JP2000200699A - Charged particle accelerating cavity power coupler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a charged particle accelerating cavity power coupler capa ble of simplify a structure of superconductive cavity resonance mainbody, a liquid helium jacket and beam ducts and reducing the manufacturing cost. SOLUTION: Beam ducts 5A, 5B are attached to both ends of a superconductive cavity 1A formed with five series of cells and a portion of the superconductive cavity 1A is encircled by a liquid helium jacket 2A and cooled down to a critical temperature or lower. The liquid helium jacket 2A is encircled by a heat shield 3A and wholly stored in a vacuum container 4A for heat insulation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention can reduce the manufacturing cost, improve the axial symmetry of the electric field induced in the superconducting cavity, and eliminate the fear of superconducting cavity contamination during the assembly work. The present invention relates to a power coupler for a charged particle accelerating cavity capable of simplifying the structure of a coaxial line portion.

[0002]

2. Description of the Related Art FIGS. 14 and 15 are structural views showing a conventional superconducting cavity resonator power coupler and a superconducting accelerating cavity module, and FIG. 16 is a structural view showing a conventional superconducting cavity resonator power coupler. Such a superconducting cavity resonator power coupler and a superconducting acceleration cavity module are described in, for example, MARK S.A. "RF INP" by CHAMPION
UT COUPLERS AND WINDOWS: P
ERFORMANES, LIMITATIONS '
AND RECENT DEVELOPMENTS "P
rosedings of 7th Worksho
p on Superconductivity, p1
95-221 (1995).

In FIG. 1, reference numeral 1 denotes a superconducting cavity made of a superconducting material Nb plate, which is cooled below a critical temperature by liquid helium stored in a liquid helium jacket 2. 4 is a vacuum vessel substantially perpendicular to the particle beam orbit axis 0A (coaxial line), 5 is a beam duct, 11 is provided above the superconducting accelerating cavity module, and converts a high frequency generated by an external external high frequency power supply to a coaxial line. A coaxial line-to-waveguide converter 50 is a beam duct side port opened to the side of the beam duct 5 to which the high frequency converted into a coaxial line by the coaxial line-waveguide converter 11 is connected.

Next, the operation will be described. Superconducting material Nb
A superconducting cavity 1 made of a plate is cooled below a critical temperature by liquid helium stored in a liquid helium jacket 2. The high frequency generated by an external external high-frequency power source is transported by a waveguide, converted into a coaxial line by a coaxial line-waveguide converter 11 located above the superconducting acceleration cavity module, and opened to the side of the beam duct 5. Beam duct side port 50.

A high-frequency electric field is excited inside the superconducting cavity 1 by a rod-shaped antenna 10 serving as an inner conductor of the coaxial line, and accelerates charged particles incident along the beam duct 5. The tuner drive mechanism pushes and pulls the beam duct 5 in the beam axis direction with reference to the flange surface of the vacuum vessel 4 substantially perpendicular to the beam orbit axis 0A (coaxial line).
The length of the internal superconducting cavity 1 is adjusted, and as a result, the resonance frequency of the superconducting cavity 1 is adjusted. Between the side port of the beam duct 5 and the coaxial line-to-waveguide converter 11, a donut plate-shaped ceramic vacuum window is installed in the coaxial line portion where the rod-shaped antenna 10 forms the inner conductor, and the superconducting cavity resonance The ultra-high vacuum inside the chamber is shielded from the outside atmosphere.

FIG. 16 shows a TESLAT of DESY shown in FIG. 16 of the same document as FIG. 14 and FIG.
FIG. 2 is a configuration diagram showing a power coupler whose coupling coefficient can be adjusted, which is under development at EST FASILITY. In the figure, the particle beam orbit axis 0A (coaxial line) is perpendicular to the paper surface, and the liquid helium jacket vacuum container and the like are omitted.

Here, in order to adjust the amount of insertion of the rod-shaped antenna 10 into the beam duct 5 and to enable the setting of the coupling coefficient of the coupler to be changed, a total of three coaxial lines are required.
Bellows 101 is put in the place. Two of these bellows 101 have a role to cope with the relative position of the beam duct 5 and the vacuum vessel 4 moving with the cooling of the superconducting cavity 1, and have a very complicated structure. Has become.

[0008]

Since the conventional power coupler for a charged particle accelerating cavity is configured as described above,
The rod-shaped antenna 10 is inserted from the beam duct side port 50 opened on the side of the beam duct 5, and the structure of the superconducting cavity resonator body, the liquid helium jacket, the beam duct, etc. becomes complicated, and assembly is not easy. There were challenges.

Further, there is a problem that the axial symmetry of the electric field induced in the superconducting cavity is poor.

Further, it is necessary to attach a power coupler after the superconducting cavity is assembled in the vacuum vessel, and there is a problem that dust may enter the superconducting cavity during this process. .

Further, when the coupler has a function of adjusting the coupling coefficient, there is a problem that the structure of the coaxial line portion becomes complicated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and the structure of a superconducting cavity resonator body, a liquid helium jacket, a beam duct and the like can be simplified, and the manufacturing cost can be reduced. An object of the present invention is to obtain a power coupler for a charged particle accelerating cavity.

Another object of the present invention is to provide a power coupler for a charged particle accelerating cavity capable of improving axial symmetry of an electric field induced in a superconducting cavity.

Further, according to the present invention, the superconducting cavity main body can be assembled in a liquid helium jacket or a vacuum vessel in a state where a ceramic vacuum window is attached and sealed, thereby preventing contamination of the superconducting cavity during the assembling operation. It is an object of the invention to obtain a power coupler for a charged particle accelerating cavity capable of performing the following.

A further object of the present invention is to provide a power coupler for a charged particle accelerating cavity which can simplify the structure of the coaxial line portion even when the coupler has a function of adjusting a coupling coefficient. And

[0016]

In a power coupler for a charged particle accelerating cavity according to the present invention, a pair of beam ducts are attached to both ends of a cavity resonator, and charged particles incident through one of the beam ducts. Is accelerated by a high-frequency electric field by a superconducting cavity, taken out through the other beam duct, and a cylindrical antenna is inserted into the beam duct from the outside of the cavity resonator along the beam orbit axis. The coaxial line was formed from the gap between the beam duct and the cylindrical antenna by passing the particle beam through the inner hollow space, and this coaxial line was connected to the waveguide outside the cavity resonator by an external high-frequency power supply. Things.

A power coupler for a charged particle accelerating cavity according to the present invention surrounds a conducting cavity resonator made of a superconducting material plate and surrounds a liquid helium tank for cooling the superconducting cavity by a vacuum vessel. By a pair of beam ducts attached to both ends of the resonator, charged particles incident on one side are accelerated by a high-frequency electric field in the superconducting cavity, then taken out through the other, and along the particle beam orbit axis in the beam duct part Pass the particle beam through the hollow coaxial line inside the cylindrical cylindrical antenna inserted from the outside of the vacuum vessel,
The coaxial line is connected to the waveguide outside the cavity resonator by an external high-frequency power supply.

In the power coupler for a charged particle accelerating cavity according to the present invention, the impedance of the coaxial line of the cylindrical antenna and the impedance of the waveguide connected to the coaxial line of the cylindrical antenna are determined by the impedance converter. This is set to a value different from the impedance of the waveguide which is the output line of the external high-frequency power supply.

In the power coupler for a charged particle accelerating cavity according to the present invention, all or a part of a beam duct or all or a part of a cylindrical antenna has a bellows structure, and a beam is adjusted by adjusting expansion and contraction of the bellows structure. An antenna insertion amount adjusting mechanism for adjusting an insertion amount of a cylindrical antenna into a duct is provided to adjust a coupling coefficient between a superconducting cavity resonator and a cylindrical antenna.

In the power coupler for a charged particle accelerating cavity according to the present invention, the impedance on the superconducting cavity side as viewed from the external high frequency power supply is adjusted by an impedance converter to adjust the tuning condition.

A charged particle accelerating cavity power coupler according to the present invention is provided with a ceramic vacuum window near a connecting portion from a particle beam orbit axis to a waveguide.

In the power coupler for a charged particle accelerating cavity according to the present invention, the insertion amount of the cylindrical antenna is readjusted in synchronism with the tuner operation by the tuner driving mechanism, and the coupling coefficient accompanying the deformation of the superconducting cavity by the tuner. Is set to be constant.

In the power coupler for a charged particle accelerating cavity according to the present invention, a cylindrical antenna is cooled by air or water or a similar cooling medium.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a configuration diagram showing a power coupler for a charged particle accelerating cavity according to a first embodiment of the present invention. In the figure, 1A is composed of five cells, and a superconducting device has beam ducts 5A and 5B at both ends. The cavity 2A is a liquid helium jacket that surrounds the superconducting cavity 1A and is cooled to a critical temperature or lower, and is surrounded by a heat shield 3A and is entirely housed in a vacuum container 4A for heat insulation. 6A is a tuner drive mechanism for adjusting the distance between the flange provided with the beam duct 5B and the vacuum vessel wall.

Next, the operation will be described. Beam ducts 5A and 5B are provided at both ends of a superconducting cavity 1A comprising five cells.
The portion of the superconducting cavity 1A is surrounded by a liquid helium jacket 2A and cooled to a temperature below the critical temperature. The liquid helium jacket 2A is surrounded by a heat shield 3A, and the whole is contained in a vacuum container 4A for heat insulation. In the figure, the right beam duct 5A is fixed to the vacuum vessel 4A via a flange, and the right end of the liquid helium jacket 2A is also fixed to the beam duct 5A. The left beam duct 5B is connected to the vacuum vessel 4A via a flange and a bellows 8A, and the left end of the liquid helium jacket 2A is also fixed to the beam duct 5B.

The tuner drive mechanism 6A includes a beam duct 5B
By adjusting the distance between the flanged box and the vacuum vessel wall, the length of the superconducting cavity 1A is controlled, and the resonance frequency of the superconducting cavity 1A is adjusted. The liquid helium jacket 2A has a bellows 9A inserted in the middle, and is configured to cope with a change in the length of the superconducting cavity 1A. From the left side of the beam duct 5A, a cylindrical antenna 10
Insert 0A on the concentric circle. This cylindrical antenna 100
High-frequency power is supplied into the superconducting cavity 1A from a coaxial line having A as an inner conductor and beam ducts 5A and 5B as outer conductors, and a high-frequency electric field is excited in the superconducting cavity 1A.

This coaxial line is converted into a waveguide 10 by a coaxial tube-to-waveguide converter 101A placed outside the vacuum vessel 4A.
Waveguide 1 converted to 2A and coming from external high frequency power supply 7A
02A. Charged particles incident from the beam duct 5B are accelerated rightward in the figure by the superconducting cavity 1A and proceed to the beam duct 5A side, but pass through the inside of the cylindrical antenna 100A and are taken out of the superconducting cavity 1A. .

In the above description, the traveling direction of the charged particles in the figure is from the right, but the beam may pass in the opposite direction. Further, in the first embodiment, the case of the superconducting acceleration cavity module has been described, but the liquid helium jacket 2A,
The beam duct 5 used for the superconducting cavity described above can be used for an unnecessary normal conducting accelerating cavity such as an insulated vacuum vessel 4A.
By mounting A and 5B and cylindrical antenna 100A in the same manner, a high-frequency electric field can be excited in the normal conduction acceleration cavity.

As described above, according to the first embodiment, the superconducting cavity resonator body, the liquid helium jacket,
The structure of the beam duct, etc. is simplified, and the manufacturing cost can be reduced. In addition, even if this coupler has the function of adjusting the coupling coefficient, the structure of the coaxial line can be simplified. The effect is obtained.

Embodiment 2 FIG. FIG. 2 is a configuration diagram showing a charged particle accelerating cavity power coupler according to a second embodiment of the present invention. In the cylindrical antenna 100C, the inner and outer diameters of the cylinder are increased, and the aperture through which charged particles can pass is widened.
When the diameter of the beam ducts 5A and 5B is increased and the diameter of the cylindrical antenna 100C is increased, the impedance of the coaxial line formed by the two is reduced, and the coaxial line for converting the impedance into the waveguide 102C whose impedance is reduced correspondingly. A tube-waveguide conversion unit 101C is used. At this time, since the impedance of the waveguide 102C is different from the impedance of the waveguide 102A connected to the output of the external high-frequency power supply 7A, the impedance converter 201C is inserted between the two.

As described above, according to the second embodiment, in addition to the effects of the first embodiment, effects such as improvement of the axial symmetry of the electric field induced in superconducting cavity 1A can be obtained. can get.

Embodiment 3 FIG. FIG. 3 is a configuration diagram showing a charged particle accelerating cavity power coupler according to Embodiment 3 of the present invention. The same reference numerals as those in Embodiment 1 and Embodiment 2 are the same or similar, and therefore, description thereof will be omitted. I do.
Cylindrical antenna 100A and coaxial waveguide-waveguide converter 101
A is connected to the vacuum container 4A via the bellows 301A, and the antenna insertion amount adjusting mechanism 302
A, the beam duct 5 of the cylindrical antenna 100A
The insertion amount for A can be adjusted.

Next, the operation will be described. Superconducting cavity 1
The coupling coefficient of the input circuit (cylindrical antenna 100A, waveguide 102A, external high frequency power supply 7A) to A can be adjusted. A change in the relative position with respect to the beam ducts 5A and 5B outside the superconducting acceleration cavity module and the waveguide 102A due to the movement of the coaxial waveguide-waveguide converter 101A is absorbed by bellows 303A and 304A.

FIG. 4 is a configuration diagram showing another charged particle accelerating cavity power coupler according to Embodiment 3 of the present invention. The same reference numerals as those in Embodiments 1 to 3 denote the same or similar parts. Therefore, the description is omitted. Two superconducting cavities 1A and 1B each composed of four cells are connected via a beam duct 5C, and are incorporated in one liquid helium jacket 2B, heat shield 3B, and vacuum vessel 4B. The beam duct 5C is fixed from the liquid helium jacket 2B in order to suppress the occurrence of bending.

The tuner driving mechanisms 6A and 6B of the superconducting cavities 1A and 1B and the power coupler mechanism (the cylindrical antenna 10)
0A, 100B, coaxial waveguide-waveguide converter 101A, 10
1B, waveguides 102A and 102B, antenna insertion amount adjusting mechanisms 302A and 302B) are superconducting cavities 1A and 1B.
B are collectively arranged on both sides. The third embodiment is an example in which two superconducting cavities 1A and 1B are connected. However, even when one superconducting cavity 1A and 1B is used, the tuner driving mechanism 6A,
6B and the power coupler mechanism may be arranged together.

FIG. 5 is a block diagram showing another charged particle accelerating cavity power coupler according to the third embodiment of the present invention. The same reference numerals as those in the first to third embodiments denote the same parts. Or, the description is omitted because it is similar. The structure composed of the cylindrical antenna 100C and the coaxial waveguide-waveguide converter 101C shown in the second embodiment and the vacuum vessel 4A
Are connected via a bellows 301A, and the coupling coefficient is adjusted by an antenna insertion amount adjusting mechanism 302A.

As described above, according to the third embodiment, in addition to the effects of the first embodiment, effects such as improvement of the axial symmetry of the electric field induced in superconducting cavity 1A can be obtained. can get.

Embodiment 4 FIG. FIG. 6 is a configuration diagram showing a charged particle accelerating cavity power coupler according to Embodiment 4 of the present invention. The same reference numerals as those in Embodiments 1 to 3 are the same or similar, and therefore description thereof is omitted. I do.
In the third embodiment, the superconducting cavity 1 is adjusted by adjusting the insertion amount of the cylindrical antenna 100D into the beam duct.
A and the coupling between the external high-frequency power source 7A were adjusted, but in FIG.
The impedance converter 401D is inserted in the middle of the waveguide 102D connected to the coaxial waveguide-waveguide converter 101D and the coaxial waveguide-waveguide converter 101D.

Next, the operation will be described. The impedance converter 401D converts the impedance of the waveguide 102D into the impedance of the waveguide 102A.
By changing the conversion ratio, the impedance of the superconducting cavity 1A viewed from the external high-frequency power supply 7A is adjusted, and the coupling coefficient between the superconducting cavity 1A and the external high-frequency power supply 7A is effectively adjusted. For example, in the case of the superconducting cavity 1A,
The impedance of the superconducting cavity 1A is approximately inversely proportional to the current value of the charged particles accelerated by the superconducting cavity 1A. The impedance of the impedance converter 401D viewed superconducting cavity 1A side Z (I), when the impedance of the waveguide 102A is Z _o, the input voltage V _in of the impedance converter 401D (external RF power source 7A side) and the output Voltage V
_out by adjusting to the step-up ratio T of (superconducting cavity 1A _{side) T = V out / V in} = (Z (I) / Z o) 2, an external high frequency power source 7A
From the side, a state where the superconducting cavity 1A side is always in alignment can be realized.

As described above, according to the fourth embodiment, in addition to the effects of the first embodiment, effects such as improvement of the axial symmetry of the electric field induced in superconducting cavity 1A can be obtained. can get.

Embodiment 5 FIG. FIG. 7 is a configuration diagram showing a charged particle accelerating cavity power coupler according to a fifth embodiment of the present invention. The same reference numerals as those in the first to fourth embodiments are the same or similar, and therefore description thereof is omitted. I do.
Cylindrical antenna 100A and coaxial waveguide-waveguide converter 10
Since 1A is mounted on the axis of the beam duct 5A, it can be incorporated into the liquid helium jacket 2A or the vacuum vessel 4A with these parts still mounted. Therefore, if the ceramic vacuum window 501A is attached in the vicinity of these components, the above-mentioned assembling work can be performed with the vacuum sealed.
Superconducting cavity 1A from high-frequency input port during work
There is no need to worry about internal contamination.

As described above, according to the fifth embodiment, in addition to the effects of the first embodiment, there can be obtained an effect of not worrying about contamination of the superconducting cavity during the assembling work.

In FIG. 7, a cylindrical ceramic vacuum window 501A is provided inside the coaxial waveguide-waveguide converter 101A. In the case of this arrangement, the charged particle trajectory (particle beam trajectory axis 0A) incident from the left side moves the ceramic vacuum window 50
Effects such as direct collision of the main particle charged particles to be accelerated and damage to the ceramic vacuum window 501A due to scattered particles inside the superconducting cavity 1A can be obtained without directly expecting 1A.

FIG. 8 is a block diagram showing another charged particle accelerating cavity power coupler according to the fifth embodiment of the present invention, in which a cylindrical ceramic vacuum window 501A is connected to the charged particle accelerating cavity of the third embodiment. This is applied to a power coupler for a trunk.

FIG. 9 is a structural view showing another power coupler for a charged particle accelerating cavity according to the fifth embodiment of the present invention. Here, a coaxial line portion in a gap between the cylindrical antenna 100A and the beam duct 5A is shown. A ceramic vacuum window 501A in the shape of a donut disk is installed at the bottom. In this arrangement, the input high-frequency electric field is directed in the radiation direction perpendicular to the axis of the coaxial line.
The component of the electric field perpendicularly incident on the surface of 1A is small, and it is possible to avoid damage to the ceramic vacuum window 501A by electrons that are resonantly accelerated by a high-frequency electric field such as multipactoring. In this case, in order to avoid damage to the ceramic vacuum window 501A due to charged particles or the like, the charged particles desirably travel from right to left in the figure.

FIG. 10 shows a fifth embodiment of the present invention.
FIG. 13 is a configuration diagram showing another charged particle-accelerated cavity power coupler according to the present invention, in which a cylindrical ceramic vacuum window 501A is applied to the charged particle-accelerated cavity power coupler of the third embodiment. A ceramic vacuum window 501A is provided between the bellows 301A and the coaxial waveguide-waveguide converter 101C.

FIG. 11 shows a fifth embodiment of the present invention.
FIG. 2 is a configuration diagram showing another charged particle accelerating cavity power coupler according to the present invention.
A ceramic vacuum window 501A for the waveguide is provided between A and the waveguide 102A. In the case of this arrangement, an effect is obtained that the replacement operation when the ceramic vacuum window 501A is damaged can be performed relatively easily.

Embodiment 6 FIG. FIG. 12 is a configuration diagram showing a charged particle accelerating cavity power coupler according to Embodiment 6 of the present invention. In the figure, the same reference numerals as those in Embodiments 1 to 5 denote the same or similar parts. Description is omitted. Similarly to the third embodiment, when the tuner driving mechanisms 6A and 6B and the power coupler mechanism are collectively arranged at the same end, the insertion amounts of the cylindrical antennas 100A and 100B are changed by the tuner driving mechanisms 6A and 6B. . Therefore, in FIG. 12, the tuner driving mechanism 601A,
Tuner position setting signals A and B output from 601B are partially branched, processed by arithmetic units 602A and 602B, and used as tuner driving mechanisms 6A and 6B as antenna insertion amount setting signals A and B.
The insertion amounts of the cylindrical antennas 100A and 100B in 6B are corrected. Thus, the operation is performed so as to keep the coupling coefficient of the cylindrical antennas 100A and 100B constant when the tuner is driven.

As described above, according to the sixth embodiment, even when the function of adjusting the coupling coefficient is provided,
The effect that the structure of a coaxial line part can be simplified can be obtained.

Embodiment 7 FIG. FIG. 13 is a configuration diagram showing a charged particle accelerating cavity power coupler according to Embodiment 7 of the present invention. In the figure, the same reference numerals as those in Embodiments 1 to 6 denote the same or similar parts. Description is omitted. In FIG. 13, a reciprocating cooling path is provided inside the cylindrical antenna 100A, and a coolant pressurized by the circulation pump 703A is supplied from a cooling water inlet 701A,
It is taken out from the cooling water outlet 702A and circulated. The amount of heat due to Joule heat generated on the surface of the cylindrical antenna 100A is carried by the coolant to the outside of the superconducting acceleration cavity module, and is taken out of the coolant circulation loop by the heat exchanger 704A. Note that, for example, water, chlorofluorocarbon, air, and nitrogen are suitable as the coolant.

As described above, according to the seventh embodiment, effects such as suppression of temperature rise due to heat generation of cylindrical antenna 100A on superconducting cavity 1A can be obtained.

[0052]

As described above, according to the present invention, a pair of beam ducts are attached to both ends of a cavity resonator, and charged particles incident through one of the beam ducts are subjected to a high-frequency electric field by a superconducting cavity. Then, take out through the other beam duct, insert a cylindrical cylindrical antenna from the outside of the cavity resonator along the beam orbit axis into the beam duct part, and insert the particle beam into the hollow space inside this cylindrical antenna. And a coaxial line is formed from the gap between the beam duct and the cylindrical antenna, and this coaxial line is connected to the waveguide outside the cavity resonator by an external high-frequency power supply. The structure of the vessel body, the liquid helium jacket, the beam duct, and the like is simplified, and the production cost can be reduced.

According to the present invention, the liquid helium tank surrounding the superconducting cavity made of the superconducting material plate and cooling the superconducting cavity is surrounded by the vacuum vessel, and is attached to both ends of the superconducting cavity. The charged particles incident on one side are accelerated by a high-frequency electric field in the superconducting cavity by the pair of beam ducts, then taken out through the other, and inserted into the beam duct along the particle beam orbit axis from outside the vacuum vessel. The particle beam passes through the hollow coaxial line inside the cylindrical cylindrical antenna, and the coaxial line is connected to the waveguide outside the cavity resonator by an external high-frequency power supply. The structure of the main body, the liquid helium jacket, the beam duct and the like is simplified, and there is an effect that the manufacturing cost can be reduced.

According to the present invention, the impedance converter converts the impedance of the coaxial line of the cylindrical antenna and the impedance of the waveguide connected to the coaxial line of the cylindrical antenna into the output line of the external high-frequency power supply. Since the impedance is set to a value different from the impedance of the waveguide, there is an effect that the axial symmetry of the electric field induced in the superconducting cavity can be improved.

According to the present invention, the whole or a part of the beam duct or the whole or a part of the cylindrical antenna has a bellows structure, and the expansion and contraction of the bellows structure is adjusted so that the cylindrical antenna can be inserted into the beam duct. An antenna insertion amount adjustment mechanism that adjusts the insertion amount is provided to adjust the coupling coefficient between the superconducting cavity resonator and the cylindrical antenna, improving the axial symmetry of the electric field induced in the superconducting cavity. There is an effect that can be made.

According to the present invention, the impedance on the side of the superconducting cavity viewed from the external high-frequency power supply is adjusted by the impedance converter to adjust the tuning condition. Therefore, the axial symmetry of the electric field induced in the superconducting cavity is achieved. There is an effect that the property can be improved.

According to the present invention, since the ceramic vacuum window is provided near the connection portion between the particle beam orbit axis and the waveguide, the contamination of the superconducting cavity during the assembling work can be prevented. is there.

According to the present invention, the insertion amount of the cylindrical antenna is readjusted in synchronization with the tuner operation by the tuner drive mechanism, and the coupling coefficient accompanying the deformation of the superconducting cavity by the tuner is made constant. Therefore, even if this coupler has the function of adjusting the coupling coefficient,
There is an effect that the structure of the coaxial line portion can be simplified.

According to the present invention, since the cylindrical antenna is configured to be cooled by air or water or a similar cooling medium, a rise in temperature due to heat generation of the cylindrical antenna on the superconducting cavity side can be suppressed. effective.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a charged particle acceleration cavity power coupler according to Embodiment 1 of the present invention;

FIG. 2 is a configuration diagram showing a power coupler for a charged particle accelerating cavity according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram showing a charged particle accelerating cavity power coupler according to Embodiment 3 of the present invention;

FIG. 4 is a configuration diagram showing another charged particle-accelerated cavity power coupler according to Embodiment 3 of the present invention;

FIG. 5 is a configuration diagram illustrating another charged particle acceleration cavity power coupler according to Embodiment 3 of the present invention;

FIG. 6 is a configuration diagram showing a charged particle accelerating cavity power coupler according to Embodiment 4 of the present invention;

FIG. 7 is a configuration diagram showing a charged particle accelerating cavity power coupler according to Embodiment 5 of the present invention;

FIG. 8 is a configuration diagram showing another charged particle acceleration cavity power coupler according to Embodiment 5 of the present invention.

FIG. 9 is a configuration diagram showing another power coupler for a charged particle acceleration cavity according to the fifth embodiment of the present invention.

FIG. 10 is a configuration diagram showing another charged particle acceleration cavity power coupler according to Embodiment 5 of the present invention.

FIG. 11 is a configuration diagram showing another charged particle acceleration cavity power coupler according to Embodiment 5 of the present invention.

FIG. 12 is a configuration diagram showing a power coupler for a charged particle accelerating cavity according to a sixth embodiment of the present invention.

FIG. 13 is a configuration diagram showing a power coupler for a charged particle acceleration cavity according to a seventh embodiment of the present invention.

FIG. 14 is a configuration diagram showing a conventional superconducting cavity resonator power coupler and a superconducting accelerating cavity module.

FIG. 15 is a configuration diagram showing a conventional superconducting cavity resonator power coupler and a superconducting acceleration cavity module.

FIG. 16 is a configuration diagram showing a conventional superconducting cavity resonator power coupler.

[Explanation of symbols]

0A Particle beam orbit axis, 1A, 1B Superconducting cavity, 4
A vacuum vessel, 5A, 5B beam duct, 6A, 6B
Tuner drive mechanism, 7A, 7B External high frequency power supply, 8
A, 9A Bellows (bellows structure), 100A, 10
0B, 100C, 100D cylindrical antenna, 102A
Waveguide, 201C, 401D impedance converter, 302A, 302B antenna insertion amount adjustment mechanism, 5
01A Ceramic vacuum window.

Claims (8)

[Claims] 1. A method according to claim 1, further comprising the steps of:
A charged particle-accelerated cavity power coupler, comprising: a pair of beam ducts; and a superconducting cavity for accelerating charged particles incident through one of the beam ducts with a high-frequency electric field and extracting the charged particles through the other beam duct. A cylindrical antenna having a cylindrical shape inserted into the portion from the outside of the cavity resonator along the beam orbit axis; and a particle beam passing through a hollow space inside the cylindrical antenna, the beam duct and the cylindrical shape. A power coupler for a charged particle accelerating cavity, comprising: a coaxial line formed from a gap between antennas; and an external high-frequency power supply having the coaxial line connected to a waveguide outside the cavity resonator. 2. A superconducting cavity made of a superconducting material plate, a vacuum vessel surrounding the superconducting cavity and surrounding a liquid helium tank for cooling the superconducting cavity, and both ends of the superconducting cavity. A charged particle-accelerated cavity power coupler, comprising: a pair of beam ducts attached to a portion and accelerated by a high-frequency electric field in the superconducting cavity, the charged particles incident on one side being extracted through the other. A cylindrical cylindrical antenna inserted from the outside of the vacuum vessel along the particle beam trajectory axis, and a particle beam passing through a hollow space inside the cylindrical antenna, the beam duct and the cylindrical antenna A charged particle processing apparatus comprising: a coaxial line formed from a gap; and an external high-frequency power supply having the coaxial line connected to a waveguide outside the cavity resonator. Cavity for power coupler. 3. The impedance of a coaxial line of a cylindrical antenna and the impedance of a waveguide connected to the coaxial line of the cylindrical antenna are different from the impedance of a waveguide as an output line of an external high-frequency power supply. Set to
3. The power coupler for a charged particle accelerating cavity according to claim 1, wherein an impedance converter for performing impedance conversion is provided between the two waveguides. 4. The whole or a part of the beam duct or the whole or a part of the cylindrical antenna has a bellows structure, and the expansion and contraction of the bellows structure is adjusted to insert the cylindrical antenna into the beam duct. 3. The charged particle accelerating cavity according to claim 1, further comprising an antenna insertion amount adjusting mechanism for adjusting an amount of the superconducting cavity resonator and the coupling coefficient between the superconducting cavity resonator and the cylindrical antenna. Power coupler. 5. A power coupler for a charged particle accelerating cavity according to claim 3, further comprising an impedance converter for adjusting the impedance on the side of the superconducting cavity as viewed from the external high frequency power supply and adjusting the tuning condition. 6. A power coupler for a charged particle accelerating cavity according to claim 1, wherein a ceramic vacuum window is provided near a connecting portion from a particle beam orbit axis to a waveguide. 7. A tuner driving mechanism for re-adjusting an insertion amount of a cylindrical antenna in synchronization with a tuner operation and for keeping a coupling coefficient accompanying deformation of a superconducting cavity by the tuner constant. Item 3. A power coupler for a charged particle accelerating cavity according to Item 2. 8. The power coupler for a charged particle accelerating cavity according to claim 1, wherein the cylindrical antenna is cooled by air, water, or a similar cooling medium.