Author: Tauchi, T.
Paper Title Page
MOPME003 Development of Diamond Sensors for Beam Halo and Compton Spectrum Diagnostics After The Interaction Point of ATF2 470
 
  • S. Liu, P. Bambade
    LAL, Orsay, France
  • S. Bai
    IHEP, Beijing, People's Republic of China
  • T. Tauchi, N. Terunuma
    KEK, Ibaraki, Japan
  
  ATF2 is a low en­ergy (1.3GeV) pro­to­type of the final focus sys­tem for ILC and CLIC lin­ear col­lider pro­jects. A major issue at ATF2 and in lin­ear col­lid­ers is to con­trol the beam halo, which con­sists of tails ex­tend­ing far be­yond the Gauss­ian core of the beam. At pre­sent there is no ded­i­cated col­li­ma­tion for the beam halo at ATF2, and the trans­verse dis­tri­b­u­tion near the in­ter­ac­tion point is not well known. The de­vel­op­ment of a sen­sor based on CVD di­a­mond to scan the beam halo in the vac­uum cham­ber a few me­ters after the in­ter­ac­tion point is pre­sented. This sys­tem also aims to de­tect the Comp­ton re­coil elec­trons gen­er­ated by the laser in­ter­fer­om­e­ter (Shin­take mon­i­tor) used to mea­sure the beam size at the in­ter­ac­tion point of ATF2.  
 
MOPME058 DEVELOPMENT OF A CAVITY-TYPE BEAM POSITION MONITORS WITH HIGH RESOLUTION FOR ATF2 604
 
  • S.W. Jang, E.-S. Kim
    KNU, Deagu, Republic of Korea
  • Y. Honda, T. Tauchi, N. Terunuma
    KEK, Ibaraki, Japan
  
  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. Elec­tron­ics for Low-Q IP-BPM will be also de­scribed.  
 
MOPWA052 Short Range Wakefield Measurements of High Resolution RF Cavity Beam Position Monitors at ATF2 792
 
  • J. Snuverink, S.T. Boogert, F.J. Cullinan, Y.I. Kim, A. Lyapin
    JAI, Egham, Surrey, United Kingdom
  • K. Kubo, T. Okugi, T. Tauchi, N. Terunuma, J. Urakawa
    KEK, Ibaraki, Japan
  • G.R. White
    SLAC, Menlo Park, California, USA
  
  Cav­ity beam po­si­tion mon­i­tors (CBPM) have been used in sev­eral ac­cel­er­a­tor fa­cil­i­ties and are planned to be used in fu­ture ac­cel­er­a­tors and light sources. High po­si­tion res­o­lu­tion up to tens of nanome­tres has been achieved, but short range wake­fields are a con­cern, es­pe­cially for small beam emit­tances. This paper pre­sents the wake­field cal­cu­la­tions as well as the first mea­sure­ments of the CBPM-gen­er­ated short range wake­fields per­formed at the Ac­cel­er­a­tor Test Fa­cil­ity (ATF2).  
 
MOPWA058 Cavity Beam Position Monitor at Interaction Point Region of Accelerator Test Facility 2 807
 
  • Y.I. Kim, D.R. Bett, N. Blaskovic Kraljevic, P. Burrows, G.B. Christian, M.R. Davis, A. Lyapin
    JAI, Egham, Surrey, United Kingdom
  • S.T. Boogert
    Royal Holloway, University of London, Surrey, United Kingdom
  • J.C. Frisch, D.J. McCormick, J. Nelson, G.R. White
    SLAC, Menlo Park, California, USA
  • Y. Honda, T. Tauchi, N. Terunuma, J. Urakawa
    KEK, Ibaraki, Japan
  
  Nanome­tre res­o­lu­tion cav­ity beam po­si­tion mon­i­tors (BPMs) have been de­vel­oped to mea­sure the beam po­si­tion and linked to a feed­back sys­tem con­trol the beam po­si­tion sta­bil­ity within few nanome­tres in the ver­ti­cal di­rec­tion at the focus, or in­ter­ac­tion point (IP), of Ac­cel­er­a­tor Test Fa­cil­ity 2 (ATF2). In ad­di­tion, for feed­back ap­pli­ca­tions a lower-Q and hence faster decay time sys­tem is de­sir­able. Two IPBPMs have been in­stalled in­side of IP cham­ber at the ATF2 focus area. To mea­sure the res­o­lu­tion of IPBPMs two ad­di­tional C-band cav­ity BPMs have been in­stalled one up­stream and one down­stream of the IP. One cav­ity BPM has been in­stalled at an up­stream image point of IP. The per­for­mance of the BPMs is dis­cussed and the cor­re­la­tion be­tween IP and image point po­si­tions is pre­sented along with a dis­cus­sion of using these BPMs for po­si­tion sta­bil­i­sa­tion at the IP.  
 
TUOCB203 In Vacuum High Accuracy Mechanical Positioning System of Nano Resolution Beam Position Monitor at the Interaction Point of ATF2 1149
 
  • P. Bambade, O.R. Blanco, F. Bogard, P. Cornebise, S. Wallon
    LAL, Orsay, France
  • T. Tauchi, N. Terunuma
    KEK, Ibaraki, Japan
  
  ATF2 is a low en­ergy (1.3GeV) pro­to­type of the final focus sys­tem for ILC and CLIC lin­ear col­lider pro­jects. A major goal of ATF2 is to demon­strate the abil­ity to sta­bilise the beam po­si­tion at the in­ter­ac­tion point, where the beam can be fo­cused down to about 35 nm. For this pur­pose, a set of new Beam Po­si­tion Mon­i­tors (BPM) has been de­signed, with an ex­pected res­o­lu­tion of about 2 nm. These BPMs must be very well aligned with re­spect to the beam, at the few mi­cron level, to fully ex­ploit their fine res­o­lu­tion. In this paper, the me­chan­i­cal po­si­tion­ing sys­tem which has been de­vel­oped to en­able such a pre­cise align­ment is pre­sented. It is based on a set of eight piezo ac­tu­a­tors with nanome­ter range dis­place­ment res­o­lu­tion, mounted in a new spe­cially made vac­uum cham­ber. Due to the ex­pected res­o­lu­tion of the piezo ac­tu­a­tors, this sys­tem also brings a new func­tion­al­ity, the pos­si­bil­ity to cal­i­brate the BPMs by me­chan­i­cally scan­ning the beam.  
slides icon Slides TUOCB203 [2.276 MB]