july 19, 2006vlcw-06 vancouver1 scint/mapmt muon prototype operation robert abrams indiana...
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July 19, 2006 VLCW-06 Vancouver 1
Scint/MAPMT Muon Prototype Operation
Robert Abrams
Indiana University
July 19, 2006 VLCW-06 Vancouver 2
Outline
• Current Status
• Detector Setup and Layout
• ADC Calibration Procedure
• Measurement Plan
• Data Analysis and Preliminary Results
• Next Steps and Conclusions
July 19, 2006 VLCW-06 Vancouver 3
Current Status of Testing
• Four (1.25m X 2.5m) prototype modules built at Notre Dame in 2005.
• Detector is set up in Fermilab test beam (MTEST or MTBF)
• Short test run in February, some preliminary results presented at LCWS06 in Bangalore in March.
• Just finished a run, from end of June to mid-July.• There have been some problems, mainly DAQ-related.
Significant time spent investigating source of problem.• Respectable amounts of data collected, not all analyzed
yet.• Plan to request another week in August, and more
testing toward the end of 2006.
July 19, 2006 VLCW-06 Vancouver 4
Muon Detector Setup
July 19, 2006 VLCW-06 Vancouver 5
Monitoring and Positioning
96 inch horizontalmotion along rail,Hydraulic scissorsjack cart has 45 inchvertical travel.
Position monitoringwith 2 commercialLaser levels.Horizontal line atbeam height, andvertical line alongbeam line. LinesIntersect at beam
Position.
Video monitor andMotor controls forremote adjustment
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4322
64
1
4322
64
Clear fibers to cookie (S+ Readout Side)
Clear fibers to cookie (S- Readout Side)
Cookie
Prototype S+Strips at +45º
Prototype S-Strips at -45º
1
MAPMT
Single Module Layout
S+
S-
July 19, 2006 VLCW-06 Vancouver 7
Prototype D+Strips at +45º.Fibers from farEnd go to D+b
Prototype D-Strips at -45º.Fibers from farEnd go to D-b
4322
64
1
Clear fibers to cookie (D-b Readout Side)
Clear fibers to cookie (D-a Readout Side)
D-a
D-b
4322
64
1
Clear fibers to cookie (D+b Readout Side)
MAPMTCookie
Clear fibers to cookie (D+a Readout Side)
D+b
D+a
Fibers to
D+
aD+
b
Fibers
Fibers to D
-a
D-b
Fibers
Layout of Dual Readout Modules
July 19, 2006 VLCW-06 Vancouver 8
Calibration of ADCs
• Pulser to 12X fanout to 12 ADCs at a time.
• Record pulses on digital scope and Integrate to get charge.
• Bypass the 10X amplifiers used in beam tests to stay within ADC ranges.
• Measure response at ADC
• Calibrate with 3 different pulses.
• Compare to LeCroy spec: 0.25 pC/chan
July 19, 2006 VLCW-06 Vancouver 9
Integral of 900mV 8ns Pulse
-40
-30
-20
-10
0
10
-1.00E-08
0.00E+00
1.00E-08
2.00E-08
3.00E-08
Seconds
(Vo
lts/
0.02
*10*
*-9)
sec
Pulse Integral
7.25 e-09 V-secQ = 145 pC
Integral of 600 mV 4 ns Pulse
-15
-10
-5
0
-2.00E-08
-1.00E-08
0.00E+00
1.00E-08
2.00E-08
Time (Sec)
Vo
lts/
(0.0
2*10
**-9
) S
ec
Integral
2.77 e-09 V-secQ = 55.4 pC
ADC Calibration
0
0.1
0.2
0.3
0.4
0.5
0 10 20 30
ADC Channel
pC
per
AD
C C
ou
nt
55.4 pC Pulse
ADC Calibration
0
0.1
0.2
0.3
0.4
0.5
0 10 20 30
ADC Channel
pC
per
AD
C C
ou
nt
145 pC Pulse
900 mV 8 ns Pulse
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
-1.00E-08
0.00E+00
1.00E-08 2.00E-08 3.00E-08
Calibration Pulse
600 mV 4 ns Pulse
-0.8
-0.6
-0.4
-0.2
0
0.2
-2.00E-08
-1.00E-08
0.00E+00
1.00E-08
2.00E-08
Seconds
Vo
lts
Series1
6
Pulses and ASC Calibrations
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900 mV 14 ns Pulse Integral
-60-50-40-30-20-10
010
-1.00E-08
0.00E+00
1.00E-08
2.00E-08
3.00E-08
Seconds
(Vo
lts/
0.02
*10*
*-9)
Sec
Pulse Integral
107.2 e-10 V-sQ=214 pC
ADC Calibration
0
0.1
0.2
0.3
0.4
0.5
0 10 20 30
ADC Channel
pC
per
AD
C C
ou
nt
214pC Pulse
900 mV 14ns Calibration Pulse
-1-0.8-0.6-0.4-0.2
00.2
-1.00E-08
0.00E+00
1.00E-08
2.00E-08
3.00E-08
Seconds
Vo
lts
Calibration Pulse
July 19, 2006 VLCW-06 Vancouver 11
Measurement Plan
• Position detector so that beam hits particular (+, -) pairs of counters.
• Measure: – multiple strips with beam at center or
comparable points– at different positions along strips. – near boundaries between strips
• Also record coincidence rates of each signal with beam with CAMAC scalers.
July 19, 2006 VLCW-06 Vancouver 12
Schematic Measurement Grid
+22 +26 +30 +34 +38 +42 +46 +50 +54 +58
-22 -26 -30 -34 -38 -42 -46 -50 -54 -58
HorizontalScribed Lines
So far we have concentrated on +/- 22 to +/- 42, at 4 Strip intervals.Some runs had low statistics and need to be repeated.
o o o o o o
o o o o o
o
o
o
o
o
o
o
o
o
o
oo
o
o
o
o
o
o
o
o
o
o
o
o
July 19, 2006 VLCW-06 Vancouver 13
Data Processing
• Problems with DAQ resulted in badly structured ADC distributions and double peaked (split) pedestal distributions.
• Intermittant problem due to 5th bit failing to clear for beam and cosmic ray triggers.
• Problem did not occur for pulser triggers.• Filter out events with bad pedestals• Apply pedestal subtraction• Apply ADC calibration. Compensate for 10X
amplifiers.
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Run 6103 Before Cuts
Bad Structures present in signal channels, some pedestals are split
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Run 6103 After Cuts on Split Pedestals
Events with ADC19 < 80. This run was at strips (+42, -34)
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Preliminary Result:Response at Points Along Strip +42
Response Along Strip +42
012345678
22 26 30 34 38 42 46 50 54
Crossing (-) Strip Number
Mea
n C
har
ge
(pC
)
S+
D+a
D+b
Strip +42 Sum of a and b Means
012345678
22 26 30 34 38 42 46 50 54 58 62
Crossing Strip Number
Mea
n C
har
ge
(pC
)
S+
D+(a+b)
Response Along Strip +42
0
2
4
6
8
0 25 50 75 100 125 150 175
Distance from Readout End (cm)
Mea
n C
har
ge
(pC
)
S+
D+a
D+b
Photelectron Yields:
D+a or D+b separately: ~ 5 PEsD+a and D+b combined: ~ 10 PEsS+: ~14 PEs
July 19, 2006 VLCW-06 Vancouver 17
Preliminary Result:Response at Strip Centers
Response at Centers of Strips
0
2
4
6
8
10
20 30 40 50
Strip Number
Mea
n C
har
ge
(pC
)S+
D+a
D+b
D-a
D-b
S-
Strips 22 to 42 are equal length, 1.77m long
July 19, 2006 VLCW-06 Vancouver 18
Next Steps
• Continue to test modules• Calibrate MAPMTs to be able to correct for gain
variations.• Implement LED/PIN calibration and monitoring
system• Replace Lecroy ADCs with version of Minerva
front end digitizers.• Possibly build additional prototypes with faster
wavelength shifters, different scintillator extrusions.
• Test with new digitizers
July 19, 2006 VLCW-06 Vancouver 19
Conclusions
• Gained experience in use of test beam• Data collection rate is limited to ~40/sec by
CAMAC/DAQ. Requires 1-2 hours per 12000 event point.
• Need to replace aging CAMAC system.• Additional running time needed.• Preliminary results indicate we should be able to
extract useful information about performance of prototypes
• ADC distribution shown at Bangalore was structured due to split pedestal problem.
July 19, 2006 VLCW-06 Vancouver 20
Acknowledgements
• Fermilab Mechanical and Electrical Departments, Electronics Shop for help with Motion table and installation
• Erik Ramberg, for MTEST and DAQ support• Gene Fisk for providing Fermilab support, and for help
with planning and runs. • Caroline Milstene for help with runs and software
contributions• Amy Roberts, grad student from Notre Dame, for help
with setup and runs• Alfredo Gutierrez from Wayne State for help with runs