Author: Latina, A.
Paper Title Page
MOPO001 Interaction Point Feedback Design and Integrated Simulations to Stabilize the CLIC Final Focus* 475
 
  • G. Balik, L. Brunetti, G. Deleglise, A. Jeremie, L. Pacquet
    IN2P3-LAPP, Annecy-le-Vieux, France
  • A. Badel, B. Caron, R. Le Breton
    SYMME, Annecy-le-Vieux, France
  • A. Latina, J. Pfingstner, D. Schulte, J. Snuverink
    CERN, Geneva, Switzerland
  
  The Com­pact Lin­ear Col­lid­er (CLIC) ac­cel­er­a­tor has strong pre­ci­sion re­quire­ments on off­set po­si­tion be­tween the beams. The beam which is sen­si­tive to ground mo­tion needs to be sta­bi­lized to un­prece­dent­ed re­quire­ments. Dif­fer­ent Beam Based Feed­back (BBF) al­go­rithms such as Orbit Feed­back (OFB) and Beam-Beam Off­set Feed­back (BBOF) have been de­signed. This paper fo­cus­es on the BBOF con­trol which could be added to the CLIC base­line. It has been test­ed for dif­fer­ent ground mo­tion mod­els in the pres­ence of nois­es or dis­tur­bances and uses dig­i­tal lin­ear con­trol with or with­out an adap­tive loop. The sim­u­la­tions demon­strate that it is pos­si­ble to achieve the re­quired per­for­mances and quan­ti­fy the max­i­mum al­lowed noise level. This amount of ad­mit­ted nois­es and dis­tur­bances is given in terms of an equiv­a­lent dis­tur­bance on the po­si­tion of the mag­net that con­trols the beam off­set. Due to the lim­it­ed sam­pling fre­quen­cy of the pro­cess, the con­trol loop is in a very small band­width. The study shows that these dis­tur­bances have to be low­ered by other means in the high­er fre­quen­cy range.  
 
TUPC020 Alignment and Wake Field Issues in the CLIC RTML 1039
 
  • F. Stulle, S. Döbert, A. Latina, D. Schulte
    CERN, Geneva, Switzerland
  
  At main linac in­jec­tion the par­ti­cle beams need to stay with­in tight tol­er­ances for the trans­verse emit­tances and the point­ing sta­bil­i­ty. We study how these tol­er­ances in­flu­ence align­ment re­quire­ments for the RTML com­po­nents and the sta­bil­i­ty of the beams en­ter­ing the RTML. An em­pha­size is put on the boost­er linac and the RF cav­i­ties of the sec­ond bunch com­pres­sion stage since short and long range wake fields might strong­ly in­flu­ence beam dy­nam­ics in these parts of the RTML.