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ILC Prototype Muon Scintillation Counter Tests

ILC Prototype Muon Scintillation Counter Tests. Robert Abrams Indiana University. Introduction. Collaboration: FNAL, IU, UND, WSU, (UCDavis) Testing program was first reported at Stanford, LCWS05, using a small pre-prototype.

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ILC Prototype Muon Scintillation Counter Tests

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  1. ILC Prototype Muon Scintillation Counter Tests Robert Abrams Indiana University R. Abrams LCWS06 Bangalore

  2. Introduction • Collaboration: FNAL, IU, UND, WSU, (UCDavis) • Testing program was first reported at Stanford, LCWS05, using a small pre-prototype. • At Snowmass, ALCPG05, results of source tests and cosmic ray tests of 2 quarter-sized prototype modules were reported. • At this time, there are 2 more prototype modules, with dual readout. • Results of pulse shape studies will be presented. • The set of 4 modules has been installed in the FNAL test beam, and preliminary results will be presented. • Future plans will be presented. R. Abrams LCWS06 Bangalore

  3. Test Setup as reported at Snowmass Proto #1 with MAPMT, Proto #2 with Single PMT Proto #1 with Single PMT. Cosmic ray trigger paddles Single Anode PMT: Hamamatsu E934-01 64-element MAPMT: Hamamatsu H7546B R. Abrams LCWS06 Bangalore

  4. Prototype Muon Detectors(Snowmass) • Module dimensions 1.25m x 2.5m • Constructed at University of Notre Dame • 64 scintillator strips per module • 2 modules built, +/- 45 degrees • Strips #22-43 same length across entire width • Wavelength shifter fibers in grooves spliced to clear fibers that run from scintillator to cookie. • 9 sets of LED-driven fiber bundles illuminate ends of all strips for monitoring • Proto #S2 has PIN photodiodes to monitor LEDs R. Abrams LCWS06 Bangalore

  5. 64 44 43 22 21 1 1 21 43 22 44 64 Single Readout Module Layout MAPMT Prototype #S1 Cookie Clear fibers to cookie (Readout Side) Clear fibers to cookie (Readout Side) Prototype #S2 MAPMT Cookie R. Abrams LCWS06 Bangalore

  6. Clear fibers to cookie (2nd Readout Side) (b) 64 MAPMT Cookie 44 43 22 21 (a) Clear fibers to cookie (Readout Side) 1 1 Clear fibers to cookie (Readout Side) (b) 21 43 22 44 MAPMT Cookie 64 (a) Clear fibers to cookie (2nd Readout Side) Layout of New Dual Readout Modules Prototype #D2 Prototype #D1 R. Abrams LCWS06 Bangalore

  7. MAPMT Connections (Snowmass Configuration) External cabling Interior of connector box R. Abrams LCWS06 Bangalore

  8. New Connector Board and Box MAPMT base soldered to board Internal wires in board (4 layers). 4 connectors, each has 16 signals Internal jumper cables to external Multipin connectors New cookie design allows for magnetic shielding and better light seal at MAPMT R. Abrams LCWS06 Bangalore

  9. Study of Pulse Shapes • Investigated pulse shapes of signals from detectors to determine if time-over threshold could be used for signal size R. Abrams LCWS06 Bangalore

  10. Sample Traces from Cosmic Ray Triggers CH1 is MAPMT on Counter S2, Strip #22 (Blue trace) CH2 is SAPMT (Single Anode PMT) on Counter S1 (Magenta trace) Data from 11/3/05 10 mV/div 20 ns/division 20 mV/div 5 mV/div 20 ns/division R. Abrams LCWS06 Bangalore

  11. Observations • Structures are seen on traces from the prototype counters • Both the SAPMT and the MAPMT traces show structures • Structures appear over a ~50 ns interval • Pulse is more structured than expected if source is ringing. • Connections to SAPMT are different from those of MAPMT, suggesting not from impedance mismatch on MAPMT connections R. Abrams LCWS06 Bangalore

  12. SAPMT Traces and Paddle Traces 10 ns/div, 10 mV/div 10 ns/div, 20 mV/div Paddle trace is on CH2, an 8”x8” scintillator with an 8575 PMT (magenta trace) Cosmic ray trigger No structures on paddle traces R. Abrams LCWS06 Bangalore

  13. Summary of Pulse Shape Studies • Structures seen in traces seem to be from a fundamental property of the scintillation counters, and not specific to the MAPMTs or the connections to the MAPMTs • A plausible explanation is that they are due to multiple re-emissions of scintillator light from the wavelength-shifters, which have a decay time of ~11 ns. • We plan to test these (and other) scintillators with a faster wavelength shifter • We abandoned the time-over-threshold method R. Abrams LCWS06 Bangalore

  14. Assembly/Installation at MTEST R. Abrams LCWS06 Bangalore

  15. Installed in MTEST R. Abrams LCWS06 Bangalore

  16. Instrumentation for Tests • Altogether there are 6x64 anodes plus 6 dynodes (390 channels) • Of the 4 multipin connectors on each MAPMT box we connect only 1 connector at a time with an adapter to 16 coax connections. • Within each group of 16 coax connectors we connect 3 cables to the ADCs, and we run cables to each of the 6 dynodes, for a total of 24 active channels (24 ADC channels). • We chose to look at 3 adjacent strips at a time in each plane, to see the strip that is hit by the beam and the 2 adjacent strips. • Coincidence logic set up R. Abrams LCWS06 Bangalore

  17. Test Plan • Measure response of scintillator strips to uniform beam of charged particles. Use MTEST beam of 120 GeV protons. • Map out response vs position along lengths of strips and response for various strips. Compare single readout and dual readout modules. Avg number of photoelectrons. R. Abrams LCWS06 Bangalore

  18. Summary of Setup and Runs • 4 planes installed in MTEST Feb 20. • Cabling and logic completed for 24 channels. • Had ~2 shifts of data taking before shutdown on Feb 26. • Some units not fully working, but some preliminary results were obtained • We resume testing in June after shutdown. R. Abrams LCWS06 Bangalore

  19. Preliminary Result – ADC Spectrum, 5000 events • - Pedestal at ~channel 65, with 10X amplifier • Peaks at ~channels 95, 125, 155, 185, 215, 245, 275, … • Correspond to 1, 2, 3, 4, 5, … photoelectrons • Mean number of photoelectrons is ~6 • At 0.25 pC/channel, 30 channel separation between peaks yields gain of 4.5 x107 (amplified), or 4.5 x106 (unamplified) R. Abrams LCWS06 Bangalore

  20. Conclusions and Next Steps • Study of pulse shapes showed that time-over threshold is not feasible with these modules, need ADCs or other integrators for charge. • Apparatus now in MTEST, main testing in 2H06 • Plan to also test with Muons in MTEST • Plan to build on-detector digitizer/ADC • Future plans to build/test prototypes with faster W.L. shifter • Interested in using Si PMTs and compare with MAPMTs R. Abrams LCWS06 Bangalore

  21. Backup Slides – Snowmass Results R. Abrams LCWS06 Bangalore

  22. Update on Testing At FNAL • New Test Setup in Lab 6 with Fermilab Support • Testing Two New Prototype ILC Muon Counters from Notre Dame U. (#1 since 7/12/05, #2 since 8/10/05) • Tests of Single Scintillator Strip From NIU • MAMPT Installed, Testing has Begun, UC Davis Readout System w/CAMAC modules R. Abrams LCWS06 Bangalore

  23. Disc Disc ADC ADC BASIC LOGIC FOR DUAL MODULES Da Amp aANDb AND Scaler Db Amp Disc aORb AND Scaler Logic Gate Narrow Beam Wide ADC Gate Disc R. Abrams LCWS06 Bangalore

  24. Summary of Source Tests – Central Region • Found low yield from Proto #1, Strip 41, probable bad fiber splice • Rates decrease by 10-20% between strips 20 and 44 at constant distance along scintillator. Probably loss in clear fiber. 15% loss in 1.25m  7.7m attn length • Rates decrease by 20-25% along Strips. Corresponds to ~4-6m attn length in scintillator and wavelength shifter, as expected. R. Abrams LCWS06 Bangalore

  25. Cosmic Ray Test Results: Prototype #1 Mainly • ADC Spectra yield Means of 110-160 channels above pedestal at .25 pC/channel • Means correspond to ~6 to 8 P.E.s for M.I.P – a 2X improvement over pre-prototype • Typical ADC run has ~2% pedestals --> ~4 P.E.s • Proto #1 efficiency ~90% at disc threshold of 50 mV. Small Plateau. Proto #2 efficiency ~98% at 30-35 mV. • Currently Mapping ADC spectra with cosmic triggers R. Abrams LCWS06 Bangalore

  26. Tests of Single Scintillator Strip • Single 1m long strip provided by NIU • Wavelength shifter fiber extends 15 cm past end • PMT near end of shifter fiber • Tested with Cs137 source and cosmic rays • Source tests show attenuation length of ~4.6m. Nominal scintillator attenuation length is 5m. • Cosmic rays consistent with source tests • Measured ~8 PEs output R. Abrams LCWS06 Bangalore

  27. Scintillator Strip Data R. Abrams LCWS06 Bangalore

  28. Next Steps • Calibrate MAPMT • Use MAMPT with UCD readout system, study time over threshold to pulse height relation and response of individual strips. • Improve MAMPT connector box and add magnetic shielding • Test LED /PIN calibration system • Continue cosmic ray mapping • Test next set of prototypes that collect light at both ends of scintillator strips. R. Abrams LCWS06 Bangalore

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