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Particle ID in the MICE BeamlineParticle ID in the MICE BeamlineParticle ID in the MICE BeamlineParticle ID in the MICE Beamline
MICE Collaboration MeetingMICE Collaboration Meeting30 March 2004.30 March 2004.
Paul Soler, Kenny WalaronUniversity of Glasgow and
Rutherford Appleton Laboratory
MICE Collaboration Meeting 30 March 2004
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AimsAims
• Carry out particle identification in the MICE beamline using scintillation detectors.• Use dE/dx signature to differentiate between protons and pions/muons at different positions along beamline: e.g. before Q1 and at input and output of solenoid.• Use PID information to qualify and monitor beamline simulation.Caveat: This talk is more a statement of intentions than results.
MICE Collaboration Meeting 30 March 2004
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MICE BeamlineMICE BeamlineLayout:
MICE Collaboration Meeting 30 March 2004
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MICE BeamlineMICE BeamlineLayout:
MICE Collaboration Meeting 30 March 2004
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MICE BeamlineMICE BeamlineWorking assumption: solenoid magnet inside the beamline
Transport of particles in
MICE beamline (LAHET
simulation from
proposal)
Insert scintillator recording planes for PID
MICE Collaboration Meeting 30 March 2004
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MICE BeamlineMICE BeamlineNew beamline layout (Tilley/Roberts)
Q1
Q2
Q3
B1
Q4Q4 Q5 Q6 Q7 Q8B2
Proton
Absorber
TOF1TOF1 Diffuser2
Decay
Solenoid
PID scintillators?
MICE Collaboration Meeting 30 March 2004
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GEANT4 Beamline SimulationGEANT4 Beamline Simulation MICE beam simulation prepared in GEANT4 (see Tom
Roberts presentation 24/9/03 and 14/1/04) showed differences between G4 and other simulations:
Location LAHET geant4
After Q4 2114 1345
After Q5 1467 933
After Q6 1264 804
After Q7 444 282
After Q8 348 222
After Q9 336 214
After Tracker1 321 204
Good μ+ (40°) 157 100
Good μ+ (90°) 170 108
Good μ+ (no LH2, no RF) 178 113
57% difference!
Need to validate simulations by
measuring rates, profiles and
particle ID along beamline.
MICE Collaboration Meeting 30 March 2004
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g4beamlineg4beamline
Have commenced to work with g4beamline simulation (thanks to Tom Roberts for providing beta versions)
Need to insert scintillator elements into simulation and run under different configurations
Still learning how to run simulation and (especially!) compile new configurations.
Questions to be answered:– What is optimal position for PID scintillators?– What is particle rate at each of potential scintillator positions?– What type of segmentation needed to withstand rate?
MICE Collaboration Meeting 30 March 2004
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Particle ID in beamlineParticle ID in beamline Particle identification in beamline: dE/dx for proton separation Scintillator: protons less than 400 MeV/c deposit >8.5 MeV/cm, while
pions/muons deposit 1.6-4.0 MeV/cm
Energy loss
1
10
100
100 200 300 400 500 600 700 800
Momentum (MeV/c)
-dE
/dx
(MeV
/g/c
m2)
Pion
Proton
Muon
MICE Collaboration Meeting 30 March 2004
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Scintillator layoutScintillator layout Would aim to have as little segmentation as possible If rate proves to be a problem, perform segmentation, with smaller
segmentation in centre. For example:
Scintillator
PMTsWaveguides Waveguides
PMTs
Double sided readout allows to measure energy, independent of position of particle along scintillator.
MICE Collaboration Meeting 30 March 2004
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ConclusionsConclusions MICE beam simulation prepared in GEANT4 by Tom
Roberts to be used for beam and PID studies Have started working with it, but still need to learn
more about programme and try to run different configurations.
In the process of including particle ID elements to enable design of scintillators (ie. segmentation, thickness) to cope with particle rates.