13 March 2007G. Rakness (UCLA) 1 RPC efficiency in RAT Greg Rakness University of California, Los Angeles UCLA phone meeting 13 March 2007.

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Presentation transcript:

13 March 2007G. Rakness (UCLA) 1 RPC efficiency in RAT Greg Rakness University of California, Los Angeles UCLA phone meeting 13 March 2007

G. Rakness (UCLA) 2 Tracking through the numbers, making cuts… MTCC phase II Run 4188: 2.5M triggers events with “something” in ME1 = 0.5M events with “something” in ME+1/3/30 = 53k Raw chamber multiplicity… Occupancy in ring ME+1/3… N.B. “something” = ALCT, CLCT, LCT, RecHit, or segment…

13 March 2007G. Rakness (UCLA) 3 Tracking through the numbers, making cuts… Occupancy in ring ME+2/2… events with exactly 2 chambers with “something” (including ME+1/3/30) = 26k events with something in ME+1/3/30 and ME+2/2/30 = 12.6k events with exactly one segment in both ME+1/3/30 and ME+2/2/30 = 10.5k Segment multiplicity in ME+2/2/30…

13 March 2007G. Rakness (UCLA) 4 Illumination histograms for events with exactly 1 segment in ME+1/3/30 and ME+2/2/30 ME+1/3/30ME+2/2/30 Things to note… edge of ME+1/3/30 overlaps with HV division in ME+2/2/30 HV divisions overlap ME+1/3/30 “carves” out region in ME+2/2/30 Distributions of average RecHit positions:

13 March 2007G. Rakness (UCLA) 5 Interpolate  position at RPC Use average value of RecHits to draw straight line between ME+1 and ME+2… Y vs. X at Z = 712cm Things to note: HV divisions in CSC project into RPC (large  region where) CSC is active is <  < 0.75

13 March 2007G. Rakness (UCLA) 6  position with RPC bit in RAT Project  from ME+1 to ME+2, and require RPC data in RAT… Y vs. X at Z = 712cm Things to note: HV divisions appear to be different in RPC than in CSC… (large  region where) RPC is active is 0.74 <  < 0.75

13 March 2007G. Rakness (UCLA) A1A2 B1B2 C1C2 Chamber Strip LB Input Channel A1 A2 B1 B2 C1 C2 Connector Box strip 0strip 31 Recall: RPC Endcap Link Board Mapping K. Bunkowski (Warsaw) Configuration of LB in MTCC phase II was found to have a bug…  OR of 4 bits instead of 8

13 March 2007G. Rakness (UCLA) 8 RPC efficiency in RAT  =  =  = 0.75  =  = 0.75  = 0.74 CSC HV segment fiducial volume constraints: 1107/2068 = 54% RPC HV segment fiducial volume constraints: 797/805 = 90% …Efficiency depends on fiducial volume selected…  Significantly larger value within RPC HV segment

13 March 2007G. Rakness (UCLA) 9 Recall: RPC LB timing in TMB FIFO Estimates not conclusive…  Need to make measurement of relative latency between RPC LB and CSC pretrigger Propose to: 1.Minimize programmable delay in RPC LB data path 2.Reduce time for RPC LB data decoding in TMB firmware 3.Use programmable delay in TMB to time in both sides of RPC LB data peak  RPC data are late into TMB FIFO ALCT*CLCT pretrigger arrives here Time bin of RPC data (bx) RPC pad multiplicity  1