Delivered
Topic | Software update | Description | Notes |
TKR Digi | TkrDigi v2r6 | includes charge sharing and ion signal | two available routines, not enough to recover TKR hit deficit in MC |
ACD Digi | GR-v11 | better single photo-electron signal simulation by extending Poisson fluctuations to first dynodes amplification |
|
CAL Calibration Procedure | column-wise charge injection in CAL CPT online scripts | correct non-linearities in charge injection | improved CAL calibration but did not solve energy shift; will be default calibration mode for the LAT, not relevant for simulation |
CalRecon | GR-v11 | correct logs and inter-range cross-talk | require mapping of cross-talk for the LAT |
Hadronic physics list | GR-v12 |
| improved model for hadronic interactions (Bertini model up tp 10GeV, QGSP model up to 20GeV) |
TKR material audit | GR-v12 | real TKR thin converter thickness | 8% lower wrt to original design |
List of planned deliverables and expected delivery
Topic | Expected delivery | Description | Notes |
TKR material audit | end september | update mass of passive material to real values from measurements | known missing mass in current model mostly around active area |
CAL material audit | end september | check and update CAL mass and materials | preliminary surveys indicate good model |
TKR alignment in MC | quick fix available in GR-v12 | fix bug in MC alignment | checking out alternative alignment strategy |
New mass simulation | end september | with latest sim-recon package | will be used to re-evaluate TKR hits deficit and CAL energy shift in simulation |
Special TKR geometry simulation | in progress | vacuum layer between silicon layers and tray core | performed to check penetration of delta rays in a more realistic geometry; preliminary results indicate little effect on TKR hits |
Low-energy simulations | in progress | systematic test of LE EM physics list in G4 and range cutoff studies | preliminary results indicate no effect of range cutoffs and a non-perfect control of LE physics list in our simulation |
background simulations with higher TKR hits | end september | increase artificially number of TKR hits to mimick BT data | will use alignment bug and will check effect on background rejection |
background simulation with shifted CAL energies | end september | artificially scale simulated CAL energies and most important CAL variables to mimick BT data | will check effect on background rejection and reconstruction algorithms |
final best physics list | november | final MC tuning | should flow into the Service Challenge 1 year run. it will includes best physics list and modification to geometry |
Currently planned MC checks:
- restate data/MC agreement with v7 MC for CAL
- cross-check TKR PSF and HIT summary posted in the agenda on october 17
- check effect of the extra neutral vertex on the PSF - any bias introduced?
- double check beam spot from David P for all simulated runs
- check cerenkov pressure for run at 200GeV - Johan found it was wrong?
- verify alignment effect in v7
- seems negligible from Johan MC-MC comparison (links on Good Runs), while cerenkov pressure seem to have been wrong in earlier MC
- sistematically check cerenkov pressure systematics with a scan
- verify effect of cuts on hit deficit
- run 1 sim with extended beam spot and cut on differnt parts to check possible effects
- apply nicola's cuts on beam spot plot and check if special spots are selected
- add fiducial cuts in the selection?
- smearing routine to align CAL MC variables to data values
- scan extra material along beam line after above realignment