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Scintillators: Setup, performance and lessons learned Ran Hong - PowerPoint PPT Presentation

Oct 31, 2023 •445 likes •624 views

Scintillators: Setup, performance and lessons learned Ran Hong CENPA, University of Washington Scintillator/Light-guide Setup PMT Setup Signal reading Scintillator Setup ScR Beam Veto ScL Scintillator Setup Easy to

  1. Scintillators: Setup, performance and lessons learned Ran Hong CENPA, University of Washington

  2. • Scintillator/Light-guide Setup • PMT Setup • Signal reading

  3. Scintillator Setup ScR μ Beam μ Veto ScL

  4. Scintillator Setup • Easy to change Scintillator angle, but hard to change it’s height, impossible to change its horizontal position • Tiny shift between ScL and SiL • Very hard to mount the light guides after the scintillators are glued on

  5. Light guide configuration Plastic Light Guide Torr Seal: Cause severe leak! Aluminum/Stainless steel sleeve Sealed by pressure/friction: plastic to metal KF40 flange Diff. Pumping port

  6. Light guide leak LEAK!

  7. Fix the leak Newest Torr-seal, leaks most Easy Fix: Covering with excessive UHV sealant does not help UV cured optical glue

  8. PMT • PMT Module: XP2982 (datasheet elog:490) • Bias: -1800V (see elog:507) • 2 PMT bases broke, 1 person shocked! – ScR first, then Mu-Veto

  9. PMT Base Problem

  10. Why shocked? Cathode HV supply Dynodes HV cable GND Anode PMT Base GND Becomes HV!

  11. Signal of ScL/ScR/MuVeto ScL MuVeto Pictures are from elog:475 ScR ScL may be broken (elog:440)

  12. Signal of ScL/ScR/MuVeto Pulse shapes using FADC, elog:513,535

  13. Signal of ScL/ScR/MuVeto • Using BU digitizer to read the Scintillators (elog:539) – Ch0: muSC – Ch1: ScL – Ch2: ScR – Ch3: muVeto • For analysis: see whether we have good energy resolutions / good pulse shapes.

  14. Lessons learned • The seal between the light guide and its sleeve is flaky, the KF feed-throughs are OK. • PMT bases are fragile, need more careful handling. Check connections before biasing. Need more spare ones (or more robust ones). • FADC sample rate is not high enough for PMTs, need shaping amplifiers or faster digitizers. Analysis group should pay attention to the pulse shapes of the PMTs.

  15. Bonus: Si16

  16. Bonus: Si16 • Cover the bunch of cables with copper tape • Braids of the cables are isolated from the connector • Tricky to get rid of noise/ground loop (elog:599) • Achieved resolution using 1MeV pulser: 100 keV • Not be able to use Am241 to calibrate: The air attenuate the alpha particles too much (elog:607)

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