July 19, 2006VLCW-06 Vancouver1 Scint/MAPMT Muon Prototype Operation Robert Abrams Indiana...

July 19, 2006 VLCW-06 Vancouver 1

Scint/MAPMT Muon Prototype Operation

Robert Abrams

Indiana University


Outline

• Current Status

• Detector Setup and Layout

• ADC Calibration Procedure

• Measurement Plan

• Data Analysis and Preliminary Results

• Next Steps and Conclusions


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.


Muon Detector Setup


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


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-


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


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


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


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


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.


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


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.


Run 6103 Before Cuts

Bad Structures present in signal channels, some pedestals are split


Run 6103 After Cuts on Split Pedestals

Events with ADC19 < 80. This run was at strips (+42, -34)


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


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


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


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.


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

July 19, 2006VLCW-06 Vancouver1 Scint/MAPMT Muon Prototype Operation Robert Abrams Indiana...

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