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

2. July 19, 2006VLCW-06 Vancouver2 Outline Current Status Detector Setup and Layout ADC Calibration Procedure Measurement Plan Data Analysis and Preliminary Results Next Steps and Conclusions

3. July 19, 2006VLCW-06 Vancouver3 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.

4. July 19, 2006VLCW-06 Vancouver4 Muon Detector Setup

5. July 19, 2006VLCW-06 Vancouver5 Monitoring and Positioning 96 inch horizontal motion along rail, Hydraulic scissors jack cart has 45 inch vertical travel. Position monitoring with 2 commercial Laser levels. Horizontal line at beam height, and vertical line along beam line. Lines Intersect at beam Position. Video monitor and Motor controls for remote adjustment

6. July 19, 2006VLCW-06 Vancouver6 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-

7. July 19, 2006VLCW-06 Vancouver7 Prototype D+ Strips at +45º. Fibers from far End go to D+b Prototype D- Strips at -45º. Fibers from far End 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+a D+b Fibers Fibers to D-a D-b Fibers Layout of Dual Readout Modules

8. July 19, 2006VLCW-06 Vancouver8 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

9. July 19, 2006VLCW-06 Vancouver9 7.25 e-09 V-sec Q = 145 pC 2.77 e-09 V-sec Q = 55.4 pC Pulses and ASC Calibrations

10. July 19, 2006VLCW-06 Vancouver10 107.2 e-10 V-s Q=214 pC

11. July 19, 2006VLCW-06 Vancouver11 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.

12. July 19, 2006VLCW-06 Vancouver12 Schematic Measurement Grid +22 +26 +30 +34 +38 +42 +46 +50 +54 +58 -22 -26 -30 -34 -38 -42 -46 -50 -54 -58 Horizontal Scribed Lines So far we have concentrated on +/- 22 to +/- 42, at 4 Strip intervals. Some runs had low statistics and need to be repeated. oooooo ooooo o o o o o o o o o o oo o o o o o o o o o o o o

13. July 19, 2006VLCW-06 Vancouver13 Data Processing Problems with DAQ resulted in badly structured ADC distributions and double peaked (split) pedestal distributions. Intermittant problem due to 5 th 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.

14. July 19, 2006VLCW-06 Vancouver14 Run 6103 Before Cuts Bad Structures present in signal channels, some pedestals are split

15. July 19, 2006VLCW-06 Vancouver15 Run 6103 After Cuts on Split Pedestals Events with ADC19 < 80. This run was at strips (+42, -34)

16. July 19, 2006VLCW-06 Vancouver16 Preliminary Result: Response at Points Along Strip +42 Photelectron Yields: D+a or D+b separately: ~ 5 PEs D+a and D+b combined: ~ 10 PEs S+: ~14 PEs

17. July 19, 2006VLCW-06 Vancouver17 Preliminary Result: Response at Strip Centers Strips 22 to 42 are equal length, 1.77m long

18. July 19, 2006VLCW-06 Vancouver18 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

19. July 19, 2006VLCW-06 Vancouver19 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.

20. July 19, 2006VLCW-06 Vancouver20 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