Proposal for Feasibility Study of Bent Crystal Collimation for LHC Phase II - PowerPoint PPT Presentation

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Proposal for Feasibility Study of Bent Crystal Collimation for LHC Phase II

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(presented by Vladimir Shiltsev) bnl - fnal- lbnl - slac. US LHC Accelerator Research Program ... Using the crystal, a factor of 2 achieved in reduction of CDF losses ... – PowerPoint PPT presentation

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Title: Proposal for Feasibility Study of Bent Crystal Collimation for LHC Phase II


1
Proposal for Feasibility Study of Bent
CrystalCollimation for LHC Phase II
US LHC Accelerator Research Program
bnl - fnal- lbnl - slac
  • Nikolai Mokhov
  • (presented by Vladimir Shiltsev)

2
Two-Stage Collimation Target vs Crystal
Courtesy R. Assmann
3
1TeV Channeling, Beam Loss Reduction
Using the crystal, a factor of 2 achieved in
reduction of CDF losses a half a ring (2 miles)
downstream!
4
Proposal Feasibility Study for LHC
  • Stages
  • Stage 1 feasibility study itself
  • Stage 2 design of the LHC Phase II Collimation
    system
  • Goal deliver a report (of a mini-review?) by
    next LARP collaboration meeting ( April 2007),
    be in position to decide whether to proceed to
    Stage 2
  • Plan
  • Prepare and perform bent crystal experiments at
    Tevatron in Fall 2006
  • Prepare and perform crystal characterization
    experiment at SPS H8 line in Sep06
  • Data processing and analysis
  • Theory work and code development for the LHC

5
New Crystal Status and Schedule
  • A new custom crystal was fabricated and
    characterized at Protvino and Ferrara 3-mm long,
    150 mrad bending angle, strip, chemical etching.
  • It replaces the old one during the current
    Tevatron long shutdown it is already in the
    tunnel, has been vacuum-certified, with the exact
    knowledge of crystal orientation, miscut angle
    etc.
  • Planning to install the D0 crawling wire scan in
    front of the E03 collimator to measure profile of
    the deflected beam.
  • Planning to start beam in the Tevatron
  • in mid-June with opportunities for
  • the crystal collimation in August. Visits
  • at Fermilab at that time Yu.Chesnokov
  • (IHEP), W.Scandale (CERN), V.Guidi
  • and M.Fiorini (Ferrara).

6
CRYSTAL COLLABORATION EXPERIMENTS AT CERN
  • Experimental study of crystal channeling at CERN
    SPS for use at the LHC in diffractive physics and
    halo cleaning
  • Beam-crystal experiments at CERN
  • First two weeks of Sept. 2006 Precise angular
    measurements to distinguish channeling, volume
    capture and volume reflections -gt extracted beam
    at H8, approved, supported by INFN (400 kEuro)
    and INTAS/CERN (130 kEuro), Dean Still to
    participate.
  • 2007 Crystal collimation efficiency in SPS (ala
    Tevatron) -gt based on success at Tevatron and
    extracted beamlines.
  • Responsibility split between CERN, INFN,
    Fermilab, PNPI, JINR and IHEP in 7 areas Tank
    (crystal, goniometer, integration), pipe,
    scintillators, silicon, calculations, analysis,
    and DAQ.

7
Requests/Needs
  • Manpower
  • No addl manpower needed
  • Money
  • 10k for travel (D.Still, N.Mokhov, Yu.Chesnokov)
  • 5k for CATCH code modification (to make
    MARS-compatible, V.Biryukov)
  • 0.5 FTE or 60k for Labor (Still, Mokhov,
    Drozhdin)
  • Total 75k35k in FY06 40k in FY07
  • Note co-existance of crystal targets with
    rotating collimators in Phase II system
    (co-ordination by Tom is needed)

8
backUp Slides
  • slides

9
CRYSTAL COLLIMATION For LARP Ph II
  • Based on the Tevatron experience, progress in
    simulations and understanding of channeling
    phenomena in a multi-turn mode, and needs in a
    highly efficient collimation system once the
    luminosity at the LHC approaches the nominal one
    (and beyond), we propose to include a crystal
    collimation item into the LARP program.
  • This is already a multi-Lab business that
    includes a new crystal collimation experiment at
    Tevatron (August 2006), crystal characterization
    at the SPS H-8 beam line (September 2006), theory
    and code developments (CATCH-MARS coupling among
    them), crystal collimation modeling for LHC at
    CERN, Fermilab and IHEP, with dedicated s in.
  • CERN is interested in a potential benefit of
    crystals to increase both collimation efficiency
    at LHC and the physics capability of the TOTEM
    and CMS experiments.

10
Tev Crystal Collimator
Laser angular measurement
PIN Diode BLM
E0 Scintillater Paddles
E03 Secondary Collimator
E0 Crystal Collimator Assembly
11
1 TeV Channeling, Oct 5, 2005
12
1TeV Beam Channeling Model
N.Mokhov Co D.Still
New explanation volume reflections
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