Author: Forck, P.
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TUPF04 Numerical Calculations for the FAIR Proton Linac BPMs 303
 
  • C.S. Simon
    CEA/DSM/IRFU, France
  • M.H. Almalki, P. Forck, W. Kaufmann, T. Sieber
    GSI, Darmstadt, Germany
  • V. Bellego
    CEA/IRFU, Gif-sur-Yvette, France
 
  Fourteen Beam Position Monitors (BPMs) will be installed along the FAIR Proton LINAC. These monitors will be used to determine the beam position, the relative beam current and the mean beam energy by time of flight (TOF). A capacitive button type pickup was chosen for its easy mechanical realization and for the short insertion length which is important for the four BPMs locations of the inter-tank sections between the CH-cavities. Depending on the location, the BPM design has to be optimized, taking into account an energy range from 3 MeV to 70 MeV, limited space for installation and a 30 mm or 50 mm beam pipe aperture. This paper reports wake field numerical simulations performed by the code CST PARTICLE STUDIO to design and characterize the BPMs. Time of response of monitors are presented and results of calculations for various pickup-geometries are discussed taking into account different beam velocities.  
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TUPD05 Optimization of Beam Induced Fluorescence Monitors for Profile Measurements of High Current Heavy Ion Beams at GSI 412
 
  • C. Andre, P. Forck, R. Haseitl, A. Reiter, R. Singh, B. Walasek-Höhne
    GSI, Darmstadt, Germany
 
  To cope with the demands of the Facility for Antiproton and Ion Research (FAIR) for high current operation at the GSI Heavy Ion Linear Accelerator UNILAC non intercepting methods for transverse beam profile measurement are required. In addition to intercepting diagnostics like Secondary Electron Emission Grid (SEM-Grid) or scintillating screens, the Beam Induced Fluorescence (BIF) Monitor, an optical measurement device based on the observation of fluorescent light emitted by excited nitrogen molecules, was brought to routine operation. Starting with the first installations in 2008 and consequent improvements, successively six monitors were set up in the UNILAC and in the transfer line (TK) towards the synchrotron SIS18. BIF is used as a standard diagnostic tool to observe the ion beam at kinetic energies between 1.4 and 11.4 MeV/u. Beside the standard operation mode where the gas pressure is varied, further detailed investigations were conducted. The BIF setups were tested with various beam parameters. Different settings of camera, optics and image intensification were applied to improve the image quality for data analysis. In parallel, the light yield from different setups was compared for various ions, charge states, beam energies and particle numbers.  
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TUPD07 Performance Demonstration of the Non-Invasive Bunch Shape Monitor at GSI High Current LINAC 421
 
  • B. Zwicker, O.K. Kester
    IAP, Frankfurt am Main, Germany
  • C. Dorn, P. Forck, O.K. Kester, P. Kowina, B. Zwicker
    GSI, Darmstadt, Germany
 
  Funding: Supported by EU-Project CRISP, WP3 T1 ‘Non-intercepting Bunch Shape Monitors‘
At the heavy ion LINAC at GSI, a novel scheme of non-invasive Bunch Shape Monitor has been tested with several ions beam at 11.4 MeV/u and beam current in the range from 80 μA to 1000 μA. Caused by the beam impact on the residual gas, secondary electrons are liberated. These electrons are accelerated by an electrostatic field, transported through a sophisticated electrostatic energy analyzer and an rf-deflector, acting as a time-to-space converter. Finally a MCP amplifies the electrons and the electron distribution is detected by a CCD camera. For the applied beam settings this Bunch Shape Monitor is able to obtain longitudinal profiles down to of 250 ps RMS width with an RMS resolution of 34 ps, corresponding to 0.5° of the 36 MHz acceleration frequency. Systematic parameter studies, for the device were performed to demonstrate the applicability and to determine the achievable resolution. The background contribution, as orginated by x-rays, are investigated.
 
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WEPD01 Observations of the Quadrupolar Oscillations at GSI SIS-18 629
 
  • R. Singh, P. Forck, P. Kowina
    GSI, Darmstadt, Germany
  • M. Gąsior
    CERN, Geneva, Switzerland
  • W.F.O. Müller, J.A. Tsemo Kamga, T. Weiland
    TEMF, TU Darmstadt, Darmstadt, Germany
 
  An asymmetric capacitive pick-up was installed at GSI SIS-18 for determination of the turn-by-turn beam quadrupole moment. The pick-up geometry is simulated to estimate its sensitivity towards the beam dipole and quadrupole moments. Turn-by-turn quadrupole moment measurement allows to calculate the frequency of beam-size oscillations. Recent beam measurements using this pick-up show clear indications of the beam-size oscillations induced by the injection mismatch. In this contribution, we present these measurements and discuss their relevance for the direct determination of the incoherent space charge tune shift.  
poster icon Poster WEPD01 [3.589 MB]  
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