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| Nuclear hyperfine mixing in 229Th89+ 2025 |
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Message ID: 68
Entry time: Fri Jun 27 14:23:39 2025
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| Author: |
Nils, Wilfried, Carsten, Julian |
| Category: |
Runs |
| Subject: |
Runs afternoon shift 27.06. |
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15:30 We have a break due to an issue at UNILAC (quadrupole failed). Also radiation safety interlock was triggered at the fragment separator. This also pushed a faradaycup into the ESR (GE01DC3VP).
Just before the issue during the last bunching, the peak was misaligned to the marker in the Schottky. The marker was sitting on the right flank. So the electron-cooled 229Th did not match with the bunching frequency anymore. We are preparing to adjust the cooler voltage to fix this. For some reason the frequency recovered and is back to its original position. However, our accumulations do not seem to work as well as before, we stagnate much earlier and at a much lower level.
15:50 Beam is back, Carsten is still investigating the drop in intensity we saw before the UNILAC failure.
17:15 TE slits were on -8 and +8, opening to -11 and +11, no change to acquisition pattern, something is still wrong
18:00 We were locked out by HHT people for 30+ mins
18:27 We had to call in ESR support
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Time | Part. Det. Int | SIS-intensity | accumulations in ESR | cooler-HV PTB K250 | cooler-HV PTB red | cooler-HV orange | LMD-DAQ1 Files | LMD-DAQ2 Files | scan range(nm) | number of positions | dwell time (laser shots) | n loops | checked laser position | mesytec rate ok | comments
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14:24 | 15800 | 2.74 e9 | 30 | 104524 | 104527 | 104528 | 196 | 224 | 551.91 - 549.41 | 501 | 15 | 1 | yes | yes |
| Carsten optimizing beam at HKR with ESR colleagues
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14:24 | 6800 | 1.16 e9 | 30 | 104524 | 104527 | 104528 | 197 | 225 | 551.91 - 549.41 | 501 | 15 | 1 | yes | yes |
| Carsten is back in measurement hut
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16:30 | 1100 | 1.1 e9 | 40 | 104524 | 104527 | 104528 | 198 | 226 | 551.91 - 549.41 | 501 | 15 | 1 | yes | yes |
| Searching for reason for small particle number
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17:00 | 1200 | 0.5 e9 | 30 | 104524 | 104527 | 104528 | 199 | 227 | 551.91 - 549.41 | 501 | 15 | 1 | yes | yes |
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19:57 | 7800 | 1e9 | 30 | 104524 | 104527 | 104528 | 200 | 228 | 551.91 - 549.41 | 501 | 15 | 1 | yes | yes |
| Restarting some things at ESR
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20:16 | 6800 | 1.5e9 | 30 | 104524 | 104527 | 104528 | 201 | 229 | 551.91 - 549.41 | 501 | 15 | 1 | yes | yes |
| Restarting some things at ESR
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20:41 | 7200 | 1.5e9 | 30 | 104524 | 104527 | 104528 | 202 | 230 | 551.91 - 549.41 | 501 | 15 | 1 | yes | yes |
| Restarting some things at ESR
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21:28 | 6000 | 2.65e9 | 30 | 104524 | 104527 | 104528 | 203 | 231 | 551.91 - 549.41 | 501 | 15 | 1 | yes | yes |
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21:47 | 6600 | 2.7e9 | 30 | 104524 | 104527 | 104528 | 204 | 232 | 551.91 - 549.41 | 501 | 15 | 1 | yes | yes |
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22:08 | 17000 | 2.5e9 | 30 | 104524 | 104527 | 104528 | 205 | 233 | 551.91 - 549.41 | 501 | 15 | 1 | yes | yes | TE slits -7 +7
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