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RPC efficiency in RAT

RPC efficiency in RAT. Greg Rakness University of California, Los Angeles UCLA phone meeting 13 March 2007. Tracking through the numbers, making cuts…. MTCC phase II Run 4188: 2.5M triggers. Raw chamber multiplicity…. Occupancy in ring ME+1/3…. events with “something” in ME1 = 0.5M.

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RPC efficiency in RAT

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  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 Raw chamber multiplicity… Occupancy in ring ME+1/3… • events with “something” in ME1 = 0.5M • events with “something” in ME+1/3/30 = 53k N.B. “something” = ALCT, CLCT, LCT, RecHit, or segment… G. Rakness (UCLA)

  3. Tracking through the numbers, making cuts… Occupancy in ring ME+2/2… Segment multiplicity in ME+2/2/30… • 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 G. Rakness (UCLA)

  4. Illumination histograms for events with exactly 1 segment in ME+1/3/30 and ME+2/2/30 Distributions of average RecHit positions: ME+1/3/30 ME+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 G. 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 0.725 <  < 0.75 G. 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 G. Rakness (UCLA)

  7. Recall: RPC Endcap Link Board Mapping 15 31 Chamber Strip 0 0 strip 0 strip 31 A1 A2 15 Connector Box A1 A2 32 B1 B2 B1 B2 C1 C2 64 C1 C2 LB Input Channel 95 Configuration of LB in MTCC phase II was found to have a bug…  OR of 4 bits instead of 8 K. Bunkowski (Warsaw) G. Rakness (UCLA)

  8. = 0.75 = 0.725 = 0.75 = 0.74  = -1.28  = -1.17 RPC efficiency in RAT 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 G. Rakness (UCLA)

  9. ALCT*CLCT pretrigger arrives here Time bin of RPC data (bx) 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: Minimize programmable delay in RPC LB data path Reduce time for RPC LB data decoding in TMB firmware Use programmable delay in TMB to time in both sides of RPC LB data peak • RPC pad multiplicity  1  RPC data are late into TMB FIFO G. Rakness (UCLA)

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