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:

Sun Feb 27 22:03:51 2022

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23:00

Target Temperature setpoint 95 K

Current in the ring ~ 5e7 pps

Rutherford rate appears to fluctuate by 2 ordera of magnitude depending on target density. Rate currently ~10^2 counts per 20s. (attachmet 1) can vary to nothing (attachment 6). When consistently low will increase temperature

Effect of target density can be observed in beam current plots. (attachment 7). When rutherford rate is high, beam current tends to decrease over the shot. When the rate is low the current maintains a level throughout.&nbsp;

Merger OK

Data rate ~ 800 kb/sec. Current run 78

Leakage current ~3.24 uA

Temperatures OK

System Checks OK - white rabbit fail attached

23:36

Rutherford rate consistently low. Maximum rate was just below 10^2 counts, only lasted for one beam shot then low count rates &lt; 10^1 counts.

Setpoint increase to 125 K.&nbsp;

Increase in pressure across the board in gasjet after increasing temperature which reduces fairly rapidly after 5 minutes. Current in E1 pump reduced from 2.7 A to 2.3 A at 125k.&nbsp;

Rate at 125K attachment 8. Appears stable.

23:49

Setpoint decrease to 115 K,

23:56

Temperature now stable at 115K. Rate has increased to ~10^2 counts per 20 secs and appears stable (no large fluctuations). Will keep at this level to see if it can be maintained for significant time period.

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Attachment 1: