Alessandro Scordo LNF – INFN, Frascati SIDDHARTA Collaboration
Software parallel session summary MICE collaboration meeting INFN, Frascati 27/6-05.
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Transcript of Software parallel session summary MICE collaboration meeting INFN, Frascati 27/6-05.
MICE Meeting in FrascatiSoftware & Simulation Working Group draft agenda
Monday 27, June - 14:30 - 17:30 - LNF, Room B34
14:30 - G4 MICE Steps/Stage/Phases
Y. Torun
Optics Progress Report C. Rogers
TOF and Ckov Update S. Kahn
EMCal Status R. Sandstrom
Physics List and GEANT 4 R. Sandstrom
(somebody for) Status of G4 MICE fro KEK Beam Test
M. Ellis
Detectors for KEK Beam Test
A. Klier
Package Managers: Review of Package Status
- 17:30 Action Items and Schedule All
TOF Digitization Response Algorithm
attendep
attendep
xL
CEAmpl
xL
CEAmpl
/2
exp
/2
exp
2
1Signal amplitude at PMTs:
These responses are converted to digits (adc counts)
jitterPMTrefr
decaytrack
jitterPMTrefr
decaytrack
tc
nx
Lttt
tc
nx
Lttt
_2
_1
2
2
Signal time at PMTs:
ttrack is the time of the track through the scintillator
tdecay is an exponentially distributed scintillator decay time
tPMT jitter is a gaussian distributed PMT resolution time.
These responses are converted to digits (tdc counts)
transit time
No attempt yet to track scintillator photons
Cherenkov Systems GeometryShould be up-to-date
• Upstream Ckov– C6F14 radiator with n=1.25– 4 PMTs
• 2 on top, 2 on bottom.
– Threshold cherenkov:• 0.7 MeV for electrons• 140 MeV for muons• 190 MeV for pions
• Downstream Ckov– Aerogel with n=1.03 (Should use 1.04)– 12 PMTs on 12-sided polygon.– Typically on electrons visible since pion
threshold is > 500 MeV.– Requires TOF coincidence.
Photon Generation in the Cherenkov Detectors
• For each track that crosses the radiator with a velocity above threshold a number of photons are generated proportional to the deposited energy.
• We currently do not use the Cherenkov photon facility in Geant4.
– There is some question as to how well it works with reflective surfaces.
• Imaginary photons are generated in a cone (at the č angle) around the particle direction.
• Since all mirrors are at 45º w.r.t. the beam direction, we can position the PMTs on an imaginary plane.
– The č photons that intercept the PMT circles are “seen”.
– Note that Ckov1 has an angle of 53°. The circles should be ellipses. This has not yet been taken into account
• Note that Ckov2 has 12 PMTs whereas Ckov 1 has only 4 PMTS.
G4MICE downstream distributionsG4MICE plans
Rikard SandströmUniversite de Geneve
MICE collaboration meeting27/6-05
Planning ahead, spill structure
• Add option to run MICESpill, not only MICEEvent.
• Need decision on trigger!• How to set RF phases?• Converge with Malcolm et al.
– Need a dedicated meeting.
• Detector code will need to change.– Only TPG OK already to my knowledge.
Planning ahead, run all BG
• When we can do spill, run with:A
– EMCal, how well can it handle multiple events, pile up etc.
B– Beam starting at TOF1.– Diffuser, iron shield etc.– Pion contamination (decay on)– Muon decay on– RF bg from background bank– Taking p_t, p_z and TOF from real reconstruction.– Result: realistic emittance resolution!
One year from now?