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Tanaka, H.

Paper Title Page
TUPMA042 Beam Parameters of the SCSS Prototype Accelerator Designed by PARMELA and Comparison with Measured Values 169
 
  • T. Hara, H. Kitamura, T. Shintake, K. Togawa
    RIKEN Spring-8 Harima, Hyogo
  • H. Tanaka
    JASRI/SPring-8, Hyogo-ken
  • T. Tanikawa
    University of Hyogo, Hyogo
  
  The 250 MeV prototype facility of the SCSS X-FEL project was constructed in the Octorber 2005 and the machine commissioning was started in May 2006. One month later, we have succeeded in confirming the amplification of the synchrotron radiation. The electron beam parameters, such as peak current and emittance, have been designed and estimated using PARMELA. In contrast to other X-FEL projects, the SCSS injector uses a thermionic pulsed electron gun [1]. Compared with RF photocathode guns, the thermionic gun is stable and easy to handle. Its peak current, however, is smaller, and the compression of the electron bunch is necessary at early stage of the low beam energy injector. In this report, we compare the simulation and measured values, such as a bunch length and projected emittance, on the SCSS prototype accelerator. The measured beam parameters, after the bunch compression procedure and emittance degradation due to space charge, show fairly good agreement with the simulation.

[1] K. Togawa, et al., “Emittance Measurement on the CeB6 Electron Gun for the SPring-8 Compact SASE Source”, Proceedings of the 2004 FEL Conference, (2004)351-354, URL: http://www. JACoW.org.

 
TUPMA049 Development of an Injector to Generate a Very Short Bunch for a Super Coherent Terahertz Light Source Project 178
 
  • T. Tanaka, K. Akiyama, H. Hama, F. Hinode, K. Kasamsook, M. Kawai, T. Muto, K. Nanbu, M. Yasuda
    Tohoku University, School of Scinece, Sendai
  • N. Kumagai, H. Tanaka
    JASRI/SPring-8, Hyogo-ken
  
  A project to develop a coherent Terahertz (THz) light source is in progress at Laboratory of Nuclear Science, Tohoku University. The coherent synchrotron light in the THz region is emitted from electron bunches with a very short bunch less than 100 fs (rms) generated by a thermionic RF gun and a sophisticated bunch compressor. As an injector of this ring, we have developed an independently tunable cells (ITC) RF gun and a magnetic bunch compressor. The longitudinal phase space extracted from the ITC-RF gun can be manipulated by feeding RF microwave to cells independently. To generate a short bunch with a significant bunch charge, a magnetic compressor is used downstream from the gun. Two kinds of bunch compressors have been studied. From simulation of an injector, we have got a very short bunch length about 42 fs (rms). A prototype of the gun has been manufactured. Results of low power tests of the gun will be presented.