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MuTr HV Optimization. RIKEN/RBRC Itaru Nakagawa. 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. - PowerPoint PPT Presentation
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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.