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E121 E127 E132 E125 E143 laser_cooling_2021 E142 Ê128 E146 E0052 E0018

Nuclear hyperfine mixing in 229Th89+  Not logged in

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Message ID: 185     Entry time: Sat Apr 9 15:47:21 2022 Author: Carsten, Rodolfo, Sarper, Patrick  Category: Runs  Subject: Afternoon and night shift runs

After the morning shift, we got new increment (nm) for the laser scanning. We are now scanning 2 nm of wavelength range in 5 big steps (5 x 0.4 nm). Started with 323.2 nm - 322.8 nm range. Every big step (0.4 nm) is scanned with 0.002 nm of wavelength increment. Every scan takes ~ 18 min (0.4 nm range with 0.002 nm steps), we have scanned 2 loops. Total scanning time ~36 min. DAQ1: lxg1927:/data.local2/BeamTimeTh22/ DAQ2: lxg0155:/data.local2/E142/ LMD file name DAQ1:229Thor LMD file name DAQ2:229Th Schottky marker pos: 243.973MHz Time SIS-intensity cooler-HV LMD-DAQ1 start-end LMD-DAQ2 start-end scan range(nm) step width(nm) dwell time(s) comments xx:xx x.xe9 209xxx 0xxx 78xx 32x.x - 32x.x 0.002 x sketch for filling the table 15:14 1.5e9 209624 0111-0111 7847-7847 323.2 - 322.8 0.002 5s DAQ 2 no VUPROM TDC Pat south xx:xx 1.5e9 209624 0111-0111 7847-7847 323.2 - 322.8 0.002 5s DAQ 2 changed TDC part south from ch 8 to ch 10 17:05 2.2e9 209624 0113-0113 7848-7848 323.2 - 322.8 0.002 5s successful scan 19:04 1.8e9 209616 0116-0116 7850-7850 323.2 - 322.8 0.002 5s Intensity optimization, see below, DAQ 2 TDC part south back to channel 8 - ok, XUV detector and Cu mirror moved correctly, lost the laser beam after the half of the second loop 19:49 1.8e9 209614 0117-0117 7851-7851 323.2 - 322.8 0.002 5s successful scan 20:28 2.0e9 209622 0118-0118 7852-7852 323.2 - 322.8 0.002 5s successful scan 21:07 2.2e9 209623 0119-119 7853-7853 323.2 - 322.8 0.002 5s successful scan 22:01 1.8e9 209621 0122-0122 7856-7856 323.2 - 322.8 0.002 5s successful scan 22:41 ? 209620 0123 7857 323.2 - 322.8 0.002 5s First scan started by night shift 23:21 1.1e9 209620 0124 7858 323.2 - 322.8 0.002 5s mbs crashed at 'sta ac' 23:32 1.3e9 209618 0125 7859 323.2 - 322.8 0.002 5s e-cooler turned off 23:50 1.5e9 209xxx 0126 7860 323.2 - 322.8 0.002 5s the stop point was not set 23:53 1.5e9 209611 0127 7861 323.2 - 322.8 0.002 5s DAQ2 must have crashed between 23:30 - 23:50 00:07 1.9e9 209xxx 0128 7862 323.2 - 322.8 0.002 5s mbs crashed at 'sta ac' 00:23 1.7e9 209623 0131 7864 323.2 - 322.8 0.002 5s successful scan. we 'resl' after every measurement from now on. 'open file' is included in '@startup' now (ID:190). 01:08 1.6e9 209623 0132 7865 323.2 - 322.8 0.002 5s successful scan 01:47 1.6e9 209623 0133 7866 323.2 - 322.8 0.002 5s successful scan 02:35 1.3e9 209623 0134 7868 323.2 - 322.8 0.002 5s successful scan 03:19 2.0e9 209622 0135 7869 323.2 - 322.8 0.002 5s successful scan 04:04 1.3e9 209622 0136 7870 323.2 - 322.8 0.002 5s successful scan 04:44 1.0e9 209622 0137 7871 323.2 - 322.8 0.002 5s e-cooler turned off 05:25 1.9e9 209622 0140 7875 323.2 - 322.8 0.002 5s successful scan. DAQ1 was started ~7s before DAQ2. The files between the last measurement an this one are essentially empty. Carsten (19:00h): I notized that a lot of beam gets lost when starting scraping. I called Sergey Litvinov to help me to introduce some additional cooling/waiting (10s) after the ramp and before scraping and bunching. It increased the number of ions available for the measurement roughly by a factor of 3-5. Some runs have wrong WM data. Set Wavelength is good. Following files are saved differently, the command missed the 229Th in the end (/data.local2/BeamTimeTh22/229Thor -auto -rfio) 7850 (19:32) 7855 (21:56) 7856 (22:30)

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