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SB Summary. 4 March 2008. Update. 9 stacks have been installed. One more was tested which shows lower gain has not yet been installed. The scintillation cube has been evaporated onto. The trip recovery procedure was altered to increase wait time before ramp up.

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SB Summary

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Sb summary

SB Summary

4 March 2008


Update

Update

  • 9 stacks have been installed.

    • One more was tested which shows lower gain has not yet been installed.

  • The scintillation cube has been evaporated onto.

  • The trip recovery procedure was altered to increase wait time before ramp up.

  • The GEMs from the east have been washed.

  • Drift field studies are in progress.


Gem failures

GEM Failures

  • Last week we presented the hypothesis that the increase in GEM failures inside the test box was due to the old feed-through to power the light cube.

  • This has been confirmed.

  • Not just luck.


Do we understand the gain

Do We Understand The Gain?

  • We’ve become accustomed to gains > 20,000 with CsI and > 10,000 without at dV = 511

  • We got worried about WN4 with a post-CsI gain of <9000 and now we’ve tested a stack with gain of 11,000 (not installed yet)

  • Is water the mystery variable?

  • Is there an evaporation dependence to the post-CsI gain increase?


Sb summary

  • Not very conclusive in my opinion.

  • The next GEM of Shot #310 seems to have high gain.

  • What variable does any possible correlation reflect?


What s next

What’s Next?

  • We plan to complete instrumentation of the HBD west soon. A possible plan:

  • Power each module and make sure it holds voltage

  • Heat the glove box in an effort to remove water.

  • Close the vessel and use Bob’s gas system, to gauge the water content in N.

  • When we’ve reached an acceptable water level use Bob’s or the LEGS gas system to flow CF4 and power the whole detector for a long test (maybe only 7/10 at a time depending on the availability of HV feed-throughs).

  • HV from LeCroy - we need more modules!


Sb summary

Installed in WS2


Sb summary

Installed in WS3


Sb summary

Installed in WN2


Sb summary

Installed in WN3


Sb summary

Installed in WN3


Sb summary

8107

Installed in WN4


Sb summary

8108

Installed in WN4


Sb summary

Not installed


Sb summary

8110

Not installed


Sb summary

Installed in WS4


Sb summary

Installed in WS4


Sb summary

Installed in WS4


Sb summary

8114

Installed in WS1


Sb summary

8115

Installed in WS2


Sb summary

8116

Installed in WS5


Sb summary

8117


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