Author: Alabau-Gonzalvo, J.
Paper Title Page
TUPC127 Optical Transition Radiation System for ATF2 1317
 
  • J. Alabau-Gonzalvo, C. Blanch Gutierrez, A. Faus-Golfe, J.J. García-Garrigós
    IFIC, Valencia, Spain
  • J. Cruz, D.J. McCormick, G.R. White, M. Woodley
    SLAC, Menlo Park, California, USA
  
  Funding: Funding Agency: FPA2010-21456-C02-01 Work supported in part by Department of Energy Contract DE-AC02-76SF00515
In this paper we pre­sent the first mea­sure­ments per­formed dur­ing the fall 2010 and early 2011 runs. Soft­ware de­vel­op­ment, sim­u­la­tions and hard­ware im­prove­ments to the Mul­ti-Op­ti­cal Tran­si­tion Ra­di­a­tion Sys­tem in­stalled in the beam di­ag­nos­tic sec­tion of the Ex­trac­tion (EXT) line of ATF2 are de­scribed. 2D emit­tance mea­sure­ments have been per­formed and the sys­tem is being rou­tine­ly used for cou­pling cor­rec­tion. Re­al­is­tic beam sim­u­la­tions have been made and com­pared with the mea­sure­ments. A 4D emit­tance pro­ce­dure, yet to be im­ple­ment­ed, is also dis­cussed. A de­mag­ni­fi­er lens sys­tem to im­prove the beam find­ing pro­ce­dure has been de­signed and will be im­ple­ment­ed in a fu­ture run. Fi­nal­ly, we dis­cuss fur­ther ver­i­fi­ca­tion work planned for the next run pe­ri­od of ATF. 		 
 
TUPC128 Transverse Beam Jitter Propagation in Multi-bunch Operation at ATF2 1320
 
  • J. Resta-López, J. Alabau-Gonzalvo
    IFIC, Valencia, Spain
  • P. Burrows, G.B. Christian
    JAI, Oxford, United Kingdom
  • B. Constance
    CERN, Geneva, Switzerland
  
  Pulse-to-pulse orbit jit­ter, if not con­trolled, can dras­ti­cal­ly de­grade the lu­mi­nos­i­ty in fu­ture lin­ear col­lid­ers. The sec­ond goal of the ATF2 pro­ject at the KEK ac­cel­er­a­tor test fa­cil­i­ty is to sta­bi­lize the ver­ti­cal beam po­si­tion down to ap­prox­i­mate­ly 5% of the nom­i­nal rms ver­ti­cal beam size at the vir­tu­al in­ter­ac­tion point (IP). This will re­quire con­trol of the orbit to bet­ter than 1 mi­crom­e­ter at the en­trance of the ATF2 final focus sys­tem. In this paper, by means of com­put­er sim­u­la­tions, we study the ver­ti­cal jit­ter prop­a­ga­tion along the ATF2 from the start of the ex­trac­tion line to the IP. For this study pulse-to-pulse ver­ti­cal jit­ter mea­sure­ments using three stripline beam po­si­tion mon­i­tors are used as ini­tial in­puts. This study is per­formed for the case of a bunch-train with three bunch­es, but could eas­i­ly be ex­tend­ed for a larg­er num­ber of bunch­es. The cases with and with­out in­tra-train orbit feed­back cor­rec­tion in the ex­trac­tion line of ATF2 are com­pared.