Software parallel session summary

MICE collaboration meetingINFN, 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

 

Status of TOF and Ckov Sub-packages in G4Mice

Steve Kahn27 June 2005

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

CKOV2 x-y distribution

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?

Spill structure

• Simulation– Changes needed 5 days

• EngModel– Change & check RF 5 days

• DetModel– Minimal changes 0 days?

• DetResp– Change all detectors 5x10 days

• Recon– Change/add recon for all detectors 5x50 days

~300 mousedays!