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Reducing Energy Degradation Due to Back-bombardment Effect with Modulated RF Input in S-band Thermionic RF Gun / Kii, Toshiteru ; Nakai, Yoko ; Fukui, Toshio ; Zen, Heishun ; Kusukame, Kohichi ; Okawachi, Norihito ; Nakano, Masatsugu ; Masuda, Kai ; Ohgaki, Hideaki ; Yoshikawa, Kiyoshi et al.
2007 - Published in : AIP Conf. Proc.: 879 (2007) , pp. 248-251 External link: Published version from AIP
In : 9th International Conference On Synchrotron Radiation Instrumentation, Daegu, Korea, 28 May - 2 Jun 2006, pp.248-251

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Quantitative Evaluation of Transverse Phase Space Tomography / Zen, H ; Fukui, T ; Kii, T ; Kusukame, K ; Masuda, K ; Nakai, Y ; Ohgaki, H ; Yamazaki, T ; Yoshikawa, K
Transverse phase space tomography [1] using a quadrupole magnet and a beam profile monitor is very useful for emittance measurements especially for non-Gaussian beams, since this method directly gives transverse phase space distributions. We have tried to apply the method to measure the beam emittance of our FEL driver Linac [2]. [...]
2005 External link: Published version from JACoW
In : 27th International Conference on Free Electron Lasers, Palo Alto, CA, USA, 21 - 26 Aug 2005, pp.592

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Particle Simulations of a Thermionic RF Gun with Gridded Triode Structure for Reduction of Back-Bombardment / Kusukame, K ; Fukui, T ; Kii, T ; Masuda, K ; Nakai, Y ; Ohgaki, H ; Yamazaki, T ; Yoshikawa, K ; Zen, H
Thermionic RF guns show advantageous features compared with photocathode ones such as easy operation and much higher repetition rate of micropulses, both of which are suitable for their application to high average power FELs. They however suffer from the back-bombardment effect [1], i.e., in conventional RF guns, electrons are extracted from cathode also in the latter half of accelerating phase and tend to back-stream to hit the cathode, and as a result the macropulse duration is limited down to severalμsec Against this adverse effect in thermionic RF guns, introduction of the triode structure has been proposed [2], where the accelerating phase and amplitude nearby the cathode can be controlled regardless of the phase of the first accelerating cell in the conventional RF gun. [...]
2005 External link: Published version from JACoW
In : 27th International Conference on Free Electron Lasers, Palo Alto, CA, USA, 21 - 26 Aug 2005, pp.588

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Electron Beam Energy Compensation by Controlling RF Pulse Shape / Kii, T ; Fukui, T ; Kusukame, K ; Masuda, K ; Nakai, Y ; Ohgaki, H ; Yamazaki, T ; Yoshikawa, K ; Zen, H
We have studied on improvement of electron beam macropulse properties from a thermionic RF gun. Though a thermionic RF gun has many salient features, there is a serious problem that back-bombardment effect worsens quality of the beam. [...]
2005 External link: Published version from JACoW
In : 27th International Conference on Free Electron Lasers, Palo Alto, CA, USA, 21 - 26 Aug 2005, pp.584

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Numerical Study on the Undulator in KU-FEL / Fukui, T ; Kii, T ; Kusukame, K ; Masuda, K ; Nakai, Y ; Ohgaki, H ; Yamazaki, T ; Yoshikawa, K ; Zen, H
We have constructed system for 3~20μmeter FEL oscillation for bio/chemical energy researches which consists of a thermionic RF gun and a 3-meter accelerating tube at the Institute of Advanced Energy, Kyoto University. [1] A 30 MeV electron beam has been successfully accelerated and studies on the beam characterization have also been carried out. [...]
2005 External link: Published version from JACoW
In : 27th International Conference on Free Electron Lasers, Palo Alto, CA, USA, 21 - 26 Aug 2005, pp.195

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2	Kusukame, Kohichi

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