ELOG E0052

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.

Attachment 1: 2024_06_12_229Th_Lifetime_at_190MeV.png

Thu Jun 13 18:03:36 2024

Continuation: First 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
00:01		3e5	104438	13	27-29	550.1 - 550.9	201	2s	4	40 injections, there is still a fast decaying component, may be due to the higher electron current of 200 mA. Going back to 100 mA in next run and also put a "loose" scraper on the inside.

ntcap 2024-06-12_21-47-54

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
00:50	?	3e5	104438	14	28-	550.1 - 550.9	201	1s	6	30 injections, e-cooler current at 100mA, scraper GE01GD2ID (north arc, inner scraper) now at position +30mm, medusa crashed when started, laser position was lost and retrieved by resetting the beam position stabilization
01:43	25700	3e5	104438	15	31-32	550.1 - 550.9	201	1s	6	e-cooler current 100mA, NA position -30 activated, NI +28, SA -28, DS3HG +10
02:32	21750	4e5	104417	16	33	550.1 - 550.9	201	1s	3	reduced iterations due to short life time
02:54	29200	4e5	104417	17	34	550.1 - 550.9	201	1s	3
03:16	(?)	4e5	104417	18	35	550.1 - 550.9	201	1s	3
03:40	33700	5e5	104417	19	36	550.1 - 550.9	201	1s	3
04:03	31600	5e5	104417	20	37	550.1 - 550.9	201	1s	3
04:25	29200	4e5	104417	21	38	550.1 - 550.9	201	1s	3
04:46	27500	4e5	104417	22	39	550.1 - 550.9	201	1s	3
05:08	30400	4e5	104417	23	40	550.1 - 550.9	201	1s	3
05:31	31300	4e5	104417	24	41	550.1 - 550.9	201	1s	3
05:56	30000	3e5	104417	25	42	550.1 - 550.9	201	1s	3
06:18	24500	4e5	104417	26	43	550.1 - 550.9	201	1s	3	Morning shift took over: Constantine, Peter, Lukas, Jonas, Dounia
06:43				27	44	550.1 - 550.9	201	1s	3	Medusa crashed when starting the laser scan
06:57		4e5	104417	28	45-46	550.1 - 550.9	201	1s	3	DAQ1 started a bit later since we needed to restart and connect the file server again; after starting laser scan we noticed that the beam is gone on glass disk, reason was likely user error as medusa was set to send the laser to 500.9nm instead of 550.9nm
07:27	11800	4e5	104417	29	47	550.1 - 550.9	201	1s	3
07:51	23500	4e5	104417	30	48	550.1 - 550.9	201	1s	3
08:14	15000	5e5	104417	31	49	550.1 - 550.9	201	1s	3
08:37	35300	5e5	104417	32	50	550.1 - 550.9	201	1s	3
08:58	32800	5e5	104417	33	51	550.1 - 550.9	201	1s	3
13.06.2024 17:32	23 500	5e5	104412	35	52	550.1 - 550.9	201	1s	3	First scan of afternoon shift. 30 Injections. Electron current was set to 30 mA. (Note added 2024.06.14 17:55 - Carsten: To what I remember electron current is 80mA) Dye was changed before this scan. Wavemeter overexposed on the second scan for 2-3 steps, not sure if during the stepping or actual measurement. In the middle of the third scan, medusa crashed.
13.06.2024	xx	5e5	104417	36	53	550.1 - 550.9	201	1s	3	25 Injections 75Hz particle detector south, medusa crashed immediately, laser controller was locked up. Restarting the laser controller solved the issue.
13.06.2024 18:30	28 200	5e5	104412	37	54	550.1 - 550.9	201	1s	3	25 Injections , DAQ1 no data collected (no start acquisition pressed)
13.06.2024 18:50	26 000	5e5	104412	38	55	550.1 - 550.9	201	1s	3	23 of 25 Injections, two were empty injections from SIS
13.06.2024 19:13	31 600	5e5	104412	39	56	550.1 - 550.9	201	1s	3	29 of 30 Injections, one was empty injections from SIS
13.06.2024 19:45	34 700	5e5	104411	40	57	550.1 - 550.9	201	1s	3	30 of 30 Injections
13.06.2024 20:07	33 300	6e5	104411	41	58	550.1 - 550.9	201	1s	3	30 of 30 Injections. Note: before and after run, the laser was exactly in the middle of the screen, but went to its proper position (slightly left of the middle) during the scan.
13.06.2024 20:36	29 900	7e5	104411	42	59	550.1 - 550.9	201	1s	3	30 of 30 Injections. Note: Before the run ad during the first scan, the laser was above the middle. In the third scan, it was back in its proper position.
13.06.2024 20:57	28 900	7e5	104411	43	60	550.1 - 550.9	201	1s	3
13.06.2024 21:18	26 000	7e5	104411	44	61	550.1 - 550.9	201	1s	3	27 of 30 Injections
13.06.2024 21:40	18 000	6e5	104411	45	62	550.1 - 550.9	201	1s	3	out of the first injections 4 were with low energy and 4 did not arrive at all, for the rest, pretty much every second injection is missing. Checking with HKR.
13.06.2024 22:02	24 900	7e5	104411	46	63	550.1 - 550.9	201	1s	3	Same thing with injection.
13.06.2024 22:23	31 700	7e5	104411	47	64	550.1 - 550.9	201	1s	3
13.06.2024 22:46	30 900	7e5	104411	48	65	550.1 - 550.9	201	1s	3
13.06.2024 23:09	33 100	7e5	104411	49	66	550.1 - 550.9	201	1s	3	Laser shifted to the left
13.06.2024 23:33	25 200	7e5	104411	50	67	550.1 - 550.9	201	1s	3
13.06.2024 23:55	28 600	7e5	104411	51	68	550.1 - 550.9	201	1s	3	We moved the laser back to the original position using the MRC
14.06.2024 00:52	33 100	8e5	104410	52	69	549.85 - 550.9	239	1s	3	Widen scan range to account for the difference between wavelength vac. vs. wavelength air; Laser shifted to the left
14.06.2024 01:20	29 800	8e5	104410	53	70	549.85 - 550.9	239	1s	3
14.06.2024 01:44	--	7e5	104410	54	71	549.85 - 550.9	239	1s	3	Medusa crashed and was restarted; measurement interrupted; connection of MBS to Labview server crashed and MBS and go4 were restarted (DAQ1)
14.06.2024 02:03	34 700	8e5	104410	55	72	549.85 - 550.9	239	1s	3
14.06.2024 02:26	31 400	7e5	104411	56	73	549.85 - 550.9	239	1s	3
14.06.2024 02:49	--	7e5	104411	57	74	549.85 - 550.9	239	1s	3	Medusa crashed and was restarted; measurement interrupted
14.06.2024 02:51	--	7e5	104411	58	75	549.85 - 550.9	239	1s	3	Medusa crashed and was restarted;

The Medusa crash also crashed the Cobra Laser. We tried to restart it but afterwards the power of the Laser was more than one order of magnitude lower than before. It is not clear what caused the problem, Rodolfo is on his way to GSI now to fix the issue.

Attachment 1: 2024_06_13_229Th_Lifetime_at_190MeV_afterscraping.png

Attachment 2: 2024-06-13_23-13-55-242.png

Fri Jun 14 06:38:41 2024

Konstantin Mohr, Bernhard Maass, Peter Micke, Lukas Kau, Dounia Boudefla

Morning runs

Very successful shift, no crashes until 11:10
Previous night shift had problems with the pulse laser starting around 3am.
Something was loose at the FCU. Rodolfo was called in and was able to fix it.

the scan direction is from higher wavelength to lower wavelength, even though it is noted otherwise here and in the software.

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
14.06.2024 06:35	36500	7e5	104410	59	76	550.1 - 550.9	201	1s	3
14.06.2024 07:00	24600	8e5	104409	60	77	550.1 - 550.9	201	1s	3
14.06.2024 07:23	22900	8e5	104410	61	78	550.1 - 550.9	201	1s	3
14.06.2024 07:44	27000	8e5	104410	62	79	550.1 - 550.9	201	1s	3
14.06.2024 08:06	31000	7e5	104410	63	80	550.1 - 550.9	201	1s	3
14.06.2024 08:29	29500	8e5	104410	64	81	550.1 - 550.9	201	1s	3
14.06.2024 08:52	26800	8e5	104410	65	82	550.1 - 550.9	201	1s	3
14.06.2024 09:13	33500	8e5	104410	66	83	550.1 - 550.9	201	1s	3
14.06.2024 09:35	15700	8e5	104410	67	84	550.1 - 550.9	201	1s	3	only 10 shots accumulation
14.06.2024 09:59	35000	8e5	104410	68	85	550.1 - 550.9	201	1s	3	back to 30 shots accumulation
14.06.2024 10:24	33600	8e5	104410	69	86	550.1 - 550.9	201	1s	3
14.06.2024 10:48	35500	9e5	104410	70	87	550.1 - 550.9	201	1s	3
14.06.2024 11:09		8e5	104410	71	88	550.1 - 550.9	201	1s	3	data crash, labview disconnected

2024-06-14 (note added): Intensities from ESR trafo are not reliable at low internisties, offset can change substantially. Use trafo only with ion numbers sginificantly higher than 1e6.

Fri Jun 14 14:44:51 2024

Pizza shift

the scan direction is from higher wavelength to lower wavelength, even though it is noted otherwise here in the software.
From hardware side, the laser can only scan in one direction: long wave length to short wave length, independent of what is written in the tables.

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
14.06.2024 12:45	38900	2e5	104411	72	89	549.6 - 550.4	201	1s	3	starting with 50 accumulation
14.06.2024 13:13	41400	2e5	104411	73	90	549.6 - 550.4	201	1s	3	there was a :10 crash during the injection, laser scan started normally.
14.06.2024 13:41	39500	2e5	104411	74	91	549.6 - 550.4	201	1s	3
14.06.2024 14:38	67750	2e5	104412	75	92	549.6 - 550.4	201	1s	3	afternoon shift takes over. After short break from hkr to optimize beam, proceeding with 30 injections, particle number detector might not have been reset, check next run
14.06.2024 15:02	34500	2e5	104412	76	93	549.6 - 550.4	201	1s	3
14.06.2024 15:38	27500	1e5	104412	77	94	549.6 - 550.4	201	1s	3
14.06.2024 16:01	25300	1e5	104412	78	95	549.6 - 550.4	201	1s	3
14.06.2024 16:23	28700	1e5	104412	79	96	549.6 - 550.4	201	1s	3	At around 550.2 nm the wavemeter is overexposed
14.06.2024 16:48	xxx	xx	xx	80	97	xx	xx	xx	xx	empty file , no laser scan, work on laser, while trying to adjust the wavemeter, we tried to move the laser using medusa, at some point, this caused the cobra to go into error mode again, onlz a restart could solve it. As a consequence, we still do not know if the wavemeter coupling is optimal
14.06.2024 17:17	30000	1e5	104412	81	98	549.6 - 550.4	201	1s	3	wavemeter coupling looks good now
14.06.2024 17:41	56900	1e5	104412	82	99	549.6 - 550.4	201	1s	3	ratemeter was probably not reset
14.06.2024 18:04	8100	1e5	104412	83	100	549.6 - 550.4	201	1s	3	really bad injection (looked fine (?)), low ion count from SIS, they exchanged a cathode @UNILAC
14.06.2024 18:42	3200	3e4	104412	84	101&102(automatically opened new file without command after 1GB?)	549.6 - 550.4	201	1s	3	problems with accelerator: after deacceleration the beam is gone. Scraper position has moved(?). The cooling water from GSI is too warm, so we had to shut down the laser. NTCAP restarted. And NTCAP restarted again @20:39 for test data for Shahan.

Thu Apr 25 16:34:05 2024

Efficiency of Fluorescein27

The figure below shows the efficiency of Fluorescein27 vs. Wavelength. Each point was averaged over 500 laser shots.

Dye Laser: Sirah, Cobra Strech.
- Solvent: Ethanol + H2O.
- Concentration Oszillator: 0.4 g + 0,2 g/l NaOH.
- Concentration Main Amplifier: (1/8) Concentration Oscillator .

Pump Laser: InnoLas, SpitLight 1500-30
- Seeding energy: 550 mJ / Pulse.

Note. Dye was mixed on 28.04.2022

Attachment 1: Fluorescein27_Efficiency.png

Wed May 29 09:49:30 2024

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

Attachment 1: Laserstrahl-at-EKühler_2024-05-03_#014.jpg

Attachment 2: Laserstrahl-at-EKühler_2024-05-03_Photo.jpg

Mon Jun 3 19:42:06 2024

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

Attachment 1: LaserBeam-at-Screen_ESR-NO_08-06-2024.JPG

Thu Jun 6 07:12:49 2024

Konstantin Mohr

T-Scraper

The T-Scrapers can be driven by DeviceControl, which must be started from a console. To do so, first open the app-launcher and then select "Device Control", which is found under "Betrieb & Steuerung". Then select the appropriate context (should be the name of the experiment). After a short time the device icons will be present. The scrapers can be found in the last four columns and the second last row (see screenshot 1). By default, they should be colored like the following: DS1VU: green, DS1HA: yellow, DS2VU: green, DS2HA: yellow.

To test the scrapers, I made a measurement of the current laser position.

motor	laser position (mm)	screenshot
DS1VU (GECEDS1VU)	0	2
DS1HA (GECEDS1HA)	-10	3
DS2VU (GECEDS2VU)	2	4
DS2HA (GECEDS2HA)	-8	5

Note that the interlock of DS2VU is overridden when DS2HA is at 3mm. The interlock of DS1VU is overridden when DS1HA is at -4mm. The horizontal scrapers can only be moved when the corresponding vertical motors have reached their inner end positions.

Compared to the last position of Bi the horizontal and vertical positions deviate by approximately 5mm at all axes. However, since the electron cooler was completely dis- and reassembled in the meantime, it seems to be a reasonable starting point.

Attachment 1: 2024-06-06_07-15-20-802.png

Attachment 2: 2024-06-06_07-19-33-924.png

Attachment 3: 2024-06-06_07-48-36-884.png

Attachment 4: 2024-06-06_07-52-31-343.png

Attachment 5: 2024-06-06_07-54-53-972.png

Attachment 6: MRC_Parameters_06-06-2024.JPG

Fri Jun 7 11:14:04 2024

Trigger-signal for MRC

We are using a 2-Channel Function Generator (from Textronik) to generate the trigger signal for the MRC Beam Stabilization.

The triggers are (according to the MRC nomenclature):
- Tmin = 500 us.
- T1 = 40 us.
- T2 = 460 us.

Attachment 1: MRC_TriggerSignal_T1_06-06-2024.jpg

Attachment 2: MRC_TriggerSignal_T2_Tmin_06-06-2024.jpg

Attachment 3: GeneratorSettings_for_MRC_06-06-2024.jpg

Attachment 4: MRC_Parameters_06-06-2024_18-30.JPG

Tue Jun 11 21:38:35 2024

Julian, Imke, Rodolfo

Wavemeter HeNe long time stability

The HeNe was running over night and the measured laser frequency of the wavemeter was logged, see picture.
A significant drift of around 300 MHz is visible during the night.
It is possible, that the laser lab got too cold during the night, as the pulsed laser was not running.
For now, we put the wavemeter in a thermoinsulator box...

Attachment 1: HeNe_LangeMessung_11-06-2024.JPG

Wed Jun 12 17:12:13 2024

Julian, Danyal, Rodolfo

Timing für 229Th89+

We did the timing Ion-Beam Laser-beam time overlap.

The ion revolution frequency (and therefore the bunching frequency) is: 1.5429 MHz.

Attachment 1: Timing_229Th89_12-06-2024.JPG

Thu Jun 13 18:23:46 2024

Julian

Restarting the laser controller

If the laser controller is locked up again, the little display will show an error message after an attempted medusa scan.
To restart it, follow these steps:
1.) Unlock the beam stabilization.
2.) shut down medusa and the wavemeter software
3.) Turn off the 2 laser stages
4.) Close the shutter of the pumping laser
5.) Turn off and on the power button of the pulsed laser inside of the black box of the pump laser insertion.

To start again go back through the list.

Thu Jun 13 18:38:24 2024

Rodolfo Sanchez, Julian Palmes, Sebastian Klammes

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).

Attachment 1: MRC-settings-13-06-2024-after-dye-change-at-3pm.JPG

Tue Apr 16 14:42:37 2024

Jan

G-PAC Proposal

Attachment 1: G-22-00052.pdf

Tue Apr 16 16:28:21 2024

Danyal

Great

Thanks Jan!

Wed May 29 10:54:21 2024

Shahab, Jan

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

Attachment 1: 2024-05-29_11-07-40-259.png

Attachment 2: IMG_0465.JPG

Attachment 3: IMG_0466.JPG

Attachment 4: IMG_0467.JPG

Draft

Thu Jun 6 07:54:15 2024

Danyal

pressure gauges and ion pumps

yesterday (05.06.2024), firstly, the two ion pumps (underneath the fluorescence chamber) were switched off by the vacuum group (BjÃ¶rn Mai, Tel: 3438). Secondly, the two pressure gauges (located near the target) were switched off.  The pressure gauge at the fluo chamber is called E02VM3x and the pressure was 5.5e-11 mbar.  The other gauge is called IG2 and located further south, it measured 3.7e-11 mbar.  That was when ion pumps were still switched on.  Since ~10:45 (05.06.2024), the two ion pumps and the two ion gauges are switched off. There was no measurable change in the pressure after switching off the ion pumps.

Fri Jun 7 17:10:45 2024

Sebastian

XUV LED

Maximum XUV LED Voltage: 6.5V

Sat Jun 8 13:11:52 2024

Carsten

Put the go4login in atplaser .bashrc

Put the go4login in atplaser .bashrc in order to avoid that one always has to go to the go4 directory to set the environment variable.
go4login64 is now executed automaticlally and the environments are now set every time you open a (bash) shell.
A fixed version 6.3 is used. The login file might be changed back after the beamtime.

Tue Jun 11 21:23:11 2024

Julian, Imke