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Performance of PHENIX High Momentum Muon Trigger . Muon Tracker. 3. 2. 4. 5. 1. 6. 8. 7. Octant number. MuTR FEE Upgrade . Charge Sharing with multilple strips provides ~200um resolution out of 5mm strips

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Presentation Transcript
slide3

Muon Tracker

3

2

4

5

1

6

8

7

Octant number

mutr fee upgrade
MuTR FEE Upgrade

Charge Sharing with multilple strips provides ~200um resolution out of 5mm strips

Fast readout electronics process signal fast enough before trigger decision is made

Bottom Line

Readout Analog Signal to Get the Position of Particle Passage

(OFFLINE Analysis)

Readout Analog Signal to Get the Position of Particle Passage

(OFFLINE Analysis)

Get Digital Signal for Trigger Decision (ONLINE)

To trigger

Logic

~10s

0.05Q

ADC

Q

0.95Q

high momentum muon trigger system

Resistive Plate Counter

(RPC) (Φ segmented)

B

High Momentum MuonTrigger System

Trigger events with straight track

(e.g. Dstrip <= 1)

SG1

Level 1

Trigger

Board

Trigger

RPC

FEE

MuTRG

Data

Merge

Amp/Discri.

Transmit

Trigger

5%

Optical

MuTRG

MRG

DCM

MuTRG

ADTX

1.2Gbps

Trigger

2 planes

RPC / MuTRG data are

also recorded on disk.

MuTr

FEE

95%

Interaction Region

Rack Room

threshold scan
Threshold Scan
  • Good correlation between threshold and N.SG1. 1Hz is reasonable true cosmic rate.
  • Poor correlation between threshold and S.SG1. Not rates are not reproducible.
all octants thr 40mv
All Octants (Thr=40mV)

SG1South Trigger Rate

Expected trigger rate for cosmic ~1Hz]

Measurement and study by SeYoung and Dahee

masking octant 1 th r 40mv
Masking Octant-1 (Thr=40mV)

20min

Study by Dahee and SeYoung

observation so far
Observation So Far
  • Octant-1 which has intrinsic eigenvalue of [email protected]
    •    This high rate quenches completely by masking octant-1. Masking at LL1 or MRG doesn\'t matter.
  • Rate excursion up to >10kHz with 5 -10 minutes of lifetime originated Octant-3. Excursion repeats during the run.
logic test

Oct-1

HighRate

Oct-3

Excursion

Logic Test

ADTX

MRG

LL1

GL1

yes

yes

High Threshold

mask

mask

ADTX

MRG

LL1

GL1

no

no

no

yes

ADTX

MRG

10-13min

LL1

GL1

no

no

no

no

no

no

no

yes

yes

no

yes

yes

~60min

ADTX

MRG

LL1

GL1

no

no

yes

sg1 chain
SG1 Chain

1

9

6

5

4

2

8

7

FPGA

FPGA

3

Threshold

Mask

MRG

MTP

casset

MTP

fiber

LL1

ADTX

10

DCMIF

DCM

threshold scan1
Threshold Scan

Plot by Dahee

Threshold change every stations

all together.

North

SG1_South Rate [Hz]

Threshold change only station-3a

MRG#80 (rests are fixed at 40mV).

Threshold [mV]

  • The threshold scan result indicates clear threshold dependence.
  • The slope somewhat gets shallow between 30mV to 60mV.
  • Compared to North, South rate responses quite shallow and not normal response.
difference between previous and current mrg fpga code
Difference between Previous and Current MRG FPGA code

Upgrade : March 28, 2012

Run12: March 18 ~ April 18, 2012

sg1 octant 3 high rate excursion
SG1 Octant-3 High Rate Excursion

Plot by SeYoung (Ewha University)

20kHz

Frequency stays reasonably constant, whereas amplitudes vary by factor of 6 or so.

peak to peak intervals
Peak to Peak Intervals

Plot by Dahee

Intervals are constant within +/- 30 seconds. However their variations can not

be explained within the peak position error.

run13 threshold response of octant 1
Run13 Threshold Response of Octant-1

Run12 Octant-1 Cosmic SG1~50kHz

Run12 Octant-1 Physcs SG1~1kHz

South

Plot by Dahee (Ewha University)

North

Run12 Cosmic Rate ~40kHz is consistent with present measurement.

Physics run was operated at 30mV and likely to be operated around 1kHz.

sqrt s 500 gev @ rhic



sqrt(s)=500 GeV @ RHIC

Parity Violation Asymmetry

Clean flavor separation

w/o fragmentation uncertainty

high momentum muon trigger
High Momentum Muon Trigger

New Trigger

Upgrade

Run11 500 GeV Projection

σtot=60mb

L=1.5x1032cm-2s-1

Rate

9 MHz

BBCMuID Rejection Power

RP~100

Trigger Upgrade

RP ~ 45

90 kHz

W

RPtot ~ 4500

2 kHz

PHENIX Band Width for Muon

Required Rejection Power

MuID

Trigger

High Rejection Power

High Efficiency

new mutrig fee in north arm
New MuTRIG-FEE in North Arm

 Before Install

2008 Install

diagnosis
Diagnosis

Fiber swap btwn MRG&LL1

Antimask all octants✔

Threshold scan.✔

Angular distribution of cosmic✔

for mor e information
For more information
  • S. Adachi, et. al., Nuclear Inst. and Methods in Physics Research, A (2013), pp. 114-132
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