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:

Fri Jun 6 17:27:03 2025

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Run 53 started at 18:25 (started already earlier but since then data is taken). Everything is running again. We started at 3E12 at/cm2. 
Side comment: Gleb told us 1h ago that he will switch to coasted mode and call us back as soon as he is done. So far he didn&#39;t call back and he is not in the office... So we decided to start data taking already. But: the software says that coasting mode is already on, but the graph looks like bunched mode... So we started data taking and will update this situation as soon as Gleb called us. -&gt; Update: Okay, we were the entire time in coasting mode

D+ beam deuterium target. D+ beam energy is now 0.25 MeV/u. (beam calc calculation is 0.2570 MeV/u).

All four detectors positioned fully out and stationary.

Left potentiometer = -2.76mm (corresponds to x = -2500, which is the more trustworthy value)

Right potentiometer = 1.77 mm (corresponds to y = 2500, which is the more trustworthy value)

Ring cycle time is 5 seconds.

Cooler set value = 146.25 V, 2 mA. Read value = 146.2 V, 0.00179 mA

All leakage currents look good.

Beam position. Vertical =0.0mm , Horizontal=-2.0 mm

Data rate ~ 812kB/s

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After starting the run we struggled because we did not know whether we can trust the beam overlap test after going from bunched mode to coasting mode. We therefore stopped data taking for approx. 1h to to this test once again in coasting mode, but did it via the Rutherford measurement. The result showed that the optimum is exactly the same: x=-2mm (see attachment 1).

However, we are strugglign with the areal density... It quickly dropped to 2E10 and slowly recovered in a more or less oscillating way (see attachment 2; the first four columns are the integrals of the four detectors, the next column is the sum of them. Afterwards its the average areal density and the last column is the total integral divided by the average areal density). 
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19:29: Storage turned back on 
Left potentiometer now = -2.79mm (corresponds to x = -5000, which is the more trustworthy value) 
 
19:53: Areal density dropped to 2E11, so we moved the left potentiometer once from x=-5000 to x=-4500. Sudden increase in pressure, but slow decrease again. 
19:59: Left potentiometer once from x=-4500 to x=-4000. Seems to be the right direction... But we do it slowly... 
 
20:19: Full check. Everything is okay, but areal density is still... aweful... Most of the time its between 1E11 and 1E12 at/cm2 
20:20: Left potentiometer once from x=-4000 to x=-3500. Seems again to be the right direction... Sudden increase from 7E11 to 2E12 
20:40: Everything stabilized at a higher average areal density. We are now fluctuating between 1E12 to 5E12. 
 
20:55: Left potentiometer once from x=-3500 to x=-3000. Seems again to be the right direction... Sudden increase from 9E11 to 3E12 
 
21:56: Full check. Everything is okay and areal density finally stabilized. Its now since 1h between 3E12 and 5E12. 
22:47: Full check. Everything is meraviglioso!

23:20&nbsp;

Checks OK

Target density remains stable around 5e12 at/cm2. Count rate has improved to around 200 c/h for 3He, 150 c/h for 3H and 80 c/h for 1H.

02:20

All checks OK

Count rates look pretty good, target density has maintained mid-high e12 lavel over last 3 hours.

peaks in spectra very clear

05:00

Checks OK

Now have several thousand counts total. Target level in high e12 level.

07:00

Full checks! Target level 1-6E12 [1/cm2]

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10:00

The x server on the CARME-gsi computer appears to be struggling and is not able to be checked. Needs a reboot.&nbsp;

We still have ssh access and are able to access the DAQ on another CRYRING machine machine via 192.168.207.143:8015. DAQ is still running. We will try to reboot the x server without disturbing the DAQ.&nbsp;

oopsie whole carme-gsi rebooted not just the x server. Restarting DAQ

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