 Wed Jun 18 00:33:56 2025, Esther, Alexis, Anton, Rodolfo, Carsten, DAQ, R4l-41
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We have some issues with the RIO computer R4l-41 (DAQ1). We had to switch off completely twice. Only then it reacted properly. Maybe a problem with the
network at about 00:00 o'clock? |
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Fri Jun 20 06:37:51 2025, Konstantin, Accelerator, Position of contaminants
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I checked the positions of the contaminants. Therefore, I drove the scrapers and observed the signal at the Schottky detector
While the vertical positions are identical for all scrapers, the horizontal positions deviate due to the dispersion in the cooler section
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Wed Jun 18 07:59:00 2025, Julien, Konstantin, Laser, Phase-offset 
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We recognized that the output power of the pump laser was instable when externally triggered with 200kHz (stand-bye frequency of ESR). Therefore, we changed
the coarse timing offset of the pockels cell trigger compared to the flash lamp pulse from 215µs to 219.9µs.
Thereby, the output power increased from ~600mJ to 620mJ, and the PTP stability improved from 15% to 10%. The RMS stability improved from 2% to 1.2 %. |
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Tue Jun 24 15:44:06 2025, Konstantin, DAQ, Phase shift in DAQ1
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In the SetParameters.C file is a parameter called fPar->piPhaseOffset. It was shifted from 100 to 50 in order to see ion bunches in the pmt signal and laser
pulses in the photodiode signal during the same revolution in the TDC spectrum. Note that this parameter must be taken
into account when setting the window conditions of the arrival time in the SetConditions.C file. |
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Sat Jun 21 03:13:02 2025, Alex, Anton, Rodolfo, Hiroshi, Detectors, Part Det South
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Bunch signal on Particle Detector South. On the
[LIST]
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Sat Jun 21 22:33:04 2025, Peter , Danyal, Detectors, PMTs are switched off
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| We have switched off all 3 PMTs ! |
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Thu Jun 26 18:13:17 2025, Jan, Carsten, Detectors, PMT voltages & thresholds
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current settings of PMT voltages and thresholds at the CAEN CFD:
PMT South [HV ch2: 2700V] [CFD ch0: 8]
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Mon Jun 23 18:36:39 2025, Wilfried, Simon, Detectors, PMT test with LED
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We tested the PMTs again, this time with an UV LED that is mounted at a window close to the XUV detector.
PMT south showed a very clear increase in count rate from about 1 to 50 Hz.
PMT mid also showed a small increase by a few Hz.
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Sat Jun 21 18:00:49 2025, Carsten, Peter, Danyal, Kristian, Marek , Detectors, PMT signals
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Carsten and Kristian changed (18:00) the thresholds of PMT north and PMT middle in the ESR cave.
See picture below. The effect is negligible.
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Sat Jun 21 21:55:18 2025, Peter, Danyal, Marek, Detectors, PMT rates
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We have made two foam rings (outer diameter ca. 70 mm with a thickness of 10 mm each and placed them successively underneath PMT north.
ring 1: ID = 55 mm
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Sat Jun 21 17:00:10 2025, Carsten, Peter, Danyal, Kristian, Marek, Detectors, PMT north exchanged
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We noted that the dark countrate of PMT north is about 20x higher than that of PMT middle.
We went into the ESR cave to look for stray light.
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 Wed Jun 4 16:18:57 2025, Rodolfo, Simon, Detectors, PMT dark count rates
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I adjusted the offsets of the amplifiers in the cave and measured the dark count rates :
[TABLE border="1"]
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Tue Jun 24 12:25:34 2025, Carsten, Detectors, PMT behaviour - noise / PMT voltages / CFD Threshholds / CAEN Power supply (broken channel resetted)
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In position North there is still the "old" 9423B PMT that draws quite some current.
On this detector threre is also some quite substantial noise. Very likely the base is not ok any more. Noise was much lesss for the other two PMTs.
Since position NORTH is the position with the largest sold angle, if there is another break from the accelerator we should exchange it against SOUTH.
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Tue Jun 24 17:39:13 2025, Carsten, Stefan, Simon, Rima, Nils, Detectors, PMT behaviour - noise / PMT voltages / CFD Threshholds / CAEN Power supply (broken channel resetted)
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PMT North and South have been changed:
CFD CH0: Middle Thr 7 / CAEN HV Ch1: 2750 V
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Tue May 20 16:14:30 2025, Rodolfo, Simon, Detectors, PMT arrangement at ESR
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This is the arrangement of the photomultipiers at the optical detection region at ESR for Thorium 2025
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Sun Jun 22 18:47:23 2025, Carsten, Peter, Marek, Simon, DAQ, PMT and particle detector settings
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Final voltages and thresholds for the PMTs and particle detectors before the first scan:
[TABLE border="1"]
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Wed Jun 18 19:05:28 2025, Carlo, Zac, Shahab, Ragan, Analysis, PID with rionid
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For PID with rionid we used:
- LISE file from last year (attached.
- .npz file from 410 RSA (attached). |
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Sun Jun 29 15:53:45 2025, Carsten, Simon, Accelerator, No scans possible
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15:45 Right now, we are waiting for stable conditions again. There are problems with both the ion source and the accumulation in SIS.
16:20 SIS and source look better now, but now ESR makes trouble. The stacking looks off and after deceleration and cooling barely any Th-ions are stored. |
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Wed Jun 18 01:58:02 2025, Esther, Alexis, Anton, Rodolfo, Carsten, Accelerator, No Bunched Beam
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| The Bunching is not set properly. We do not see the ion bunch with the Photomultiplier. |
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Wed Jun 4 16:17:47 2025, Simon, Detectors, Nitrogen
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| The nitrogen supply for the PMTs is turned [B]ON[/B]. |