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?

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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

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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.

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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.