• J. Resta-López, J. Dale
  JAI, Oxford
• B. Dalena, D. Schulte, J. Snuverink, F. Stulle, R. Tomás
  CERN, Geneva
• A. Latina
  Fermilab, Batavia

We pre­sent the cur­rent sta­tus of the beam track­ing sim­u­la­tions of the Com­pact Lin­ear Col­lid­er (CLIC) from the exit of the damp­ing ring to the in­ter­ac­tion point, in­clud­ing the ring to main linac (RTML) sec­tion, main linac, beam de­liv­ery sys­tem (BDS) and beam-beam in­ter­ac­tions. This model in­tro­duces re­al­is­tic align­ment sur­vey er­rors, dy­nam­ic im­per­fec­tions and also the pos­si­bil­i­ty to study col­lec­tive ef­fects in the main linac and the BDS. Spe­cial em­pha­sis is put on low emit­tance trans­port and beam sta­bi­liza­tion stud­ies, ap­ply­ing beam based align­ment meth­ods and feed­back sys­tems. The aim is to per­form re­al­is­tic in­te­grat­ed sim­u­la­tions to ob­tain re­li­able lu­mi­nos­i­ty pre­dic­tions.

• F. Stulle, D. Schulte, J. Snuverink
  CERN, Geneva
• A. Latina
  Fermilab, Batavia
• S. Molloy
  Royal Holloway, University of London, Surrey

Over the last months the gen­er­al lay­out of the CLIC main beam RTML has sta­bi­lized and most im­por­tant lat­tices are ex­ist­ing. This al­lowed us to per­form de­tailed stud­ies of tol­er­ances on mag­net­ic stray fields and on mag­net mis­align­ment. Ad­di­tion­al­ly, beam lines could be im­proved in terms of per­for­mance and flex­i­bil­i­ty. We dis­cuss the over­all lay­out as will be de­scribed in the CLIC con­cep­tu­al de­sign re­port, high­light the im­prove­ments which have been made and show re­sults of tol­er­ance stud­ies.

• J. Snuverink, W. Herr, C. Jach, J.B. Jeanneret, D. Schulte, F. Stulle
  CERN, Geneva

The Com­pact Lin­ear Col­lid­er (CLIC) ac­cel­er­a­tor has strong pre­ci­sion re­quire­ments on the po­si­tion of the beam. The beam po­si­tion will be sen­si­tive to ex­ter­nal dy­nam­ic mag­net­ic fields (stray fields) in the nan­otes­la regime. The im­pact of these fields on the CLIC main beam has been stud­ied by per­form­ing sim­u­la­tions on the lat­tices and tol­er­ances have been de­ter­mined. Sev­er­al mit­i­ga­tion tech­niques will be dis­cussed.

• D. Schulte, R. Corsini, B. Dalena, J.-P. Delahaye, S. Döbert, G. Geschonke, A. Grudiev, J.B. Jeanneret, E. Jensen, P. Lebrun, Y. Papaphilippou, L. Rinolfi, G. Rumolo, H. Schmickler, F. Stulle, I. Syratchev, R. Tomás, W. Wuensch
  CERN, Geneva
• E. Adli
  University of Oslo, Oslo

The physics ex­per­i­ments at CLIC will re­quire that the ma­chine scans lower than nom­i­nal cen­tre-of-mass en­er­gy. We pre­sent dif­fer­ent op­tions to achieve this and dis­cuss the im­pli­ca­tions for lu­mi­nos­i­ty and the ma­chine de­sign.