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:

Thu Feb 24 14:31:25 2022

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15:30

1.5 MeV/u beam currently being tuned

Target is ON, setpoint = 135 K

System checks OK - white rabbit fail diff ~ 9

Temperatures OK

Merger OK

Data rate ~ 1400 kb/sec

Leakage current ~ 3.41 uA

Aida 1 and 2 missing channels from previous days appear working on stat layout 2 and xy pixel total plot (attachment 3)

17:12

Beam tuning complete. See attached Ex rate histogram.

The cryo compressor is being turned OFF for around 1 hour to remove any frozen nitrogen which may be the cause of the increased pressures observed.

Beam OFF to do so.

System checks OK - white rabbit fail diff ~ 9

Temperatures OK

Merger OK

Data rate ~ 200 kb/sec

Compressor OFF, setpoint on controller is 273 K

18:51

Pressure in the ring recovered quickly after closing valves to gas jet (attachment 5)

Increasing temperature caused a large spike in pressure in the inlets. E1 turbo briefly shut down due to the pressure increase, since restarted and pressure back in the -4 mbar range. (attachment 6)

Temperature being decreased

Beam back ON

data rate ~ 1500 kb/sec

merger OK

Temperatures OK

System checks OK - white rabbit diff ~ 12

21:58

After cooling the jet target, expected density is not achieved. E4 pressure is ~4E-10 mbar compared to ~2E-8mbar previously. Temperature reduced to 127K E4 pressure increases however stilll within -10 mbar range.

With beam on target we see rutherford peak at ~3 MeV, however it is much reduced.

Beam OFF to investigate inside the cave.

Decreasing temperature of nozzle in 0.5 k steps to see effect on E4 and S1 dump.

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