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  237   Wed Apr 20 10:09:50 2022 RodolfoLaserOptic 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
SHG_Compensator_mitFleck_19-04-2022.jpg
Attachment 2: UV_Umlenkspiegel_mitFleck_19-04-2022.jpg
UV_Umlenkspiegel_mitFleck_19-04-2022.jpg
  29   Wed Mar 23 15:38:15 2022 CarstenGeneralNot 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
  130   Thu Apr 7 07:40:09 2022 Danyal, Max, SebastianDAQNo beam and DAQs crashed
since shortly after 7 AM we have no beam in the ESR
(reason unclear) 

Both DAQs also crashed. 

Beam back in ESR at 7:20 or so 

Problems with restarting DAQ1 

Problems with restarting DAQ2 

Files names 7801 and 7804 and 0047 and 0050 cannot be used
  154   Fri Apr 8 09:13:38 2022 Ragan, DanyalAcceleratorNo beam
Cathode is being changed at the ion source. So no beam for the moment.

Sergey has been contacted to change from two ion bunches to a single ion bunch in the ESR.
  53   Fri Apr 1 15:27:00 2022 RodolfoDetectorsNitrogen for UV-PMTs
There was a question concerning the nitrogen we use to rinse the "Solar Blind PMTs".

- I have checked the nitrogen flow rate this afternoon (14:00) and it was a level of 0.2 LPM.
- I have increased this now to 0.4 LPM.

In the pictures below you can see where the "fine tunning" valves are located.

Bilder: R. Sánchez
Attachment 1: Stickstoff_f_PMTs.jpg
Stickstoff_f_PMTs.jpg
Attachment 2: Stickstoff_Flussrate.jpg
Stickstoff_Flussrate.jpg
  193   Sun Apr 10 04:37:29 2022 PatrickDAQNext wavelength range
Measurements with the next wavelength scan range should be started roughly around 12:00 noon. The plan is to go to lower wavelengths / higher energies.
So the next wavelength scan range would be 322.81 - 322.4 nm, again with a step size of 0.002 nm and 5s dwell time.

In the picture below you find some calculations/estimates for the current scan range.
Attachment 1: 2022-04-10_calculations_323nm.jpg
2022-04-10_calculations_323nm.jpg
  204   Mon Apr 11 04:26:53 2022 PatrickDAQNext 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.
  144   Thu Apr 7 22:18:06 2022 Night shift 7.4-8.4 Next scans
DAQ1: lxg1927:/data.local2/BeamTimeTh22/
DAQ2: lxg0155:/data.local2/E142/
LMD file name DAQ1:229Thor
LMD file name DAQ2:229Th

Shottky and NTCAP started at 23:53, center freq. 242.2M, 10MIQs, -30dBm
Shottky marker pos: 243.973MHz

TimeSIS-intensitycooler-HVLMD-DAQ1LMD-DAQ2scan range(nm)step width(nm)dwell time(s)comments
00:201.4e92096170065-00677810323.2-321.20.014buggy DAQ? see Elog, file 0068 empty
01:271.6e92096060069-00707811323.2-321.20.014buggy DAQ? see Elog, file 0071 empty
02:151.6e92096110072-00737812323.2-321.20.014buggy DAQ? see Elog, file 0074-0075, 7813-7814 empty
03:001.1e9?0076-00777815323.2-321.20.014buggy DAQ? see Elog and below, file 0078, 7816 empty




We were searching for a difference of a factor of twoin both DAQs. It turns out that the default value for the MBSstream server task is scale=2. In the main task this value is explicately set to scale=1. we will now (starting with filenumber: 0078) restart the 2nd DAQ with set stream_serv scale=1.

Also TDC is disabled.
From file number 0076 in DAQ2 : ADC thresholds:
unsigned short caen_V785AH_threshold_mod0 [32] =
{0x0100 , 0x0005 , 0x0004 , 0x0003 , 0x0004 , 0x0003 , 0x0005 , 0x0003 ,
0x0005 , 0x0004 , 0x0100 , 0x0100 , 0x0100 , 0x0100 , 0x0100 , 0x0100 ,
0x0100 , 0x0100 , 0x0100 , 0x0100 , 0x0100 , 0x0100 , 0x0100 , 0x0100 ,
0x0100 , 0x0100 , 0x0100 , 0x0100 , 0x0100 , 0x0100 , 0x0100 , 0x0100 };


Before the next scan, we realized, that the laser destabilized. For the rest of the shift we tried to get laser back online (see ID:149).
  189   Sat Apr 9 19:50:40 2022 Carsten New thresholds for ADC of DAQ2 (starting with file0117)
unsigned short caen_V785AH_threshold_mod0 [32] = 
                {0x0100 , 0x0004 , 0x0003 , 0x0004 , 0x0005 , 0x0004 , 0x0006 , 0x0005 ,
                 0x0006 , 0x0005 , 0x0100 , 0x0100 , 0x0100 , 0x0100 , 0x0100 , 0x0100 ,
                 0x0100 , 0x0100 , 0x0100 , 0x0100 , 0x0100 , 0x0100 , 0x0100 , 0x0100 ,
                 0x0100 , 0x0100 , 0x0100 , 0x0100 , 0x0100 , 0x0100 , 0x0100 , 0x0100 };
  190   Sun Apr 10 02:20:17 2022 PatrickDAQNew mbs startup guide
Connecting to the rfio server and opening a file is included in '@startup' now. Since mbs crashes reliably every 3 or 4 runs, it may be preferable to use the following procedure (which did not crash yet):

DAQ1DAQ2
1ssh atplaser@r4l-41ssh stoe_exp@r4l-68
2ThE142_2022see ID:179
3cd mbsrun/th22cd mbsrun/th22cd /esr/usr/stoe_exp/E142Brandau/SCA... (auto complete with tab)
// loop start
4reslresl
5mbsmbs
6@startup@startup
7// connect go4 // connect go4
8sta acsta ac
9// measure// measure
10sto acsto ac
11clo ficlo fi
12exitexit
13// disconnect go4 // disconnect go4
14// go to step 4// go to step 4


Note: At least in DAQ1, step 13 is necessary to be able to reconnect mbs to the rfio server.
  212   Mon Apr 11 18:57:18 2022 RodolfoLaserNew 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.
Attachment 1: Blitzlampe_26Mio_Schüsse_11-04-2022.jpg
Blitzlampe_26Mio_Schüsse_11-04-2022.jpg
  176   Sat Apr 9 03:57:10 2022 CarstenAcceleratorNew Cooler voltage after the crash of the cooler
After the restart of the cooler the Ohmlabs divider showed a voltage 16V lower than before. This could also be seen as a slight shift in the Schottky lines w.r.t to the bunching frequency and the marker. Corrected
the voltages at injection to DeltaU +3963V and in Sc 5/7 to + 3943V. Now perfect match with the old Schottky frequency.

Note: During the crash we found out that the device GECEKD2D did not show proper values. GECEKD2D is responsible for clearing the cooler of slow trapped ions ("clearing electrode").
Hence, the 16V may be due to partial filling of the space charge potential of te elctron beam.
  155   Fri Apr 8 09:32:32 2022 RaganRunsNTCAP stopped
Since there is no beam, NTCAP is stopped.

Carrier Frequency: 242.2 M
IQ Rate (S/s): 10 M
Reference level (dBm): -30

SC_2022-04-07_23-53-47
\IQ_2022-04-07_23-53-47
  158   Fri Apr 8 10:44:55 2022 Ragan, Yuri, Danyal, SergeyRunsNTCAP stopped
NTCAP is stopped. Sergey will now set an ion bunch instead of two in the ESR.

SC_2022-04-08_09-39-33
\IQ_2022-04-08_09-39-33
  157   Fri Apr 8 09:39:04 2022 RaganRunsNTCAP started
Carrier Frequency: 242.2 M
IQ Rate (S/s): 10 M
Reference level (dBm): -30

SC_2022-04-08_09-39-33
\IQ_2022-04-08_09-39-33
  161   Fri Apr 8 12:04:13 2022 RaganRunsNTCAP started
NTCAP is started for the data taking.

Carrier Frequency: 242.02 M
IQ Rate (S/s): 10 M
Reference level (dBm): -30

SC_2022-04-08_12-04-28
\IQ_2022-04-08_12-03-50
Attachment 1: IMG_0947.jpg
IMG_0947.jpg
  128   Thu Apr 7 05:44:40 2022 Pierre-Michel, RaganDAQNTCAP settings
Carrier Frequency: 244M
IQ Rate: 10M
reference Level: -30
RF - Attenuation: 40
IF - Attenuation: 19.9288

Masterpath p:\E142\sc
Masterpath p:\E142\IQ

Display: No Display

NTCAP data-taking is stopped at 5:44.

IQ_2022-04-07_02-40-05
SC_2022-04-07_02-40-05
  123   Thu Apr 7 03:09:36 2022 CarstenDAQNTCAP running since 02:40



  151  


Fri Apr  8 06:53:29 2022
RaganRunsNTCAP data taking
NTCAP is taking data since 07.04.2022 23:53:47

Carrier Frequency: 242.2 M
IQ Rate (S/s): 10 M
Reference level (dBm): -30

SC_2022-04-07_23-53-47
\IQ_2022-04-07_23-53-47


Attachment 1: IMG_0936.jpg



IMG_0936.jpg





  63  


Sat Apr  2 05:08:00 2022
KristianGeneralMorning 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







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