Paper | Title | Page |
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MOA01 |
MIR-FEL Oscillator Lasing by Photocathode Operation of LaB6 Thermionic Cathode in KU-FEL | |
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Kyoto University Free Electron Laser (KU-FEL) is an oscillator type mid-infrared FEL having the tunable wavelength range from 5 to 22 micro-m [1]. The first lasing and power saturation of the facility using a 4.5-cell RF gun with a LaB6 thermionic cathode has been achieved in 2008 by overcoming the severe back-bombardment effect in the RF gun [2,3]. For upgrading the FEL performance, a multi-bunch picosecond mode-locked laser has been developed for driving a photocathode in the RF gun [4]. In February 2015, we have achieved first lasing of KU-FEL with photocathode operation of the LaB6 cathode in the 4.5-cell RF gun. The micro-pulse energy of the FEL at the wavelength of 11.7 micro-m with the photocathode operation was around 6.5 times as high as that with the thermionic cathode operation without any other modification of the FEL system. The performance of KU-FEL in the photocathode operation mode and comparison with the thermionic cathode operation will be presented in the conference.
[1] H. Zen, et al., Proc. of FEL2013, p.711, 2013 [2] H. Ohgaki, et al., JJAP, 47, p.8091, 2008 [3] H. Ohgaki, et al., Proc. of FEL08, p.4, 2008 [4] H. Zen, et al., Proc. of FEL2014, p.828, 2015 |
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Slides MOA01 [1.347 MB] | ||
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MOA02 | First Lasing of the Third Stage of Novosibirsk FEL | 1 |
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Novosibirsk FEL facility is based on the first in the world multi-turn energy recovery linac (ERL). It comprises three FELs (stages). FELs on the first and the second tracks were commissioned in 2004 and 2009 respectively and operate for users now. The third stage FEL is installed on the fourth track of the ERL. It includes three undulator sections and 40-meters-long optical cavity. The design tuning range of this FEL is from 5 to 20 microns and the design average power at bunch repetition rate 3.74 MHz is about 1 kW. Recent results of the third stage FEL commissioning are reported. | ||
Slides MOA02 [4.901 MB] | ||
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