Author: Araki, S.
Paper Title Page
TUPO002 High Flux Polarized Gamma Rays Production: First Measurements with a Four-mirror Cavity at the ATF 1446
 
  • N. Delerue, J. Bonis, I. Chaikovska, R. Chiche, R. Cizeron, M. Cohen, P. Cornebise, R. Flaminio, D. Jehanno, F. Labaye, M. Lacroix, Y. Peinaud, L. Pinard, V. Soskov, A. Variola, Z.F. Zomer
    LAL, Orsay, France
  • T. Akagi, S. Miyoshi
    Hiroshima University, Graduate School of Advanced Sciences of Matter, Higashi-Hiroshima, Japan
  • S. Araki, Y. Funahashi, Y. Honda, T. Omori, H. Shimizu, N. Terunuma, J. Urakawa
    KEK, Ibaraki, Japan
  • E. Cormier
    CELIA, Talence, France
  • T. Takahashi
    Hiroshima University, Graduate School of Science, Higashi-Hiroshima, Japan
  
  Funding: ANR, IN2P3
The next gen­er­a­tion of e+/e- col­lid­ers will re­quire the pro­duc­tion of a very in­tense flux of gamma rays to allow po­lar­ized positrons to be pro­duced in suf­fi­cient quan­ti­ties. To demon­strate that this can be achieved a four-mir­ror cav­i­ty has re­cent­ly been in­stalled at the Ac­cel­er­a­tor Test Fa­cil­i­ty (ATF) at KEK to pro­duce a high flux of po­lar­ized gamma rays by in­verse Comp­ton scat­ter­ing. A four-mir­ror non-pla­nar ge­om­e­try is used to en­sure the po­lar­iza­tion of the gamma rays pro­duced. The main me­chan­i­cal fea­tures of the cav­i­ty are pre­sent­ed. A fibre am­pli­fi­er is used to in­ject about 10W in the high fi­nesse cav­i­ty with a gain of 1000. A dig­i­tal feed­back sys­tem is used to keep the cav­i­ty at the length re­quired for the op­ti­mal power en­hance­ment. First pre­lim­i­nary mea­sure­ments show that on some beam cross­ings the in­ter­ac­tions pro­duce more than 25 pho­tons with an av­er­age en­er­gy of about 24 MeV. Sev­er­al up­grades cur­rent­ly in progress are de­scribed. 		 
 
THPS095 Q-factor of an Open Resonator for a Compact Soft X-ray Source based on Thomson Scattering of Stimulated Coherent Diffraction Radiation 3657
 
  • A.S. Aryshev, S. Araki, M.K. Fukuda, J. Urakawa
    KEK, Ibaraki, Japan
  • V. Karataev
    JAI, Egham, Surrey, United Kingdom
  • G.A. Naumenko
    Tomsk Polytechnic University, Nuclear Physics Institute, Tomsk, Russia
  • A. Potylitsyn, L.G. Sukhikh, D. Verigin
    TPU, Tomsk, Russia
  • K. Sakaue
    RISE, Tokyo, Japan
  
  High-bright­ness and re­li­able sources in the VUV and the soft X-ray re­gion may be used for nu­mer­ous ap­pli­ca­tions in such areas as medicine, bi­ol­o­gy, bio­chem­istry, ma­te­ri­al sci­ence, etc. We have pro­posed a new ap­proach to pro­duce the in­tense beams of X-rays in the range of eV based on Thom­son scat­ter­ing of Co­her­ent Diffrac­tion Ra­di­a­tion (CDR) on a 43 MeV elec­tron beam. CDR is gen­er­at­ed when a charged par­ti­cle moves in the vicin­i­ty of an ob­sta­cle. The ra­di­a­tion is co­her­ent when its wave­length is com­pa­ra­ble to or longer than the bunch length. The CDR waves are gen­er­at­ed in an opened res­onator formed by two mir­rors. In this re­port the sta­tus of the ex­per­i­ment, the first CDR mea­sure­ments at the multi­bunch beam of the LUCX fa­cil­i­ty and gen­er­al hard­ware de­sign will be re­port­ed.