ID |
Date |
Author |
Category |
Subject |
50
|
Fri May 14 08:55:53 2021 |
Sebastian | General | ToDO 14.5 ...so far |
1.) ion lasser overlap and scraper test
2.) change bunching frequency to middle of ecooled coasting beam
3.) long time measurements see labbook HKR
3.1) try ecooler on/off ; bunch on / off ; laser fixed on / off ; laser scanning on / off ; try different bunching amplitudes (MAX :LEV 0.25V) ; try other h = 10, 7, etc...
3.2) Dont forget to plug in the schottky trigger -> maybe change acquisition and analysis time if needed
4.) XUV detector tests
4.1.) laser - bunch timing by checking xuv anode signal |
51
|
Fri May 14 09:00:55 2021 |
Sebastian | General | UNILAC Problems |
~30 min downtime
--> LASER ADJUSTEMENTS! |
70
|
Sun May 16 02:18:53 2021 |
Sebastian | General | UV Drop |
1:25 a.m. huge drop in UV laser power
-> small crystal bump with both y screws of bbo oven |
19
|
Wed May 12 10:15:47 2021 |
Volker Hannen | DAQ | Unplugged TDC inputs for MCP front and back |
To reduce the load on the VUPROM TDC, we unplugged the TDC inputs for the front and back signals of the MCP of the XUV detector.
The Anode signal is still plugged in and should be sufficient for the analysis. |
28
|
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 |
39
|
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 |
42
|
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. |
Attachment 1: Schottky1.jpeg
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Attachment 2: Schottky2.jpeg
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Attachment 3: Schottky3.jpeg
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Attachment 4: Schottky4.jpeg
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85
|
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. |
48
|
Fri May 14 07:20:18 2021 |
Team #Night | General | actual bunching frequency |
25,82556 MHz
h = 20 |
61
|
Sat May 15 03:39:16 2021 |
Team | General | actual revolution frequency |
frev = 1,2912735 MHz |
6
|
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 :( |
31
|
Thu May 13 01:01:27 2021 |
Danyal | DAQ | bunched ion beam |
|
Attachment 1: bunched_-_signal.jpg
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Attachment 2: bunched_-_Schottky.jpg
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Attachment 3: zoom_bunched_-_Schottky.jpg
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Draft
|
Fri May 14 07:33:42 2021 |
Team #Night | General | ecooler central frequency shifted relative to bunch central frequency |
|
5
|
Tue May 11 18:29:35 2021 |
Danyal | General | first ions in the ESR |
|
Attachment 1: first_ions_are_injected.jpg
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11
|
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. |
Attachment 1: Screenshot_(154).png
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25
|
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 |
21
|
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. |
8
|
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. |
Attachment 1: fluctuations.jpg
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10
|
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. |
32
|
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. |