Status of the RPC simulation package Everard CORDIER (Heidelberg)

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Status of the RPC simulation packageEverard
CORDIER (Heidelberg)
CBM collaboration meeting, March 11, 2005
TOF-RPC working group
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Outline

• Status of the geometry in CBM VMC
• Class status TofPoint and TofHit
• Next steps, discussion

CBM collaboration meeting, March 11, 2005
TOF-RPC working group
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Actual geometry in CVS

• TOF at 10 meters from target
• Total wall area 106 m²
• 16 Plates with 4 gaps

CBM collaboration meeting, March 11, 2005
TOF-RPC working group
4
What to do for the geometry?

• Choose types of RPCs (single cell or strips) and
  the area covered
• Smallest cells 4cm2 ? 2500 cells/1m2 (lt1 area)
• Strips RPC for rate 1kHz/cm2 ? 25 - 33
• 3rd type bigger cells to cover at least 50 of
  the wall
• Different number of gaps 4 gaps for cells, 8
  for strips?
• Software wise find a simple way to duplicate
  and place the counters (in mother volume,
  different materials) in order to allow the users
  to modify easily the geometry (cell size and
  position, avoid the overlaps)

CBM collaboration meeting, March 11, 2005
TOF-RPC working group
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Existing classes for TOF

• CbmTofPoint, members
• Tof time since event start (ns)
• Length track length since creation (cm)
• Pos coordinates at entrance to active volume
  (cm)
• Eloss energy deposit (GeV)
• Mom momentum of track at entrance (GeV)
• TrackID Index of MCTrack
• DetID detector ID
• CbmTof construct geometry and register MCpoints

CBM collaboration meeting, March 11, 2005
TOF-RPC working group
6
Next step hit digitization

• Implementation of the CbmTofHitProducer
• Class CbmTofHit, determine members needed by
  analysis
• Tof time since event start (ns)
• Length track length since creation (cm)
• Pos coordinates at entrance to active volume
  (cm)
• ...?

CBM collaboration meeting, March 11, 2005
TOF-RPC working group
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Strategy and constraints

• CbmTofHitProducer loops over points and fill the
  list of hits (1 track ? 4 points (each gap) ?
  1hit)
• ? Has to work for different geometries
• ? Should permit changes like tof resolution or
  efficiency (...) for the analysis
• CbmTofCellHitProducer CbmTofStripProducer,
• (CbmTofCell2HitProducer...)
• Classes should be integrated in CVS standard
  names and methods have to be used

CBM collaboration meeting, March 11, 2005
TOF-RPC working group
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Other ideas, conclusion

• Add efficiency (as a parameter in the hit
  producer ?)
• Add randomly fake hits (which level ?)
• ...?

? Need more people involved in TOF simulation
cordier_at_physi.uni-heidelberg.de
TOF-RPC working group
CBM collaboration meeting, March 11, 2005