1.
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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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2.
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Reducing Back-Bombardment Effect Using Thermionic Cathode in IAE RF Gun
/ Kii, Toshiteru ; Hayakawa, Kazushi ; Masuda, Kai ; Murakami, Shio ; Ohgaki, Hideaki ; Yamazaki, Tetsuo ; Yoshikawa, Kiyoshi ; Zen, Heishun
We have numerically studied on improvement of electron beam macro-pulse properties from thermionic RF gun [1,2]. Beam properties, such as energy spectrum, macro-pulse duration and emittance were measured with a 2 mm diameter slim thermionic dispenser cathode. [...]
2004
External link: Published version from JACoW
In : 26th International Free Electron Laser Conference and 11th FEL User Workshop 2004, Trieste, Italy, 29 Aug - 3 Sep 2004, pp.e-proc. TUPOS21
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3.
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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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4.
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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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5.
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Upgrade Design of KU-FEL Driver Linac Using Photo-Cathode RF-GUN
/ Ohgaki, Hideaki ; Hayakawa, Kazushi ; Kii, Toshiteru ; Masuda, Kai ; Murakami, Shio ; Yamazaki, Tetsuo ; Yoshikawa, Kiyoshi ; Zen, Heishun
An infrared FEL facility is under construction at Institute of Advanced Energy, Kyoto University[1]. The electron beam of 30 MeV has been successfully accelerated by the S-band linac consisted of thermionic RF-gun[2]. [...]
2004
External link: Published version from JACoW
In : 26th International Free Electron Laser Conference and 11th FEL User Workshop 2004, Trieste, Italy, 29 Aug - 3 Sep 2004, pp.e-proc. TUPOS24
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6.
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Beam Property Measurements on the KU-FEL Linac
/ Masuda, Kai ; Hayakawa, Kazushi ; Kii, Toshiteru ; Murakami, Shio ; Ohgaki, Hideaki ; Yamazaki, Tetsuo ; Yoshikawa, Kiyoshi ; Zen, Heishun
An infrared FEL facility is under construction for advanced energy researches [1]. Electron beams of around 30 MeV have been obtained by an S-band 4.5-cell rf gun with a thermionic cathode, and a recently installed 3-m accelerating tube. [...]
2004
External link: Published version from JACoW
In : 26th International Free Electron Laser Conference and 11th FEL User Workshop 2004, Trieste, Italy, 29 Aug - 3 Sep 2004, pp.e-proc. TUPOS23
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7.
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Beam Energy Compensation by RF Amplitude Control for Thermionic RF Gun and Linac Based Mid-infrared FEL
/ Zen, H ; Kii, T ; Kinjo, R ; Masuda, K ; Ohgaki, H ; Sasaki, S ; Shiiyama, T
2008 - 3 p.
External link: Published version from JACoW
In : 11th European Particle Accelerator Conference, Genoa, Italy, 23 - 27 Jun 2008, pp.TUPC113
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8.
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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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9.
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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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10.
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Renewal of KU-FEL Facility
/ Kii, Toshiteru ; Hayakawa, Kazushi ; Masuda, Kai ; Murakami, Shio ; Ohgaki, Hideaki ; Yamazaki, Tetsuo ; Yoshikawa, Kiyoshi ; Zen, Heishun
Users demands to a high power tunable IR laser are increasing in Japan in energy-related science, such as basic study of high-efficiency solar cells, generation of new energy source of alcohol and/or H2 from polluted gas, and separation of DNA and/or RNA. To satisfy these demands, we decided to renew our FEL facility more user friendly and to operate more flexibly. [...]
2004
External link: Published version from JACoW
In : 26th International Free Electron Laser Conference and 11th FEL User Workshop 2004, Trieste, Italy, 29 Aug - 3 Sep 2004, pp.e-proc. TUPOS22
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