1. Particle ID in the MICE Beamline MICE Collaboration Meeting 30 March 2004. Paul Soler, Kenny Walaron University of Glasgow and Rutherford Appleton Laboratory

2. 2 MICE Collaboration Meeting 30 March 2004 Aims 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.

3. 3 MICE Collaboration Meeting 30 March 2004 MICE Beamline Layout:

4. 4 MICE Collaboration Meeting 30 March 2004 MICE Beamline Layout:

5. 5 MICE Collaboration Meeting 30 March 2004 MICE Beamline Working assumption: solenoid magnet inside the beamline Transport of particles in MICE beamline (LAHET simulation from proposal) o Insert scintillator recording planes for PID

6. 6 MICE Collaboration Meeting 30 March 2004 MICE Beamline New beamline layout (Tilley/Roberts) Q1 Q2 Q3 B1 Q4 Q5Q6Q7Q8B2 Proton Absorber TOF1 Diffuser2 Decay Solenoid PID scintillators?

7. 7 MICE Collaboration Meeting 30 March 2004 GEANT4 Beamline Simulation o MICE beam simulation prepared in GEANT4 (see Tom Roberts presentation 24/9/03 and 14/1/04) showed differences between G4 and other simulations: LocationLAHETgeant4 After Q421141345 After Q51467933 After Q61264804 After Q7444282 After Q8348222 After Q9336214 After Tracker1321204 Good μ + (40°) 157100 Good μ + (90°) 170108 Good μ + (no LH2, no RF) 178113 57% difference! Need to validate simulations by measuring rates, profiles and particle ID along beamline.

8. 8 MICE Collaboration Meeting 30 March 2004 g4beamline o Have commenced to work with g4beamline simulation (thanks to Tom Roberts for providing beta versions) o Need to insert scintillator elements into simulation and run under different configurations o Still learning how to run simulation and (especially!) compile new configurations. o 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?

9. 9 MICE Collaboration Meeting 30 March 2004 Particle ID in beamline o Particle identification in beamline: dE/dx for proton separation o Scintillator: protons less than 400 MeV/c deposit >8.5 MeV/cm, while pions/muons deposit 1.6-4.0 MeV/cm

10. 10 MICE Collaboration Meeting 30 March 2004 Scintillator layout o Would aim to have as little segmentation as possible o If rate proves to be a problem, perform segmentation, with smaller segmentation in centre. For example: Scintillator PMTs Waveguides PMTs o Double sided readout allows to measure energy, independent of position of particle along scintillator.

11. 11 MICE Collaboration Meeting 30 March 2004 Conclusions o MICE beam simulation prepared in GEANT4 by Tom Roberts to be used for beam and PID studies o Have started working with it, but still need to learn more about programme and try to run different configurations. o In the process of including particle ID elements to enable design of scintillators (ie. segmentation, thickness) to cope with particle rates.