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Stony Brook Update

Stony Brook Update. SB Crew Feb 19, 2008. Reference Gain Curve. Recall… The gain is the same in Israel and Stony Brook. The outlined brown circles are used as a reference gain for a “typical” stack. Relative Gain of “Test Stacks”.

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Stony Brook Update

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  1. Stony BrookUpdate SB Crew Feb 19, 2008

  2. Reference Gain Curve • Recall… The gain is the same in Israel and Stony Brook. • The outlined brown circles are used as a reference gain for a “typical” stack.

  3. Relative Gain of “Test Stacks” • The relative gain of all 18 “test stacks” made at SB in the last month. • compared to the “typical” reference stack (previous slide). • The gain is higher than we’ve seen in the past (w/o CsI). • No observed correlation to single GEM results. • (plot coming next week)

  4. Post-CsI, Test Stack 13 • Stack (157,168,161)tested over weekend. • many trips (56!) over 60 hrs. • After opening the box for scintillation cube maintenance, mid GEM is shorted.  • mid GEM was left cooking overnight… Raised voltage from 3750V to 3800V

  5. Scintillation Cube Measurements • The prototype scintillation cube is hooked up in the gain test box. • We have not yet successfully seen a triggered signal (due to trigger noise). • We have observed untriggered light signals with • Low P/T • Source in optimal signal position but not trigger position • The signal is low ~100mV • Working on getting a triggered signal. • The next generation cube, will use an Al + MgF2 reflector and will hopefully give us more photons to work with.

  6. Status • Pretest Station: Total of 19 stacks installed/tested. • 5 stacks installed in HBD west • 13/19 test stacks in the glovebox • 3 as yet untested. • 7 Au, 2 Cu left in vacuum storage • Next… Post-mortem on HBD east!!

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