 Sat May 10 00:52:21 2025, Finn, Simon, Konstantin, Rodolfo, DAQ, Bunching - ammendment late shift
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Some 209Bi80+ beam was provided for tests measurement over the weekend. Currently the beam is bunched at the second harmonic, corresponding to a bunching
frequency of [B]3.87421MHz[/B] and a revolution frequency of [B]1.937105MHz[/B]. The setting of the rate dividers were 2 and 99. Two is important since
we are working with the second harmonic, and 99 provides approximately 20kHz, which is expected by the DAQ. The measurement of the frequency was performed |
Sat May 10 03:32:18 2025, Finn, Simon, General, Beam not bunched (?) 
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We think the beam in the ESR is not bunched. There is a clear difference in PMT signal if ions are in the ESR compared to no ions (see screenshot of scaler
PMT mid, high level with ions, low level without) but we see no structure of an ion bunch (see screenshot of accumulated bins).
We also increased the accumulation to 10 injections, still no bunch visible.
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Sat May 10 03:46:57 2025, Finn, Simon, Detectors, PMT north
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In contrast to PMT Mid, the difference between ions and no ions in the ESR (see screenshot scaler) is not visible. Signal gets higher with injection and
shows some kind of exponential decay afterwards.
Beam was dumped at 500 and 1200s. Even after the dump, the signal steadily drops.
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Sat May 10 03:54:46 2025, Finn, Simon, Carsten , General, Night shift sum up - ammendment day shift
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As the beam in the ESR is most probably not bunched, there was not much we could do. During the night shift we:
- adjusted the threshold of the PMTs mid and north with beam in the ring
- found that the delay generator for PMT mid is broken, so the timing is off and needs to be remeasured
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Sat May 10 12:58:54 2025, Carsten, Detectors, Scrapers do not work reliably / Scraper positions for further tests
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I tried scraping with pressurized-air devices in order to verify the beam poistion. All 4 devices that we use do not work reliable (at least when driven
"manually" via Device Control).
1) Sometimes they do not reach the set position
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Sat May 10 17:05:24 2025, Konstantin, Detectors, XUV detector and copper mirror control
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I attach the manual of the XUV and copper mirror control software, which is hosted at the Raspberry Pi (140.181.91.15) below the optical detection region
at ESR. The Motor position of the stepper motor is at 0mm, which corresponds to the outer park position. |
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Sat May 10 17:47:50 2025, Carsten, Wilfried, Accelerator, Drifttube Cooling works
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The cooling ith a tentative DRALS pattern works well.
Cooling voltage in SC8 is now 905 V higher:
ESR manipulations -> Cooler maniuplations -> GECEBG1E is changed from +150V to +1055V. Please note the sign conventions. This means that the electrons |
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Sat May 10 20:14:47 2025, Rodolfo, Wilfried, Carsten, General, Lights in ESR
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The light (Beleuchtung) inside the Cave have been ON since probably yesterday evening (9. May) when Uli was inside the cave for fixing some issues.
We have now turned off the light.
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Sat May 10 20:53:17 2025, Rodolfo, Konstantin, Accelerator, Reading of E-Cooler Voltage
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We do not have the reading of the electron cooler voltage. According to Grafana the reading of the voltage stopped at 11:53:00, when the voltage was 205070
V.
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Sat May 10 22:47:29 2025, Konstantin, DAQ, HV Divider
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The readout of the hv dividers is running again. In order to restart the acquisition if it has crashed, connect to the raspberry pi and restart the analysis.
Therefore, use the following procedure (Optional steps are indicated with [B](*)[/B]):
[LIST]
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Sat May 10 23:30:37 2025, Rodolfo, Accelerator, Ion Pumps at the target section
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The ion pumps (E02VP16i and E02VP17i) which nearby the optical detection region produce high count rate into the photomultipiers. Therefore they were turned
off on May 5th by our colleague from UHV (Herr Mia). He checked the vacuum before (EIN) and after (AUS) turning off the pumps. |
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Sun May 11 03:10:41 2025, Konstantin, Simon, Detectors, Bunched beam on PMT
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We checked again the time-resolved signal on the PMTs and after several minutes of accumulation we saw a the bunch shapes on PMT mid (att. 1 right) and
also a tiny indication on PMT north (att. 1 left).
On the particle detector, the bunches are clearly visible (att. 2).
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Sun May 11 03:23:18 2025, Simon, Konstantin, Calibration, Delaytime measurement
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We performed another set of delay time measurements to substitude the broken channel of PMT middle. We did this in two step:
1.) Measurement of the total delay between the origin of a signal (AFG 10kHz, -50mV amplitude) and the detection directly before the DAQ after traveling |
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Sun May 11 05:16:22 2025, Konstantin, Simon, Accelerator, Breeding of Lithium
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We measured the breeding efficiency of Li-like ions in the ESR and the rates are way below the expected 25%.
[TABLE border="1"]
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Sun May 11 05:25:07 2025, Simon, Konstantin, General, Detector drives
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Currently, the particle detectors show a weird behavior. Sometimes they drive too far. [B]IMPORTANT: As long as it is unclear what is the reason for this,
only ask for a new injection with the BSS Control once it is checked that the devices [COLOR=red]GE02DD2[/COLOR], [COLOR=red]GE02DS3HG[/COLOR], [COLOR=red]GE01DD2IG[/COLOR],
and [COLOR=red]GE01DS3HG[/COLOR] are at their outer end positions. [/B]
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Sun May 11 15:42:18 2025, Carsten, General, Particle detector / dielectronic recombination measurements
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The DR setup was put into operation yesterday and first spectra recorded (see below).
Particle detector behind cooler ("SA_SZ") presently has voltage of 1350. The threshold at the CAEN CFD was set to 100 and changed to 150 today. There is
a huge gap between noise and signal, however, today it seemed in DR that we had a burst of higher pulses.
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Sun May 11 17:30:24 2025, Carsten, Rodolfo, Jonas, General, Accidentally Skipped Breeding Step in File 0012.LMD
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| At ~17:26:30 the beam process was accidentally set to not wait on breeding, affecting the data in file 0012.LMD |
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Sun May 11 20:08:37 2025, Carsten, Runs, DR runs with DC beam
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We have 4 valid DR files for DR with unbunched beam. Iel = 500mA
run_0011.lmd
run_0012.lmd
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Sun May 11 23:16:14 2025, Carsten, Runs, Switched back to bunching beam
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At about 22:30 we switched back to the bunched beam.
The new NTCAP directory is IQ_2025-05-11_22-37-04, started NTCAP Schottky data.
Same ramp as before 24 eV to 4 eV. 1001 steps dE = 0.02 eV,
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Mon May 12 07:19:16 2025, Finn, Simon, Konstantin, DAQ, DR Measurements
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During this night we recorded several DR measurements. Before the DR, we charged bread for about 10 minutes.
1. We took over at 0:00 with file no.16 (started 22:15)
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