CN107896415A - Compact high frequency electrofocusing mixes accelerating cavity - Google Patents

Compact high frequency electrofocusing mixes accelerating cavity Download PDF

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Publication number
CN107896415A
CN107896415A CN201710967331.6A CN201710967331A CN107896415A CN 107896415 A CN107896415 A CN 107896415A CN 201710967331 A CN201710967331 A CN 201710967331A CN 107896415 A CN107896415 A CN 107896415A
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CN
China
Prior art keywords
accelerating
high frequency
quadrupole
drift tube
electrofocusing
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CN201710967331.6A
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Chinese (zh)
Inventor
何源
王志军
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中国科学院近代物理研究所
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Priority to CN201710967331.6A priority Critical patent/CN107896415A/en
Publication of CN107896415A publication Critical patent/CN107896415A/en

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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05HPLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H7/00Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
    • H05H7/001Arrangements for beam delivery or irradiation

Abstract

The present invention relates to a kind of compact high frequency electrofocusing to mix accelerating cavity, belongs to nuclear energy technology field.A kind of compact high frequency electrofocusing mixes accelerating cavity, it, which is mainly characterized by, includes in chamber cylinder, radio frequency quadrupole accelerating structure is provided with the front end that drift tube accelerates to focus on accelerating structure with high frequency electric quadrupole, the second accelerating gap is provided with the center that drift tube accelerates to focus on accelerating structure with high frequency electric quadrupole, the center of radio frequency quadrupole accelerating structure is provided with the first accelerating gap, first accelerating gap and the second accelerating gap are on same center line, the first accelerating gap 0 5mm smaller than the radius of the second accelerating gap.It is an advantage of the invention that the structure can directly accelerate the direct current beam come out from ion gun;Due to compact-sized, the length of cavity can be effectively reduced, improves effective accelerating gradient so that quality of beam is excellent.

Description

Compact high frequency electrofocusing mixes accelerating cavity

Technical field

The present invention relates to a kind of novel compact type high frequency electrofocusing to mix accelerating cavity, belongs to nuclear energy technology field.

Background technology

The accelerating structure of low energy ion accelerator mainly includes radio frequency quadrupole accelerator and drift cast accelerator.Radio frequency four Pole accelerator is that last century the seventies grow up, and is mainly used for acceleration and pack that ion gun draws direct current beam, its is excellent Point is that the transverse and longitudinal that can realize line simultaneously is focused on and accelerated, but a disadvantage is that the acceleration efficiency in accelerating part is very low, is put down Equal acceleration capacity is about 1MeV/m, and output energy is substantially in 3MeV or so.

The cast accelerator that drifts about is to grow up in the twenty or thirty age in last century, is the acceleration knot commonly used in particle accelerator Structure.Its main acceleration principle is that charged particle passes through accelerating gap, experiences accelerating field;By half of high frequency period, electricity Field is changed into negative electric field, and now particle enters inside drift tube, so will not experience negative electric field and be decelerated;Also pass through lower half When individual high frequency period enters next accelerating gap, electric field is changed into positive electric field in accelerating gap, so as to which charged particle is whole It is to accelerate in individual structure.Drift about cast accelerator the advantages of be acceleration efficiency height, about 3MeV/u, but its shortcoming be can not Accelerate direct current beam.In addition in conventional Drift pipe accelerating structure, charged particle is due to by space charge effect and HF defocusing Effect, horizontal envelope can be increasing, so as to cause the loss of line, so needing to carry out laterally using outside focusing original paper Pack ensure the stable transmission of line, so as to causing the complexity of control and the increase of cost.

The content of the invention

It is an object of the invention to avoid the deficiencies in the prior art from providing a kind of compact high frequency electrofocusing to mix accelerating cavity. To solve the acceleration of the ion beam current of low energy direct current beam, low prior art acceleration efficiency, beam acceleration poor quality, control are avoided Complicated, the problems such as element is various.

To achieve the above object, the technical scheme taken of the present invention is:A kind of compact high frequency electrofocusing mixes accelerating cavity, It, which is mainly characterized by, includes in chamber cylinder, accelerates to be provided with the front end of high frequency electric quadrupole focusing accelerating structure in drift tube and penetrates Frequency quadrupole accelerating structure, the second accelerating gap is provided with the center that drift tube accelerates to focus on accelerating structure with high frequency electric quadrupole, is penetrated The center of frequency quadrupole accelerating structure is provided with the first accelerating gap, and the first accelerating gap and the second accelerating gap are in same center line On, the first accelerating gap is smaller 0-5mm than the radius of the second accelerating gap.Radio frequency quadrupole accelerating structure and drift tube acceleration and high frequency Electric quadrupole focuses on accelerating structure, and for a kind of mixing accelerating structure, wherein radio frequency quadrupole accelerating structure is used to tentatively accelerate line With longitudinal beam shaping, drift tube accelerates to be mainly used in beam acceleration with high frequency electric quadrupole focusing accelerating structure.

Described compact high frequency electrofocusing mixes accelerating cavity, also includes and is provided with each other in radio frequency quadrupole accelerating structure Four vertical first electrode plates, the end face of battery lead plate is provided with sinusoidal or T-shaped electrode modulation line;Modulation lines cross section is hyperbolic Line style, the least radius between opposite first pole plate is 2.5-5mm, maximum radius 4-20mm.

Described compact high frequency electrofocusing mixes accelerating cavity, also includes described drift tube and accelerates and high frequency electric quadrupole Focus in accelerating structure and be provided with four vertical each other second electrode plates.

Described compact high frequency electrofocusing mixes accelerating cavity, also includes described drift tube and accelerates and high frequency electric quadrupole Focus in accelerating structure and be provided with multiple drift tubes, it is high between being fixed on relative two second electrode plates by drift tube support bar Frequency electric quadrupole lens are distributed between drift tube;Multiple drift tubes, high-frequency electrical quadrupole lense are with the second accelerating gap same On center line;Vertical high frequency electric quadrupole lens in opposite directions be located at drift tube between, and be fixed on two vertical second electrode plates it Between;Horizontal high-frequent electric quadrupole lens are located between drift tube in opposite directions, and are fixed between two horizontal second electrode plates.

Described compact high frequency electrofocusing mixes accelerating cavity, and the first described accelerating gap is true with the second accelerating gap Reciprocal of duty cycle is 10-5-10-7Pa。

Described compact high frequency electrofocusing mixes accelerating cavity, and the drift tube support bar of described adjacent drift tube is each other It is vertically arranged.

Described compact high frequency electrofocusing mixes accelerating cavity, and described vertical high frequency electric quadrupole lensed endface is straight Section, cross section is hyperbolic-type, and the distance of relative second electrode plate is 5-40mm.

Described compact high frequency electrofocusing mixes accelerating cavity, and the length of described drift tube is 5-100mm;Internal diameter is 5- 50mm, the accelerating gap distance between two neighboring drift tube is 5-50mm.

Described compact high frequency electrofocusing mixes accelerating cavity, described high-frequency electrical quadrupole lense and adjacent drift tube it Between distance be 5-50mm.

Described compact high frequency electrofocusing mixes accelerating cavity, described chamber cylinder, battery lead plate, drift tube and high frequency electric quadrupole The material of lens is metallic copper or stainless steel copper facing.

Beneficial effects of the present invention:It is an advantage of the invention that the structure can directly accelerate the direct current come out from ion gun Beam;Due to compact-sized, the length of cavity can be effectively reduced, improves effective accelerating gradient so that quality of beam is excellent;This Structure will accelerate, and transverse and longitudinal focusing function is incorporated in same frequency cavity body, and cavity shunt impedance is high, and high frequency power consumption is greatly Reduce;The acceleration control of line is completed in same cavity, control cost can be greatly reduced, be easy to industrial applications. The present invention is mainly used for the acceleration of high current low energy ion line, proton or heavy particle therapy device available for high-current accelerator Injector, industrial ionic injection, irradiation agricultural, neutron photography, move the applied accelerators such as neutron source, boron neutron be for cancer.

Brief description of the drawings:

Fig. 1 is schematic front view of the present invention;

Fig. 2 is radio frequency quadrupole accelerating structure schematic diagram;

Fig. 3 is that drift tube accelerates to focus on accelerating structure schematic diagram with high frequency electric quadrupole;

The horizontal profile schematic diagram of Fig. 4 (a) high-frequency electrical quadrupole lenses;

The diagrammatic cross-section of Fig. 4 (b) high-frequency electrical quadrupole lenses.

Embodiment

The principle and feature of the present invention are described with reference to embodiments, the given examples are served only to explain the present invention, It is not intended to limit the scope of the present invention.Present disclosure is described in detail below.

Embodiment 1:See Fig. 1, Fig. 2, Fig. 3, Fig. 4, a kind of compact high frequency electrofocusing mixes accelerating cavity, and its main feature exists In including in chamber cylinder 3, accelerate in the front end that drift tube accelerates to focus on accelerating structure 2 with high frequency electric quadrupole provided with radio frequency quadrupole Structure 1, the second accelerating gap 2-1, radio frequency quadrupole are provided with the center that drift tube accelerates to focus on accelerating structure 2 with high frequency electric quadrupole The center of accelerating structure 1 is provided with the first accelerating gap 1-1, the first accelerating gap 1-1 and the second accelerating gap 2-1 in same On heart line, the first accelerating gap 1-1 is equal with the second accelerating gap 2-1 radius.Radio frequency quadrupole accelerating structure 1 and drift tube add Speed focuses on accelerating structure 2 with high frequency electric quadrupole, and for a kind of mixing accelerating structure, wherein radio frequency quadrupole accelerating structure 1 is used for beam Stream is preliminary to be accelerated to focus on accelerating structure 2 with longitudinal beam shaping, drift tube acceleration with high frequency electric quadrupole and be mainly used in beam acceleration. In the preparation, drift tube accelerates the split of radio frequency quadrupole accelerating structure 1 for focusing on accelerating structure 2 with high frequency electric quadrupole and front end is provided with Prepare.

Described is provided with vertical each other four first electrodes plate 1-2, battery lead plate 1-2 in radio frequency quadrupole accelerating structure 1 End face be provided with sinusoidal or T-shaped electrode modulation line;Modulation lines cross section is hyperbolic-type, between opposite first pole plate 1-2 Least radius be 2.5mm, maximum radius 4mm.

Also include described drift tube to accelerate to focus in accelerating structure 2 provided with vertical each other four with high frequency electric quadrupole Second electrode plate 2-2.

Also include described drift tube to accelerate with being provided with multiple drift tube 2-3 in high frequency electric quadrupole focusing accelerating structure 2, Between being fixed on relative two second electrode plate 2-2 by drift tube support bar 2-4, high-frequency electrical quadrupole lense 2-5 is distributed in drift Move between pipe 2-3;Multiple drift tube 2-3, high-frequency electrical quadrupole lense 2-5 and the second accelerating gap 2-1 are on same center line; Vertical high frequency electric quadrupole lens 2-5 in opposite directions be located at drift tube 2-3 between, and be fixed on two vertical second electrode plate 2-1 it Between;Horizontal high-frequent electric quadrupole lens 2-5 is located between drift tube 2-3 in opposite directions, and is fixed on two horizontal second electrode plate 2-1 Between.

The first described accelerating gap 1-1 and the second accelerating gap 2-1 vacuum are 10-5-10-7Pa。

Described adjacent drift tube 2-3 drift tube support bar 2-4 is vertically arranged each other.

Described vertical high frequency electric quadrupole lens 2-5 end faces are flat segments, and cross section is hyperbolic-type, the relative second electricity The distance of pole plate is 5mm.

Described drift tube 2-3 length is 5mm;Internal diameter is 5mm, the accelerating gap distance between two neighboring drift tube For 5mm.

The distance between described high-frequency electrical quadrupole lense 2-5 and adjacent drift tube are 5mm.

Described compact high frequency electrofocusing mixes accelerating cavity, described chamber cylinder, battery lead plate, drift tube and high frequency electric quadrupole The material of lens is metallic copper.

Embodiment 2:See Fig. 1, Fig. 2, Fig. 3, Fig. 4, a kind of compact high frequency electrofocusing mixes accelerating cavity, included in chamber cylinder In 3, radio frequency quadrupole accelerating structure 1 is provided with the front end that drift tube accelerates to focus on accelerating structure 2 with high frequency electric quadrupole, in drift tube The center for accelerating to focus on accelerating structure 2 with high frequency electric quadrupole is provided with the second accelerating gap 2-1, in radio frequency quadrupole accelerating structure 1 The heart is provided with the first accelerating gap 1-1, the first accelerating gap 1-1 and the second accelerating gap 2-1 on same center line, and first adds Fast gap 1-1 is smaller 2mm than the second accelerating gap 2-1 radius.Radio frequency quadrupole accelerating structure 1 and drift tube accelerate and high-frequency electrical four Pole focuses on accelerating structure 2, for a kind of mixing accelerating structure, wherein radio frequency quadrupole accelerating structure 1 be used to tentatively accelerate line and Longitudinal beam shaping, drift tube accelerate to be mainly used in beam acceleration with high frequency electric quadrupole focusing accelerating structure 2.In the preparation, float Move the overall preparation of radio frequency quadrupole accelerating structure 1 that pipe acceleration focuses on accelerating structure 2 with high frequency electric quadrupole and front end is provided with.

Described is provided with vertical each other four first electrodes plate 1-2, battery lead plate 1-2 in radio frequency quadrupole accelerating structure 1 End face be provided with sinusoidal or T-shaped electrode modulation line;Modulation lines cross section is hyperbolic-type, between opposite first pole plate 1-2 Least radius be 3.5mm, maximum radius 10mm.

The described described drift tube that also includes accelerates to focus in accelerating structure 2 provided with vertical each other with high frequency electric quadrupole Four second electrode plate 2-2.

The described described drift tube that also includes accelerates with being provided with multiple drifts in high frequency electric quadrupole focusing accelerating structure 2 Pipe 2-3, between being fixed on relative two second electrode plate 2-2 by drift tube support bar 2-4,2-5 points of high-frequency electrical quadrupole lense It is distributed between drift tube 2-3;Multiple drift tube 2-3, high-frequency electrical quadrupole lense 2-5 and the second accelerating gap 2-1 are in same On heart line;Vertical high frequency electric quadrupole lens 2-5 is located between drift tube 2-3 in opposite directions, and is fixed on two vertical second electrodes Between plate 2-1;Horizontal high-frequent electric quadrupole lens 2-5 is located between drift tube 2-3 in opposite directions, and is fixed on two the second horizontal electricity Between pole plate 2-1.

The first described accelerating gap 1-1 and the second accelerating gap 2-1 vacuum are 10-5-10-7Pa。

Described adjacent drift tube 2-3 drift tube support bar 2-4 is vertically arranged each other.

Described vertical high frequency electric quadrupole lens 2-5 end faces are flat segments, and cross section is hyperbolic-type, the relative second electricity The distance of pole plate is 20mm.

Described drift tube 2-3 length is 50mm;Internal diameter is 20mm, the accelerating gap between two neighboring drift tube away from From for 20mm.

The distance between described high-frequency electrical quadrupole lense 2-5 and adjacent drift tube are 20mm.

Described compact high frequency electrofocusing mixes accelerating cavity, described chamber cylinder, battery lead plate, drift tube and high frequency electric quadrupole The material of lens is stainless steel copper facing.

Embodiment 3:Seeing Fig. 1, Fig. 2, Fig. 3, Fig. 4, a kind of compact high frequency electrofocusing mixes accelerating cavity, in chamber cylinder 3, Drift tube accelerate with high frequency electric quadrupole focus on accelerating structure 2 front end be provided with radio frequency quadrupole accelerating structure 1, drift tube accelerate and The center that high frequency electric quadrupole focuses on accelerating structure 2 is provided with the second accelerating gap 2-1, and the center of radio frequency quadrupole accelerating structure 1 is provided with First accelerating gap 1-1, the first accelerating gap 1-1 and the second accelerating gap 2-1 is on same center line, the first accelerating gap 1-1 is smaller 5mm than the second accelerating gap 2-1 radius.Radio frequency quadrupole accelerating structure 1 and drift tube accelerate to focus on high frequency electric quadrupole Accelerating structure 2, for a kind of mixing accelerating structure, wherein radio frequency quadrupole accelerating structure 1 is used to tentatively accelerate line and longitudinal beam Stream shaping, drift tube accelerate to be mainly used in beam acceleration with high frequency electric quadrupole focusing accelerating structure 2.

Described is provided with vertical each other four first electrodes plate 1-2, battery lead plate 1-2 in radio frequency quadrupole accelerating structure 1 End face be provided with sinusoidal or T-shaped electrode modulation line;Modulation lines cross section is hyperbolic-type, between opposite first pole plate 1-2 Least radius be 5mm, maximum radius 20mm.

The described described drift tube that also includes accelerates to focus in accelerating structure 2 provided with vertical each other with high frequency electric quadrupole Four second electrode plate 2-2.

The described described drift tube that also includes accelerates with being provided with multiple drifts in high frequency electric quadrupole focusing accelerating structure 2 Pipe 2-3, between being fixed on relative two second electrode plate 2-2 by drift tube support bar 2-4,2-5 points of high-frequency electrical quadrupole lense It is distributed between drift tube 2-3;Multiple drift tube 2-3, high-frequency electrical quadrupole lense 2-5 and the second accelerating gap 2-1 are in same On heart line;Vertical high frequency electric quadrupole lens 2-5 is located between drift tube 2-3 in opposite directions, and is fixed on two vertical second electrodes Between plate 2-1;Horizontal high-frequent electric quadrupole lens 2-5 is located between drift tube 2-3 in opposite directions, and is fixed on two the second horizontal electricity Between pole plate 2-1.

The first described accelerating gap 1-1 and the second accelerating gap 2-1 vacuum are 10-5-10-7Pa。

Described adjacent drift tube 2-3 drift tube support bar 2-4 is vertically arranged each other.

Described vertical high frequency electric quadrupole lens 2-5 end faces are flat segments, and cross section is hyperbolic-type, the relative second electricity The distance of pole plate is 40mm.

Described drift tube 2-3 length is 100mm;Internal diameter is 50mm, the accelerating gap between two neighboring drift tube Distance is 50mm.

The distance between described high-frequency electrical quadrupole lense 2-5 and adjacent drift tube are 50mm.

Described compact high frequency electrofocusing mixes accelerating cavity, described chamber cylinder, battery lead plate, drift tube and high frequency electric quadrupole The material of lens is metallic copper.

Above-described embodiment is the preferable embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment Limitation, other any Spirit Essences without departing from the present invention with made under principle change, modification, replacement, combine, simplification, Equivalent substitute mode is should be, is included within protection scope of the present invention.

Claims (10)

1. a kind of compact high frequency electrofocusing mixes accelerating cavity, it is characterised in that include in chamber cylinder, drift tube accelerate with The front end that high frequency electric quadrupole focuses on accelerating structure is provided with radio frequency quadrupole accelerating structure, accelerates to focus on high frequency electric quadrupole in drift tube The center of accelerating structure is provided with the second accelerating gap, and the center of radio frequency quadrupole accelerating structure is provided with the first accelerating gap, and first adds With the second accelerating gap on same center line, the first accelerating gap is smaller 0-5mm than the radius of the second accelerating gap in fast gap.
2. compact high frequency electrofocusing as claimed in claim 1 mixes accelerating cavity, it is characterised in that also includes in radio frequency four Four vertical each other first electrode plates are provided with the accelerating structure of pole, the end face of battery lead plate is provided with sinusoidal or T-shaped electrode modulation Line;Modulation lines cross section is hyperbolic-type, and the least radius between opposite first pole plate is 2.5-5mm, maximum radius 4- 30mm。
3. compact high frequency electrofocusing as claimed in claim 1 mixes accelerating cavity, it is characterised in that also includes described drift Pipe is moved to accelerate to be provided with four vertical each other second electrode plates with high frequency electric quadrupole focusing accelerating structure.
4. compact high frequency electrofocusing as claimed in claim 1 mixes accelerating cavity, it is characterised in that also includes described drift Pipe is moved to accelerate, with being provided with multiple drift tubes in high frequency electric quadrupole focusing accelerating structure, relative two to be fixed on by drift tube support bar Between individual second electrode plate, high-frequency electrical quadrupole lense is distributed between drift tube;Multiple drift tubes, high-frequency electrical quadrupole lense and Two accelerating gaps are on same center line;Vertical high frequency electric quadrupole lens are located between drift tube in opposite directions, and are fixed on two Between vertical second electrode plate;Horizontal high-frequent electric quadrupole lens are located between drift tube in opposite directions, and be fixed on two it is horizontal Between second electrode plate.
5. compact high frequency electrofocusing as claimed in claim 1 mixes accelerating cavity, it is characterised in that between described first accelerates Gap and the vacuum of the second accelerating gap are 10-5-10-7Pa。
6. compact high frequency electrofocusing as claimed in claim 1 mixes accelerating cavity, it is characterised in that described adjacent drift Pipe support bar is vertically arranged each other.
7. compact high frequency electrofocusing as claimed in claim 1 mixes accelerating cavity, it is characterised in that described vertical high frequency electricity Quadrupole lense end face is flat segments, and cross section is hyperbolic-type, and the distance of relative second electrode plate is 5-40mm.
8. compact high frequency electrofocusing as claimed in claim 1 mixes accelerating cavity, it is characterised in that the length of described drift tube Spend for 5-100mm;Internal diameter is 5-50mm, and the accelerating gap distance between two neighboring drift tube is 5-50mm.
9. compact high frequency electrofocusing as claimed in claim 1 mixes accelerating cavity, it is characterised in that described high frequency electric quadrupole The distance between lens and adjacent drift tube are 5-50mm.
10. compact high frequency electrofocusing as claimed in claim 1 mixes accelerating cavity, it is characterised in that described chamber cylinder, electrode The material of plate, drift tube and high-frequency electrical quadrupole lense is metallic copper or stainless steel copper facing.
CN201710967331.6A 2017-10-17 2017-10-17 Compact high frequency electrofocusing mixes accelerating cavity CN107896415A (en)

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