Res. Chem. Intermed.
, Vol. 27, No. 7,8, pp. 689–697 (2001)
Performance of compact pulse radiolysis system using
a photocathode RF gun
, TERUNOBU NAKAJYO, AKIRA TSUNEMI,
JINFENG YANG, YASUHIRO OKADA, MASAFUMI YOROZU,
MASAFUMI HIROSE, FUMIO SAKAI and AKIRA ENDO
R&D Center, Sumitomo Heavy Industries, Ltd. (SHI), Yato, Tanashi, Tokyo 188-8585, Japan
Abstract—A compact pulse radiolysis system using a photocathode RF gun was installed at
Sumitomo Heavy Industries. Some performance tests were conducted concerning the electron beam
and the laser pulse. The energy and the per-pulse charge of the electron beam were measured to be
1.75 MeV max. and 1 nC. The uctuation of the charge was restricted within 2%. The pulse widths of
the electron pulse and the analyzing laser pulse were 20 ps and 15 ps, respectively. The timing jitter
between electron pulse and the laser pulse was
5.7 ps. Based on these measurements, the all-over
time resolution can deduced to be about 25 ps.
Recently, development of technologies for ultra-short and extremely low emittance
pulsed electron beam generation has proceeded and as a result, photocathode RF
(radio frequency) electron guns have come to be used as FEL injectors . Also
in the eld of radiation chemistry, this kind of electron gun has begun to be used
in electron pulse radiolysis facilities. The Chemistry Department of Brookhaven
National Laboratory (BNL) was rst to build a pulse radiolysis facility using
a photocathode RF gun (Laser-Electron Accelerator Facility) and successfully
measured the time response of photoabsorption due to a hydrated electron produced
in water by 5 ps electron pulses . The ELYSE project of Université Paris-sud is
This work is performed under the management of a technological research association, the
Femtosecond Technology Research Association (FESTA), supported by New Energy and Industrial
Technology Development Organization (NEDO).
To whom correspondence should be addressed.