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  nuclear two-photon decay, Page 4 of 12  Not logged in ELOG logo
ID Date Author Category Subjectdown
  18   Thu May 6 21:45:30 2021 HelmutDetectorsbeam position on TE5 grids
The two grids do not work very well, one x position is opposite to the other.
But at least a guidance for the future, this was good injection of 78Kr with a thick Be target.
Attachment 1: 2021-05-06_21-32-36-171.png
2021-05-06_21-32-36-171.png
  76   Sat May 8 16:08:58 2021 Helmut WeickAcceleratorbeam position of Kr before ESR
Checked beam positions in beamline before ESR,
they all look the same as before, with direct Kr beam.
Compare with old elog entry #.
Also on Leuchttarget it is in the center like before.
Attachment 1: TE3DG3-Kr.JPG
TE3DG3-Kr.JPG
Attachment 2: TE3DGC-Kr.JPG
TE3DGC-Kr.JPG
Attachment 3: TE5-grids-Kr.jpg
TE5-grids-Kr.jpg
  145   Wed Jun 30 01:38:20 2021 ShahabRunsbeam is back from Linac but not in the ESR
  58   Fri May 7 20:34:27 2021 Kanika, Michael, ShahabRunsback to 15 sec recording
now we are going back to 15 sec operation. Cave M (bio) operation is over
  167   Thu Jul 1 14:47:15 2021 Yury, HelmutAcceleratoradded high Brho scrapers
So far only scrapers for low Brho were used:
  GE01DS_HI = -58mm (arc from inside) and
  GEEXDS2HA = -11.2 (straight from outside)
We also want a cut on high Brho to avoid possible strange lines.

GE01DS_HA is limited in motion, at the maximum inside position (0.0 mm) there is no effect.

Next EEXDS1HG (aperture for ToF-detctor) in mm
120 -  completely out
 60 - no effect full beam
 45 -   "
 30 -   "
 20 -   "
 10 - very little beam remaining
  5 - gone
 12 - little beam
 14 - narow but little
 16 - narrow with small tail in left side
 20 - again like full
100 - full (as reference for the eye)

Then similar with E02DSHG in arc dipole in mm
 -130 - full
  -60 - full
  -40 - gone
  -45 - very tiny
  -55 - full
  -50 - less beam
  -52 - similar
  -53 - no difference
  -58 - looks like full

Now add EEXDS1HG again with -16mm, no difference, so keep both in.
==> we cut in arc from both sides and on straight secton from both sides
    Intensity does not look different to scrapers out. 
    It looks like a bit less 70Se in ESR then 1h before, but maybe other reason.
Attachment 1: ESR-scraper-overview.jpg
ESR-scraper-overview.jpg
Attachment 2: scrapers-used.JPG
scrapers-used.JPG
  125   Mon May 10 01:34:37 2021 Chris CGeneralZoom screenshot
How things look currently in Zoom-world.
Attachment 1: Zoom_monitoring_2021-10-05_0131CET.PNG
Zoom_monitoring_2021-10-05_0131CET.PNG
  69   Sat May 8 07:34:08 2021 Akash, Nic, Jelena, ZsoltGeneralZoom has its own mind
Zoom kicked us all out... we managed to get back in...screen sharing is back on.
  56   Fri May 7 19:56:10 2021 Kanika, Michael, ShahabRunsZOOM session restart
restart zoom session
  98   Sun May 9 06:15:09 2021 Iris, Chris G., Jacobus, MicheleRunsTriplet: zoom in
Zoom into the triplet: the satellite peaks on the right are clearly visible.
This is just one file but one *might* see some substructure. Yuri mentioned a 318 ms isomer in 45Sc at 12 keV but that cannot be resolved.

Maybe someone can look at the added-up ROOT files if that looks better or is just statistics?

> Short update from Yuri: these are not our isomers. These are 45Sc (left, 12 keV isomer not resolvable) and 75Br (center), and the right-most peak of the triplet is a satellite (has a different line shape, much narrower).
> 
Attachment 1: 116-triplet.png
116-triplet.png
  37   Fri May 7 08:55:33 2021 Ragan, Andrew, YuriGeneralTrigger changed
Trigger for both the spectrum analyzers is changed from 50% to 1% by Yuri.
For this, the ESR pattern was stopped at 08:50 and was started back at 08:53.
Attachment 1: photo_2021-05-07_08-58-58.jpg
photo_2021-05-07_08-58-58.jpg
  35   Fri May 7 07:52:12 2021 Ragan, AndrewGeneralTo change trigger position
Xiangcheng suggested to change the trigger position in order to start the file with the injection. Nothing is changed at the moment. Maybe Shahab or Yuri can do it when they arrive.
  11   Thu May 6 14:30:23 2021 W. KortenGeneralTarget thickness
Thickness of the Carbon target in the TE line has been measured by centering the primary 78Kr beam in the ESR:
Beam energy 370 MeV/u, with thin stripper, ESR energy 368.65 MeV
Adjust beam with "thick" target to keep ESR energy at 368.65 MeV/u -> Beam energy 445 MeV/u
Energy loss 75+1.35=76.35 MeV
Target thickness : 9.97 mm
  9   Thu May 6 13:26:56 2021 Helmut WeickDetectorsTE5 profile grids do not work
There are several issues.

1. The stepper motor drive does not react from Device-Control, -> check controller in FRS Messhütte
2. They don't get a trigger, other grids in TE-line do -> check raw signals also in FRS Messhütte, ask Strahldiagnose
3. For less noise pockets of grids should be evacuated, but most likely the pump is still off or not even connected -> enter ESR and connect

Check also manual at https://web-docs.gsi.de/~weick/frs/current_grids.html
Below picture of no trigger shown in App. Usually it should say last trigger a few seconds ago and display some noise.
Attachment 1: no_trigger.png
no_trigger.png
  224   Sat Jul 3 01:28:08 2021 The remote Canadian eager beavers (Guy and Iris)AnalysisSummed spectra 410 MHz from 21:00-23:59 (70Se)
Here's a picture with all injections with an ion in the spectrum (empty ones were removed- list below). The time slices are 0-0.5-1-1.5-2s, then in 0.2s steps up to 3s. Not really anything to see :-(  The previous shift was right, looking at single spectra might be more useful. I'll group the pictures and upload some "interesting" ones.


Here is the list of spectra btw 21-23:59 which we have removed since they were empty or had just an ion on the far left side:

Name	
410MHz-2021.07.02.22.00.29.051.tiq	
410MHz-2021.07.02.22.02.03.277.tiq	
410MHz-2021.07.02.22.05.11.820.tiq	one line far left
410MHz-2021.07.02.22.10.57.361.tiq	
410MHz-2021.07.02.22.12.00.189.tiq	
410MHz-2021.07.02.22.16.11.439.tiq	possible weak at beginning, up to 2.5s, tbd
410MHz-2021.07.02.22.16.42.837.tiq	
410MHz-2021.07.02.22.17.14.236.tiq	
410MHz-2021.07.02.22.18.17.037.tiq	possible weak at beginning, up to 2.5s, tbd
410MHz-2021.07.02.22.18.48.439.tiq	
410MHz-2021.07.02.22.22.55.403.tiq	
410MHz-2021.07.02.22.23.26.786.tiq	
410MHz-2021.07.02.22.28.48.088.tiq	
410MHz-2021.07.02.22.35.40.568.tiq	
410MHz-2021.07.02.22.36.12.157.tiq	weak on left?
410MHz-2021.07.02.22.36.43.749.tiq	
410MHz-2021.07.02.22.37.15.343.tiq	
410MHz-2021.07.02.22.37.46.933.tiq	
410MHz-2021.07.02.22.45.40.791.tiq	
410MHz-2021.07.02.22.52.31.388.tiq	
410MHz-2021.07.02.22.53.02.969.tiq	
410MHz-2021.07.02.22.56.44.073.tiq	
410MHz-2021.07.02.22.31.59.417.tiq	possible weak at beginning, up to 2.5s, tbd
410MHz-2021.07.02.22.49.21.896.tiq	possible weak at beginning, up to 2.5s, tbd
	
	
410MHz-2021.07.02.21.00.28.254.tiq	
410MHz-2021.07.02.21.04.09.536.tiq	
410MHz-2021.07.02.21.04.41.147.tiq	
410MHz-2021.07.02.21.12.03.629.tiq	
410MHz-2021.07.02.21.14.10.043.tiq	
410MHz-2021.07.02.21.16.16.423.tiq	
410MHz-2021.07.02.21.16.48.033.tiq	
410MHz-2021.07.02.21.17.19.643.tiq	
410MHz-2021.07.02.21.17.51.252.tiq	
410MHz-2021.07.02.21.19.57.661.tiq	
410MHz-2021.07.02.21.20.29.255.tiq	
410MHz-2021.07.02.21.23.07.234.tiq	
410MHz-2021.07.02.21.26.48.358.tiq	
410MHz-2021.07.02.21.28.23.122.tiq	only peak on left
410MHz-2021.07.02.21.29.57.884.tiq	
410MHz-2021.07.02.21.30.29.475.tiq	
410MHz-2021.07.02.21.34.42.242.tiq	
410MHz-2021.07.02.21.43.39.320.tiq	
410MHz-2021.07.02.21.44.42.497.tiq	
410MHz-2021.07.02.21.46.48.867.tiq	
410MHz-2021.07.02.21.47.20.469.tiq	
410MHz-2021.07.02.21.49.58.434.tiq	maybe something on the left
410MHz-2021.07.02.21.51.33.210.tiq	
410MHz-2021.07.02.21.53.07.993.tiq	
410MHz-2021.07.02.21.53.39.589.tiq	only peak on left
410MHz-2021.07.02.21.54.12.383.tiq	
410MHz-2021.07.02.21.56.17.947.tiq	
410MHz-2021.07.02.21.57.52.120.tiq	
410MHz-2021.07.02.21.59.57.662.tiq	
	
	
410MHz-2021.07.02.23.04.07.211.tiq	
410MHz-2021.07.02.23.06.45.360.tiq	
410MHz-2021.07.02.23.07.16.983.tiq	
410MHz-2021.07.02.23.13.04.692.tiq	
410MHz-2021.07.02.23.14.07.894.tiq	
410MHz-2021.07.02.23.20.26.941.tiq	possible line at beginning
410MHz-2021.07.02.23.22.33.289.tiq	
410MHz-2021.07.02.23.24.39.645.tiq	possible line at beginning
410MHz-2021.07.02.23.25.42.835.tiq	
410MHz-2021.07.02.23.27.17.623.tiq	
410MHz-2021.07.02.23.27.49.229.tiq	
410MHz-2021.07.02.23.28.20.832.tiq	
410MHz-2021.07.02.23.28.52.428.tiq	
410MHz-2021.07.02.23.29.24.021.tiq	
410MHz-2021.07.02.23.29.55.608.tiq	
410MHz-2021.07.02.23.33.36.787.tiq	
410MHz-2021.07.02.23.35.11.557.tiq	
410MHz-2021.07.02.23.37.17.912.tiq	weak line at beginning
410MHz-2021.07.02.23.42.02.249.tiq	
410MHz-2021.07.02.23.46.46.400.tiq	weak line on the left
410MHz-2021.07.02.23.47.17.981.tiq	
410MHz-2021.07.02.23.48.21.143.tiq	
410MHz-2021.07.02.23.48.52.727.tiq	
410MHz-2021.07.02.23.53.36.878.tiq	
410MHz-2021.07.02.23.55.43.122.tiq	
410MHz-2021.07.02.23.56.14.685.tiq	
410MHz-2021.07.02.23.59.55.607.tiq	
Attachment 1: July2-21-0h-410MHz_AllSpectra_70Se.png
July2-21-0h-410MHz_AllSpectra_70Se.png
  227   Sat Jul 3 03:41:48 2021 The remote Canadian eager beavers (Guy & Iris)AnalysisSummed Spectra Summary
To summarise the method of bulk summing the spectra, I've created frequency vs time spectra by using the e143_analyser.py script to stack a series of -s slices. I applied it to some of last runs data with 72Ge, to the 72Br data, last night's less-scraped 70Se, and tonight's more-scraped 70Se, respectively.

A few comments: the 72Ge isomer trail is obvious, but I would never have found it in this total sum if I didn't know where to look. I had to turn up the contrast a lot before it was visible. The 72Br isomer is less obvious than in the single particle tracks, but it too is obvious. You can see that the peak is wider to left at the injection, and 
then narrows out as the isomer decays. This is what we would see if the two peak weren't well resolved.
With that in mind, the 70Se data is challenging. We've established the broad peak is not the isomer as it is not present in the 245MHz detector., and the many single lines seen in the well-scraped data correspond in frequency exactly to this broad band. The 70Se peak doesn't get broader at the base at injection like 72Br, and there isn't any 
line visible in the sum in between. I was nervous that the contrast might be the problem like with 72Ge, but I turned up the contrast on the less-scraped data, but no signal emerged.

So I conclude that if the 70Se isomer is to be found, it needs to be done on a shot-by-shot basis with comparison to the sum to see if it matches the intruder broad peak.
Attachment 1: 72Ge_sum.png
72Ge_sum.png
Attachment 2: 72Br_sum.png
72Br_sum.png
Attachment 3: 70Se_not-scraped.png
70Se_not-scraped.png
Attachment 4: 70Se_strong-scraped.png
70Se_strong-scraped.png
Attachment 5: 70Se_not-scraped_high_contrast.png
70Se_not-scraped_high_contrast.png
  199   Fri Jul 2 06:33:48 2021 The remote Canadian beavers (Iris and Guy)AnalysisSummary of spectra 4:00-6:00 (410 MHz)
Same as before for 4-5h and 5-6h.
No isomer, I think :-( (Sorry, Wolfram!)

> Same as before for 0-4h on July 2nd.
> 
> > Same as before, for 0-1h on July 2nd
> > 
> > 
> > > The last hour before the gas bottle change is summarized here. 
> > > The first pic shows the 410 MHz spectra taken from 22-23h on the 410 MHz analyzer, in time slices of 0.1 sec from 0s-2s.
> > > The second pic shows the spectra in 20ms slices from 1s-1.16s.
> > > 
> > > python3 e143_analyzer.py -s 1.0 -t 0.02 /home/dillmann/.../sparc-daq-02.gsi.de/E143-410MHz/410MHz-2021.07.01.22*
> > > 
> > > The third spectra was taken in May, for comparison.
> > > 
> > > I don't think we see anything...
Attachment 1: July2-4-6h-410MHz_Spectra_0.02s_steps_start_1s.png
July2-4-6h-410MHz_Spectra_0.02s_steps_start_1s.png
  190   Fri Jul 2 01:34:03 2021 The remote Canadian beavers (Iris, Guy)AnalysisSummary of spectra 22:00-23:00
The last hour before the gas bottle change is summarized here. 
The first pic shows the 410 MHz spectra taken from 22-23h on the 410 MHz analyzer, in time slices of 0.1 sec from 0s-2s.
The second pic shows the spectra in 20ms slices from 1s-1.16s.

python3 e143_analyzer.py -s 1.0 -t 0.02 /home/dillmann/.../sparc-daq-02.gsi.de/E143-410MHz/410MHz-2021.07.01.22*

The third spectra was taken in May, for comparison.

I don't think we see anything...
Attachment 1: July1-22-23h-410MHz_Spectra_0.1s_steps.png
July1-22-23h-410MHz_Spectra_0.1s_steps.png
Attachment 2: July1-22-23h-410MHz_Spectra_0.02s_steps_start_1s.png
July1-22-23h-410MHz_Spectra_0.02s_steps_start_1s.png
Attachment 3: Sum_410MHz_May10-1-2am_5_0-5_175s.png
Sum_410MHz_May10-1-2am_5_0-5_175s.png
  201   Fri Jul 2 06:52:11 2021 The remote Canadian eager beavers (Iris and Guy)AnalysisSummary of spectra 0:00-6:00 (410 MHz)
Same as before but for 0-6h, 25ms time slices starting at 1.04s.

> Same as before for 4-5h and 5-6h.
> No isomer, I think :-( (Sorry, Wolfram!)
> 
> > Same as before for 0-4h on July 2nd.
> > 
> > > Same as before, for 0-1h on July 2nd
> > > 
> > > 
> > > > The last hour before the gas bottle change is summarized here. 
> > > > The first pic shows the 410 MHz spectra taken from 22-23h on the 410 MHz analyzer, in time slices of 0.1 sec from 0s-2s.
> > > > The second pic shows the spectra in 20ms slices from 1s-1.16s.
> > > > 
> > > > python3 e143_analyzer.py -s 1.0 -t 0.02 /home/dillmann/.../sparc-daq-02.gsi.de/E143-410MHz/410MHz-2021.07.01.22*
> > > > 
> > > > The third spectra was taken in May, for comparison.
> > > > 
> > > > I don't think we see anything...
Attachment 1: July2-4-0-6h-410MHz_AllSpectra_0.025s_steps_start_1.04s.png
July2-4-0-6h-410MHz_AllSpectra_0.025s_steps_start_1.04s.png
  196   Fri Jul 2 04:27:38 2021 The remote Canadian beavers (Iris and Guy)AnalysisSummary of spectra 0:00-4:00 (410 MHz)
Same as before for 0-4h on July 2nd.

> Same as before, for 0-1h on July 2nd
> 
> 
> > The last hour before the gas bottle change is summarized here. 
> > The first pic shows the 410 MHz spectra taken from 22-23h on the 410 MHz analyzer, in time slices of 0.1 sec from 0s-2s.
> > The second pic shows the spectra in 20ms slices from 1s-1.16s.
> > 
> > python3 e143_analyzer.py -s 1.0 -t 0.02 /home/dillmann/.../sparc-daq-02.gsi.de/E143-410MHz/410MHz-2021.07.01.22*
> > 
> > The third spectra was taken in May, for comparison.
> > 
> > I don't think we see anything...
Attachment 1: July2-0-4h-410MHz_Spectra_0.02s_steps_start_1s.png
July2-0-4h-410MHz_Spectra_0.02s_steps_start_1s.png
  193   Fri Jul 2 02:03:36 2021 The remote Canadian beavers (Iris, Guy)AnalysisSummary of spectra 0:00-1:00
Same as before, for 0-1h on July 2nd


> The last hour before the gas bottle change is summarized here. 
> The first pic shows the 410 MHz spectra taken from 22-23h on the 410 MHz analyzer, in time slices of 0.1 sec from 0s-2s.
> The second pic shows the spectra in 20ms slices from 1s-1.16s.
> 
> python3 e143_analyzer.py -s 1.0 -t 0.02 /home/dillmann/.../sparc-daq-02.gsi.de/E143-410MHz/410MHz-2021.07.01.22*
> 
> The third spectra was taken in May, for comparison.
> 
> I don't think we see anything...
Attachment 1: July2-0-1h-410MHz_Spectra_0.02s_steps_start_1s.png
July2-0-1h-410MHz_Spectra_0.02s_steps_start_1s.png
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