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March 12, 2006R. Abrams LCWS06 Bangalore1 ILC Prototype Muon Scintillation Counter Tests Robert Abrams Indiana University.

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Presentation on theme: "March 12, 2006R. Abrams LCWS06 Bangalore1 ILC Prototype Muon Scintillation Counter Tests Robert Abrams Indiana University."— Presentation transcript:

1 March 12, 2006R. Abrams LCWS06 Bangalore1 ILC Prototype Muon Scintillation Counter Tests Robert Abrams Indiana University

2 March 12, 2006R. Abrams LCWS06 Bangalore2 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.

3 March 12, 2006R. Abrams LCWS06 Bangalore3 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

4 March 12, 2006R. Abrams LCWS06 Bangalore4 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

5 March 12, 2006R. Abrams LCWS06 Bangalore5 Single Readout Module Layout 2243 21 1 44 64 2243 21 1 44 64 Clear fibers to cookie (Readout Side) MAPMT Cookie Prototype #S1 Prototype #S2

6 March 12, 2006R. Abrams LCWS06 Bangalore6 Prototype #D2 Prototype #D1 2243 21 1 44 64 Clear fibers to cookie (Readout Side) MAPMT Cookie Clear fibers to cookie (2 nd Readout Side) (a) (b) 2243 21 1 44 64 Clear fibers to cookie (Readout Side) MAPMTCookie Clear fibers to cookie (2 nd Readout Side) (b) (a) Layout of New Dual Readout Modules

7 March 12, 2006R. Abrams LCWS06 Bangalore7 MAPMT Connections (Snowmass Configuration) External cablingInterior of connector box

8 March 12, 2006R. Abrams LCWS06 Bangalore8 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

9 March 12, 2006R. Abrams LCWS06 Bangalore9 Study of Pulse Shapes Investigated pulse shapes of signals from detectors to determine if time-over threshold could be used for signal size

10 March 12, 2006R. Abrams LCWS06 Bangalore10 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 20 ns/division 10 mV/div 20 mV/div 5 mV/div

11 March 12, 2006R. Abrams LCWS06 Bangalore11 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

12 March 12, 2006R. Abrams LCWS06 Bangalore12 SAPMT Traces and Paddle Traces Paddle trace is on CH2, an 8”x8” scintillator with an 8575 PMT (magenta trace) Cosmic ray trigger No structures on paddle traces 10 ns/div, 20 mV/div 10 ns/div, 10 mV/div

13 March 12, 2006R. Abrams LCWS06 Bangalore13 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

14 March 12, 2006R. Abrams LCWS06 Bangalore14 Assembly/Installation at MTEST

15 March 12, 2006R. Abrams LCWS06 Bangalore15 Installed in MTEST

16 March 12, 2006R. Abrams LCWS06 Bangalore16 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

17 March 12, 2006R. Abrams LCWS06 Bangalore17 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.

18 March 12, 2006R. Abrams LCWS06 Bangalore18 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.

19 March 12, 2006R. Abrams LCWS06 Bangalore19 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 x10 7 (amplified), or 4.5 x10 6 (unamplified)

20 March 12, 2006R. Abrams LCWS06 Bangalore20 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

21 March 12, 2006R. Abrams LCWS06 Bangalore21 Backup Slides – Snowmass Results

22 March 12, 2006R. Abrams LCWS06 Bangalore22 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

23 March 12, 2006R. Abrams LCWS06 Bangalore23 Amp Disc aANDb aORb Da Db Disc Beam ADC Narrow AND Scaler Disc Wide Logic Gate ADC Gate ADC BASIC LOGIC FOR DUAL MODULES

24 March 12, 2006R. Abrams LCWS06 Bangalore24 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.

25 March 12, 2006R. Abrams LCWS06 Bangalore25 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

26 March 12, 2006R. Abrams LCWS06 Bangalore26 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

27 March 12, 2006R. Abrams LCWS06 Bangalore27 Scintillator Strip Data

28 March 12, 2006R. Abrams LCWS06 Bangalore28 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.

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