L2STT Trigger Simulator Clusters

1
L2STT Trigger Simulator - Clusters

• Silvia Tentindo Repond

Silvia Tentindo Repond FSU Boston Workshop 11
June 1999
2
L2STT Trigger Simulation Overview
STR. Boston STT

• L2STT trig sim component classes in package
  tsim_l2stt
• tsim_L2STT STEERING CLASS
• L2STTCluster Class simulates the Clustering
  FPGA of the STC
• L2STTHitsInRoads simulates the FRC and the hit
  filtering FPGA of STC
• L2STTTrack simulates track fitting in the TFC
• L2STTVertex simulates the Vertex Card
• package tsim_l2stt released in CVS

3
tsim-L2STT block diagram (general)
STR.Boston STT
CFT
SMT
tsim_L2STT steering Class
CFT Roads SMT Hits in Road
SMT Hits Clustering
Vertex
Tracking
L2STTNtuples
4
L2STT Cluster Algorithm (Algo I)
STR .Boston STT
Read SMT HDI,Chip ChanID,ChanADC
Subtract Pedestals / ChanADC lt Threshold
Calc. NSum(ChanIDChanADC DSum(ChanADC)
ChanID Neighbohr?
NOEnd Cluster
YESRead Next Channel
Calc. N/D LUT
ClusterSize
Store into Buffer Clusters
ClusterSize 0
End Event?
YESSend Buffer Clusters to Road/Hit Filter
NO Start Next Cluster
5
L2STT Cluster Algorithm (Algo II)
STR.Boston STT
Read SMT HDI,Chip ChanID,ChanADC
MAX Next 5 Chan
Store on local Buffer ChanID,ChanADC
ChanID Neighbohr?
NOEnd Cluster
YES Next Chan
Calc. Max. ADC ChanIDSeed Calc.Centroid
(LUT_Uli)
Store into Buffer Clusters
End Event?
YESSend Buffer Clusters to Road/Hit Filter
No Start Next Cluster
6
Results of Cluster Algorithm in Trigger Simulator
withInput Monte Carlo events
STR.Boston STT

• tsim activated configuration consists of
  ............................ SMT input
• SMT Hits Clustering
• L2STTNtuples
• input files used .................................
  .................................... 50 Gev
  single track muons (1000 events)
  t tbar no min bias (500 events)
• 
  

7
Results (cont.)
STR.Boston STT

• Mean number of clusters /evt
  9.5 single muons .
  
  800 t tbar
• cluster size
  2.8
• cluster pulse height
  45
• hardware address - distributions of channel
  number .
  Chip number, HDI number, .
  Sequencer and Crate
  number . - do look OK

8
L2STT Clustering - 50Gev Muons (1000evts)
STR/6/99
9
L2STT Clustering - t tbar (500evts)
STR/6/99
10
Next
STR.Boston STT

• Study cluster occupancies in chips , HDIs etc vs
  kind of events ( single -tracks / t tbar / t tbar
  min bias )
• study clusters with very high size ( where do
  they come from - how often )
• study clusters with more than one maximum and
  improve Algos to calculate appropriate
  centroid(s)
• implement FPGA vsn of tsim Clustering (STT
  emulator)
• consider possible choices of LUT and implement
  LUT in Algo(s)
• improve Cluster Algo I
  _at_ activate Threshold cut
  through RCP _at_ parameterization of
  pedestals - uses one value slope per chip
  - see test beam
  results etc. -
• _at_ clusters on gt1 contiguous chip

11
Next (cont.)
STR.Boston STT

• noisy channels exclude from calc. of
  Centroid extrapolate value from
  neighbor channels
  _at_dead channels keep
  same cluster for channel neighbor to dead channel
  
• implement Cluster Algo II
• compare calculated hits to MC for efficiencies
  etc.
• do timing studies for each Algo and LUT
• .......now that SMT Hits are ready, need to get
  Hits in Roads
• and STT Tracks Classes need to be implemented