HOME ESR EXPERIMENTS LABS etc
E121 E127 E132 E125 E143 laser_cooling_2021 E142 Ê128 E146 E0052 E0018 E0028 E0038
  Nuclear hyperfine mixing in 229Th89+, Page 1 of 12  Not logged in ELOG logo
 Find |  Login |  Help 
 Full | Summary | Threaded | Collapse | Expand  Show only new entries    228 Entries 
Goto page 1, 2, 3 ... 10, 11, 12   Next  All
Entry  Wed Mar 25 08:24:10 133, Ken Ueberholz, Detectors, XUV-Detector Rates Screenshot_20220404-000343_Gallery.jpgScreenshot_20220404-000327_Gallery.jpgScreenshot_20220404-000411_Gallery.jpg 
Count rates were measured for the XUV-
detector for a full circle:
Cathode: -5V, shields: 0V, main coil 8A, 
sec coil 2A, 
No beam - pos 0mm: ~10 Hz
Hot beam - pos 0mm: ~5 kHZ
Cool beam - pos 147mm: ~200Hz
Entry  Wed Apr 20 10:09:50 2022, Rodolfo, Laser, Optic with spots SHG_Compensator_mitFleck_19-04-2022.jpgUV_Umlenkspiegel_mitFleck_19-04-2022.jpg
The average energy produced by the laser along the beamtime was about 10 mJ/puls. After about two weeks of beamtime some of the optics, especially the optic placed just after the BBO crystall, got some spots, see pictures below. Here the diameter of the laser beam is about 6 mm.
Entry  Sat Apr 16 04:19:05 2022, Patrick, Simon, Alex, Sarper, Runs, Runs night + morning shifts 16.04. 
Runs of the night shift 16.04. after changing the wavelength range. The new range is 320.12 - 319.859 nm. The step size was decreased from 0.002 nm to 0.001 nm.
The goal was to have the same number of scans as before (261), however, the scan range in the labview program could not be set accordingly. We decided to go with 262 scans after the first run.


TimeSIS-intensitycooler-HVLMD-DAQ2 file nr LMD-DAQ1 file nr scan range(nm)step width(nm)dwell time(s)particles countedcomments
04:24 1.28e9 209616 0338 8051 320.12 - 319.86 0.001 5s 6750 This run had only 260 scans
05:18 1.20e9 209615 0339 8052 320.12 - 319.859 0.001 5s 6300 First run with 262 scans
06:09 1.36e9 209615 0340 8053 320.12 - 319.859 0.001 5s 6910 laser scan started 2 min late at 650 counts
07:03 1.24e9 209615 0341 8054 320.12 - 319.859 0.001 5s 6330
07:59 1.23e9 209615 0342 8055 320.12 - 319.859 0.001 5s 5712
08:51 1.1e9 209615 0343 8056 320.12 - 319.859 0.001 5s 4380
09:44 1.28e9 209615 0344 8057 320.12 - 319.859 0.001 5s 5135
10:39 1.25e9 209615 0345 8058 320.12 - 319.859 0.001 5s 5860
11:30 1.2e9 209615 0346 8059 320.12 - 319.859 0.001 5s 6500
12:22 1.23e9 209618 0347 8060 322.41 - 322.00 0.002 5s 5200 Laser wavelength scan range is changed to 322.41 - 322.00 nm and increment to 0.002 nm.
13:04 1.2e9 209616 0348 8061 322.41 - 322.00 0.002 5s 4411
13:50 1.2e9 209616 0349-0351 8062-8063 322.41 - 322.00 0.002 5s 10651 last scan / 10 loops ~ 3 hours of scan -- Ecooler failed, realized at 16:05 we were on loop8, laser is turned off at 16:10
Entry  Fri Apr 15 20:43:18 2022, Konstantin, Laser, Dye changed  
Dye of the laser system has been changed. UV laser power increased from ~8 mJ to 11 mJ pulse energy.
Entry  Fri Apr 15 12:53:25 2022, Max, Danyal, Laser, checked laser pulse energy after change in wavelength range 
previous scan range:
the laser pulse energy @ 320.62 nm was ~11 mJ

new scan range:
the laser pulse energy @ 320.12 nm was ~11 mJ
the laser pulse energy @ 319.60 nm was ~10 mJ
Entry  Fri Apr 15 12:42:18 2022, Max, Danyal, Carsten, Konstantin, Patrick, Simon, General, laser wavelength range changed: 320.12 - 319.60 nm VoltageJump1830.PNG

Runs of the morning/afternoon/night shift. The wavelength range is now 320.12 - 319.60 nm.

TimeSIS-intensitycooler-HVLMD-DAQ2 file nr LMD-DAQ1 file nr scan range(nm)step width(nm)dwell time(s)particles countedcomments
12:51 1.2e9 209617 0321 8034 320.12 - 319.60 0.002 5s 5530 ERS Trafo 1.25e7 --> 1.2e9
13:43 1.2e9 209617 0322 8035 320.12 - 319.60 0.002 5s 6408 at 13:49 there was a short broadening of the ion beam in the Schottky spectrum
14:35 1.16e9 209618 0323 8036 320.12 - 319.60 0.002 5s 6585
15:30 1.08e9 209617 0324 8037 320.12 - 319.60 0.002 5s 5701
16:20 1.10e9 209617 0325 8038 320.12 - 319.60 0.002 5s 5470
17:11 1.11e9 209617 0326 8039 320.12 - 319.60 0.002 5s 5519
18:00 1.08e9 209616 0327 8040 320.12 - 319.60 0.002 5s 5402 Ecooler voltage suddenly jumped to 109619 around 18:30. Laser spot seems to drift slowly to an inner position (left on the screen). This might be due to an interplay between a decreasing laser power and the position sensitive detectors of the beam stabilization.
18:52 1.16e9 209620 0328 8041 320.12 - 319.60 0.002 5s 6948
20:39 1.13e9 209619 0329 8042 320.12 - 319.60 0.002 5s 6xxx Dye was changed before this run was started
20:32 1.20e9 209620 0330 8043 320.12 - 319.60 0.002 5s 6948
22:25 1.21e9 209619 0331 8044 320.12 - 319.60 0.002 5s 7120 Night shift took over (Patrick, Simon)
23:15 1.26e9 209619 0332 8045 320.12 - 319.60 0.002 5s 7080
00:06 1.25e9 209616 0333 8046 320.12 - 319.60 0.002 5s 6500
00:59 1.23e9 209616 0334 8047 320.12 - 319.60 0.002 5s 5380
01:50 1.30e9 209616 0335 8048 320.12 - 319.60 0.002 5s 6750
02:41 1.38e9 209616 0336 8049 320.12 - 319.60 0.002 5s 6970
03:32 1.37e9 209616 0337 8050 320.12 - 319.60 0.002 5s 7010
Entry  Thu Apr 14 22:44:40 2022, Patrick, Simon, Danyal, Max, Runs, Runs night shift 14./15.04. 
Runs of the night shift. The wavelength range is 320.62 - 320.10 nm.

TimeSIS-intensitycooler-HVLMD-DAQ2 file nr LMD-DAQ1 file nr scan range(nm)step width(nm)dwell time(s)particles countedcomments
22:38 9.5e8 209621 0305 8018 320.62 - 320.10 0.002 5s 5000 laser scan was started 1 min late
23:38 9.8e8 209622 0306 8019 320.62 - 320.10 0.002 5s 5550
00:32 1.0e9 209621 0307 8020 320.62 - 320.10 0.002 5s 4000 After ~4000 counted particles (second scan, 1:04 am) the e-cooler went off.
01:21 1.1e9 209622 0308 8021 320.62 - 320.10 0.002 5s 6700
02:12 1.2e9 209623 0309 8022 320.62 - 320.10 0.002 5s 6400
03:03 1.1e9 209624 0310 8023 320.62 - 320.10 0.002 5s 5500
03:55 1.3e9 209622 0311 8024 320.62 - 320.10 0.002 5s 7700
04:47 1.2e9 209622 0312 8025 320.62 - 320.10 0.002 5s 5300
05:36 1.2e9 209620 0313 8026 320.62 - 320.10 0.002 5s 6666
06:25 1.2e9 209619 0314 8027 320.62 - 320.10 0.002 5s 6500 change of shift crew (Danyal & Max)
07:16 1.2e9 209618 0315 8028 320.62 - 320.10 0.002 5s 5230
08:13 1.2e9 209620 0316 8029 320.62 - 320.10 0.002 5s 6600
09:04 1.1e9 209619 0317 8030 320.62 - 320.10 0.002 5s 6660
09:54 1.2e9 209619 0318 8031 320.62 - 320.10 0.002 5s 5950
10:49 1.1e9 209619 0319 8032 320.62 - 320.10 0.002 5s 6580
11:38 1.1e9 209617 0320 8033 320.62 - 320.10 0.002 5s 5380
Entry  Thu Apr 14 19:46:46 2022, Sarper & Konstantin & Rodolfo, Laser, Laser power 
We checked the laser power before starting the new scan range.

- Seed energy before Cobra @ 532 nm: 513 mJ (before 499 mJ).
- New correction factor for Monitor: 71.25.
- UV output energy after SHG @ 320.1 nm: 11 mJ

All values are averaged over 500 laser pulses.
Entry  Thu Apr 14 17:47:55 2022, Carsten, Rodolfo, Konstantin, Sarper, Runs, Afternoon shift runs 14.04 changing the wavelength scan range 
The new scan range is changed from 321.12 - 320.60 nm to 320.62 - 320.10 nm

TimeSIS-intensitycooler-HVLMD-DAQ2 file nr LMD-DAQ1 file nr scan range(nm)step width(nm)dwell time(s)particles countedcomments
18:36 9.5e8 209618 0301 8014 320.62 - 320.10 0.002 5s 6270
19:45 9.4e8 209615 0302 8015 320.62 - 320.10 0.002 5s 5400
20:44 8.4e8 209618 0303 8016 320.62 - 320.10 0.002 5s 4210
21:37 8.9e8 209616 0304 8017 320.62 - 320.10 0.002 5s 4550
Entry  Thu Apr 14 12:38:38 2022, Sebastian, Detectors, XUV / Cu checkups  
Check regularly if the connection to the XUV and Cu detectors are still active and the detectors move in (after injection) and out (after killing the ion beam). 

Therefore, 2 programs should run on the computer where you can also see the running Schottky.

One of the programs is for the XUV and one is for the Cu mirror.
There the Automisation button should be activated!!!

ID 30 contains the manual how to run / start and operate both detectors.
Entry  Thu Apr 14 12:27:18 2022, Sebastian, Max, Detectors, Connection to XUV / Cu reestablished!  
The connection to the XUV and Cu were lost during the nightshift.

The XUV detector was in the park position,
BUT the Cu mirror was in the "Measurement position" (moved in / active).

This could be one of the main problems that we had much lesser ion beam intensity since the UNILAC and SIS18 failures last night.
Entry  Thu Apr 14 10:57:11 2022, Carsten, Accelerator, Maintanence UNILAC / Op training 
We had no beam since about 1000. Also, we are still trying to find out why we have such a low intensity in the expereimnt.
Presently, there is a planned maintenance in the UNILAC, beam is expected back in 25-30 mins.
The profile grid TE3 in the transfer beamline in front of the target will be used to check if the extracted SIS beam has changed compared to before the crash of the SIS.
All devices in the ESR seem to work normally including ramping of cooler current/voltage, dipole correction windings and sextupoles (all checked).
As we observed that coolng performace after injection is much worse Markus (Steck) suggested that we could try a longer manual cooling in machine 3 (pleae no cahnges in timimng) to see whether the SIS energy has changed (similar to about 1 week ago).
Cooler elctron current iis put back to 450ma (inejection / 40mA measurement).
Entry  Thu Apr 14 08:41:42 2022, Carsten, Accelerator, Low intensity at the experiment after series of failures during the night  
After the recovery from the failures during the night, we see much lower intensity at the experiment (measured with the particle detector count rate).
Instead of 8000-10000 cts we see only 3000-4000cts at comparable SIS intensities.
Also ESR cooler seems to be slightly unstable (wiggling lines) during injection. However, it is visually evident from the Schottky that the injected intensity already is much lower than yesterday evening.

All devices in ESR are (seem to run ) runnng properly, and also slit position (PN devices) are ok.

I am going to open the slits iin the SIS ESR transfer beamline. It would be useful to check for the SIS-ESR timing.
Entry  Thu Apr 14 06:29:18 2022, Max, Sebastian, Accelerator, lesser ESR injection intensity 2022_04_14-lowCountRate-LesserESRInjection-SchottkyIntensity.JPG 
We now have less ESR injection intensity (see screenshot attached).

This can also be seen in the count rate after "UNILAC/SIS failures".
Before failure: ~7k-8k
Now: 3k

The stored particles in the SIS are only in the range between 1.4 and 1.7e9
Entry  Wed Apr 13 15:41:29 2022, Rodolfo & Sarper, Laser, Laser status 
We have checked the power of the laser and optimized it "a bit".

- Seed energy for the Cobra @ 532 nm: 508 mJ (before 496 mJ)*
- New correction factor for the Monitor: 43.
- UV energy after the SHG @ 321.1 nm: 11.6 mJ*



*Average over 500 pulses.
Entry  Wed Apr 13 14:29:04 2022, Carsten, Rodolfo, Sarper, David, Pierre-Michel, Max, Sebastian, Runs, Afternoon - morning shift runs 13.+14.04. coolerProblemsAndFragments.JPGfragments.JPGBroaderIonBeam.JPGagainNormalWidth.JPG
Changed the wavelength scan range from 321.62 - 321.10 nm to 321.12 - 320.60 nm after one scan.

TimeSIS-intensitycooler-HVLMD-DAQ2 file nr LMD-DAQ1 file nr scan range(nm)step width(nm)dwell time(s)particles countedcomments
14:28 1.9e9 209618 0254 7983 321.62 - 321.10 0.002 5s 7950
15:35 1.7e9 209613 0255 7984 321.12 - 320.60 0.002 5s 7100 Wavelength range has changed starting from this scan
16:21 1.8e9 209612 0256 7985 321.12 - 320.60 0.002 5s 6900
17:11 1.8e9 209619 0257 7986 321.12 - 320.60 0.002 5s 7950
17:57 2.0e9 209618 0258-0259 7987 321.12 - 320.60 0.002 5s 8900
18:48 2.1e9 209620 0260-0261 7988 321.12 - 320.60 0.002 5s 9260 After the scan was complete, we have realized that TCL 1064 computer is crashed.. fixed @ 20:05
20:07 2.1e9 209621 0262 7989 321.12 - 320.60 0.002 5s 7800
20:56 2.0e9 209620 0263 7990 321.12 - 320.60 0.002 5s 8190 After closing file, we replaced the dye from the laser.
22:10 0 209620 0264 7991 321.12 - 320.60 0.002 5s 0 No beam due to failures in Unilac and SIS. NTCAP stopped 01:44, restarted 02:15
02:20 1.5e9 209620 0265 7992 321.12 - 320.60 0.002 5s 0 Electron cooler problem during scan, bad file.
02:52 1.4e9 209624 0266-0267 7993 321.12 - 320.60 0.002 5s 3076 --> CU mirror in all time !!!
03:44 1.6e9 209625 0268-0269 7994 321.12 - 320.60 0.002 5s 5156 --> CU mirror in all time !!!
04:35 1.7e9 209624 0270-0271 7995 321.12 - 320.60 0.002 5s 3430 --> CU mirror in all time !!!
05:27 1.6e9 209621 0272-0273 7996 321.12 - 320.60 0.002 5s 3200 --> CU mirror in all time !!!
06:17 1.6e9 209621 0274-0275 7997 321.12 - 320.60 0.002 5s 3371 low particle count since 22:00, see ID:225, --> CU mirror in all time !!!
07:24 1.5e9 209622 0276-0277 7998 321.12 - 320.60 0.002 5s 3366 --> CU mirror in all time !!!
08:33 1.6e9 209621 0278-0279 7999 321.12 - 320.60 0.002 5s 2940 ecooler jumped to 209615 during measurement, --> CU mirror in all time !!!
09:26 1.5e9 209618 0280 8000 321.12 - 320.60 0.002 5s aborted, request of Carsten
09:46 1.6e9 209621 0283-285 8003 321.12 - 320.60 0.002 5s 2950 small ecooler current changes (300mA injection and 50mA @ measurement), fragments survive in schottky @ lower frequencies (see attached pic1 and pic2), it seems to be that the cooler does not work correctly in "phase 1" (pic 1), --> CU mirror in all time !!!
11:28 1.75e9 209624 0287 8005 321.12 - 320.60 0.002 5s ~1800 ESR cooler back to 450mA (injection), 40mA (measurement), additional manual waiting time of 15s in machine 3 (after injection before ramping); ABORT laserscan on Carstens request after ~1 loop; Sergey arrived and we get some time for ion beam adjustements, --> CU mirror in all time !!!
12:23 1.5e9 209623 0289-0290 8007 321.12 - 320.60 0.002 5s 8100 Cu mirror is again automated and intensity in ESR is back up ; @12:42 increase of the width of the ion beam (pic3) @12:43 again normal width, intensity dropped significantly over time afterwards
13:09 1.55e9 209622 0291-292 8008 321.12 - 320.60 0.002 5s 4852 beam killed @ loop 2 scan nbr 253 (8 steps missed)
14:00 1e9 209622 0293-0294 8009 321.12 - 320.60 0.002 5s 5509
14:48 9.5e8 209622 0295-0296 8010 321.12 - 320.60 0.002 5s 5477
15:47 1e9 209622 0297-298 8011 321.12 - 320.60 0.002 5s 6336
16:42 7e8 209619 0299 8012 321.12 - 320.60 0.002 5s 2424
17:45 9.9e8 209620 0300 8013 321.12 - 320.60 0.002 5s 5133
Entry  Tue Apr 12 21:56:54 2022, Volker, David, Pierre-Michel & Danyal, Alexandre, Sebastian, General, new laser wavelength scan range 321.62 - 321.10 nm Ecooler12VdropOn13_04_22_9_52am.pngEcooler18VEcoolerJumpOn13_04_22_13_18pm.png
New wavelength scan range is 321.62 - 321.10 nm. Before the new scan range (compare old scan range in Entry 215) was applied,
the cooler settings were slightly modified. Current was changed from 50 mA to 40 mA, correction voltage was changed from 3943 V to 3948 V. Additionally, the positions
of scraper NA was changed from -10 mm to -8 mm and scraper NI from +10 mm to +8 mm.


TimeSIS-intensitycooler-HVLMD-DAQ2 file nr LMD-DAQ1 file nr scan range(nm)step width(nm)dwell time(s)particles countedcomments
21:57 1.55e9 209621 0226-0227 7962 321.62 - 321.10 0.002 5s 7835
22:54 1.4e9 209612 0228 7963 321.62 - 321.10 0.002 5s 3326 PMT south voltage reduced to 2400 V before run, Threshold now 80, Cooler Voltage changed to 209628 V at 23:19
23:45 2.0e9 209628 0229-0230 7964 321.62 - 321.10 0.002 5s 8560
00:34 1.7e9 209626 0231 7965 321.62 - 321.10 0.002 5s 7169
01:29 1.1e9 209624 0232 7966 321.62 - 321.10 0.002 5s 6412
02:19 1.75e9 209626 0233 7967 321.62 - 321.10 0.002 5s 7590
03:06 1.6e9 209630 0234 7968 321.62 - 321.10 0.002 5s 6329
03:58 1.7e9 209629 0235-0236 7969 321.62 - 321.10 0.002 5s 7710
04:43 1.8e9 209629 0237 7970 321.62 - 321.10 0.002 5s Electron cooler went red @04:48
05:48 1.5e9 209623 0238 7971 321.62 - 321.10 0.002 5s 9420
06:42 1.6e9 209616 0239 7972 321.62 - 321.10 0.002 5s 8250
07:32 1.7e9 209621 0240 7974 321.62 - 321.10 0.002 5s 8840 file 7943 was started accidentally too early and killed
08:22 1.85e9 209622 0241 7975 321.62 - 321.10 0.002 5s ABORTED: laser did not start scanning
08:33 1.90e9 209624 0242-243 7976 321.62 - 321.10 0.002 5s 9955
09:23 1.7e9 209624 0244-0245 7977 321.62 - 321.10 0.002 5s 9021 09:50 Ecooler 12V drop for a few seconds; 9:52 again 12V E-cooler drop
10:12 1.85e9 20962x 0246 7978 321.62 - 321.10 0.002 5s 8067
11:10 1.7e9 209615 0247-248 7979 321.62 - 321.10 0.002 5s 8905
11:59 1.94e9 209612 0249-0250 7980 321.62 - 321.10 0.002 5s 8203 drop in E-cooler voltage of 8V at about 12:16 (before there was a slow increase from .612 to .620)
12:48 2.0e9 209612 0251-0252 7981 321.62 - 321.10 0.002 5s 8018 E-cooler is not very stable (varies between .604 and .613) ; ~13:18 E-Cooler 18V jump to 209622V
13:36 1.7e9 209621 0253 7982 321.62 - 321.10 0.002 5s 8170
Entry  Tue Apr 12 17:01:30 2022, Konstantin, Detectors, Voltage PMT North 
Voltage of PMT North has been increased from 2500 V to 2600 V. Additionally the threshold was adapted from 25 mV to 12 mV.
Entry  Tue Apr 12 15:05:56 2022, Rodolfo, Laser, Laser status  
We have checked the laser power at 14:15 *

- Pump energy after Q-Ray @ 532nm: 559 mJ.
- Seed energy for Cobra @ 532 nm: 505 mJ (before 481 mJ).
- Correction factor for monitor: 28.8.
- UV-Energy after SHG @ 321.6 nm: 13.7 mJ.


* All values are averaged over 500 shots
Entry  Tue Apr 12 14:52:19 2022, Rodolfo, Detectors, PMT Nord, Middle. Datasheets ET-Enterprises_DataSheets_PMT_9423-9422.pdf
Attached are the datasheets for the solar-blind PMTs.

- PMT Nord. Type 9423. SN: 650
- PMT Middle. Type 9422. SN: 1049
Goto page 1, 2, 3 ... 10, 11, 12   Next  All
ELOG V3.1.5-fc6679b