ID |
Date |
Author |
Category |
Subject |
62
|
Thu May 12 15:21:23 2022 |
Sebastian, Simon | Laser | Flash lamps changed |
We (Sebastian and I) changed the flash lamps of the Quanta Ray Laser and measured the output energy of the laser system afterwards (still during warm up).
All values in [mJ] and over 500 laser-pulses average
Date | Out of Quanta Ray @ 532 nm | Seed energy for Cobra @ 532 nm | Out of Cobra @ 601 nm
|
10.05.2022 | 533 | 485 | 71
|
11.05.2022 | 484 | 480 | 67
|
12.05.2022 | 578 | 501 | 75
|
The lambda/2 is at 103°. Correction factor for the 532nm-monitor is 11.4 (exchanged broken monitor). |
63
|
Thu May 12 15:34:47 2022 |
Max, Kristian, Sebastian | DAQ | laser scan, laser step and laser busy checked |
We checked all three signals in the Messhütte. Laser scan and laser step are OK.
The Laser busy signal is for large increments (0.1nm) also fine. For short increments like our usual 0.005nm increment the signal is irregularly.
Likely the laser busy status is too short. |
64
|
Thu May 12 15:50:33 2022 |
Max | Accelerator | No ESR beam |
Since 13:30 we have no beam in the ESR. There is a problem with the ESR septum.
The magnets department is investigating. |
65
|
Thu May 12 16:35:17 2022 |
Max, Wilfried, Zoran | Accelerator | NO 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. |
66
|
Fri May 13 08:32:41 2022 |
Zoran | Accelerator | NO 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"). |
67
|
Fri May 13 11:46:51 2022 |
Sebastian, Simon | | Laser energy |
We (Sebastian and I) measured the output energy of the laser system again.
All values in [mJ] and over 500 laser-pulses average
Date | Out of Quanta Ray @ 532 nm | Seed energy for Cobra @ 532 nm | Out of Cobra @ 601 nm
|
10.05.2022 | 533 | 485 | 71
|
11.05.2022 | 484 | 480 | 67
|
12.05.2022 | 578 | 501 | 75
|
13.05.2022 | 632 | 498 | 78
|
The lambda/2 is at 100°. Correction factor for the 532nm-monitor is 8.4. |
68
|
Fri May 13 16:55:58 2022 |
Danyal, Carsten, Phillip, Wilfried | General | End of E128 Beamtime |
Dear all,
unfortunately, the E128 experiment must now come to an early end.
The problem(s) with the injection septum are severe and no work around solution (with acceptable risks) could be found.
Several things were tried, but without hope.
Many thanks to everybody involved during the preparation time and the shifts during the beamtime.
Best wishes,
Wilfried |
69
|
Mon May 16 14:20:05 2022 |
Ragan, Danyal, Carsten, Phillip, Wilfried et al. | General | E128 Beamtime |
> Dear all,
>
> unfortunately, the E128 experiment must now come to an early end.
> The problem(s) with the injection septum are severe and no work around solution (with acceptable risks) could be found.
> Several things were tried, but without hope.
>
> Many thanks to everybody involved during the preparation time and the shifts during the beamtime.
>
> Best wishes,
>
> Wilfried
There is beam again in the ESR. The plan is to take beam until tomorrow morning. |
70
|
Mon May 16 15:57:37 2022 |
Rodolfo | Laser | Wavemeter calibration |
I have calibrated our Wavemeter WS7 using the temperature stabilized He-Ne Laser (SIOS EN60 825-1:2014). In the screenshots below you can see the readout of the wavemeter before (vor) and after (nach) calibration. |
Attachment 1: WS7_VorKalibrationMitHe-Ne_16-05-2022.PNG
|
|
Attachment 2: WS7_NachKalibrationMitHe-Ne_16-05-2022.PNG
|
|
71
|
Mon May 16 17:15:56 2022 |
Carsten | Analysis | DAQ /Analysis - shift of peaks in the accumulated spectra, changes in code |
After a phone call with Wilfried I implemented an offset to all hit channels of the stacked / accumulated spectra where one chekcs the timing peaks.
Therfore, I made a copy of the analysis in 208Bi1 (one "1" at the end). And here, in the file TLdaAnlProc.cxx I added an offset of +70 to the hit channel (variable UInt_t hit, around line 335 /336 of the code).
Pleasse note that I just inlcuded one line with a "magic" number here, since I cannnot test teh compiling and was afraid to introduce an error.
So the lines were
UInt_t hit =tdcSE[i][j];
changed to
UInt_t hit =tdcSE[i][j];
hit = hit + 70;
Plesaede note that you need to recompile and check and set all conditions for the time-preak window.
So , you now use the analysis in 208Bi1 |
72
|
Mon May 16 17:38:38 2022 |
Max, Danyal, Wilfried, Rodolfo | General | laser bunch timing |
We overlapped the laser and ion bunch in the time domain.
Therefore we delayed the bunching HF in order to see the PMT signal between bin 10 and 22. Before the signal Peak was in channel ~145-5 and difficult to gate on.
Afterwards we also have to shift the laser.
The new values are:
PD NO: 77.5
PD SO: 113
Ion bunch: 16.5 |
Attachment 1: timing1605.png
|
|
73
|
Mon May 16 18:01:23 2022 |
mbsMax, Danyal, Wilfried, Rodolfo, Patrick, Kristian, David, Ruijiu | Runs | runs 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
|
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 |
| Since |
74
|
Mon May 16 19:20:55 2022 |
Max, Wilfried | Analysis | start go4 before laser scan |
It is necessary to start go4 before you start the laser scan. Otherwise you get an offset in the laser Step plots. |
75
|
Mon May 16 21:08:48 2022 |
Rodolfo & Max | Laser | Laser power |
We checked the energy of the laser and optimized it a bit
Time | Seed energy for Cobra @ 532 nm | Out of Cobra @ 601 nm
|
20:41 | 415 | 63
|
20:48 | 506 | 73
|
The lambda/2 is now at 108°. |
76
|
Mon May 16 22:19:54 2022 |
Patrick | DAQ | Keep go4 running (in theory), MBS |
To accumulate more data into the opened go4, do not restart MBS, but just
sto ac
clo fi
open file lxg1297:/data.local2/208Bi/208Bi -auto -rfio
sta ac
Note: This does not work, because go4 somehow accumulates ~5 extra laser steps when starting a new scan which results in an x-axis-offset between the runs. |
77
|
Mon May 16 22:57:40 2022 |
Patrick, Kristian, David, Ruijiu | Detectors | Switched off nitrogen |
Background counts with nitrogen and air.
Less multiphoton events with air (see pictures, histogram extended to 30 with nitrogen).
Read in 4_Lasersteps/Counts
nitrogen:
XUV: 15e4
Middle: 8e4
North: 9e4
air:
XUV: 13e4
Middle: 1.2e4
North: 0.7e4 |
Attachment 1: 2022-05-16_PMTs_after_nitrogen_off.png
|
|
78
|
Tue May 17 00:44:01 2022 |
Patrick, Kristian | DAQ | Changed PMT North CFD channel |
In run 8134 - 8135 PMT North showed a super high background rate. After the scan we checked the signal cables.
Incoming signal was still good until CFD. We changed channel from 2 to 12. New threshold is 36, was 10. |
79
|
Tue May 17 06:37:28 2022 |
YL, KM | Accelerator | Reduced 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). |
80
|
Tue May 17 10:38:44 2022 |
Konstantin | Detectors | PMT North changed |
PMT located at the northern window was again replaced by the narrow-band PMT (ET Enterprise type 9423 SB, SN: 650). |
81
|
Fri May 27 10:39:53 2022 |
Kristian | DAQ | PMT North noise |
During the last run, PMT North showed some weird noise.
The PMT was replaced by the deep UV PMT with small aceptance range (100-200nm) but there was still a lot of noise on the output channel in the Messhütte, see attached photo. The intensity of the noise signal was as strong as a normal signal count.
I replaced all cables and used other preamplifier channels. The noise is gone and the baseline is flat now. However, the timing of PMT north will be a bit different now, so we should use PMT middle for the laser/ion overlap as we did before.
Graziano opened the valves for the laser and turned off the vacuum gauges and emergency lights. The background of the UV PMT looks normal (Middle 10 Hz, North 1 Hz) so I think we are fine here. |
Attachment 1: IMG_20220527_095501.jpg
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