ELOG E142

Backup of data to the external RAID disks

322.01 - 321.60 nm

We scan the wavelength scan range is 322.01 - 321.60 nm

before the first scan of the new wavelength range we changed the high voltage divider ratio in Labview from 248514 to 248517, which is the correct value for this voltage. This leads to slightly higher cooler voltages in the log.

Time	SIS-intensity	cooler-HV	LMD-DAQ2 file nr	LMD-DAQ1 file nr	scan range(nm)	step width(nm)	dwell time(s)	particles counted	comments
04:40	1.9e9	209625	0203	7938	322.01 - 321.60	0.002	5s	8830
05:20	1.7e9	209626	0204	7939	322.01 - 321.60	0.002	5s	7800
06:00	1.6e9	209626	0205	7940	322.01 - 321.60	0.002	5s	8500
06:45	1.7e9	209620	0206	7941	322.01 - 321.60	0.002	5s	9400	cooler HV decreased slowly by a few V, jumped back at ~7:03
07:25	1.8e9	209620	0207	7942	322.01 - 321.60	0.002	5s	9300
08:05	1.75e9	209620	0208	7943	322.01 - 321.60	0.002	5s	9100
08:45	1.7e9	209618	0209	7944	322.01 - 321.60	0.002	5s	9000	cooler HV decreased 5V to 209614 and jumped back to initial value after ~5s
09:25	1.7e9	209618	0210	7945	322.01 - 321.60	0.002	5s	8500
10:05	1.9e9	209618	0211	7946	322.01 - 321.60	0.002	5s	9200	cooler HV decreased steadily to 209611 V during the run
10:45	1.9e9	209611	0212	7947	322.01 - 321.60	0.002	5s	7500	After injecting into the ESR, we saw after cooling some tails left and right of the Shottky peak of Th. Was not there in the runs before. After some minutes it disappeared in the spectrum
11:35	2e9	209611	0213	7948	322.01 - 321.60	0.002	5s		it seems to be that much lesser ions are stored in the ESR - counter shows low rate - ABORTED laser didn't start scanning
11:58	1.75e9	209615	0214	7949	322.01 - 321.60	0.002	5s	7700	cooler HV jumped to 209610 at 12:12 and stayed there
12:53	1.85e9	209611	0215	7950	322.01 - 321.60	0.002	5s	7155	cooler HV increased slowly from initial value to ~209618
13:32	1.9e9	209612	0216	7951	322.01 - 321.60	0.002	5s	6638
14:39	1.8e9	209610	0217	7952	322.01 - 321.60	0.002	5s	6815	Voltage was jumping around from 209610 up to 209624 and back
15:20	1.75e9	209612	0218	7953	322.01 - 321.60	0.002	5s	8400	In contrast to the previous measurement, the cooler voltage was drifting by about 3V around 209612
16:00	1.7e9	209612	0219	7954	322.01 - 321.60	0.002	5s	7920
16:58	1.5e9	209612	0220	7955	322.01 - 321.60	0.002	5s	4577	PMT North voltage and threshold modified Entry 221, Ecooler voltage dcreased to 209609 V, weak injection
18:09	1.62e9	209609	0221	7957	322.01 - 321.60	0.002	5s		During the last injection the beam suddenly got lost during the scraping, File 7956 was discarded since go4 was still during the startup of mbs
18:49	1.69e9	209609	0222	7958	322.01 - 321.60	0.002	5s	6133
19:49	1.6e9	209610	0223	7959	322.01 - 321.60	0.002	5s	7035
20:29	1.78e9	209611	0224	7960	322.01 - 321.60	0.002	5s	4490
21:12	1.86e9	209622	0225	7961	322.01 - 321.60	0.002	5s	10296	Note that the cooler voltage is increased. Particle number might be overestimated since it was read when the beam was already dumped.

214

Mon Apr 11 22:33:16 2022

Carsten

General

213

Mon Apr 11 22:14:51 2022

Konstantin, Sarper

Changing of the wavelength range

It is planned to change the scan range of the laser wavelength from 322.41 - 322.0 nm to 322.01 - 321.6 nm @ 4 a.m.

212

Mon Apr 11 18:57:18 2022

Rodolfo

Rodolfo, Sarper and Konstantin

New flashlamps

We (Sarper, Konstantin and me) have changed the old flashlamps (with ~ 26 Mio. shots) by new "fresh" ones. We have also exchange the dye. Here are some parameters of the laser we measured with the new flashlamps and dye*:

- Output energy after the Quanta-Ray (@ 532 nm): 598 mJ.
- Seed energy for Cobra (@ 532 nm): 505 mJ.
- Correction factor for monitor; 15.9.
- Output energy after Cobra's main amplifier cell (@ 640 nm): 107 mJ.
- Output energy after SHG (@ 320 nm): 15.8 mJ.

* all values are average over 500 shots.
** below you can see a picture of the "old" flashlamps.

211

Mon Apr 11 18:46:31 2022

Paul, Konstantin, Sarper, David

Alignment-check

We cross-checked the laser-ion alignment. The horizontal position was optimized. However, 
since the laser beam is much larger than the ion beam, this was not an issue for measurements, which
have been performed during the last shifts.
The modified parameters of the stabilization system are attached.

210

Mon Apr 11 14:45:11 2022

Afternoon shift runs 11.04

We continue scan the new wavelength scan range is 322.41 - 322.00 nm

Time	SIS-intensity	cooler-HV	LMD-DAQ1 file nr	LMD-DAQ2 file nr	scan range(nm)	step width(nm)	dwell time(s)	particles counted	comments
14:45	1.9e9	209618	0189	7924	322.41 - 322.00	0.002	5s	9100
18:54	1.83e9	209616	0191	7926	322.41 - 322.00	0.002	5s	7300
19:34	1.7e9	209615	0192	7927	322.41 - 322.00	0.002	5s	7110
20:13	1.8e9	20961X	0193	7928	322.41 - 322.00	0.002	5s	6730
20:53	1.8e9	209614	0194	7929	322.41 - 322.00	0.002	5s	7550	During the scan the ecooler voltage changed to approximately 209613
21:43	1.7e9	209614	0195	7931	322.41 - 322.00	0.002	5s	7000
22:30	1.6e9	209612	0197	7932	322.41 - 322.00	0.002	5s	7300
23:10	1.4e9	209614	0198	7933	322.41 - 322.00	0.002	5s	6100	For this measurement, ESR_Ring went red, we realized only after completing the measurement. The sections went red are Dipole Correction Points (GE01KP17-18-19-20, 4 in total) @~23:45 and fixed @01:35...
01:52	1.6e9	209614	0199	7934	322.41 - 322.00	0.002	5s	7151
02:32	1.7e9	209616	0200	7935	322.41 - 322.00	0.002	5s	8368
03:22	1.8e9	209617	0201	7936	322.41 - 322.00	0.002	5s	7005
04:01	1.9e9	209616	0202	7937	322.41 - 322.00	0.002	5s		Ecooler voltage increased 4 volts during the run

209

Mon Apr 11 12:50:22 2022

Kristian

Th lifetime

We used the counter to measure the lifetime. During the 30 min scan time dropped only slowly. 

During a longer break, e.g., when the laser flash lamps are changed, one could take data over a longer time.

208

Mon Apr 11 11:05:35 2022

Sebastian, Kristian

Kristian, Sebastian, Alexandre, Danyal, Paul

Check laser power

we checked the UV laser power at 10:15 am. It was only 8.5 - 9 mJ. Pumping power was 460 mJ, which is the maximum output of the current system. We should change the flashlamps soon

207

Mon Apr 11 10:31:07 2022

General

new laser wavelength scan range 322.41 - 322.00 nm

new wavelength scan range is 322.41 - 322.00 nm

at 10:31

Time	SIS-intensity	cooler-HV	LMD-DAQ1 file nr	LMD-DAQ2 file nr	scan range(nm)	step width(nm)	dwell time(s)	particles counted	comments
10:31	1.75e9	209617	0180	7915	322.41 - 322.00	0.002	5s	2300	ABORT ... no laser ... beam stabilization was off
10:40	xxe9	209617	0181	7916	322.41 - 322.00	0.002	5s	xxx	ABORT ... laser did not start from 322.41 nm
10:42	xxe9	209615	0182	7917	322.41 - 322.00	0.002	5s	xxx	ABORT ... laser did not start from 322.41 nm
10:45	2.1e9	209616	0183	7918	322.41 - 322.00	0.002	5s	9236	HV E-cooler fluctuates slowly over 3 V
11:22	1.7e9	209616	0184	7919	322.41 - 322.00	0.002	5s	xxx
12:02	2.0e9	209616	0185	7920	322.41 - 322.00	0.002	5s	9660
12:43	1.8e9	209618	0186	7921	322.41 - 322.00	0.002	5s	6533	HV E-cooler jump to ~209700k for ~10 seconds and than back to 209618
13:24	2.0e9	209617	0187	7922	322.41 - 322.00	0.002	5s	9500
14:05	2.0e9	209618	0188	7923	322.41 - 322.00	0.002	5s	9220

206

Mon Apr 11 10:17:01 2022

Danyal

Danyal, Alexandre, Kristian, Sebastian

Interlock - reset

10:17 
Wie heutemorgen in der Sitzung (morning briefing) vereinbart, 
führt Herr Florenkowski einen Interlock und danach einen Reset von E02MK durch. 
Das dauert nur ca. 15 min. 

nach dem interlock wurde der ESR "rot" 

Um 10:21 war das problem gelöst und der ESR war wieder "blau"

205

Mon Apr 11 07:54:37 2022

Patrick, Volker, Prannay, Danyal, Alexandre, Sebastian, Kristian

Jump in E-cooler voltage

We saw a jump in the E-cooler voltage at about 7:50. 
jump from 209619 to 209610 V 

At 7:56 it jumped back to 209619 V
seems stable now

204

Mon Apr 11 04:26:53 2022

Patrick

DAQ

Next wavelength range

Measurements with the next wavelength scan range should be started roughly around 10:00 am.
The next wavelength scan range is planned to be 322.41 - 322.00 nm, again with a step size of 0.002 nm, 5s dwell time and 2 loops.
This range includes roughly a third of the first scan range.

203

Sun Apr 10 22:47:05 2022

Runs night shift 10.04 + morning shift 11.04

These are the measurement runs of the night shift (10/11.04.).

Wavelength range is still 322.81 - 322.40 nm.

Time	SIS-intensity	cooler-HV	LMD-DAQ1 start-end	LMD-DAQ2 start-end	scan range(nm)	step width(nm)	dwell time(s)	particles counted	comments
23:05	1.75e9	209620	0165 - 0165	7901-7901	322.81 - 322.40	0.002	5s	8500
23:57	1.?e9	209620	0166 - 0166	7902-7902	322.81 - 322.40	0.002	5s	8500	The HV of PMT south was changed from 2.5kV to 3kV
00:35	1.4e9	209620	0167 - 0167	7903-7903	322.81 - 322.40	0.002	5s	4100
01:18	1.75e9	209620	0168 - 0168	7904-7904	322.81 - 322.40	0.002	5s	4400
01:58	1.4e9	209620	0169 - 0169	7905-7905	322.81 - 322.40	0.002	5s	7700	The ESR went red after this run. The on-call service was called because of some power supply failure, ETA: 45min.
04:12	1.75e9	209620	0171 - 0171	7906-7906	322.81 - 322.40	0.002	5s	7600	With the start of this run, the wavemeter, labview and the python script were restarted. The python script was slightly adjusted.
04:50	1.6e9	209620	0172 - 0172	7907-7907	322.81 - 322.40	0.002	5s	8300
05:31	1.6e9	209619	0173 - 0173	7908-7908	322.81 - 322.40	0.002	5s	8100
06:09	1.6e9	209615	0174 - 0174	7909-7909	322.81 - 322.40	0.002	5s	8000
06:52	1.8e9	209615	0175 - 0175	7910-7910	322.81 - 322.40	0.002	5s	8800	at 07:08 the cooler voltage jumped from 209615 V to 209619 V
07:30	1.9e9	209619	0176 - 0176	7911-7911	322.81 - 322.40	0.002	5s	forgotten	at 07:50 the cooler voltage jumped from 209619 to 209610 V and back again at to 209619 V
08:18	1.8e9	209619	0177 - 0177	7912-7912	322.81 - 322.40	0.002	5s	9100	08:47 the cooler voltage jumped from 209618 to 209614 V and back again at to 209618 V
08:55	1.75e9	209619	0178 - 0178	7913-7913	322.81 - 322.40	0.002	5s	8300
09:36	1.6e9	209619	0179 - 0179	7914-7914	322.81 - 322.40	0.002	5s	8194

The SIS intensity is taken directly before injection to ESR. Not the SIS peak intensity as in yesterday's table.

202

Sun Apr 10 15:29:53 2022

Rodolfo

Status - Laser system

We have checked the laser system.

- The pump laser has ~ 23Mio shots. The total output energy has dropped to about 475 mJ. Maybe it is time to install new fresh flashlamps. In case the accelerator is going to have any mantainance tomorrow (Monday) then we can take the oportunity to exchange the flashlaps.
- The dye laser is pumped with 470 mJ (angle of lambda/2 plate = 112°).
- The energy after the second harmonic is 11,3 mJ @ 646 nm. We are using the Sarper's calibration table (635 nm - 646 nm)

201

Sun Apr 10 15:29:37 2022

Carsten,Sarper

Ecooler failed

Ecooler failed @15:23 Carsten is fixing it
Fixed @16:00

200

Sun Apr 10 15:16:19 2022

Carsten, Rodolfo, Sarper