Author: Schaelicke, A.     [Schälicke, A.]
Paper Title Page
TUPC005 Evolution of Pressure in Positron Source for Future Linear e+e Collider 994
 
  • O.S. Adeyemi, V.S. Kovalenko, L.I. Malysheva
    University of Hamburg, Hamburg, Germany
  • A.F. Hartin, G.A. Moortgat-Pick, S. Riemann, A. Ushakov
    DESY, Hamburg, Germany
  • A. Schälicke, F. Staufenbiel
    DESY Zeuthen, Zeuthen, Germany
 
  Funding: This work is supported by the German Federal Ministry of Education and Research, Joint Research Project R&D Accelerator "Spin Management", contract number 05H10GUE
En­er­gy de­po­si­tion in the con­ver­sion tar­gets of positron sources for fu­ture lin­ear col­lid­ers in­duces an im­mense ther­mal load and cre­ate pres­sure waves in the ma­te­ri­al. This stress could sub­stan­tial­ly re­duce the life­time of the tar­get or other tar­get ma­te­ri­als im­pinged by the in­ci­dent in­tense pho­ton or elec­tron beam. We have stud­ied the evo­lu­tion of acous­tic pres­sure waves in tar­get ma­te­ri­als based on the pa­ram­e­ter as­sump­tions for the In­ter­na­tion­al Lin­ear Col­lid­er (ILC) base­line source. The fluid model is em­ployed by tak­ing into ac­count the tar­get and the in­ci­dent pho­ton beam pa­ram­e­ters. Ini­tial re­sults of these new sim­u­la­tions are pre­sent­ed and com­pared with ear­li­er stud­ies. Prospects for fur­ther stud­ies are out­lined.
 
 
TUPC006 Production of Highly Polarized Positron Beams* 997
 
  • A. Ushakov, O.S. Adeyemi, V.S. Kovalenko, L.I. Malysheva, G.A. Moortgat-Pick
    University of Hamburg, Hamburg, Germany
  • A.F. Hartin
    DESY, Hamburg, Germany
  • S. Riemann, A. Schälicke, F. Staufenbiel
    DESY Zeuthen, Zeuthen, Germany
 
  Funding: This work is supported by the German Federal Ministry of Education and Research, Joint Research Project R&D Accelerator "Spin Management", contract number 05H10GUE
Using of po­lar­ized elec­tron and positron beams sig­nif­i­cant­ly in­creas­es the physics po­ten­tial of fu­ture lin­ear col­lid­ers. The gen­er­a­tion of an in­tense and high­ly po­lar­ized positron beam is a chal­lenge. The un­du­la­tor-based positron source lo­cat­ed at the end of elec­tron linac is the base­line source for the In­ter­na­tion­al Lin­ear Col­lid­er. In case of a 250 GeV drive beam en­er­gy, an he­li­cal un­du­la­tor with K = 0.92, an un­du­la­tor pe­ri­od of 11.5 mm and a ti­ta­ni­um alloy tar­get of 0.4 ra­di­a­tion length thick­ness, the av­er­age po­lar­iza­tion of the gen­er­at­ed positrons is rel­a­tive­ly low (about 22 per­cent). In this con­tri­bu­tion, the pos­si­bil­i­ties of in­creas­ing the positron po­lar­iza­tion have been con­sid­ered by ad­just­ing the un­du­la­tor field and se­lect­ing those pho­tons and positrons that yield a high­ly po­lar­ized beam. The de­tailed sim­u­la­tions have been per­formed with our de­vel­oped Gean­t4-based ap­pli­ca­tion PPS-Sim*.
* http://pps-sim.desy.de