Author: Kovalenko, V.S.
Paper Title Page
TUPME003 Simulations of the ILC Positron Source at Low Energies 1562
 
  • A. Ushakov, V.S. Kovalenko, G.A. Moortgat-Pick
    University of Hamburg, Hamburg, Germany
  • S. Riemann, 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 Optimization", contract number 19XL7Ic4
The International Linear Collider (ILC) baseline design includes an undulator-based positron source. The accelerated electron beam will be used for the positron generation before it goes to the collision point. For the whole ILC energy range the source has to generate 1.5 positrons per electron. However, the efficiency of positron production goes down with decreasing electron drive beam energy. This effect can be compensated to some extend by the choice of undulator parameters and an optimized capture section. The simulation study considers for the range of electron beam energies down to low values of 120 GeV the feasibility to achieve the required positron yield. In particular, the optimum parameters for undulator and capture section are presented depending on the drive electron beam energy.
 
 
TUPME004 Spin Tracking at the International Linear Collider 1565
 
  • V.S. Kovalenko, G.A. Moortgat-Pick, A. Ushakov
    University of Hamburg, Hamburg, Germany
  • S. Riemann
    DESY Zeuthen, Zeuthen, Germany
  • M. Vogt
    DESY, Hamburg, Germany
  • A. Wolski
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
 
  Funding: This work is supported by the German Federal Ministry of Education and Research, Joint Research Project R&D Accelerator "Spin Optimization", contract number 19XL7Ic4
In the baseline design for the International Linear collider an helical undulator-based positron source has been chosen that can provide positrons with a polarization of 60% as an upgrade option motivated by physics reasons. But even the baseline configuration would already provide about 30%. In order to match the high precision requirements from physics and to optimize the physics outcome one has to control systematic uncertainties to a very high level. Therefore it is needed to run both beams polarized but provide also an unpolarized set-up for control reasons. In our study we present results on precise spin tracking and propose also an minimal machine set-up to run in an unpolarized mode within the baseline design.
 
 
TUPME006 Simulation of Stress in Positron Targets for Future Linear Colliders 1571
 
  • F. Staufenbiel, S. Riemann
    DESY Zeuthen, Zeuthen, Germany
  • O.S. Adeyemi, V.S. Kovalenko, G.A. Moortgat-Pick, A. Ushakov
    University of Hamburg, Hamburg, Germany
 
  Future linear collider projects require intense positron sources with yields of about 1014 positrons per second. The positron source for the ILC is based on a helical undulator passed by the accelerated electron beam to create an intense circularly polarized photon beam. The positron beam produced by these photons is longitudinally polarized. The intense photon beam causes rapid temperature increase in the target material resulting in periodic stress. The average and peak thermal and mechanical load are simulated. Implications due to long-term target irradiation are considered.