JP2883285B2 - Industrial photon generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The disclosed technology belongs to the technical field of a practically usable industrial photon device of a ring type accelerator for generating free electron laser (FEL), radiation light (SR light) and the like.

[0002]

2. Description of the Related Art As is well known, the development of industry is highly developed with the development of science, but high-intensity light such as SR light and FEL is used for medical, chemical, bio, group separation, nuclear fusion, etc. It is increasingly expected to be used in the field of physics, and there is therefore a strong demand for the development and commercialization of industrial devices for photons that generate them.

There are two types of photon generators for research and other experiments, such as a type using an electron storage ring and a linear accelerator (referred to as a linac-type high-brightness light generator). Devices for generating electrons and using the electrons to generate high-intensity light in the infrared, far-infrared, and submillimeter waves have been developed and are currently used in research institutions in foreign countries and the like.

In the linac-type high-brightness light generator 1 shown in FIG. 7, in order to generate high-brightness light in the ultraviolet region, when a normal undulator is used, a high luminosity of 300 MeV or more is used. An undulator (wiggler) that requires equipment to accelerate to energy
2 are required to be many and long, and therefore, the equipment becomes large in size, resulting in a disadvantage in management operation. Naturally, running costs including initial costs and maintenance costs are included. The disadvantage is that the quality (electron dispersion and emittance) and stability of electrons must be improved, and the cost of the device increases.

On the other hand, in a ring-type high-intensity light generator 1 'using an electron storage ring type shown in FIG. 8, for example, high-intensity light generated in the case shown in Japanese Patent Application No. 3-84391 is disclosed. Research and development involving generation in the wavelength region of 1 μm or less, particularly in the ultraviolet region, are being promoted at various research institutions and companies at the research level and the experimental level.

However, in order to obtain a wavelength of 1 μm or more in the ring-type high-brightness light generator 1 ′, the energy of the accumulated electrons is reduced to 100 MeV or less, so that the energy of the electron is reduced to about 10 ⁻¹⁰ to 10 ⁻¹¹ Torr. Even in a high vacuum, the electron beam cannot be maintained for a long time, and generation of the electron beam is substantially impossible. (In the ring-type high-brightness light generation device 1 ′, electrons from an injector such as a small linac are used. The deflection electromagnet 4 and the quadrupole electromagnet 5 ′ via the septum electromagnet 6 via the deflection electromagnet 4 and the quadrupole electromagnets 17 and 18 of the beam transport system.
And an undulator (wiggler) 2 ′ which is orbited around a ring-shaped electron beam orbit 11 having an RF cavity 7 and a kicker electromagnet 9 and is provided in the middle of the electron beam orbit 11. The high-intensity light having a wavelength of about the ultraviolet region is generated by resonance oscillation by a non-reflective mirror.)

[0007]

As shown in FIG. 7, even in the linac-type high-intensity light generating device 1, the acceleration tubes 3, 3,...
And a long linac space is unavoidable, so that the entire device becomes bulky, and even in the ring-type high-intensity light generator 1 ', the electron beam orbit 11 It is necessary to equip the outside with an injector such as a linac and ancillary equipment, and the entire equipment must be large in space. Naturally, the initial construction is complicated, difficult and expensive. There is an advantage. Thus, the linac-type high-intensity light generator 1 and the ring-type high-intensity light generator 1 'are large in size, and have a large difference in energy level. There is a difference in wavelength, so the device is structurally small, and there is no device that can generate high-intensity light from ultraviolet to submillimeter waves with the same small device. Is strongly desired This has been a bottleneck for the emergence of industrial photons, and there are obstacles that have been used as large-scale construction of linac-type or ring-type accelerators as actual industrial photon devices.

The electron beam source for FEL oscillation needs to have conditions such as relativistic energy, small energy spread, small emittance, and large current as described later. In addition, it is necessary to provide a long linear portion as a resonance portion of the undulator (wiggler).

However, when electrons of several hundred MeV are generated by a linac to reduce the spread of energy, a high phase stable luminance of RF supplied to the accelerator is required. Is very expensive, and in order to obtain a beam with high energy and a small energy spread, a racetrack type ring accelerator 1 'as shown in FIG.
There was inconvenience inevitably.

[0010]

The object of the invention of this application is to make the linac-type accelerator and the ring-type accelerator based on the prior art described above incompatible with each other in the difference in the height (length of light wavelength) of the electron beam energy. In addition, it is a technical problem to solve the problem of the accelerator, which is a bottleneck for industrial and practical use, which is physically large and costly,
In the case of low energy (ie, a long wavelength of 10 MeV to 150 MeV), the direct electron beam from the injector from the linac is used, while in the case of high energy of 100 MeV (short wavelength) or more, Using the electron beam accumulated in the ring, a stable high-quality electron beam of about 10 MeV to 1 GeV is passed through the same undulator (wiggler) installed in the electron storage ring. It is easy to perform the initial construction maintenance, etc., and it is possible to generate high brightness light from the ultraviolet region to submillimeter wave, so it is excellent for laser technology application fields in various industries. It is intended to provide an industrial photon generator.

Incidentally, reflection mirrors are appropriately provided on both sides of the undulator (wiggler), and an FEL can also be obtained by performing an appropriate alignment adjustment.

[0012]

As described above, when the energy is low (the wavelength is long), the electron beam directly from the linac is used, and when the energy is high, the electron beam stored in the ring is used to obtain high quality. By passing the electron beam through the same undulator (wiggler) installed in the ring, it is theoretically possible to create a small industrially effective photon generator using the advantages of both. In this case,
In addition to improving the quality and stability of electrons, it is necessary to reduce the optical proportional coefficient for determining the beam size called energy dispersion called dispersion in the undulator section.

[0013] This is because the FEL gain is proportional to the electron beam density, and this is due to the requirement to reduce the beam size in the resonance part, which is a major factor in improving the performance. Even when the beam from the linac is used directly by the various calculations for the racetrack type ring accelerator, the dispersion is shown in FIG.
It can be seen that it can be set to 0 as shown by the dotted line in
As shown in FIG. 4, the same undulator in which a small, compact, and high-quality electron beam is installed in the electron storage ring by combining a linac-type accelerator and a ring-type accelerator because it is similar to the case of using a ring-type accelerator. It was hoped that it would be possible to generate high-intensity light from the UV range to submillimeter waves by passing (through the wiggler) (like passing through the center line).

The reflection mirror provided at both ends of the undulator (wiggler) can also obtain the FEL by performing appropriate alignment adjustment.

[0015]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the structure of the invention of the present application, which has the above-mentioned claims and aims at solving the above-mentioned problems, is small, compact, excellent in operability, and has an administrative control. In order to generate high-intensity light such as FEL and SR light with an industrial photon generator that is easy to operate, an injector such as a linac is provided separately from the orbit of the electron ring, especially inside the orbit ring of the electron beam. To reduce the size of the device, improve operability, and pass the low-energy electrons and the ring-stored high-energy electrons from the injector through the same undulator (wiggler) to generate high-band, predetermined high-brightness light. In this case, a septum electromagnet is provided in the transport section between the injector and the electron beam orbit so that off-axis and on-axis can be switched. Alternatively, the electron beam from the injector provided with two or more two-pole electromagnet track portion extending in undulator (wiggler) of the electron beam orbit so as to pass over the orbit of the electron storage ring.

In detail, when passing through the orbit by an undulator using a septum electromagnet, two incident systems (off-axis and on-axis) are installed and used as shown in FIG.

However, when accumulating the electron beam, the on-axis magnet coil is moved in the vertical direction or the horizontal direction, or the accumulated beam is not affected.

As shown in FIG. 2, an off-axis electron beam is applied by using two or more correcting dipole electromagnets so as to pass through the center of an undulator (wiggler). 10MeV using undulator (wiggler) for both linac type and ring type
By passing a stable high-quality electron beam of up to about 1 GeV, it is possible to generate high-intensity light from the ultraviolet region to the submillimeter wave. At that time, naturally, both ends of the undulator (wiggler) It is also possible to obtain an FEL by providing a reflection mirror for the alignment adjustment.

The high brightness light from the undulator (wiggler) is expressed by the following equation.

[0020]

[Number 1] _{λ = λ w (1 + K} 2/2) / 2γ 2 K = 93.4Bλ w where, lambda _w is the magnetic field period length, B is the magnetic field intensity of the peak, gamma
Is the electron energy divided by the rest mass of the electron.

The wavelengths generated when the undulator (wiggler) period is 0.1 m and the K values are 1 and 3 are as shown in FIG. 6, and the high luminance in the region from the ultraviolet region to the submillimeter wave is shown. It turns out that light is obtained.

[0022]

1 to 6 show an embodiment of the invention of this application.
This will be described below.

7 and 8 will be described using the same reference numerals.

In the embodiment shown in FIG. 1, reference numeral 1 'denotes an accelerator of an industrial photon generator which forms the gist of the invention of the present application. And an injector 9 as an injector for electrons with respect to the orbit of the electron beam, and a transport portion 10 for injecting electrons from the orbit of the electron beam from the injector 9, resulting in the incidence Device 9 is provided inside the race track type electron beam orbit 11 of the ring type accelerator 8,
It is compact in space and easy to assemble, as well as easy to maintain and manage.

In the ring type accelerator 8, the bending electromagnet 4, the quadrupole electromagnets 5, 5 'for the ring, and the RF cavity 7 are provided, and a part of the linear portion of the electron beam orbit 11 is provided. Is provided with an undulator (wiggler) 2, and a reflection mirror 12 for resonance,
The kicker electromagnet 13 is provided at a position substantially opposite to the septum electromagnet 22 and the ring.

In addition, for use as a linac type, a beam catcher 14 is provided on the extension of the electron beam orbit of the bending electromagnet 4 so as to prevent the leakage of radioactivity and the outflow of electrons out of the system.

The linac injector 9 is provided with an electron gun 15 and a first-stage beam accelerator 16.
Behind them, transport quadrupole electromagnets 17 and 18 are provided.

Further, a predetermined number of accelerating tubes 19, 19 are arranged adjacent to each other over the transport section 10, and the quadrupole electromagnets 17, 18 of the transport section 10 are arranged in an overlapping manner.

In addition, the transport quadrupole electromagnet 18
In the rear part, a dipole electromagnet 20 for beam transport is disposed, and in the front part thereof, transport quadrupole electromagnets 17 and 18 for on-axis and off-axis which directly penetrate the orbit of the ring-shaped electron beam. Septum electromagnets 21 and 22 are juxtaposed on the on-axis side and off-axis side of the electron trajectory incident from the injector 9 in an overlapping manner.

Thus, as in the embodiment shown in FIG. 1, in order for the electron beam to pass through the central orbit of the orbital orbit 11 of the electron beam of the ring, the on-axis is different from that stored in the ring. The on-axis septum electromagnet 21 is provided so that the incident electron beam passes through the center orbit of the orbit of the ring.
When the electron beam is stored in the ring 8, the electron beam moves in the vertical direction or the horizontal direction so as not to affect the stored beam, or has a septum coil support structure that does not originally affect the stored beam.

On the other hand, the off-axis septum electromagnet 22
In this case, the off-axis incident electron beam that has passed is placed on the central orbit of the electron beam orbit 11 by the kicker electromagnet 13 so as to resonate in the undulator (wiggler) 2.

The undulator (wiggler)
It is better that the electron beam passing through 2 has a smaller function related to the size of the electron beam, which is proportional to the energy dispersion of electrons, called dispersion, and as described above, FIG.
FIG. 5 shows a β function and a dispersion, which are parameters relating to an electron beam as a linac-type high-brightness light generator as an electron storage ring,
As shown in the figure, both dispersions become 0 in the undulator (wiggler) 2, which indicates that the invention of this application can be sufficiently manufactured even at the present time. 3 was carried out in the arrangement of the electromagnet of the embodiment in FIG.

Next, in the embodiment shown in FIG. 2, an injector 9 as an injector is provided in the electron beam orbit 11 of the ring accelerator, and an off-axis electromagnet 22 is provided in the transport unit 10 in FIG. The correction dipole electromagnets 23 and 23 are arranged in the path of the off-axis electromagnet 22 and the undulator (wiggler) 2 in the mode part, so that the off-axis electron beam is focused on the center of the undulator (wiggler) 2. This is a mode in which it is made to function so as to pass through, and other mechanism parts are the same as those in FIG.

Also in this embodiment, since the injector 9 is disposed inside the race track type electron beam orbit 11 of the ring accelerator 8, the size and size are reduced, and the apparatus is easily operated. Are similar.

Then, the kicker electromagnet 13 and the off-axis septum electromagnet 22 traverse the electron beam orbit 11.
After being put on the top, the function of the injector 9 basically ends.

Next, in the embodiment shown in FIG. 3, in order to make the advantages of the above two embodiments even more advantageous, the incident light provided in the race track type electron beam orbit 11 of the ring type accelerator 8 is provided. This is a mode in which a microtron 24 is interposed between the beam transport dipole magnet 20 and the buncher 16 as an accelerator in the injector 9 as a detector, and the apparatus structure is made smaller and more compact. Yes, it has the advantages of easy operation management control, easy maintenance, and low cost, as well as initial construction.

Reference numeral 14 denotes a beam catcher for preventing the electron beam from leaking outside when used as a linac type FEL.

The lower part of FIGS. 4 and 5 is a schematic diagram cut open along the orbit of the electron beam of the ring accelerator, and has a corresponding relationship with the upper graph data.

It should be noted that the embodiments of the invention of this application are not limited to the above embodiments. For example, the embodiment in which the injector is provided separately from the electron storage ring is described in the above embodiments. Not only the mode arranged inside the electron energy ring, but also the outside (top and bottom, left and right in plan view)
In the embodiment of FIG. 1, the on-axis septum electromagnet and the off-axis septum electromagnet are separately provided to enable electromagnetic switching.
Switching the beam transport portion 10 provided at the rear of the acceleration tube to both the on-axis line and the off-axis line, for example, moving the whole using a bellows tube,
Various modes such as a switchable type can be adopted.

[0040]

As described above, according to the invention of this application, high brightness such as SR light and FEL, which are expected to be greatly used in the physical fields such as medicine, chemistry, biotechnology, group separation, and nuclear fusion, are basically expected. In an industrial photon device that generates light, it is basically small in size, and it is easy to perform initial construction and maintenance.
It is easy to manage, control, and operate, and has an excellent effect that it can be generated using the same undulator (wiggler) over a wide band from the ultraviolet region to the submillimeter wave.

The low energy (10 MeV to 1)
In the case of long wavelengths such as 50 MeV), an electron beam directly from the linac injector can be used, while 100 MeV
For large energies above V (short wavelength),
10MeV to 1Ge using the electron beam accumulated in the ring
An excellent effect is obtained in that electron energy for improving the stability of about V (energy dispersion and emittance) can be supplied.

As described above, according to the invention of this application, the disadvantages of the conventional linac-type accelerator and the ring-type accelerator are compensated for, and small, efficient, low-cost, wide-band, high-brightness light with good operability is generated. An excellent effect that enables the appearance of an industrial photon generator is achieved.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of an embodiment of the present invention.

FIG. 2 is a schematic plan view of another embodiment.

FIG. 3 is a schematic plan view of another embodiment of the present invention.

FIG. 4 is a graph showing a relationship between a β-function, which is a parameter relating to an electron beam as a ring-type high-brightness light generation device, and a dispersion in the embodiment of FIG.

FIG. 5 is a data graph showing the possibility of the invention of this application in which the dispersion becomes 0 at the undulator (wiggler) portion when used as a linac-type high-brightness light generator in the same figure showing the relationship. .

FIG. 6: cycle of undulator (wiggler) 0.1 m
FIG. 4 is a characteristic graph of a wavelength generated when K values are 1 and 3.

FIG. 7 is a schematic side view of a linac-type accelerator based on the prior art.

FIG. 8 is a schematic plan view of a ring accelerator based on the conventional technology.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 linac-type high-intensity light generator 1 'ring-type high-intensity light generator 2, 2' undulator (wiggler) 3 accelerator tube 4 deflection magnet 5, 5 'quadrupole electromagnet 6 septum electromagnet 7 RF cavity 8 ring-type accelerator ( 9 electron injector 10 beam transport (beam transport system) 11 electron beam orbit (center) orbit 12 mirror for resonator (for FEL) 13 kicker electromagnet 14 beam catcher 15 electron gun 16 first stage beam accelerator ( 17,18 Transport quadrupole electromagnet 19 Accelerator tube 20 Transport deflection magnet 21 On-axis septum electromagnet 22 Off-axis septum electromagnet 23 Auxiliary bipolar electromagnet 24 Microtron

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shinji Hamada 1-1, Kawasaki-cho, Akashi-shi, Hyogo Kawasaki Heavy Industries, Ltd. Inside the Akashi Plant (72) Inventor Tetsuo Yamazaki 1-1-4 Umezono, Tsukuba, Ibaraki Kogyo Institute of Technology, Electronic Technology Research Institute (72) Inventor Iekazu Yamada 1-1-4, Umezono, Tsukuba, Ibaraki Prefectural Institute of Technology, Electrification Researcher, Electronic Technology Research Institute Eiji Tanabe (56) References JP-A-63-224287 JP, A) JP-A-61-279048 (JP, A) JP-A-64-21900 (JP, A) A. Piestrup. "Multiple beam free-el electron lasers and optical klystrons", Appl. Phys, Let t. , Vol. 39, No. 9.1 Nov. 1981, pp. 696-698 (58) Field surveyed (Int. Cl. ⁶ , DB name) H05H 13/04 H01S 3/30 JICST file (JOIS)

Claims (9)

(57) [Claims] 1. An F having an undulator (wiggler)
In the industrial photon generator of the ring accelerator for EL and SR light generation, both the low energy electrons from the injector arranged separately from the electron storage ring and the high energy electrons stored in the electron storage ring are described above. An industrial photon generator characterized in that high luminance light is generated by passing through the same undulator (wiggler). 2. The industrial photon generator according to claim 1, wherein the wavelength of said high-brightness light ranges from an ultraviolet region to a submillimeter wave. 3. An industrial photon generator according to claim 1, wherein said injector is disposed inside an electron storage ring. 4. The industrial photon generator according to claim 3, wherein the energy of the electrons generated by said injector is set to 10 MeV to 150 MeV. 5. The industrial photon generator according to claim 3, wherein electron energy generated by said electron storage ring is 1 GeV or less. 6. The industrial photon generator according to claim 1, wherein said injector is a microtron. 7. A septum electromagnet other than a septum electromagnet is provided for passing an electron beam from a linac type generator on a central trajectory of an electron storage ring. Item 2. An industrial photon generator according to item 1. 8. The industrial photon generator according to claim 1, wherein said septum electromagnet is movable and adjustable. 9. A dipole electromagnet is placed on an orbit to an undulator (wiggler) to pass an electron beam from the linac-type generator on a central orbit of an electron storage ring.
The industrial photon generator according to claim 1, wherein at least one is provided.