1. Particle ID Diagnostics in the MICE Beamline
Paul Soler, Kenny Walaron
University of Glasgow and
Rutherford Appleton Laboratory
MICE Collaboration Meeting
June 2005.

2. Particle ID in beamline
Particle identification in beamline for validation of beamline simulations: dE/dx for proton separation
Insert slabs of scintillator upstream and downstream of solenoid for PID
Scintillator: protons less than 400 MeV/c deposit >8.5 MeV/cm, while pions/muons deposit ~2 MeV/cm
p, m
protons
Expected energy loss in scintillator
dE/dx (MeV/cm)
P (GeV/c)
MICE Collaboration Meeting
June 2005

3. Particle ID in beamline
Segmented readout slabs, read out by double ended PMTs
PMTs XP2020 or EMI 9954
Segmented BC-404
Perform test of equipment and initial validation of beamline simulation during ISIS shutdown end 2005-beginning 2006.
Idea is to install equipment inside ISIS ring for test and first measurement of beamline rates and particle ID.
MICE Collaboration Meeting
June 2005

4. MICE Collaboration Meeting
ISIS beam test (beg 2006)
Proposed location of beam test: same angle as MICE beamline but inside synchrotron ring, at 10m or 20m from target
MICE Collaboration Meeting
June 2005

5. Simulations for beam test
10m from target
20m from target p p m p m p
Air affects average momentum and dE/dx for protons.
Rates are very high (~30 MHz at 10 m)
Idea to add absorber to reduce proton rate: perform runs with 1- 5 cm of polyethylene and measure ratio of rates.
Need to perform simulations of rates with different absorber thickness
MICE Collaboration Meeting
June 2005

6. Equipment for beam test
Scintillator: Bicron BC-404 (need to purchase it in 1-2 cm slabs)
Light output 68% anthracene
Rise Time 0.7ns
Pulse width = 2.2ns
Attenuation Length (l) = 140cm
PMT: XP2020 or EMI9954 (have them, need to be tested)
Gain: ~3x107 at 2000V
Rise time: ns
Have already acquired electronics equipment for test:
CAEN V792N 12 bit Charge integrating ADC for VME: 3 Modules (48 channels)
CAEN V1290N TDC for VME: 2 modules (32 channels), 25 ps LSB
VME crate
UNIDAQ system to read out VME
Already tested system at KEK testbeam: improves TOF resolution
Need to define slab width and procure scintillator and wave-guides
MICE Collaboration Meeting
June 2005

7. Equipment for beam test
FAN IN/OUT
Q-ADC
TDC
GATE
HIGH
VOLTAGE
PMT1
PMT2 X x
VME CRATE L
MICE Collaboration Meeting
June 2005

8. MICE Collaboration Meeting
Extraction of signal
Extract a, b constants and l from calibration data.
Energy and position can be extracted from:
TDC signals can give extra information but limited to sx~10 cm, due to different path lengths of photons (0.5 ns):
MICE Collaboration Meeting
June 2005

9. MICE Collaboration Meeting
Conclusions
PID scintillators to be used for beamline diagnostics to validate beamline simulation
Perform PID system test at end 2005 inside ISIS ring at 10 m, 20 m.
Particle rates high (~30 MHz at 10 m). Can use absorber materials in front of scintillator to reduce rates: 1-5 cm of polyethylene absorber.
Compare rates from each of the runs for validation of beamline simulation
TDC and ADC electronics purchased and already integrated into UNIDAQ for KEK testbeam
Set-up system in Glasgow for testing of PMTs and scintillators to be ready at end of 2005 for beam test.
Maybe good opportunity to test TOF prototype also?
MICE Collaboration Meeting
June 2005