03 Linear Colliders, Lepton Accelerators and New Acceleration Techniques

T19 Collimation and Targetry

Paper Title Page
WEPEB046 Optimization of the CLIC Baseline Collimation System 2794
 
  • J. Resta-López
    JAI, Oxford
  • D. Angal-Kalinin, J.-L. Fernandez-Hernando, F. Jackson
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • B. Dalena, D. Schulte, R. Tomás
    CERN, Geneva
  • A. Seryi
    SLAC, Menlo Park, California
 
 

Important efforts have recently been dedicated to the improvement of the design of the baseline collimation system of the Compact Linear Collider (CLIC). Different aspects of the design have been optimized: the transverse collimation depths have been recalculated in order to reduce the collimator wakefield effects while maintaining a good efficiency in cleaning the undesired beam halo; the geometric design of the spoilers have also been reviewed to minimize wakefields; in addition, the optics design have been polished to improve the collimation efficiency. This paper describes the current status of the CLIC collimation system after this optimization.

 
WEPE098 Optimising Pion Production Target Shapes for the Neutrino Factory 3581
 
  • S.J. Brooks
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon
 
 

The neutrino factory requires a source of pions within a momentum window determined by the ‘muon front end' accelerator structure downstream. The technique of finding which parts of a large target block are net absorbers or emitters of particles may be adapted with this momentum window in mind. Therefore, analysis of a hadronic production simulation run using MARS15 can provide a candidate target shape in a single pass. However, changing the shape of the material also affects the absorption/emission balance, so this paper investigates iterative schemes to find a self-consistent optimal, or near-optimal, target geometry.

 
WEPE099 Thermal and Mechanical Effects of a CLIC Bunch Train Hitting a Beryllium Collimator 3584
 
  • J.-L. Fernandez-Hernando
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • J. Resta-López
    JAI, Oxford
 
 

Beryllium is being considered as an option material for the CLIC energy collimators in the Beam Delivery System. Its high electrical and thermal conductivity together with a large radiation length compared to other metals makes Beryllium an optimal candidate for a long tapered design collimator that will not generate high wakefields, which might degrade the orbit stability and dilute the beam emittance, and in case of the beam impacting the collimator temperature rises will not be sufficient enough to melt the metal. This paper shows results and conclusions from simulations of the impact of a CLIC bunch train hitting the collimator.

 
WEPE100 Dielectric Collimators for Linear Collider Beam Delivery System 3587
 
  • A. Kanareykin, P. Schoessow
    Euclid TechLabs, LLC, Solon, Ohio
  • S. Baturin
    LETI, Saint-Petersburg
  • R. Tomás
    CERN, Geneva
 
 

In this presentation, dielectric collimator concepts for the linear collider will be described. Cylindrical and planar dielectric collimator designs for CLIC and ILC parameters will be presented, and results of simulations to minimize the beam impedance will be discussed. The prototype collimator system is planned to be fabricated and experimentally tested at Facilities for Accelerator Science and Experimental Test Beams (FACET) at SLAC.

 
WEPE101 A 4-MW Target Station for a Muon Collider or Neutrino Factory 3590
 
  • H.G. Kirk
    BNL, Upton, Long Island, New York
  • J.J. Back
    University of Warwick, Coventry
  • C.J. Densham, P. Loveridge
    STFC/RAL, Chilton, Didcot, Oxon
  • X.P. Ding
    UCLA, Los Angeles, California
  • V.B. Graves
    ORNL, Oak Ridge, Tennessee
  • F. Ladeinde, Y. Zhan
    SUNY SB, Stony Brok, New York
  • K.T. McDonald
    PU, Princeton, New Jersey
 
 

We outline a program of engineering design and simulation for a target station and pion production/capture system for a 4-MW proton beam at the front end of a Muon Collider or a Neutrino Factory. The target system consists of a free liquid-metal (nominally mercury) jet immersed in a high-field solenoid magnet capture system that also incorporates the proton beam dump. Topics to be studied include optimization of proton beam and jet target parameters, of the magnetic configuration for capture and subsequent transport of pions and muons, of the beam dump, of the radiation/thermal shielding of the capture magnets, and of the beam windows.