 Thu May 13 00:58:53 2021, Danyal, DAQ, unbunched ion beam 
|
|
|
Fri May 14 01:34:44 2021, Team, General, strange XUV Anode signal
|
We see a strange behavior of the anode signal when we bunch the ion beam and electron cooler is on.
peak structure... ---> we play now with the bunching amplitude
200mV
150mV
100mV ---> Peaks higher?
see attached file |
|
Wed May 12 13:11:58 2021, Danyal, Accelerator, short break between 13:30 and 15:30
|
There will be a short break (2 hours) this afternoon. Between 13:30 and 15:30.
The so-calles "super lense" in the UNILAC needs to be cleaned (rinsed).
After that operation should continue as usual. |
|
Tue May 11 15:49:30 2021, Danyal, General, setting up ESR
|
The operators are still busy extracting the beam from the SIS18 towards the ESR and injecting it into the ESR. |
|
Thu May 13 01:05:45 2021, Danyal, DAQ, more stability by bunching
|
Because the C3+ part of the ion beam is properly bunched, it is no longer so sensitive to the drifts caused by the e-cooler.
In the O4+ part of the ion beam these drifts can still be seen. |
|
Wed May 12 02:34:29 2021, Danyal, General, instabilities in ion frequency
|
The ion beam moves around, pretty arbitrary. See picture.
ESR crew believes that it is not due to fluctuations in the HV of the E-Cooler. |
 Wed May 12 08:10:17 2021, Lars, General, instabilities in ion frequency
|
looks like the E-Cooler is responsible for this. If one turns off the electron current, the beam stays stable.
M.Steck is informed.
> The ion beam moves around, pretty arbitrary. See picture.
> ESR crew believes that it is not due to fluctuations in the HV of the E-Cooler. |
|
Wed May 12 15:36:04 2021, Danyal, Accelerator, general power failure in ESR! (everything is off)
|
The power in the ESR is off.
(also on the gas-target area on top of ESR)
Electrical engineers are trying to find and fix the problem. |
|
Wed May 12 22:35:33 2021, Danyal, General, frev and fb
|
Schottky frequency (189th harmonic) = 244.033662 MHz
revolution frequency frev = 1.2911834 MHz
bunching frequency h=2 --> fb = 2.582367 MHz
bunching frequency h=10 --> fb = 12.911834 MHz |
|
Wed May 12 08:32:04 2021, Sebastian, Analysis, fluorescence & energetic overlap
|
During the night shift we saw several rises of the fluorescence (see another entry) and also energetic overlap in coasting beam modus.
Here the laser wavelength was stabilized @ 1028,967nm and electron cooler was switched off because of some fluctuations which we saw in the schottky.
Left part of the schottky picture shows the c3+ beam, the right part is the o4+ contamination. |
|
Tue May 11 18:29:35 2021, Danyal, General, first ions in the ESR
|
|
|
Fri May 14 07:33:42 2021, Team #Night, General, ecooler central frequency shifted relative to bunch central frequency
|
|
|
Thu May 13 01:01:27 2021, Danyal, DAQ, bunched ion beam
|
|
|
Tue May 11 20:14:43 2021, Danyal, General, bad ESR vacuum
|
I just heard that the ESR vacuum is quite bad.
There was a small vacuum problem a while ago, it was sealed, but apparently the pressure is not as low as usual.
Markus Steck said that the beam lifetime is only 15 - 20 seconds !!!
This will seriously complicate some of our test experiments :( |
|
Sat May 15 03:39:16 2021, Team, General, actual revolution frequency
|
frev = 1,2912735 MHz |
|
Fri May 14 07:20:18 2021, Team #Night, General, actual bunching frequency
|
25,82556 MHz
h = 20 |
|
Tue May 31 07:29:11 2022, Ken, Detectors, XUV-Detektor
|
Rate was very low: ~ 100Hz
Adjusted Walk level and Threshold, new rate: 5kHz
Additionally, parameters of the detector were varied for optimization but were returned to default afterwards. |
|
Thu May 13 23:42:37 2021, Ken Ueberholz, General, What was done
|
In this shift a number of successful Schottky measurements were done:
With fixed laser wavelength, while varying the wavelength, with different bunching and more (see logfile 1 for more info: line 53 to at least 107).
The detector software sometimes files to change the current of the power supplies, if this happens a simple restart of the GUI fixes the problem.
Once in this shift the Mesytek in the laser lab turned itself (?) off and the background rate increased. Hopefully this was a single event. |
|
Thu May 13 18:34:54 2021, Ken Ueberholz, General, What happened scince shift change at 4pm
|
Ion frequency shifts with laser, both manually and scanned, without bunches: successful
Bunching with 7 and 20 bunches: successful
Tried laser scans with bunches: unsuccessful
Manual laser scans with bunches: successful |
|
Wed May 12 23:36:18 2021, Ken Ueberholz, DAQ, VI change
|
carbon main vi - kopie is now in operation
here, in keysight.vi the input settings for the new impedence for the multimeter are now hopefully correct --> THIS SHOULD BE CHECKED IF THE RING IS OPEN |