Study on the back-bombardment effect in the ITC-RF gun for t-ACTS project at Tohoku University

Xiangkun Li, Shigeru Kashiwagi, Masayuki Kawai, Fujio Hinode, Kenich Nanbu, Toshiya Muto, Fusashi Miyahara, Yu Tanaka, Hiroyuki Hama

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

An ITC (independently tunable cells) RF gun is currently used to produce sub-picosecond electron pulses as part of the injector for coherent terahertz radiation at Tohoku University. Both experiments and simulations of particle tracing by GPT have shown that the back-bombardment(B.B.) effect on the LaB6 cathode's surface is serious and should be controlled carefully. To evaluate the temperature increase due to B.B. a 2D model is created for heat transfer inside the cathode. In the 2D model, the back-streaming electrons are treated as external heat source as well as the cathode heater that heats the cathode from its side along with thermal radiation from its surface. The energy deposit of B.B. inside the cathode is calculated by EGS5 or Geant4 by use of the information of back-streaming electrons derived from GPT simulation. The results of simulation on time dependent evolutions of temperature and emission current density of the cathode caused by B.B. were compared with experimental data.

Original languageEnglish
Title of host publicationFEL 2011 - 33rd International Free Electron Laser Conference
Pages503-506
Number of pages4
Publication statusPublished - 2011 Dec 1
Event33rd International Free Electron Laser Conference, FEL 2011 - Shanghai, China
Duration: 2011 Aug 222011 Aug 26

Publication series

NameFEL 2011 - 33rd International Free Electron Laser Conference

Other

Other33rd International Free Electron Laser Conference, FEL 2011
CountryChina
CityShanghai
Period11/8/2211/8/26

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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