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  Dielectronic recombination-assisted laser spectroscopy, Page 6 of 6  Not logged in ELOG logo
ID Date Authorup Category Subject
  17   Mon May 9 11:45:57 2022 Wilfried, Jon, SebastianGeneralHV Divider position & DMM calibration
We performed an autocalibration (attached picture 1) of the Keysight 34465A DMM (TUD Keysight).

The position and the "cabling" to the cooler platform was also adjusted (picture 2,3).
Attachment 1: DMM_calibration.PNG
DMM_calibration.PNG
Attachment 2: dividerPosition.PNG
dividerPosition.PNG
Attachment 3: dividerPosition1.PNG
dividerPosition1.PNG
  45   Wed May 11 18:00:40 2022 Wilfried, Phillip, MaxDetectorsdouble PD NO peak problem solved
In entry 36 one finds an additional PD NO peak around bin 100.
This was caused by signal reflection in the cable.
The problem was solved by adjusting the CFD threshold from 10 to 30.
 
  46   Wed May 11 18:13:04 2022 Wilfried, Phillip, MaxDAQlaser scan/step complete
The scaler channel laser scan complete and laser step complete is interchanged in go4. Carsten will fix this on the software side.
Additionally the laser scan complete signal was not there in the first place. After checking the signal on multiple points, the signal was suddenly back in the DAQ.
Possibly there is a bad cable/contact somewhere (on the Labjack?). The signal should be checked in go4 from time to time. 
  79   Tue May 17 06:37:28 2022 YL, KMAcceleratorReduced beam intensity
The resonance in 209Bi has been seen during the night.
Reducing the intensity by a factor~1000, to simulate 208Bi conditions
Running low intensity since ~6:15-6:20
The present intensity is so low that DCCT does not see the beam.
On Schottky the beam is clearly seen as ~30-40 dB over the background.
The real intensity is to be determined from the NTCap, which is running (checked).
  16   Mon May 9 09:43:08 2022 ZoranAcceleratorESR Beam
The main control room started setting up the Bi beam this morning, but quickly stopped in order to solve some problems around the UNILAC. Therefore we 
should not plan to receive ions earlier than late in the evening on Monday, or probably Tuesday during the day.
  24   Mon May 9 19:56:41 2022 ZoranAcceleratorstatus Monday evening
The main control room is setting up the SIS for extraction. At the moment there are 2.5E8 particles in the SIS. Later they will check the transport and the devices for the 
ESR injection. The ESR operators might (! no info available) take over later in the evening, but there will definitely be no beam for the experiment before tomorrow morning.

=> the night shift will not take place, unless some laser adjustments need to be done (so far we see no problems)
=> the morning shift does not need to come at 6AM. My guess is that before the morning briefing at 8:30 there will be no news.

The ESR cave is closed again. Talk to the main control room if you need access.
  25   Tue May 10 09:05:19 2022 ZoranAcceleratorstatus Monday evening
> The main control room is setting up the SIS for extraction. At the moment there are 2.5E8 particles in the SIS. Later they will check the transport 
and the devices for the 
> ESR injection. The ESR operators might (! no info available) take over later in the evening, but there will definitely be no beam for the experiment 
before tomorrow morning.
> 
> => the night shift will not take place, unless some laser adjustments need to be done (so far we see no problems)
> => the morning shift does not need to come at 6AM. My guess is that before the morning briefing at 8:30 there will be no news.
> 
> The ESR cave is closed again. Talk to the main control room if you need access.

Status SIS on Monday evening. ESR setting up starting on Tuesday morning. There is some prospect of getting more ions by setting up multi-multiturn 
injection, however still uncertain.
Attachment 1: 22-05-09_200006_20220509_170137_tcl1024_dcct.png
22-05-09_200006_20220509_170137_tcl1024_dcct.png
  42   Wed May 11 08:01:44 2022 ZoranRunsStart laser scanning

Quote:

Questions:
There are many other masses/isotopes/etc. visible in the Shottky spectrum. Is this wanted?
Are the vacuum gauges turned off?
Laser timing correct? +- 3 bins?


No, this is not wanted and yes, the machine is aware of the problem. The decision on Tuesday evening was to leave the ESR in that state in order to start the measurement and continue setting on Wednesday. Otherwise the night shift could not take place.

The additional isotopes are only a few percent and should contribute insignificantly to the background rate.
  47   Wed May 11 20:47:54 2022 ZoranAcceleratorbeam lost in SIS
For some reason the beam was lost in the SIS soon after taking the ESR beam this evening, reason unknown. Solved by sending teh full context to the SIS machine and having 
operators to manually set the voltage of the SIS extraction kicker. Afterwards a slight readjustment of the transfer beamline was necessary:

In the SIS: GTE5 KY1, MU0, QD21, QD22 as well as in the ESR: GE01MU4I (5 -> 6 mrad)

This brought back around 1E7 particle in the ESR after 5 accumulated SIS injections.
  66   Fri May 13 08:32:41 2022 ZoranAcceleratorNO BEAM UNTIL TOMORROW MORNING
> The problem at the ESR septum is serious. They have to remove the broken part and try to repair it.
> Maybe tomorrow in the morning briefing there will be more information about this.
>
> The night shift will not take place!
> The morning shift starts at 9:00 or on further notice!
>
> The PMTs are switched off and the laser also.

Update from the morning briefing: the DCCT (power converter) of the injection septum was demounted and the EPS group is trying to fix it. There is no replacement available, so if they do not succeed this beamtime is over. They promised more information in the midday meeting at 12:45.

In the ESR Messhüte is some cake ("Trostkuchen").
  73   Mon May 16 18:01:23 2022 mbsMax, Danyal, Wilfried, Rodolfo, Patrick, Kristian, David, Ruijiu Runsruns afternoon/night shift 16.05
These are the runs after the septum was repaired on 16.05.

Time ESR-intensity ESR-intensity after orbit change cooler-HV LMD-DAQ2 file nr LMD-DAQ1 file nr scan range(nm) step width increment (nm) dwell time(s) n loops comments
ca. 18:00 ? ~3.0e7 223222 504-505 8121 601.62 - 601.405 0.005 5s 4 DAQ2 late start
18:11 ? ~3.3e7 223222 506 8122 601.62 - 601.405 0.005 5s 4 aborted, ions are rapidly lost after Bahnverlagerung
18:33 4.5e7 ~3.7e7 223222 507-509 8123 601.62 - 601.405 0.005 5s 4 removed all scrapers, beam life time is better, high intensity, slight instability in bunching, ion intensity at the end: 1.4e7, DC Trafo was in saturation so ampl. was turned down
19:32 ? 3.7e7 223222 512 8125 601.62 - 601.405 0.005 5s 4 rf bunching amplitude decreased from 350V -> 280V
20:00 ? 3.6e7 223223 514 8127 601.745 - 601.32 0.01 5s 4 43 steps of laser, therefore 1 step offset from loop to loop, laser already of ?
20:30 ? 2.9e7 223223 520-522 8129 601.760 - 601.320 0.01 5s 6 aborted after 3 loops, laserstabi was off, probably during hole measurement
21:01 ? 3.6e7 223223 524-528 8130 601.760 - 601.320 0.01 5s 6
21:30 ? 3.4e7 223223 529-532 8131 601.760 - 601.320 0.01 5s 6 coasting beam now !!!
22:10 ? 3.7e7 223223 534-537 8132 601.760 - 601.320 0.01 5s 6 Night shift took over.
22:40 4.4e7 3.6e7 223223 539-542 8133 601.760 - 601.320 0.01 5s 6
23:52 3.8e7 3.2e7 223223 545-548 8134 - 8135 601.760 - 601.320 0.01 5s 6 Switched off the nitrogen before this run, stopped acq. after 4 loops (laser gone), PMT north saw a lot of noise? (ID:78) -> larger files.
00:39 4.3e7 3.2e7 223222 552-555 8136 601.760 - 601.320 0.01 5s 6 The secondary DAC always requires 2-3 restarts until it is working.
01:10 3.8e7 3.0e7 223222 557-558 8137 601.760 - 601.320 0.01 5s 6 Laser moved away during the third loop, acq. stopped.
01:33 4.2e7 3.1e7 223222 561-564 8139 601.760 - 601.320 0.01 5s 6 The previous laser scan was still running, restarted the acq. once.
02:00 > 4.0e7 3.4e7 223222 566-569 8140 601.760 - 601.320 0.01 5s 6
02:30 > 4.0e7 3.2e7 223222 573-576 8141 601.760 - 601.320 0.01 5s 6
02:58 4.2e7 3.4e7 223222 579-582 8142 601.760 - 601.320 0.01 5s 6
03:45 4.2e7 3.3e7 223222 585-589 8143 601.760 - 601.320 0.01 5s 6 Back to bunched beam mode
04:15 4.7e7 3.4e7 223222 594-598 8144 601.760 - 601.320 0.01 5s 6
04:43 4.4e7 3.4e7 223222 600-604 8145 601.960 - 601.520 0.01 5s 6 We changed the scan range Big grin
05:10 4.3e7 3.3e7 223221 606-610 8146 601.960 - 601.520 0.01 5s 6 It looks like the "overWavel" plots actually work better now, because the laser steps somehow are counted wrongly, leading to shifts between loops.
05:37 4.2e7 3.7e7 223221 611-615 8147 601.960 - 601.520 0.01 5s 6
06:27 ? ? 223219 616-618 8148 601.960 - 601.520 0.01 5s 6 Since Go4 was still running during startup we were not able to look into the data during the scan. After reduction of particle number, the dc trafo is no longer capable to measure to number of ions.
06:56 ? ? 223219 619-620 8149 601.960 - 601.520 0.01 5s 6
07:25 ? ? 223219 621-622 8150 601.9 - 601.7 0.01 5s 6 Changed the scan range t0 601.9-601.7 and reduced step increment to 0,005nm
07:56 ? ? 223219 623-624 8151 601.9 - 601.7 0.01 5s 6
08:20 ? ? 223219 625-625 8152 601.9 - 601.7 0.01 5s 6 Restarted scan without new injection, DAQ2 was not running during this scan
08:44 ? ? 223220 626-627 8153 601.9 - 601.7 0.01 5s 6 Reduced Loop number to 4 (aborted after 4 completed scans)
09:03 ? ? 223220 628 8154 601.9 - 601.7 0.01 5s 6 Reduced Loop number to 3 (before starting a new scan)
09:17 ? ? 223221 629 8155 601.9 - 601.7 0.01 5s 6
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