mutr hv optimization riken/rbrc itaru nakagawa 1
Post on 28-Dec-2015
230 Views
Preview:
TRANSCRIPT
2
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%.
3
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.
8
MIP Peak Positions @ Nominal HV
oct1oct2 oct3 oct4 oct5 oct6 oct7 oct8
gap1gap2 gap3
St-1
St-2
St-3
12
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
13
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
18
MIP Peak Positions @ Nominal HV
oct1oct2 oct3 oct4 oct5 oct6 oct7 oct8
gap1gap2 gap3
St-1
St-2
St-3
21
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
24
Study From Run9
Run09 Run11
Data Beam Cosmic
HV Scan Nominal, +25V, +50V -30V, Nominal, +15V, +30V, +50VN/S 1.5% 1.0%
top related