Research and development of an electron beam focusing system for a high-brightness X-ray generator
| Autor: | Satoshi Ohsawa, Takeshi Sakai, N. Sakabe, Takashi Sugimura, Mitsuo Ikeda |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
Nuclear and High Energy Physics
Diffraction Structural Biology Ion beam Astrophysics::High Energy Astrophysical Phenomena Electrons law.invention Optics law Instrumentation X-ray generator Physics Beam diameter Radiation business.industry DC electron gun combined-function bending magnet X-Rays Equipment Design Magnet Cathode ray high-flux electron beam Physics::Accelerator Physics M squared Laser beam quality business Beam (structure) Synchrotrons |
| Zdroj: | Journal of Synchrotron Radiation |
| ISSN: | 1600-5775 0909-0495 |
| Popis: | In order to minimize the size of the X-ray source for a U-shaped rotating anticathode X-ray generator, the electron beam is focused over a short distance by a combined-function bending magnet. Simulation predicts that the beam brightness will reach almost 500 kW mm−2 for a 120 keV/75 mA beam. A new type of rotating anticathode X-ray generator, where an electron beam of up to 60 keV irradiates the inner surface of a U-shaped Cu anticathode, has achieved a beam brilliance of 130 kW mm−2 (at 2.3 kW). A higher-flux electron beam is expected from simulation by optimizing the geometry of a combined-function-type magnet instead of the fringing field of the bending magnet. In order to minimize the size of the X-ray source the electron beam has been focused over a short distance by a new combined-function bending magnet, whose geometrical shape was determined by simulation using the Opera-3D, General Particle Tracer and CST-STUDIO codes. The result of the simulation clearly shows that the role of combined functions in both the bending and the steering magnets is important for focusing the beam to a small size. FWHM sizes of the beam are predicted by simulation to be 0.45 mm (horizontal) and 0.05 mm (vertical) for a 120 keV/75 mA beam, of which the effective brilliance is about 500 kW mm−2 on the supposition of a two-dimensional Gaussian distribution. High-power tests have begun using a high-voltage 120 kV/75 mA power supply for the X-ray generator instead of 60 kV/100 mA. The beam focus size on the target will be verified in the experiments. |
| Databáze: | OpenAIRE |
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