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Issue title: Proceedings of the tenth International Symposium on Applied Electromagnetics and Mechanics ISEM-Tokyo
Article type: Research Article
Authors: Kobayashi, T.a; * | Muroya, Y.a | Watanabe, T.a | Ueda, T.a | Yoshii, K.a | Uesaka, M.a | Katsumura, Y.a | Nakajima, K.b | Zhu, X.b
Affiliations: [a] Nuclear Engineering Research Laboratory, Graduated School of Engineering, University of Tokyo, 2-22 Shirakata-Shirane, Tokai, Naka, Ibaraki, 319-1188, Japan | [b] High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba, Ibaraki, 305-0801, Japan
Correspondence: [*] Corresponding author: Nuclear Engineering Research Laboratory, Graduated School of Engineering, University of Tokyo, 2-22 Shirakata-Shirane, Tokai, Naka, Ibaraki, 319-1188, Japan. Tel.: +81 29 287 8473; Fax: +81 29 287 8471; E-mail: [email protected]
Abstract: For a sub-picosecond pump-and-probe-type radiation chemistry work, a new synchronized electron linac and laser system was installed in Nuclear Engineering Research Laboratory (NERL) of University of Tokyo. The new 0.3 TW laser system with a Ti:Sapphire oscillator (795 nm) and amplifiers generate 300 ps pulses at 10 Hz at first. The laser is splitted into the two beams. The first is compressed to 4 ∼ 11 ps so as to drive the RF-Gun and generate a pump-electron-beam. The second is compressed to 100 fs and used for the probe-light. The drive laser is converted to the third harmonics (265 nm, < 250 μJ). Moreover, a new 15 MW klystron was installed for the linac RF system. The RF power is divided to the gun and the accelerating section. Finally the time jitter between the pump-electron-beam and the probe-laser is designed to be 320 fs (rms). By using the new drive laser system, the charge of 7 nC per bunch was observed at the exit of the gun. Improvement of the vacuum in the gun < 10^{-9} Torr) is most effective to obtain such a high charge beam. After two and a half years operation of the gun, no degradation of QE has been found for the Cu photo-cathode.
DOI: 10.3233/JAE-2002-495
Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 14, no. 1-4, pp. 143-150, 2002
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