Research and development of an electron beam focusing system for a high‐brightness X‐ray generator
Identifieur interne : 000B60 ( Main/Exploration ); précédent : 000B59; suivant : 000B61Research and development of an electron beam focusing system for a high‐brightness X‐ray generator
Auteurs : Takeshi Sakai ; Satoshi Ohsawa ; Noriyoshi Sakabe ; Takashi Sugimura ; Mitsuo IkedaSource :
- Journal of Synchrotron Radiation [ 1600-5775 ] ; 2011-01-01.
English descriptors
- KwdEn :
- MESH :
- instrumentation : Synchrotrons.
- Electrons, Equipment Design, X-Rays.
Abstract
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.
Url:
DOI: 10.1107/S0909049510029948
Affiliations:
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<front><div type="abstract" xml:lang="en">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.</div>
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<tree><noCountry><name sortKey="Ikeda, Mitsuo" sort="Ikeda, Mitsuo" uniqKey="Ikeda M" first="Mitsuo" last="Ikeda">Mitsuo Ikeda</name>
<name sortKey="Ohsawa, Satoshi" sort="Ohsawa, Satoshi" uniqKey="Ohsawa S" first="Satoshi" last="Ohsawa">Satoshi Ohsawa</name>
<name sortKey="Sakabe, Noriyoshi" sort="Sakabe, Noriyoshi" uniqKey="Sakabe N" first="Noriyoshi" last="Sakabe">Noriyoshi Sakabe</name>
<name sortKey="Sakai, Takeshi" sort="Sakai, Takeshi" uniqKey="Sakai T" first="Takeshi" last="Sakai">Takeshi Sakai</name>
<name sortKey="Sugimura, Takashi" sort="Sugimura, Takashi" uniqKey="Sugimura T" first="Takashi" last="Sugimura">Takashi Sugimura</name>
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