of the three metal cylinder electrodes in the electrostatic singlet lens (7).
8. The compact electrostatic storage ring arrangement for charged particle storage according to claim 5, wherein the electrostatic singlet lens (7) is externally wrapped with a grounded shield tube (8).
9. The compact electrostatic storage ring arrangement for charged particle storage of claim 1 wherein the beam deflection module as the beam inlet, the voltage applied to the beam deflection module is pulsed at a frequency consistent with the front beam injection frequency, while the voltages applied to the other three beam deflection modules are kept constant at constant voltage.
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