Particle ID Diagnostics in the MICE Beamline

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Particle ID Diagnostics in the MICE Beamline
Paul Soler, Kenny Walaron University of Glasgow
and Rutherford Appleton Laboratory
MICE Collaboration Meeting June 2005.
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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
  gt8.5 MeV/cm, while pions/muons deposit 2 MeV/cm

Expected energy loss in scintillator
dE/dx (MeV/cm)
P (GeV/c)
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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.

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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
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Simulations for beam test
20m from target
10m from target
p
p
m
p
p
m

• 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

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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 1.5-1.7 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

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Equipment for beam test
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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 sx10 cm, due to different path
  lengths of photons (0.5 ns)

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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?