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Stony Brook Update: Recent Experiment Findings on Voltage Stability

An update on recent experiments involving the installation of the "Frankenstein" stack and voltage adjustments to improve stability. Observations include stack performance after CsI deposition and concerns about gain drops post-evaporation. Stay informed on the latest developments.

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Stony Brook Update: Recent Experiment Findings on Voltage Stability

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  1. Stony BrookUpdate Tent Crew Feb 26, 2008

  2. Post-CsI, Frankenstein Stack (4,254,165) Vin=3800V Vin=3700V • Homemade lemo feedthrough was removed from gain box. • GEMs seem more stable (although not in this plot… just wait!) • “Frankenstein” stack was installed on Thursday • After continuous tripping at 3800V, voltage was lowered to 3700V for the night.

  3. Post-CsI, Frankenstein Stack (4,254,165) Vin=3800V • On Friday, voltage was raised back to 3800V. • Bizarre: 88 trips in 3 hrs overnight… ??? (no P/T correlation) • Then relatively stable for the next 1.5 days.

  4. Post-CsI, Frankenstein Stack (4,254,165) • On Sunday a final test was initiated at 3800V. • 0 trips in 20 hours. • Installed in WS4 Monday afternoon.

  5. Reminder • The second-to-last CsI deposition was one we wanted to keep an eye on. • 25% decrease in WN4 after CsI was evaporated • (although the QE test looked just fine)

  6. An interesting observation… • While there was no other stack from that evaporation that didn’t develop a short, there was one other stack that we were able to test before it went bad. • This other stack also showed ~25% lower gain. • pre-CsI(dV=511V) ~11000, post-CsI(dV=511V) ~8000. • Was something wrong with this evaporation???

  7. Status • After removing the homemade lemo feedthrough from the gain test box, stacks are stable again. • “Frankenstein” stack (4,254,165) installed, WS4. • Test stack #12 was stable late yesterday evening @ 3800V • Currently undergoing gain test. • On the only two stacks from Evaporation “shot 308” that were tested, both showed ~25% drop in gain. • All other stacks from all other shots have a post-CsI gain ~30000. • Is this a cause for concern???

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