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SB Summary

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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  1. SB Summary 4 March 2008

  2. 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.

  3. 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.

  4. 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?

  5. Not very conclusive in my opinion. • The next GEM of Shot #310 seems to have high gain. • What variable does any possible correlation reflect?

  6. 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!

  7. Installed in WS2

  8. Installed in WS3

  9. Installed in WN2

  10. Installed in WN3

  11. Installed in WN3

  12. 8107 Installed in WN4

  13. 8108 Installed in WN4

  14. Not installed

  15. 8110 Not installed

  16. Installed in WS4

  17. Installed in WS4

  18. Installed in WS4

  19. 8114 Installed in WS1

  20. 8115 Installed in WS2

  21. 8116 Installed in WS5

  22. 8117

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