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MuTr HV Optimization

RIKEN/RBRCItaru Nakagawa

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Goal

• Find out HV to achieve Noise RMS/MIP peak (N/S) = 1%.

• Gain can be similar to chambers, but noise distributions are unique from chamber to chamber.

• Historically MuTR has been operated with only three HV settings (St1=1875V, St2=1900V, St3=1925V)

• Vary HV channel by channel basis to set N/S ~ 1%.

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Cosmic Data TakingHV Setting # Triggers

-30 V 2M

Nominal (St1:1875V, St2:1900V, St3:1925V) 3M

+15V 3M+30V 3M+50V 3M

•Dedicated Measurements : Dec.23 ~ Jan. 11•MuIDLL1 N1D||S1D trigger : 60Hz ~ 120Hz •Work area: phnxmutr@va020:/data2/SubSystems/phnxmutr/itaru/MipAna•README for instruction

Event Selection:1. Peak Strip ADC of Cluster. 2. No track required.

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North Arm

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Station-1Oct.1

Oct.2

Oct.3

Oct.4

Oct.5

Oct.6

Oct.7

Oct.8

Gap-1 Gap-2 Gap-3

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Station-2Oct.1

Oct.2

Oct.3

Oct.4

Oct.5

Oct.6

Oct.7

Oct.8

Gap-1 Gap-2 Gap-3

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Station-3Oct.1

Oct.2

Oct.3

Oct.4

Oct.5

Oct.6

Oct.7

Oct.8

Gap-1 Gap-2

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MIP Peak Positions @ Nominal HV

oct1oct2 oct3 oct4 oct5 oct6 oct7 oct8

gap1gap2 gap3

St-1

St-2

St-3

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Pedestal RMS (North Station-1)

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Plane Averaged Pedestal RMS [ch]

oct1oct2 oct3 oct4 oct5 oct6 oct7 oct8St-1

St-2

St-3

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Noise RMS/MIP Peak @ Nominal HV

St-1

St-2

St-3

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N/S .vs Operation Voltage

Noise RMS / MIP Peak ADC [%]

St-1

St-2

St-3

Nom

inal

+ A

dditi

onal

Vol

tage

[V]

Linear Fit

nominal+15V

+30V+50V

-30V N/S : 2% -> 1% Needs additional 110V

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N/S~1% Required Voltage : Nominal + ?V

St-1

St-2

St-3

+50V limit

St-2, St-3 planes are averagedover common HV chain

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South Arm

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Station-1Oct.1

Oct.2

Oct.3

Oct.4

Oct.5

Oct.6

Oct.7

Oct.8

Gap-1 Gap-2 Gap-3

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Station-2Oct.1

Oct.2

Oct.3

Oct.4

Oct.5

Oct.6

Oct.7

Oct.8

Gap-1 Gap-2 Gap-3

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Station-3Oct.1

Oct.2

Oct.3

Oct.4

Oct.5

Oct.6

Oct.7

Oct.8

Gap-1 Gap-2

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MIP Peak Positions @ Nominal HV

oct1oct2 oct3 oct4 oct5 oct6 oct7 oct8

gap1gap2 gap3

St-1

St-2

St-3

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Plane Averaged Pedestal RMS

oct1oct2 oct3 oct4 oct5 oct6 oct7 oct8St-1

St-2

St-3

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Noise RMS/MIP Peak @ Nominal HV

St-1

St-2

St-3

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N/S .vs Operation Voltage

Noise RMS / MIP Peak ADC [%]

St-1

St-2

St-3

Nom

inal

+ A

dditi

onal

Vol

tage

[V]

Linear Fitnominal

+15V+30V+50V

-30V

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N/S~1% Suggested Voltage : Nominal + ?V

St-1

St-2

St-3

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HV Configuration File

phoncs@va011:~/hv_stuff/hvcontrol_MutrN(S)

Copy & paste

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Study From Run9

Run09 Run11

Data Beam Cosmic

HV Scan Nominal, +25V, +50V -30V, Nominal, +15V, +30V, +50VN/S 1.5% 1.0%

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HV Set to be N/S ~ 1.5% (North)

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Cosmic vs Beam (Absolute)

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SN vs HV (North)

nominal

+25V

+50V

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Conclusion

• MuTr Gain .vs HV were evaluated using HV scan data with cosmic

• HVs are optimized to set N/S to be 1%.• New HV will be configured soon.• Will confirm N/S really comes as it desired

with further data taking.• Need to confirm with beam data as well.