Analysis of oct 04 test beam rpc data
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Analysis of Oct. 04 Test Beam RPC Data. Jay Hauser, Martin von der Mey University of California Los Angeles. RPCs in Test Beam. 1 RE1/2 (call it RE1) 2 free-standing (call them RE2, RE3) Readout info for experts only: RPC0  RE1 RPC3  RE2 RPC2  RE3. RE2, RE3 behind. RE1 on ME1/2.

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Analysis of oct 04 test beam rpc data
Analysis of Oct. 04 Test Beam RPC Data

  • Jay Hauser, Martin von der Mey

  • University of California Los Angeles


Rpcs in test beam
RPCs in Test Beam

  • 1 RE1/2 (call it RE1)

  • 2 free-standing (call them RE2, RE3)

  • Readout info for experts only:

    • RPC0  RE1

    • RPC3  RE2

    • RPC2  RE3

  • RE2, RE3 behind

  • RE1 on ME1/2

  • ME3/2

  • ME2/2

  • ME1/1

m-


Link board to rat board setup
Link Board to RAT Board Setup

  • RAT receives 4 cables, one from each RPC chamber

  • Cables 0, 1, 2 were connected

  • Appears that phasing RAT-TMB incorrect, so that 0  2 and 13 in readout

  • N.B. RE1 seems the healthiest chamber


Rpc rat interface
RPC-RAT Interface

  • RAT receives 4 cables with 20 pairs each (3 cables active at test beam)

  • For each cable/RPC chamber implemented:

    • 4 bits of bunch crossing

    • 12 bits of RPC pad data

    • 1 clock

    • (FYI CMS specification is 16 pads, 2 bx, 1 clock, 1 GND)

  • New full-size backplane was used


Data conditions
Data Conditions

  • Run conditions:

    • Link boards arrived Saturday p.m., run ended Sunday evening

    • Runs 535-548 have RPC data.

    • Data triggered by Sector Processor, not scintillators

    • Beam spot roughly 30 cm each dimension

    • RAT latches bits on falling edge of 40 MHz clock where they are stable

  • Analysis conditions:

    • Comparison CSC chamber always ME3/2 - part of SP trigger (ALCT&CLCT required)

    • Run 548 taken Sunday.

    • Corrupted RPC events not included

      • Seen at 1% level

      • Symptom: as if no RPC cables connected to RAT (?)


Tmb bunch crossings data
TMB Bunch Crossings - Data

  • Flat Distribution seen 0-15 (4 bits):

  • N.B. no ALCT or TMB data transmission errors (CRC check) seen in these runs


Internal rpc bxn diff
Internal RPC BXN diff

  • BXN difference for consecutive

  • RPC data arriving at TMB

  • Always incrementing by 1.


No crc errors for tmb alct
No CRC errors for TMB/ALCT

ALCT CRC

TMB CRC


Rpc bunch crossings expectations
RPC Bunch Crossings - Expectations

  • Emu electronics used orbit=924 bx, RPC used orbit=3564 bx

  • These are incommensurate.

  • What are lowest 4 bits if synch is perfect?

  • Therefore, expect various differences in jumps of 4 bx

  • In general, there can also be an offset due to time delay of BX0


Rpc bunch crossings data
RPC Bunch Crossings - Data

  • TMB vs RPC see perfect agreement with expectations.

  • At least, ALCT/CLCT bx reset/bx0 protocol = Link board protocol


Rpc bx from different rpc chambers
RPC BX from different RPC Chambers?

  • Nice diagonals, but offsets (2, 7 bx) due either to TTCrx offset or reset timing at Link board


Test clock sent to tmb
Test clock sent to TMB

Inverted RPC clock

sent to TMB (Runs=553,554)


Reset with sps orbit
Reset with SPS Orbit

  • Better agreement (run=563)

  • Still issues to understand


Beam spot size

Key ½-Strip

Key Wire Group

Key ½-Strip

Beam Spot Size

  • Data triggered by SP covers roughly 30x30 cm

  • (Scintillators are 10x10 cm)


Rpc configuration
RPC configuration

Run 562

(Wires 0-11)

Run 548

(Wires 9-20)


Re1 pad data quality

Key ½-Strip

RPC Pad

RE1 Pad Data Quality

  • Compare ME3/2 (rear chamber) CLCT key half-strips (not strips) to RE1 pad (vertical dimension)

  • Good position agreement (one dead pad)

  • Modest RPC efficiency within readout region

  • Fiducial region for RE1 select half-strips 65-100


Re1 efficiency within fiducial region

Key Wire Group

RE1 Efficiency Within Fiducial Region

  • Unsure exactly where pads are, so plot efficiency versus CSC wire group

  • This RPC chamber fairly efficient


Re2 pad data quality

Key ½-Strip

RPC Pad

RE2 Pad Data Quality

  • Same comparison

  • Active part of chamber appears far from beam centerlow statistics

  • Fiducial region: select half-strips 10-50


Re2 efficiency within fiducial region

Key Wire Group

RE2 Efficiency Within Fiducial Region

  • This RPC chamber not so efficient


Re3 pad data quality

Key ½-Strip

RPC Pad

RE3 Pad Data Quality

  • Same comparisons

  • Fiducial region: select half-strips 80-115


Re3 efficiency within fiducial region

Key Wire Group

RE3 Efficiency Within Fiducial Region

  • RE3 efficiency reaches a high value, but is not flat with wire number



Rpc versus alct timing

RE2

RE3

RE1

RPC versus ALCT Timing

  • First RPC hit per chamber:

  • RE1, RE2 all in one BX

  • RE3 not as good

  • Note RE1 later by 1 BX


Rpc afterpulsing
RPC Afterpulsing?

  • Number of time bins per chamber per event

  • RE1 and RE2 good, RE3 shows considerable after-pulsing:

RE2

RE3

RE1


Rpc pads hit

RE2

RE3

RPC Pads Hit

  • Pads hit per event (summed over time bins)

  • All look okay (RE1 slightly more pads)

RE1


Summary
Summary

  • RPC Link Board to RAT-TMB data transmission worked well

  • RPC pads well correlated to CSC position

  • Timing looks strange on one RPC chamber

  • RPC efficiency hard to study

    • Instrumented region was small

    • Gas was not optimal due to safety concerns

    • Will be useful to do simultaneous analysis of RPC data taken through Link board readout – is it possible to double-check?

  • N.B. time for doing tests was way too short. Is there some way to set up a cosmic ray test bench for a longer time?


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