| ID |
Date |
Author |
Category |
Subject |
|
65
|
Thu Jun 13 14:35:27 2024 |
Ruijiu Chen, David | Analysis | Lifetime of beam during June 13 7:00~9:00 |
|
|
64
|
Thu Jun 13 14:20:36 2024 |
Ruijiu Chen, David | Analysis | Lifetime of beam during June 13 4:30:7:00 |
|
|
63
|
Thu Jun 13 13:29:47 2024 |
Ruijiu Chen, David | Analysis | Lifetime of beam during June 12 22:00- June 13 0:00 |
|
|
16
|
Mon Jun 3 19:42:06 2024 |
Rodolfo | Laser | Laser-beam through E-Cooler |
UV-laser beam is now going through the Electron-Cooler.
Telescope settings:
- Plan concave lens -500 mm
- Plan convex lens + 1000 mm
- Distance between the both linses: 535 mm
- Position at Long Travel Stage: 60,0 mm |
|
5
|
Wed May 29 09:49:30 2024 |
Rodolfo | Laser | Laser-beam profile |
| Using a telescope (Plan-concave lens -500 mm and Plan-convex lens +1000 mm) after the pulsed-dye laser system we got the following laser-beam profile at the Electron-Cooler's position. Dye Laser @ 550 nm / 275 nm |
|
70
|
Thu Jun 13 18:38:24 2024 |
Rodolfo Sanchez, Julian Palmes, Sebastian Klammes | Laser | Laser Dye change - new MRC settings - scraper checks of laser beam |
We changed the dye at ~3pm.
After some fine adjustements of the laser we had to change the MRC settings, because the laser position changed.
Therefore we checked the position of the laser with the T-Scrapers with the settings from post 49 "First Scraper Scan".
New settings of MRC and screen pic is attached.
The position of the laser on the screen is now the 'same' as yesterday (see attachement). |
|
41
|
Tue Jun 11 09:17:46 2024 |
Julien, Konstantin, Lukas | DAQ | Important commands (DAQ1) |
To connect to the DAQ1 pc, open a terminal and type:
ssh atplaser@r4l-41
Enter password for user atplaser (note that you're typing on an English keyboard).
To start MBS on DAQ1 go to folder mbsrun/E0052/DAQ1 via "cd mbsrun/E0052/DAQ1" and start mbs by typing "mbs". If you want to ensure that you are in the correct folder list the content of the folder by using "ls -l". You should see the list depicted in the second attachment.
Finally, to start the data acquisition (ensure that the 'medusa' is running on atppc023) use commands
@startup
sta ac
within the mbs prompt. You should see a similar result as in attachment 3. Particularly, note the important line
"-R4L-41 :read_meb :connected successfully to LabView Server. ".
A more detailed compilation of commands within mbs is given in Entry 10.
If one wants to observe the current acquisition, one must open a second terminal and establish another ssh-connection to R4l-41. The "rate" command will then show the incoming events on mbs (see attachment 4). If something went wrong you will see that the event-rate goes down. This might be an indication that the connection to medusa has crashed (see attachment 5). |
|
44
|
Tue Jun 11 22:59:06 2024 |
Carsten | Accelerator | Identification / NTCAP started |
ESR is set-up in most parts.We are trying to identify our 229Th89+. It is more cumbersome then exspected because of the thick target an d the according energy loss, the pattern has changed compared to the last beamtime.
Just started the NTCAP with center frequency 246,5 MHz, 10 MSamples/s and -25db.
Center frequency will later be changed back to about 244,5 Mhz.
Directory 06-11-22_55_15 (correct time stamp). |
|
45
|
Tue Jun 11 23:46:06 2024 |
Carsten )))) | Accelerator | ID |
----
The frequency of the primary beam 238U82+ at the injection:
Ucool = -360 V
Frev = 1.974647 MHz without bump
Frev=1.97387 MHz with bump
---
ID:
246 MHz + kHz (+/- intensity) ID
521 +++ 238/92+
565 +. 230/89+
595 +++ 235/91+
642 +. 227/88+
670 +. 232/90+
693 +++ 237/92+ (strongest line)
721 +. 224/87+
744 ++. 229/89+ (our Th line)
767 ++. 234/91+
822 +. 226/88+
845 +. 231/90+
867 +. 236/92+
901 - 223/87+
922 +. 228/89+
942 +. 233/91+
1001 +. 225/88+
1020 ++. 230/90+
1039 +. 235/92+
1100 +. 227/89+
1211 + <- far off |
|
46
|
Wed Jun 12 01:51:51 2024 |
RuiJiu, David | Analysis | ID |
The preliminary identification has been thoroughly checked using the RionID software. We have confirmed that the identification is accurate.
Attached can be found the simulation file with each of the expected ions, their revolutions frequencies in the 125th harmonic and expected yield from the LISE file attached.
Also attached are some figures from RionID that highlight the region of interest for the 124th and 125th harmonics. The center frequency of the 245 MHz resonator is closer to the 124th harmonic for 229Th+89 which is located at 244.769 MHz.
If necessary, we can slightly shift the resonator curve to higher frequencies to fine-tune the signal-to-noise ratio for 229Th+89. |
|
42
|
Tue Jun 11 21:23:11 2024 |
Julian, Imke | General | How to read out voltage |
1.) If not already opened, open the Medusa Laser Control software, see picture:
2.) In the "view" submenu, choose "proteus status".
3.) At the bottom of the list, the K250 shows the scaled voltage. |
|
2
|
Tue Apr 16 16:28:21 2024 |
Danyal | General | Great |
Thanks Jan! |
|
11
|
Sat Jun 1 18:55:18 2024 |
Carsten | Analysis | Go4 Analysis Version for DAQ1 (atplaser) |
Small enhancements and minor corrections / bug fixes are made to the original version of the online GO$ for DAQ1.
Assignment of channel names corrected, condition names adapted to present DAQ
Potential pitfalls are commented in the code.
The old version is untouched in its old directory.
The new version is in directory ~/go4/229Th. This version should be used for DAQ1 !
Some minor changes will still be needed to be done.
Please comment changes in the code with date and name and write into Elog. |
|
6
|
Wed May 29 10:54:21 2024 |
Shahab, Jan | General | Gas Target Events with new timing system |
Using the new timing system, it is possible to grab any events as pulses, but also as long inter event gates under GENESYS. Many instances of GENESYS can be running on ACO computers, so that there is no conflict, if an instance is running in main control room or another in ESR-Messhütte.
GENESYS Settings:
Inter-Event for 162 up and 163 down, signaling the gas target cycle. The signal can either be:
- Controlled automatically by the control system (sub chain patterns)
- Set to manual operation during setup or experiment.
"activating" the condition in GENESYS by clicking on the small "A" button in the condition. (B) us achieved by "deactivating" the condition in GENESYS, by clicking again on the "A", it turns into a "-". After this, it is possible to manually set the level "hi" or "low" on the left box. As a result a orange bar goes up and down as an indicator. Any time you can switch to automatic change by pressing on "-" again.
Using this new timing system, the old hardware in the main control room is not needed anymore.
Additional Information:
In the old experiments, we used the new control system events but still using the old hardware in the main control room. Please see:
https://elog.gsi.de/esr/E121/13 |
|
78
|
Sat Jun 15 03:46:34 2024 |
Night shift | Accelerator | GSI down |
All quadrupole and dipole magnets at SIS and ESR are out of order. Repairs can be expected earliest tomorrow evening. No shifts will take place before 6pm. Have a look at your mails for details. |
|
1
|
Tue Apr 16 14:42:37 2024 |
Jan | General | G-PAC Proposal |
|
|
38
|
Mon Jun 10 08:57:35 2024 |
Carsten/Konstantin | DAQ | Further Tests from Sunday 2024-06-09 - new voltages and tresholds for PMTs - testdata in files |
Voltages and thresholds increased for PMT Middle and North (in order to account for the ADC measurement in DAQ2
|
PMT South ("braodband") ET9422 | 1500 V | thresh: 7
| |
PMT Middle ("smallband") ET9423 | 2650 V | thresh: 10
| |
PMT North ("smallband") ET9423 | 2650 V | thresh: 12
|
Tests with laser
Thresholds adjusted for PD SO and PD NO.
Smaller adjustements in the analysis cdoe of DAQ1 (directory 229Th) to deal with the proper alignment of laser steps (Step-spectra). Seems to solved now.
DAQ rate/trigger rate DAQ1 - interference with Labview
DAQ1 can be started without connection to Labview server after some timeout (~ 1min) or so the usual trigger rtate of 200 Hz can be seen in mbs (via: "sh acq" command)
If the Labview server is closed, e.g. during the run or between to laser runs - the DAQ rate drops to 30 Hz only. Very likely MBS is busy trying to fetch data from the non existing Labiew server.
The problem can be solved by leaving closing the the DAQ (MBS not Go4...) and restarting mbs/DAQ, e.g. via @shutdown, leave mbs, resl, start mbs, Qstartup, start acq.
Of course, also Go4 needs to be restarted to establish a new connection to MBS.
The DAQ rate of DAQ1 should be regularly checked with sh acq !
Test data
DAQ1: 005.lmd
DAQ2: 010.lmd
both rubbish, partially adjustments of threshilds etc.
~2.7e6 ions (238U92+)
201 laser steps 550nm, 549nm, 50 shots per step
DAQ1: 006.lmd
DAQ2: 011.lmd/012.lmd
Threshold for PD SO not adjusted
restart
DAQ1: 007.lmd
DAQ2 013-017.lmd
same with few 10^5 ions:
DAQ1: 008.lmd
DAQ2: 018-020.lmd |
|
53
|
Wed Jun 12 18:48:43 2024 |
Afternoon shift | Runs | First laser scans |
|
Time | Part. Det. Int | ESR-intensity | cooler-HV | LMD-DAQ1 Files | LMD-DAQ2 Files | scan range(nm) | number of positions | dwell time(s) | n loops | comments
| |
19:15 | 38257 | xx e x | 104416 | 10 | 21-23 | 550.1 - 550.9 | 201 | 2s | 8 | 40 SIS injections. Very short lifetime, further investigation is needed. preset_2024-06-12_19-08-23.mps
| |
20:22 | 53056 | xx e x | 104416 | 11 | 24-25 | 550.1 - 550.9 | 201 | 1s | 3 | 40 SIS injections. Only PDetector behing cooler, retracted by 8 mm. Still short lifetime.
| |
20:58 | 40500 | xx e x | 104416 | 12 | 26-26 | 550.1 - 550.9 | 201 | 1s | 2 | 40 SIS injections.
|
|
|
49
|
Wed Jun 12 12:12:44 2024 |
Konstantin Mohr, Julien Spahn, Jonas Koedel, Bernhard Maass | Accelerator | First Scraper Scan |
Thorium is in the ESR, we have time to check the beam position with the scrapers.
Beam Intensity in the ring 6E-5
Laser stabilization:
x1: -0.050
y1: -0.244
x2: 0.151
y2: -0.489
DS1VU: starting in negatives, touches beam at -0.1mm, beam gone at 0.5mm (laser gone)
due to betatron oscillation, vertical beam center is +0.5mm, beam diameter 1.2mm
DS1HA: starting in negatives, hf artifacts are gone at -25mm, touches beam at -17.2mm, beam gone at -16.4mm (laser gone)
DS1HA: starting in positives, hf artifacts are gone at +2mm, touches beam at -7.1mm, beam gone at -7.9mm
horizontal beam center is at -12.2mm, beam diameter 2.1mm (scraper is 8mm wide)
DS2VU: starting in negatives, touches beam at 0.4mm, beam gone at 1.0mm (laser gone)
due to betatron oscillation, vertical beam center is 1.0mm, beam diameter 1.2mm
DS2HA: starting in positives, hf artifacts are gone at 6mm, touches beam at -3.5mm, beam gone at -4.3mm (laser is scraped)
DS2HA: starting in negatives, hf artifacts are gone at -27mm, touches beam at -14.4mm, beam gone at -14.1mm (laser is scraped)
horizontal beam center is at -9.2mm, beam diameter 2.9mm (scraper is 8mm wide)
After the measurement of the ion beam position we superimposed the laser beam (see attachment 1). |
|
26
|
Thu Jun 6 19:42:20 2024 |
Carsten | Detectors | Exchange of amplifer channels / cables channels / HV voltage cables for PMT south |
In order to check if the problem of regular burst of pulses on the PMT south is related to amplfier channels and or the HV cable, the cheannels of the amplifiers in the ESR were changed. Likewise, a different HV cable is now used for the supply of the PS.
The problem still persists. It is visible on all three cable lines from ESR to Messhuette (100x DAQ1 cables , and 10x / 100x cables DAQ2). |