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Nuclear hyperfine mixing in 229Th89+  Not logged in

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Message ID: 215     Entry time: Tue Apr 12 04:43:29 2022 Author: Alexandre, Kristian, Sebastian  Category: Runs  Subject: 322.01 - 321.60 nm

We scan the wavelength scan range is 322.01 - 321.60 nm before the first scan of the new wavelength range we changed the high voltage divider ratio in Labview from 248514 to 248517, which is the correct value for this voltage. This leads to slightly higher cooler voltages in the log. Time SIS-intensity cooler-HV LMD-DAQ2 file nr LMD-DAQ1 file nr scan range(nm) step width(nm) dwell time(s) particles counted comments 04:40 1.9e9 209625 0203 7938 322.01 - 321.60 0.002 5s 8830 05:20 1.7e9 209626 0204 7939 322.01 - 321.60 0.002 5s 7800 06:00 1.6e9 209626 0205 7940 322.01 - 321.60 0.002 5s 8500 06:45 1.7e9 209620 0206 7941 322.01 - 321.60 0.002 5s 9400 cooler HV decreased slowly by a few V, jumped back at ~7:03 07:25 1.8e9 209620 0207 7942 322.01 - 321.60 0.002 5s 9300 08:05 1.75e9 209620 0208 7943 322.01 - 321.60 0.002 5s 9100 08:45 1.7e9 209618 0209 7944 322.01 - 321.60 0.002 5s 9000 cooler HV decreased 5V to 209614 and jumped back to initial value after ~5s 09:25 1.7e9 209618 0210 7945 322.01 - 321.60 0.002 5s 8500 10:05 1.9e9 209618 0211 7946 322.01 - 321.60 0.002 5s 9200 cooler HV decreased steadily to 209611 V during the run 10:45 1.9e9 209611 0212 7947 322.01 - 321.60 0.002 5s 7500 After injecting into the ESR, we saw after cooling some tails left and right of the Shottky peak of Th. Was not there in the runs before. After some minutes it disappeared in the spectrum 11:35 2e9 209611 0213 7948 322.01 - 321.60 0.002 5s it seems to be that much lesser ions are stored in the ESR - counter shows low rate - ABORTED laser didn't start scanning 11:58 1.75e9 209615 0214 7949 322.01 - 321.60 0.002 5s 7700 cooler HV jumped to 209610 at 12:12 and stayed there 12:53 1.85e9 209611 0215 7950 322.01 - 321.60 0.002 5s 7155 cooler HV increased slowly from initial value to ~209618 13:32 1.9e9 209612 0216 7951 322.01 - 321.60 0.002 5s 6638 14:39 1.8e9 209610 0217 7952 322.01 - 321.60 0.002 5s 6815 Voltage was jumping around from 209610 up to 209624 and back 15:20 1.75e9 209612 0218 7953 322.01 - 321.60 0.002 5s 8400 In contrast to the previous measurement, the cooler voltage was drifting by about 3V around 209612 16:00 1.7e9 209612 0219 7954 322.01 - 321.60 0.002 5s 7920 16:58 1.5e9 209612 0220 7955 322.01 - 321.60 0.002 5s 4577 PMT North voltage and threshold modified Entry 221, Ecooler voltage dcreased to 209609 V, weak injection 18:09 1.62e9 209609 0221 7957 322.01 - 321.60 0.002 5s During the last injection the beam suddenly got lost during the scraping, File 7956 was discarded since go4 was still during the startup of mbs 18:49 1.69e9 209609 0222 7958 322.01 - 321.60 0.002 5s 6133 19:49 1.6e9 209610 0223 7959 322.01 - 321.60 0.002 5s 7035 20:29 1.78e9 209611 0224 7960 322.01 - 321.60 0.002 5s 4490 21:12 1.86e9 209622 0225 7961 322.01 - 321.60 0.002 5s 10296 Note that the cooler voltage is increased. Particle number might be overestimated since it was read when the beam was already dumped.

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