Author: Honda, Y.
Paper Title Page
MOPB69
 Development of Four Mirror Pulsed Laser Wire System for ATF-KEK Damping Ring  
 
  • A.A. Rawankar, N. Terunuma, J. Urakawa
    Sokendai, Ibaraki, Japan
  • A.S. Aryshev, Y. Honda, H. Shimizu
    KEK, Ibaraki, Japan
  • Y. You
    TUB, Beijing, People's Republic of China
  
  Funding: Quantum Beam Technology Program of Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT).
Production and handling of a low emittance beam is one of the key technologies for linear colliders. The Accelerator Test Facility (ATF) was constructed at KEK to study low emittance beam physics and to develop the technologies associated with it. In ATF damping ring, the vertical beam size is less than 10 μm. To measure it precisely, a thin and intense laser beam is required. We utilize a pulsed four mirror optical cavity based on IR laser oscillator to fulfill this requirement. With pulsed green laser oscillator, the beam waist will reduce by factor of 2. Therefore, with green laser oscillator, effective electron-photon collision can be observed. Minimum beam waist is obtained in sagittal plane. Special type of mirror alignment scheme is used to make a compact four mirror optical cavity. With Pulsed laser oscillator the electron beam scanning is very fast as compare to CW Laser wire system. Profile of electron beam can be measured in vertical, horizontal and longitudinal direction within a few second. We report the design studies of such compact resonator and scheme to obtain laser beam size less than 6μm in rms. 		 
 
TUPA14
 Development of Cavity-type Beam Position Monitors with High Resolution for ATF2  
 
  • S.W. Jang, A. Heo, E.-S. Kim
    KNU, Deagu, Republic of Korea
  • Y. Honda, T. Tauchi, N. Terunuma
    KEK, Ibaraki, Japan
  • J.G. Hwang
    Kyungpook National University, Daegu, Republic of Korea
  
  We have developed a high resolution beam position monitors for ATF2 at KEK, which is an accelerator test facility for International Linear Collider(ILC). The main goals of ATF2 are achievement of 37nm beam size and 2nm beam position resolution for beam stabilization. For these goals, low-Q IP-BPM(Interaction Point Beam Position Monitor) with latency of 20 ns are being developed. In this paper, we will describe about design of Low-Q IP-BPM, the basics test results as RF test and BPM sensitivity test. An electronics for Low-Q IP-BPM will be also described.