ELOG CARME

AIDA GELINA BRIKEN nToF CRIB ISOLDE CIRCE nTOFCapture DESPEC DTAS EDI_PSA 179Ta CARME StellarModelling DCF K40

CARME

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Entry time:	Sat Nov 8 21:10:27 2025
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> Attempted to activate 2xUHV1400 connected to bottom C4, channel #2 using P 200 W, t rise 30 min, t hold 90 min. > Temperature of Kapton bundle increased drastically to 160+ C. Had to stop. Conclusion is that these are likely > the two UHV1400 on the bottom of CARME, immediately in front of the Kapton bundle. > > Left the chamber to cool for a while. Baking temperature set to 85 C. > Repeated attempt using above parameters except P 150 W. Too hot. Had to decrease P to 75 W to remain below 150 C > on the Kapton bundle. Temperature on internals increases slowly, even with P 75 W. > Lesson learned: activate the UHV1400 next to the detectors last. Once on, temperature increase on the > detectors can be reduced but not stopped. > > Attempted to activate 2xUHV1400 on bottom C4, channel #3 using P 200 W, t rise 30 min, t hold 90 min. These > cannot be close to the detectors. > Possibly due to interference with #2 being on hold, temperature of internals starts increasing. Reduced P to 125 > W. OK. > Second lesson learned: temperature on internals is very hard to control once the UHV1400 close to them are > activated. Activate other UHV1400 first. > > Set #2 to hold 50 W. Set #3 to hold 50 W. > > Attempted to activate 3xUHV1400 on bottom C4, channel #4 using P 120 W, t rise 30 min, t hold 90 min. These > are definitely close to the detectors. > Temperature increase modest but noticeable. Activation completed before temperature increases > too much. > > 17:30 German time > Activation complete. All NEGs off simultaneously. > Heating power off. > > CARME slowly cools down (<10 C/h) > Opened some parts of the jacket to allow better cooling (still <10 C/h) > > Pressure reaches E-11 around 19:00 > SIP elements in D2000 still at 120 C. Too hot to turn on. > > SIP elements will be turned tomorrow morning. That should conclude this baking cycle. Encoding: HTML ELCode plain Suppress Email notification

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