ELOG E142

Laser

Optic with spots

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.

Attachment 1: SHG_Compensator_mitFleck_19-04-2022.jpg

Attachment 2: UV_Umlenkspiegel_mitFleck_19-04-2022.jpg

Wed Jul 28 13:31:22 2021

Air filters

Filters (Hepa-) inside the flow boxes have been replaced.

Attachment 1: Flowbox_Filters.png

Draft

Wed Sep 8 21:44:55 2021

Preparation

Status	Arbeitspaket	Kommentare
	Laser und Laserlabor
***	Farbstofflaser	Elektronik wurde erneut.

Wed Mar 23 15:38:15 2022

Carsten

Not all lights in the ESR can be switched off

Three of the lights in the ESR cannot be switched off. It seems that these lights are now "emergency lights" (with battery?). We will need to find dark plastik foilor similar to cover those lights during our beam time

Sat Apr 2 05:08:00 2022

Kristian

Morning shift

I see no updates in the log. Is the morning shift taking place?

For now I will stay at home and be on call. I can be at GSI in 20 min. Please let me know the status.

01575 8731537

Sat Apr 2 10:22:21 2022

Rui-Jiu Chen, Ragan

Beam is in the ESR

Primary beam is in the ESR now. Markus and the team are tuning the ESR.

106

Wed Apr 6 08:31:54 2022

Danyal & Regina

ESR had some errors

Regina noticed that the ESR was "red" 

This means that there are some errors. 

She found: 
 
correction fields in the dipoles were off

GE01KP02 ... 05
GE01KP22 ... 24 

and some correction elements were off 

GE02KX6 
GE01KX2 


Regina would like to know since WHEN this is the case. 

In general, such errors affect the ion beam trajectory ! 

Regina will try to find out more details on how this may have shifted the orbit.

131

Thu Apr 7 08:14:03 2022

Yuri & Danyal

229Th89+ line in Schottky

GLOBAL calculations for the "content" of the Th line in the Schottky spectrum
(380 MeV/u exit energy, equilibrium charge state distribution)

Actinium 9.9%  - bare 

Thorium 42.4% - H-like

Protactinium 44.8% - He-like

Uranium 2.7% - Li-like

138

Thu Apr 7 14:04:36 2022

Paul Indelicato

no beam until 17:00

10:10  There is a problem with the UNILAC. 
The repair will take several hours. (4 hrs?) 

14:00  We just enquired about the status and when beam could be back. 
The current estimate is 17:00.

More work on laser aligment is required. 
Estimated time: 1 hour

179

Sat Apr 9 05:00:11 2022

Carsten

Draft Docs and cheat sheet

Please check the attached files,

and correct or enhance them.

Print out a copy

Attachment 1: e142_daq2_cabling.ods

Attachment 2: Documentation_for_beamtime_2022_.doc

207

Mon Apr 11 10:31:07 2022

Kristian, Sebastian, Alexandre, Danyal, Paul

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

214

Mon Apr 11 22:33:16 2022

Carsten

Backup of data to the external RAID disks

222

Tue Apr 12 21:56:54 2022

Volker, David, Pierre-Michel & Danyal, Alexandre, Sebastian

new laser wavelength scan range 321.62 - 321.10 nm

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.

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
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

Attachment 1: Ecooler12VdropOn13_04_22_9_52am.png

Attachment 2: Ecooler18VEcoolerJumpOn13_04_22_13_18pm.png

233

Fri Apr 15 12:42:18 2022

Max, Danyal, Carsten, Konstantin, Patrick, Simon

laser wavelength range changed: 320.12 - 319.60 nm

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

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
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

Attachment 1: VoltageJump1830.PNG

Mon Mar 25 06:22:12 143

Ken Ueberholz

XUV-Detector Rates

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

Attachment 1: Screenshot_20220404-000343_Gallery.jpg

Attachment 2: Screenshot_20220404-000327_Gallery.jpg

Attachment 3: Screenshot_20220404-000411_Gallery.jpg

Thu Oct 14 10:21:46 2021

Dismounting Cu-Mirror

We have dismounted the parabolic Cu-Mirror at ESR on 13.10.2021

Attachment 1: AusbauCuSpiegel_2021.jpg

Thu Mar 3 17:21:26 2022

MgF2 Windows

New reentrance viewports made of MgF2 have been installed at the ESR "Optical Detection Region". In the middle the old window (also MgF2) was kept into place.

Attachment 1: ESR_Schaufenster_Spiegelkammer_10-02-2022.jpg

Wed Mar 16 12:04:40 2022

Kristian