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ID Date Author Category Subject
  84   Sat May 17 21:06:52 2025 Rodolfo, Christopher, KristianLaserNew dye
We have exchanged the dye laser and filled the dye pumps with fresh dye. We also noticed that the seeder was off, we turned on again and set the pump energy to 350 mJ (at 532 nm).

The dye output energy is 150 mJ (at 592 nm)
  85   Sat May 17 21:27:17 2025 Wilfried, RodolfoLaserScraping the laser beam
The beam stabilization in not working properly. So we have turned it off. We also scraped the laser beam at the E-Cooler and bring the laser beam to the right position.

The Scraper GECEDS2VU cannot move vertically. Moved scraper horizontally to the inner position. It does not disturb the injection.
  86   Sat May 17 21:40:40 2025 Wilfried, Rodolfo, Hendrik, Ragandeep, YuriLaserEveningshift data runs

Time File Ohmlabs PTB 32 PTB 33 ESR intensity SC8 / 1e6 Typical SIS injections / 1e9 NTCAP file comments
2025-05-17 21:42 123 205820 20582X 20582X 6.5 3 SC_2025-05-17_21-41-07 mbs started, Go4 not connected, only written to disk, wrong scan region, we added 0.27 nm to values but should have subtracted it, see below **
124 file empty
2025-05-17 22:30 125 20582X 20582X 20582X 6.5 2.7 SC_2025-05-17_21-41-07 mbs and laser scan started in SC8, before scraping, first and maybe second wavelength affected
2025-05-17 23:10 126 20582X 20582X 20582X 0 2.7 SC_2025-05-17_21-41-07 beam killed by detectors
2025-05-17 23:42 127 20582X 20582X 20582X 5 2.75 SC_2025-05-17_21-41-07


** scan range was incorrect: For file #123 it was set to 593.42 nm - 592.82 nm
*** for #125, set to 592.85 nm - 592.25 nm
  87   Sun May 18 00:25:08 2025 Finn, Konstantin, DimitriosLaserNightshift data runs
Took over from afternoon shift and keep scanning
Time File Ohmlabs PTB 32 PTB 33 ESR intensity SC8 / 1e6 Typical SIS injections / 1e9 NTCAP file comments
2025-05-17 23:50 128 205820 20582X 20582X 2.6 2.8 SC_2025-05-17_21-41-07
2025-05-17 00:27 --- 205820 20582X 20582X --- 2.5 SC_2025-05-17_21-41-07 Injection was stopped due to radiation alarm at HTD
2025-05-17 02:01 129 205820 20582X 20582X 3.0 2.2 SC_2025-05-17_21-41-07 beam back (intensity of SIS injection varies)
2025-05-17 02:36 130 205827 205828 205820 2.4 2.0 SC_2025-05-17_21-41-07
2025-05-17 03:10 131 --- --- --- --- --- SC_2025-05-17_21-41-07 empty file due to medusa crash
2025-05-17 03:10 132 205827 20582X 20582X 2.4 2.2 SC_2025-05-17_21-41-07 Started measurement to late, last step affected
2025-05-17 03:47 133 205827 20582X 20582X 3.0 2.3 SC_2025-05-17_21-41-07
2025-05-17 04:24 134 205827 20582X 20582X 2.5 2.4 SC_2025-05-17_21-41-07
2025-05-17 05:00 135 205827 20582X 20582X 3.9 2.4 SC_2025-05-17_21-41-07
2025-05-17 05:35 136 205827 20582X 20582X 1.5 2.0 SC_2025-05-17_21-41-07
2025-05-17 06:10 137 205827 20582X 20582X 3.6 2.4 SC_2025-05-17_21-41-07
2025-05-17 06:46 138 205827 20582X 20582X 3.2 2.9 SC_2025-05-17_21-41-07
2025-05-17 07:22 139 205827 20582X 20582X 3.6 1.8 SC_2025-05-17_21-41-07 Closed NTCAP file, Nightshift over and out
  88   Sun May 18 01:47:56 2025 KonstantinDAQParticle detector
The attachment shows the signal of the particle detector for bunched beam (red, files 104-112) coasting beam (black, files 113-117) as a function of the time for one cycle of the DRALS pattern. One can identify modulations of the signal during the cooling step in both traces. However, there are some clear differences:
  • Oscillation in bunched beam operation (maybe due to RF and cooler voltage offset?)
  • While in coasting beam mode a steady state is reached, this is not observed in bunched beam operation.
  89   Sun May 18 02:24:46 2025 Wilfried, Rodolfo, CarstenDetectorsAntrieb Cu-Mirror defekt
On Saturday afternoon we moved the Cu mirror to the inner position, however an issue appeared when we tried to move the mirror to the "park" position. The stepping motor did not react properly, it clamped. After restarting the software we could actually move the mirror out, but the stepping motor as well as driving system made a lot of noise until the parking position was reached. This issue has to be investigated specialists after the beamtime.
  90   Sun May 18 04:33:46 2025 Dimitrios, Finn, KonstantinLaserLaser position
We changed the position of the laser back to the position which was set up in E 85 by changing the motor position of motor 4 in the kangoo software at ATPPC031 from -0.1 to -0.3.
  91   Sun May 18 08:06:55 2025 Danyal, Christopher, JonasRunsmorning shift
Took over from night shift and keep scanning
Time File Ohmlabs PTB 32 PTB 33 ESR intensity SC8 / 1e6 Typical SIS injections / 1e9 NTCAP file comments
2025-05-18 08:21 140 205821 205827 205828 2.4 1.6 SC_2025-05-18_07-57-22 morning shift starts
2025-05-18 08:57 141 205821 205828 205829 3.3 1.4 SC_2025-05-18_07-57-22
2025-05-18 09:32 142 205821 205828 205829 2.5 1.7 SC_2025-05-18_07-57-22
2025-05-18 10:08 143 205821 205828 205829 1.3 2.0 SC_2025-05-18_07-57-22 strong drop in ESR intensity after injection
2025-05-18 10:43 144 205822 205828 205829 3.4 1.8 SC_2025-05-18_07-57-22
2025-05-18 11:19 145 205820 205828 205829 1.1 1.5 SC_2025-05-18_07-57-22 strong drop in ESR intensity after injection (see screenshot), laser scan started a few seconds too late
2025-05-18 11:55 146 205822 205828 205829 0.9 1.5 SC_2025-05-18_07-57-22 strong drop in ESR intensity after injection, worse than before, decreasing SIS intensity
2025-05-18 12:00 called HKR, reported ESR drop, they checked but see no clear reason, ESR crew will be called for help, see 2nd screenshot
2025-05-18 12:15 Sergey called, we should stop requesting after ESR cycle, then send "ganzen Kontext" (ParamModi) and then request beam again
2025-05-18 12:29 147 205822 205828 205829 0.4 1.0 SC_2025-05-18_07-57-22 again drop in ESR intensity after injection, SIS18 intensity was increased during accumulation
2025-05-18 12:40 we sent "ganzen Kontext" (ParamModi) and then request beam again
2025-05-18 13:04 148 205821 205828 205829 1.3 2.5 SC_2025-05-18_07-57-22 looks better now
2025-05-18 13:15 stopped ESR cycle, stopped NTCAP, Sergey will check ESR settings, maybe improvement is possible
2025-05-18 13:45 ESR cycle running but was interrupted, DRALS was still running, we waited until DRALS end, then started ESR cycle again. We changed time between SIS18 injections from 40 s to 20 s
2025-05-18 14:14 149 205826 205833 205834 5.7 3.5 SC_2025-05-18_13-52-38 the losses after injection (in SC5) are gone!! (see 3rd screenshot) HV values slightly drifted, ~5 V
2025-05-18 14:49 150 205819 205826 205827 2.6 2.5 SC_2025-05-18_13-52-38 slight SC5 losses again, and HV values again slightly drifted, ~3 V
2025-05-18 15:24 151 205821 205828 205829 1.8 2.3 SC_2025-05-18_13-52-38 slight SC5 losses again, HV values back to normal
2025-05-18 16:00 152 205824 205831 205832 0.7 2.6 SC_2025-05-18_13-52-38 low ESR intensity, HV slightly different
  92   Sun May 18 16:08:58 2025 Wilfried, Carsten, Rodolfo, HendrikRunsAfternoon shift, continued measurements
Took over from morning shift and keep scanning
Time File Ohmlabs PTB 32 PTB 33 ESR intensity SC8 / 1e6 Typical SIS injections / 1e9 NTCAP file comments
2025-05-18 16:35 153 205821 205827 205817 0.8 2.3 SC_2025-05-18_13-52-38 Inconsistent SIS Injections, Voltages all drifted slightly, checked the beam positions by moving the scraper on the remaining ions after scan, Scraper GECEDS2HU was used and the horizontal alignment was confirmed to still be good, Carsten re-sent some SIS commands but changed nothing
2025-05-18 17:38 154 205822 205828 205829 0.7 2.0 SC_2025-05-18_13-52-38 Unlucky SIS injections, Voltages do not drift much anymore, beam after scan was used to scrape again, checked vertical alignment with GECEDS1VU, ion beam located at -0.5, laser beam still clearly visible, around 4mm too high compared to ion beam, GECEDS1HU confirms horizontal alignment is also good like in Scraper 2
2025-05-18 18:43 155 205824 205830 205831 0.9 2.5 SC_2025-05-18_13-52-38 GECEDS1HU destroyed ion beam at -13.0
2025-05-18 19:32 156 205822 205829 205830 0.8 3.0 SC_2025-05-18_13-52-38 First few SIS injections were very bad, after that very good, 0.5 on GECEDS2VU and the ion beam vanishes, fits good with laser beam, delay of the laser reduced by 7ns
2025-05-18 20:21 157 205822 205828 205830 0.8 2.4 SC_2025-05-18_13-52-38
2025-05-18 20:57 158 205822 205828 205830 0.7 2.5 SC_2025-05-18_13-52-38
2025-05-18 21:38 159 205820 205826 205828 1.3 2.8 SC_2025-05-18_13-52-38
2025-05-18 22:13 160 205820 205826 205827 1.0 2.8 SC_2025-05-18_13-52-38
2025-05-18 22:46 161 205820 205826 205827 1.7 2.9 SC_2025-05-18_13-52-38
2025-05-18 23:22 162 205822 205829 205830 3.5 2.7 SC_2025-05-18_13-52-38 While scanning, at step 16 something weird happened and the accumulated counts decreased only in that step
2025-05-18 00:00 163 205822 205828 205829 5.0 2.8 SC_2025-05-18_13-52-38 22 injections and 75 breeding cycles


Timing: We shifted the laser approximately 8 ns to an earlier time to compensate for the 2-3 m distance between the target and the detection region (please note that earlier times are located to the right since the x-axis is the time after the event until the common stop). The positions of the laser pulse on the photodiodes are therefore shifted to the right.
  93   Sun May 18 21:30:20 2025 Wilfried, Rodolfo, Markus, ZoranAcceleratorT-Scrapers, Update
Here are the right instructions to drive the T-Scrapers inside the ESR Electron Cooler

  • ECEDS1VU: Verriegelt mit ECEDS1HA. Der Antrieb kann nur fahren
    wenn der Antrieb ECEDS1HA in Position -4,0 steht.

  • ECEDS1HA: Verriegelt mit ECEDS1VU. Der Antrieb kann nur fahren
    wenn der Antrieb ECEDS1VU in Stellung EI steht.

  • ECEDS2VU: Verriegelt mit ECEDS2HA. Der Antrieb kann nur fahren
    wenn der Antrieb ECEDS2HA in Position 0,0 steht.

  • ECEDS2HA: Verriegelt mit ECEDS2VU. Der Antrieb kann nur fahren
    wenn der Antrieb ECEDS2VU in Stellung EI steht.

According to Boywitt/Schuhmacher, BEA-MEI. Date: 28.07.2021
  94   Mon May 19 00:28:40 2025 Simon, FinnRunsNight shift measurement
Took over from afternoon shift and keep scanning
Time File Ohmlabs PTB 32 PTB 33 ESR intensity SC8 / 1e6 Typical SIS injections / 1e9 NTCAP file comments
2025-05-19 00:20 164 205822 205828 205829 3.8 1.5 SC_2025-05-18_13-52-38 week injections from SIS
2025-05-19 00:50 165 205822 205828 205829 5.0 2.6 SC_2025-05-18_13-52-38
2025-05-19 01:23 166 205822 205828 205829 5.3 5.3 SC_2025-05-18_13-52-38 file empty: medusa crashed
2025-05-19 01:23 167 ? ? ? --- --- SC_2025-05-18_13-52-38 problem with normalization in Go4: cleaned histograms
2025-05-19 02:00 168 ? ? ? 0.5 2.6 SC_2025-05-18_13-52-38 bad injections/stacking
2025-05-19 02:37 171 ? ? ? 4.5 2.8 SC_2025-05-18_13-52-38 mbs crashed due to overfull buffer, restarted mbs
2025-05-19 03:36 173 ? ? ? 5.5 2.9 SC_2025-05-18_13-52-38
2025-05-19 04:14 174 ? ? ? 5.4 2.9 SC_2025-05-18_13-52-38
2025-05-19 04:50 175 ? ? ? 5.3 2.8 SC_2025-05-18_13-52-38
2025-05-19 05:26 176 ? ? ? 5.4 2.9 SC_2025-05-18_13-52-38
2025-05-19 06:02 177 ? ? ? 0.9 3.1 SC_2025-05-18_13-52-38 great losses after stacking and after breeding
2025-05-19 06:39 178 ? ? ? 5.1 2.9 SC_2025-05-18_13-52-38 we changed the scan range to 592.7 - 592.1nm
2025-05-19 07:15 179 ? ? ? 4.9 2.9 SC_2025-05-18_13-52-38
2025-05-19 07:51 180 ? ? ? 4.9 2.9 SC_2025-05-18_13-52-38 medusa crashed again
2025-05-19 08:27 181 ? ? ? 4.9 2.8 SC_2025-05-18_13-52-38


After file 168 we noticed that the connection between mbs and medusa looked faulty, so we restarted mbs and restored the connection. But we could not get the voltage divider readout back running.
Files 166,168-172 are empty/incomplete.

After file 177 we saw a peak at the predicted wavelength in the histogram with subtracted background. To confirm this, we changed the scan range to 592.7 - 592.1nm, which should move the peak to the left of the histogram.
  95   Tue May 27 10:56:44 2025 KonstantinDAQCommon stop
The common stop was wired through a 1:2, and subsequently through a 1:99 rate divider channel. However, since the pulse width was too long, the 1:2 channel was translated into a 1:4 reduction. This must be considered, when the data is processed via go4. The reduction factor in the SetParameters.C file must be set to 198 accordingly.
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