Title: Proposal for Feasibility Study of Bent Crystal Collimation for LHC Phase II
1Proposal 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)
2Two-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!
4Proposal 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
5New 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).
6CRYSTAL 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.
7Requests/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)
8backUp Slides
9CRYSTAL 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.
10Tev Crystal Collimator
Laser angular measurement
PIN Diode BLM
E0 Scintillater Paddles
E03 Secondary Collimator
E0 Crystal Collimator Assembly
111 TeV Channeling, Oct 5, 2005
121TeV Beam Channeling Model
N.Mokhov Co D.Still
New explanation volume reflections