13 March 2007 G. Rakness (UCLA)1

RPC efficiency in RAT

Greg RaknessUniversity of California, Los Angeles

UCLA phone meeting13 March 2007

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 2007 G. 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 2007 G. Rakness (UCLA)4

Illumination histograms for events with exactly 1 segment in ME+1/3/30 and ME+2/2/30

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

Distributions of average RecHit positions:

13 March 2007 G. Rakness (UCLA)5

Interpolate position at RPCUse 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

13 March 2007 G. Rakness (UCLA)6

position with RPC bit in RATProject 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 2007 G. Rakness (UCLA)7

95

15 3100

15

32

64

A1 A2

B1 B2

C1 C2

Chamber Strip

LB

Inp

ut

Cha

nnel

A1 A2

B1 B2

C1 C2

Connector Boxstrip 0 strip 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 2007 G. Rakness (UCLA)8

RPC efficiency in RAT

= -1.28 = -1.17

= 0.75

= 0.725

= 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 2007 G. Rakness (UCLA)9

Recall: RPC LB timing in TMB FIFOEstimates 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