 Wed Apr 20 10:09:50 2022, Rodolfo, Laser, Optic with spots 
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| 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. |
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Wed Mar 23 15:38:15 2022, Carsten, General, Not all lights in the ESR can be switched off
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| 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 |
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Thu Apr 7 07:40:09 2022, Danyal, Max, Sebastian, DAQ, No beam and DAQs crashed
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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 |
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Fri Apr 8 09:13:38 2022, Ragan, Danyal, Accelerator, No beam
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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. |
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Fri Apr 1 15:27:00 2022, Rodolfo, Detectors, Nitrogen for UV-PMTs
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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 |
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Sun Apr 10 04:37:29 2022, Patrick, DAQ, Next wavelength range
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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. |
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Mon Apr 11 04:26:53 2022, Patrick, DAQ, Next wavelength range
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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. |
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Thu Apr 7 22:18:06 2022, Night shift 7.4-8.4, , Next scans
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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
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Time | SIS-intensity | cooler-HV | LMD-DAQ1 | LMD-DAQ2 | scan range(nm) | step width(nm) | dwell time(s) | comments
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00:20 | 1.4e9 | 209617 | 0065-0067 | 7810 | 323.2-321.2 | 0.01 | 4 | buggy DAQ? see Elog, file 0068 empty
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01:27 | 1.6e9 | 209606 | 0069-0070 | 7811 | 323.2-321.2 | 0.01 | 4 | buggy DAQ? see Elog, file 0071 empty
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02:15 | 1.6e9 | 209611 | 0072-0073 | 7812 | 323.2-321.2 | 0.01 | 4 | buggy DAQ? see Elog, file 0074-0075, 7813-7814 empty
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03:00 | 1.1e9 | ? | 0076-0077 | 7815 | 323.2-321.2 | 0.01 | 4 | buggy DAQ? see Elog and below, file 0078, 7816 empty
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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). |
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Sat Apr 9 19:50:40 2022, Carsten, , New thresholds for ADC of DAQ2 (starting with file0117)
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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 }; |
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Sun Apr 10 02:20:17 2022, Patrick, DAQ, New mbs startup guide
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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):
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| DAQ1 | DAQ2
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1 | ssh atplaser@r4l-41 | ssh stoe_exp@r4l-68
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2 | ThE142_2022 | see ID:179
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3 | cd mbsrun/th22 | cd mbsrun/th22cd /esr/usr/stoe_exp/E142Brandau/SCA... (auto complete with tab)
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// loop start | |
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4 | resl | resl
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5 | mbs | mbs
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6 | @startup | @startup
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7 | // connect go4 | // connect go4
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8 | sta ac | sta ac
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9 | // measure | // measure
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10 | sto ac | sto ac
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11 | clo fi | clo fi
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12 | exit | exit
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13 | // disconnect go4 | // disconnect go4
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14 | // go to step 4 | // go to step 4
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Note: At least in DAQ1, step 13 is necessary to be able to reconnect mbs to the rfio server. |
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Mon Apr 11 18:57:18 2022, Rodolfo, Laser, New flashlamps
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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. |
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Sat Apr 9 03:57:10 2022, Carsten, Accelerator, New Cooler voltage after the crash of the cooler
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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. |
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Fri Apr 8 09:32:32 2022, Ragan, Runs, NTCAP stopped
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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 |
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Fri Apr 8 10:44:55 2022, Ragan, Yuri, Danyal, Sergey, Runs, NTCAP stopped
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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 |
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Fri Apr 8 09:39:04 2022, Ragan, Runs, NTCAP started
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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 |
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Fri Apr 8 12:04:13 2022, Ragan, Runs, NTCAP started
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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 |
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Thu Apr 7 05:44:40 2022, Pierre-Michel, Ragan, DAQ, NTCAP settings
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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 |
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Thu Apr 7 03:09:36 2022, Carsten, DAQ, NTCAP running since 02:40
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Fri Apr 8 06:53:29 2022, Ragan, Runs, NTCAP data taking
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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 |
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Sat Apr 2 05:08:00 2022, Kristian, General, Morning shift
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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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