ELOG CRIB

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

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Entry time:	Fri Mar 28 20:45:07 2025
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> Today the following was performed: > > ===F0=== > > Chamber pumps were turned on (though the chamber was still under marginal vacuum from previous exp of ~10 mbar). > > H2 gas was filled to check the windows at 551 Torr. After >6 hours, leak rate is ~1 Torr (~4 Torr / day). > > ===F3 PPACs=== > > The F3 chamber pressure was below 5 x 10^-4 Pa, extremely good for F3. Even with PPACs having gas, the baseline did not change. > > Strange behavior was seen with the evacuation of the gas system and connecting the gas system to the PPACs. There appeared to be pressure backflow frmm the pump. This causes > minor jitter in the current when bias was applied at first, and also strange temporal data. > > After lunch, we found the input to the pump has a very severe leak. Once it was replaced, the PPACs could be operated normal, including the expected spectra. It could be > possible the high discharge frequency and lower bias settings used, e.g., in 7Be THM exp in 2016.11 was partly due to this issue of contaminants in the gas. > > Now the chamber pumps were turned off, in case we open the chamber tomorrow. > > ===F3 DSSDs=== > > Now all the cabling is connected in both E7 and J1. Many more things are properly labeled. > > We had trouble to find all the signals generated via pulser in the DAQ. PSD1 data showed up right away. We could find PSD2 data after a change to the camac init script > inputs. The issue of PSD3 remains to be resolved (but at least there are no longer encoding errors, so perhaps it is a problem in ANAPAW. Encoding: HTML ELCode plain Suppress Email notification

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