Author: Faus-Golfe, A.
Paper Title Page
TUPC011 Striplines for CLIC Pre-Damping and Damping Rings* 1012
 
  • C. Belver-Aguilar, A. Faus-Golfe
    IFIC, Valencia, Spain
  • M.J. Barnes, G. Rumolo
    CERN, Geneva, Switzerland
  • F. Toral
    CIEMAT, Madrid, Spain
  • C. Zannini
    EPFL, Lausanne, Switzerland
  
  The Com­pact Lin­ear Col­lid­er (CLIC) study ex­plores the scheme for an elec­tron-positron col­lid­er with high lu­mi­nos­i­ty and a nom­i­nal cen­ter-of-mass en­er­gy of 3 TeV: CLIC would com­ple­ment LHC physics in the mul­ti-TeV range. The CLIC de­sign re­lies on the pres­ence of Pre-Damp­ing Rings (PDR) and Damp­ing Rings (DR) to achieve, through syn­chrotron ra­di­a­tion, the very low emit­tance need­ed to ful­fil the lu­mi­nos­i­ty re­quire­ments. The spec­i­fi­ca­tions for the kick­er sys­tems are very chal­leng­ing and in­clude very low beam cou­pling impedance and ex­cel­lent field ho­mo­gene­ity: striplines have been cho­sen for the kick­er el­e­ments. An­a­lyt­i­cal cal­cu­la­tions have been car­ried out to de­ter­mine the ef­fect of ta­per­ing upon the high fre­quen­cy beam cou­pling impedance. In ad­di­tion de­tailed nu­mer­i­cal mod­el­ing of the field ho­mo­gene­ity has been per­formed and the sen­si­tiv­i­ty of the ho­mo­gene­ity to var­i­ous pa­ram­e­ters, in­clud­ing stripline cross-sec­tion, has been stud­ied. This paper pre­sents the main con­clu­sions of the beam impedance cal­cu­la­tions and field ho­mo­gene­ity pre­dic­tions.  
 
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. 		 
 
TUPC129 A Beam Position System for Hadrontherapy Facilities 1323
 
  • A. Faus-Golfe, C. Belver-Aguilar, C. Blanch Gutierrez, J.J. García-Garrigós
    IFIC, Valencia, Spain
  • E. Benveniste, M. Haguenauer, P. Poilleux
    LLR, Palaiseau, France
  
  Funding: MICINN-FPA:AIC10-D-000518
Es­sen­tial parts of the need­ed in­stru­men­ta­tion for the beam con­trol in the Hadron­ther­a­py ac­cel­er­a­tors are the Beam Po­si­tion Mon­i­tors (BPM). The mea­sure­ment of the beam po­si­tion in Hadron­ter­apy ac­cel­er­a­tors be­come more im­por­tant at the sec­ondary trans­port lines to­wards the pa­tient room where this pa­ram­e­ter must be com­plete­ly de­ter­mined. The BPM de­scribed in this paper is a new type of BPM based on four scin­til­lat­ing fibers cou­pled to four pho­to­di­odes to de­tect the light pro­duced by the fibers when in­ter­cept­ing the beam. We pre­sent here the study of the dif­fer­ent pho­to­di­odes able to read the light emit­ted by the scin­til­lat­ing fiber, the tests per­formed in order to find the most suit­able pho­to­di­ode to mea­sure the beam po­si­tion from the vari­a­tions in the beam cur­rent, the me­chan­i­cal de­sign and the cor­re­spond­ing ac­qui­si­tion elec­tron­ics. 		 
 
TUPC130 Beam Test Performance of the Beam Position Monitors for the TBL Line of the CTF3 at CERN 1326
 
  • J.J. García-Garrigós, C. Blanch Gutierrez, J.V. Civera, A. Faus-Golfe
    IFIC, Valencia, Spain
  • S. Döbert
    CERN, Geneva, Switzerland
  
  Funding: Funding Agency: FPA2010-21456-C02-01
A se­ries of In­duc­tive Pick-Ups (IPU) for Beam Po­si­tion Mon­i­tor­ing (BPM) with its as­so­ci­at­ed elec­tron­ics were de­signed, con­struct­ed and test­ed at IFIC. A full set of 16 BPMs, so called BPS units, were suc­cess­ful­ly in­stalled in the Test Beam Line (TBL) of the CLIC Test Fa­cil­i­ty (CTF3) at CERN. In this paper we pre­sent the re­sults of the beam test car­ried out on the BPS units of the TBL in order to de­ter­mine their beam per­for­mances and check the spec­i­fied op­er­a­tional re­quire­ments. We focus par­tic­u­lar­ly on the po­si­tion res­o­lu­tion pa­ram­e­ter which is the BPS fig­ure of merit ac­cord­ing to TBL de­mands and is ex­pect­ed to reach the 5um res­o­lu­tion at max­i­mum beam cur­rent (28A). The beam test re­sults of the BPS units are also com­pared with the pa­ram­e­ters from their pre­vi­ous char­ac­ter­i­za­tion test at lab. 		 
 
WEPS045 Feasibility Study of a High-gradient Linac for Hadrontherapy 2589
 
  • S. Verdú-Andrés, U. Amaldi, A. Degiovanni
    TERA, Novara, Italy
  • A. Faus-Golfe, S. Verdú-Andrés
    IFIC, Valencia, Spain
  • P.A. Posocco
    CERN, Geneva, Switzerland
  
  Funding: The research leading to this results has been funded by the Seventh Framework Program [FP7/2007-2013] under grant agreement number 215840-2.
Com­pact, re­li­able and lit­tle con­sum­ing ac­cel­er­a­tors are need­ed for tumor treat­ment with hadrons. As so­lu­tion, TERA pro­pos­es CABOTO (CAr­bon BOost­er for Ther­a­py in On­col­o­gy), a linac which boosts the en­er­gy of car­bon ions and H2 molecules com­ing from a cy­clotron. The linac, typ­i­cal­ly a Side-Cou­pled Linac (SCL), is di­vid­ed into sev­er­al mod­ules. The beam en­er­gy can be var­ied in steps of about 15 MeV/u with­out using ab­sorbers by act­ing on the power (am­pli­tude and/or phase) that feeds the dif­fer­ent mod­ules of the linac. This work pre­sents the struc­ture de­sign of a 5.7 GHz high rep­e­ti­tion rate SCL for a cy­clinac, that ac­cel­er­ates car­bon ions from 150 up to 400 MeV/u in less than 25 me­ters. The beam dy­nam­ics for this linac and its par­tic­u­lar en­er­gy se­lec­tion sys­tem is also dis­cussed for dif­fer­ent beam en­er­gy out­puts. 		 
 
THPZ032 Evaluation of the Combined Betatron and Momentum Cleaning in Point 3 in Terms of Cleaning Efficiency and Energy Deposition for the LHC Collimation Upgrade 3762
 
  • L. Lari, R.W. Assmann, V. Boccone, M. Brugger, F. Cerutti, A. Ferrari, A. Rossi, R. Versaci, V. Vlachoudis, D. Wollmann
    CERN, Geneva, Switzerland
  • A. Faus-Golfe, L. Lari
    IFIC, Valencia, Spain
  • A. Mereghetti
    UMAN, Manchester, United Kingdom
  
  Funding: This work has been carried out through of the European Coordination for Accelerator Research and Development (EuCARD), co-sponsored by EU 7th Framework Program.
The Phase I LHC Col­li­ma­tion Sys­tem Up­grade could in­clude mov­ing part of the Be­ta­tron Clean­ing from LHC Point 7 to Point 3 to im­prove both op­er­a­tion flex­i­bil­i­ty and in­ten­si­ty reach. In ad­di­tion, the par­tial re­lo­ca­tion of beam loss­es from the cur­rent Be­ta­tron clean­ing re­gion at Point 7 will mit­i­gate the risks of Sin­gle Event Up­sets to equip­ment in­stalled in ad­ja­cent and part­ly not ad­e­quate shield­ed areas. A com­bined Be­ta­tron and Mo­men­tum Clean­ing sce­nario at Point 3 im­plies the in­stal­la­tion of new col­li­ma­tors and a new col­li­ma­tor aper­ture lay­out. This paper shows the whole LHC Col­li­ma­tor Ef­fi­cien­cy vari­a­tion with the new lay­out pro­posed at dif­fer­ent beam en­er­gies. As part of the eval­u­a­tion, en­er­gy de­po­si­tion dis­tri­bu­tion in the IR3 re­gion gives in­di­ca­tions about the ef­fect of this new im­ple­men­ta­tion not only on the col­li­ma­tors them­selves but also on the other beam line el­e­ments.