Development status of the photocathode DC gun at JAEA

Iijima, Hokuto; Nagai, Ryoji; Nishimori, Nobuyuki; Hajima, Ryoichi; Minehara, Eisuke

no journal, , 

The next generation light source via an energy recovery linac (ERL) is a powerful tool for various fields such as materials and life science. We are developing an electron gun which is the most important component for the ERL light source. An NEA-AlGaAs cathode is chosen to realize the large current and low emittance of the -beams. A 6-stages symmetric Cockcroft-Walton voltage multiplier provides the 250 keV of acceleration. The main part of the gun consists of Ti chambers which are low outgas materials. Therefore we have achieved Pa in vacuum. A load-lock system, which transfars the cathode between the load-lock, activation and main chambers in the vacuum, is employed. So far we observed the quantum efficiency of 1.5% in the preliminary experiment. The investigation of the making of NEA surface is continued to achieve the high quantum efficiency.

Detection of radionuclides in nuclear waste by using ERL-based -ray source

Hajima, Ryoichi; Kikuzawa, Nobuhiro; Minehara, Eisuke; Hayakawa, Takehito

no journal, , 

no abstracts in English

Intense table-top laser-driven coherent X-ray source and imaging application

Chen, L. M.

no journal, , 

Ablative capillary discharge for laser plasma electron acceleration

Kameshima, Takashi; Kotaki, Hideyuki; Kando, Masaki; Daito, Izuru; Kawase, Keigo; Fukuda, Yuji; Chen, L. M.; Homma, Takayuki; Kondo, Shuji; Bulanov, S. V.; et al.

no journal, , 

Recently, it is noticed to generate plasma by using capillary discharge in order to solve a limit due to focal distance of laser, which is one of problems in laser plasma electron acceleration. Since the higher its plasma density, the lower plasma refraction index is, a laser propagates in plasma with its focal size kept and interacts plasma in same principle of optical fiber by distributing plasma as its outside is more dense than its inside. In 2006, KEK, JAEA, and Chinese Academy Engineering Physics(CAEP) carried out a collaboration experiment, where we succeed in generating 560MeV electron beam by using discharge capillary. The result will be informed.