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Gain and Quantum Efficiency of a Cold Photomultiplier

Gain and Quantum Efficiency of a Cold Photomultiplier. run a Hamamatsu R7725 @ 4 K determine minimum heat load measure quantum efficiency and gain vs T … and vs frequency. Hans-Otto Meyer Indiana University 10/7/06. The Plan. base part 1. base part 2. warm. cold. light pulser.

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Gain and Quantum Efficiency of a Cold Photomultiplier

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  1. Gain and Quantum Efficiency of a Cold Photomultiplier • run a Hamamatsu R7725 @ 4 K • determine minimum heat load • measure quantum efficiency and gain vs T • … and vs frequency Hans-Otto Meyer Indiana University 10/7/06

  2. The Plan base part 1 base part 2 warm cold light pulser R7725 Monitor PM opt. fiber light splitter thermometer Enclosure (evacuated, submersed in cryo-liquid)

  3. existing at this time (9/27/06) PM under test Burle 8850 base warm light pulser Monitor (8575) opt. fiber light splitter data acquisition

  4. Light source LED (LITEON LTST-C150) λ = 467 nm n-channel Mosfet Splitter (imperfect splice in clear epoxy) mounted LED pulse width: ~10 ns

  5. setup

  6. measure quantum efficiency ne = 3.6 ne = 2.0 red curve: ne = 1.1 peak index ne = 0.52 determined once and for all ne = 0.10 ne = 0.034 ne(avg. number of photoelectrons) from fit Quantum efficiency: from ne PM gain: from peak locations

  7. measure gain ne= 1.055 gain ≡ 1.0 ne= 1.053 gain ≡ 1.6 ne= 1.055 gain ≡ 2.5 changing PM HV: gain changes, but ne stays the same

  8. monitor The monitor signal is proportional to the light emitted from the splitter

  9. R7725 split base signal +HV cold warm long leads How is performance affected? Ho to fix it?

  10. cooling T T2

  11. Project is on hold

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