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Naito, T.

Paper Title Page
TUPCH058 Very Small Beam Size Measurement by Reflective SR Interferometer at KEK-ATF 1142
 
  • T. Naito, T. Mitsuhashi
    KEK, Ibaraki
  
  An SR interferometer with the Herschelian reflective optics has been developed for the measurement of several um beam size. The chromatic aberration of the optical system applied in the SR interferometer limits the resolution of SR interferometer. We used objective lens of the SR interferometer by a focusing mirror. For the convenience of observation of the interferogram, we applied Herschelian arrangement of the optics. The measured vertical beam size was less than 5um and the estimated vertical emittance was 1x10-11m at the KEK-ATF damping ring.  
THPCH067 Coherent Synchrotron Radiation Studies at the Accelerator Test Facility 2940
 
  • S. De Santis, J.M. Byrd
    LBNL, Berkeley, California
  • A. Aryshev, T. Naito, J. Urakawa
    KEK, Ibaraki
  • M.C. Ross
    SLAC, Menlo Park, California
  
  Coherent Synchrotron Radiation (CSR) has been the object of recent experiments and is a topic of great importance for several accelerator currently in their design phase (LCLS, ILC, CIRCE). We present the results of several experimental sessions performed at the Advanced Test Facility - KEK (ATF). An infrared bolometer was used to detect the emitted infrared radiation in the 1-0.05 mm wavelength range as a function of several beam parameters (beam current, RF power, extraction timing, photoinjector laser phase). The beam energy spread was also recorded. We found that the mismatch between injected and equilibrium beam is the source of the coherent signal detected concurrently with the bunch injection.  
THPCH103 Design and Testing of Gproto Bunch-by-bunch Signal Processor 3038
 
  • D. Teytelman, R. Akre, J.D. Fox, A. Krasnykh, C.H. Rivetta, D. Van Winkle
    SLAC, Menlo Park, California
  • A. Drago
    INFN/LNF, Frascati (Roma)
  • J.W. Flanagan, T. Naito, M. Tobiyama
    KEK, Ibaraki
  
  A prototype programmable bunch-by-bunch signal acquisition and processing channel with multiple applications in storage rings has been developed at SLAC. The processing channel supports up to 5120 bunches with bunch spacings as close as 1.9 ns. The prototype has been tested and operated in five storage rings: SPEAR-3, DAFNE, PEP-II, KEKB, and ATF damping ring. The testing included such applications as transverse and longitudinal coupled-bunch instability control, bunch-by-bunch luminosity monitoring, and injection diagnostic. In this contribution the prototype design will be described and its operation will be illustrated with the data measured at the abovementioned accelerators.