Author: Riemann, S.
Paper Title Page
TUPPR042 On the Polarization Upgrade of ILC Undulator-based Positron Source 1912
 
  • W. Liu, W. Gai
    ANL, Argonne, USA
  • S. Riemann
    DESY, Hamburg, Germany
  • A. Ushakov
    University of Hamburg, Hamburg, Germany
 
  The current nominal polarization for ILC undulator based positron source is 30% without photon collimators. In order to improve the effective luminosity, an upgrade of positron source with higher polarization is required. Some studies on the upgrade options have been done at both DESY and ANL, and the results are presented in this paper.  
 
TUPPR001 Spin Tracking Simulation of a Future International Linear Collider 1807
 
  • V.S. Kovalenko, O.S. Adeyemi, L.I. Malysheva, G.A. Moortgat-Pick, A. Ushakov
    University of Hamburg, Hamburg, Germany
  • A.F. Hartin
    DESY, 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 Management", contract number 05H10GUE
The full physics potential of the International Linear Collider (ILC) is expected to be optimized by using polarized electron and positron beams. To ensure that no significant polarization can be lost during the transport of the electron and positron beams from the source to the interaction region, spin tracking has to be included in all transport elements which can contribute to a potential loss of polarization. The possible sources of depolarization such as the spin rotators and the damping ring have been investigated for the current ILC baseline. The detailed spin tracking simulations and study depolarization was performed by using BMAD and SLICKTRACK computer codes. The new results of our simulations for the ILC are presented.
 
 
TUPPR002 Simulations of Positron Polarization in the Undulator-Based Source 1810
 
  • 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, 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
The generation of an intense and highly polarized positron beam is a challenge. The design for the International Linear Collider proposes a positron source based on a helical undulator located at the end of the electron linac. This design allows us to utilize a high energy linear accelerator with both electron and positron beams polarized. The polarization of the positron beam can be enhanced using a photon collimator. The optimization of positron yield and polarization for a wide energy range has been studied for different undulator parameters and collimator designs, taking into account realistic parameters for the capture section. In particular, the effects of misalignment and tolerances are considered.
 
 
TUPPR003 The Design of Spin-Rotator with a Possibility of Helicity Switching for Polarized Positron at the ILC 1813
 
  • L.I. Malysheva, O.S. Adeyemi, V.S. Kovalenko, G.A. Moortgat-Pick, A. Ushakov
    University of Hamburg, Hamburg, Germany
  • A.F. Hartin, B. List, N.J. Walker
    DESY, Hamburg, Germany
  • S. Riemann, F. Staufenbiel
    DESY Zeuthen, Zeuthen, Germany
 
  Funding: Work supported by German Federal Ministry of education and research. Joint Research project R&D Accelerator Spin Management, contract N 05H10CUE
At the ILC, positrons are produced with longitudinal polarization at the source. In order to preserve the polarization, the spin must be rotated into the vertical direction prior to injection into the damping rings. A new design of the spin rotator is presented that allows to randomly switch between the two vertical orientations between successive bunch trains. After rotating the spin back to longitudinal polarization, this corresponds to a choice between the two possible helicity states at the interaction point. The fast flipping is achieved by inserting two parallel spin rotation sections with opposite polarities, with a fast magnet that allows to choose between the sections.
 
 
WEPPD032 Heat Load Studies in Target and Collimator Materials for the ILC Positron Source 2576
 
  • F. Staufenbiel, S. Riemann
    DESY Zeuthen, Zeuthen, Germany
  • O.S. Adeyemi, V.S. Kovalenko, L.I. Malysheva, G.A. Moortgat-Pick, A. Ushakov
    University of Hamburg, Hamburg, Germany
 
  An intense polarized positron beam for future linear colliders can be produced using a high power beam of circularly polarized photons which penetrates a thin titanium-alloy target. The degree of polarization can be increased by cutting the outer part of the photon beam generated in a helical undulator using a collimator in front of the target. However, the photon beam induces substantial heat load and stress inside the target and collimator materials. In order to avoid failure of these components the stress evolution has been simulated. The results as well as the corresponding material arrangements for the photon collimator design are presented.  
 
MOPPP033 Diagnostics at PITZ 2.0 Beamline: Status and New Developments 634
 
  • M. Otevřel, A. Donat, H.-J. Grabosch, M. Groß, L. Hakobyan, H.M. Henschel, L. Jachmann, M. Khojoyan, G. Klemz, W. Köhler, G. Koss, G. Kourkafas, M. Krasilnikov, K. Kusoljariyakul, H. Leich, J. Li, M. Mahgoub, D. Malyutin, B. Marchetti, J. Meissner, A. Oppelt, M. Penno, B. Petrosyan, M. Pohl, S. Riemann, M. Sachwitz, B. Schöneich, J. Schultze, A. Shapovalov, F. Stephan, F. Tonisch, G. Vashchenko, L.V. Vu, T. Walter, S. Weisse, R.W. Wenndorff, M. Winde
    DESY Zeuthen, Zeuthen, Germany
  • G. Asova
    INRNE, Sofia, Bulgaria
  • N.I. Brusova, L.V. Kravchuk, V.V. Paramonov
    RAS/INR, Moscow, Russia
  • A. Gonnin, M. Joré, B. Mercier, C. Prevost, A. Variola
    LAL, Orsay, France
  • I.I. Isaev
    MEPhI, Moscow, Russia
  • Ye. Ivanisenko
    IERT, Kharkov, Ukraine
  • D. Richter
    HZB, Berlin, Germany
  • S. Rimjaem
    Chiang Mai University, Chiang Mai, Thailand
  • A.A. Zavadtsev, D.A. Zavadtsev
    Nano, Moscow, Russia
 
  The main aim of the Photo Injector Test Facility at DESY, Zeuthen (PITZ) site is to develop and test an FEL photo injector system capable of producing high charge short electron bunches of lowest possible transverse emittance to allow optimum FEL performance. The last major beamline upgrade realized in the second half of the year 2011 completed the evolution of the PITZ setup ongoing since 2005. The most recent upgrades include the installation of a new RF deflecting cavity - a prerequisite for longitudinal emittance and high resolution slice emittance measurements and installation of a new dispersive section for longitudinal phase space diagnostics of the high energy electron bunches. The paper will give an overview on electron beam diagnostics at PITZ, including the above mentioned upgrades.