Author: Zimmermann, F.
Paper Title Page
MOODN4 Beam Losses Due to Abrupt Crab Cavity Failures in the LHC 76
 
  • R. Calaga
    BNL, Upton, Long Island, New York, USA
  • T. Baer, J. Barranco, R. Tomás, J. Wenninger, F. Zimmermann
    CERN, Geneva, Switzerland
  • B. Yee-Rendon
    CINVESTAV, Mérida, Mexico
 
  Funding: This work partially supported by the US Department of Energy through the US LHC Accelerator Research Program (LARP).
A major concern for the implementation of crab crossing in a future high-luminosity LHC (HL-LHC) is machine protection in an event of a fast crab-cavity failure. Certain types of abrupt crab-cavity phase and amplitude changes are simulated to characterize the effect of failures on the beam and the resulting particle-loss signatures. The time-dependent beam loss distributions around the ring and particle trajectories obtained from the simulations allow for a first assessment of the resulting beam impact on LHC collimators and on sensitive components around the ring. The simulation results are used to derive tolerances on the maximum rate of change in crab-cavity phase and amplitude which can be allowed with regard to machine safety.
 
slides icon Slides MOODN4 [1.620 MB]  
 
MOP064 Asymmetric Laser Radiant Cooling in Storage Rings 229
 
  • E.V. Bulyak
    NSC/KIPT, Kharkov, Ukraine
  • J. Urakawa
    KEK, Ibaraki, Japan
  • F. Zimmermann
    CERN, Geneva, Switzerland
 
  Laser pulses with small spatial and temporal dimensions can interact with a fraction of the electron bunches circulating in Compton storage rings. We studied synchrotron dynamics of such bunches when laser photons scatter off from the electrons with energy higher than the synchronous energy. In this case of ‘asymmetric cooling', as shown theoretically, the stationary energy spread is much smaller than under conditions of regular scattering; the oscillations are damped faster. Coherent oscillations of large amplitude may be damped in one synchrotron period, which makes this method feasible for injection the bunches into a ring in the longitudinal phase space. The theoretical results are validated with simulations.  
 
TUOBN5 A Proposed Experimental Test of Proton-Driven Plasma Wakefield Acceleration Based on CERN SPS 718
 
  • G.X. Xia, A. Caldwell
    MPI-P, München, Germany
  • W. An, C. Joshi, W. Lu, W.B. Mori
    UCLA, Los Angeles, California, USA
  • R.W. Assmann, F. Zimmermann
    CERN, Geneva, Switzerland
  • R.A. Fonseca, N.C. Lopes, J. Vieira
    Instituto Superior Tecnico, Lisbon, Portugal
  • C. Huang
    LANL, Los Alamos, New Mexico, USA
  • K.V. Lotov
    BINP SB RAS, Novosibirsk, Russia
  • P. Muggli
    USC, Los Angeles, California, USA
  • A.M. Pukhov
    HHUD, Dusseldorf, Germany
  • L.O. Silva
    IPFN, Lisbon, Portugal
 
  Proton-driven plasma wakefield acceleration (PDPWA) has been proposed as an approach to accelerate electron beam to TeV energy regime in a single passage of plasma channel. An experimental test is recently proposed to demonstrate the capability of PDPWA by using proton beams from the CERN SPS. The preparation of experiment is introduced. The particle-in-cell simulation results based on realistic beam parameters are presented.  
slides icon Slides TUOBN5 [2.208 MB]