ID |
Date |
Author |
Category |
Subject |
35
|
Fri May 7 07:52:12 2021 |
Ragan, Andrew | General | To 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. |
37
|
Fri May 7 08:55:33 2021 |
Ragan, Andrew, Yuri | General | Trigger 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. |
98
|
Sun May 9 06:15:09 2021 |
Iris, Chris G., Jacobus, Michele | Runs | Triplet: 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).
> |
56
|
Fri May 7 19:56:10 2021 |
Kanika, Michael, Shahab | Runs | ZOOM session restart | restart zoom session |
69
|
Sat May 8 07:34:08 2021 |
Akash, Nic, Jelena, Zsolt | General | Zoom has its own mind | Zoom kicked us all out... we managed to get back in...screen sharing is back on. |
125
|
Mon May 10 01:34:37 2021 |
Chris C | General | Zoom screenshot | How things look currently in Zoom-world. |
167
|
Thu Jul 1 14:47:15 2021 |
Yury, Helmut | Accelerator | added 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. |
58
|
Fri May 7 20:34:27 2021 |
Kanika, Michael, Shahab | Runs | back to 15 sec recording | now we are going back to 15 sec operation. Cave M (bio) operation is over |
145
|
Wed Jun 30 01:38:20 2021 |
Shahab | Runs | beam is back from Linac but not in the ESR | |
76
|
Sat May 8 16:08:58 2021 |
Helmut Weick | Accelerator | beam 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. |
18
|
Thu May 6 21:45:30 2021 |
Helmut | Detectors | beam 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. |
59
|
Fri May 7 22:00:36 2021 |
Chris | Accelerator | brief beam loss | Brief interruption in beam, ~21:42-21:51. |
55
|
Fri May 7 18:43:13 2021 |
Kanika, Michael, Shahab | Runs | cave M experiment needs more spills | our pattern causes beam loss while scanning the biological probes in the Cave M bio experiment. They loose every other spill due to high request rate from ESR.
For the next 2 hours, the operators have changed the spill pattern that as long as they are scanning , we get only every 1 minute, otherwise we get our 15 seconds as usual.
after two hours this situation should be tuned back to the original spill pattern. |
86
|
Sun May 9 01:49:25 2021 |
Helmut, Sergey, Yuri | Accelerator | change to 52Mn |
It was done in steps:
isochronous 52Mn should come at Brho = 6.28239 Tm (gamma_t = 1.3955).
set ESR to m/q and E for 52Mn, 368.41 MeV/u
1.) predrilling 1st try
- set beamline to E, q for 52Mn and m = 51.9319 u by trim
- E-SIS = 422.1 MeV/u
but then not centred on profile grids, with thick Be target in
-15mm on TE4DGC also not on Lecuhttarget, not good
2.) pre-predrilling 2nd try
don't set beamline for 52Mn but define it as 78Kr, in trim mass back to 77.92 u.
insert Cu-40 mg/cm² and inject, just use dE = 1.5 MeV/u in stripper for SIS-energy (343.353 + 1.5) MeV/u
optimise a bit, then keep beamline energy set as 78Kr36+ beam the same.
3.) pre-drilling 422.1 MeV/u in SIS
insert Be target and optimise with kicker and septum angle,
energy also tried but back to old value, reache 6 - 7 % transmission
4.) change E-SIS to 440.7 MeV/u to get 52Mn in ESR at gamma_t |
115
|
Sun May 9 22:31:23 2021 |
Helmut, Wolfram, Yuri | Accelerator | change to 72Ge | we change back to 72Ge
just change SIS-energy E = 441.0 MeV/u
beamline energy after target E = 392.9 MeV/u
set ESR to A=72, Z=32 (72Ge)
--> good injection and resolution in ESR, at old frequencies |
138
|
Tue Jun 29 20:13:58 2021 |
Helmut, Sergey, Yuri | Accelerator | change to predrilling an 72Ge | After optimisation of sextupoles we found a scraper position which makes a narrow peak and keeps 20% of the injected beam.
GEEXDS2HA = +2.0 mm (out is +130mm)
GE01DS_HI = -75 mm (out is -130mm)
removed scrapers again for predrilling.
We agree on gamma_t = 1.3956, E/m = 368.50 MeV/u.
Then for 78Kr at Brho = 6.79675 Tm of isoc 72Ge
E-SIS = 466.63 MeV/u, assume target of 1815 mg/cm² Be
after target E/m = 393.024 MeV/u
In ESR-Modi set for same E/m but different m/q (m=72, Z=q=32)
Injection looks good like before with isochronous 78Kr we go directly to the next step
72Ge with E-SIS = 440.16 MeV/u to get 72Ge at gamma_t. |
110
|
Sun May 9 18:50:23 2021 |
Helmut, Wolfram, Yuri | Accelerator | changed to 70Se | 18:45 changed SIS, ESR setting for 70Se without predrilling blind change.
E-SIS = 446.55 MeV/u, is centerd as before on TE3UF target grid.
set beamline after taret as 78Kr 36+ E = 337.375 MeV/u
set ESR to A = 70, Z=34 at isochronous E/m + 0.8 MeV/u = 369.2 MeV/u
kicker delay unchanged
4 quadrupoles failed during the change, skip cycle and reset, they work again, (GE01QS0D, GE01QS1F, GE01QS2F, GE01QS4F)
Now many lines in Schottky.
also 2 corrector coils were off, on again, now good resolution. |
137
|
Tue Jun 29 10:32:10 2021 |
Sergey, Helmut | Accelerator | cooler curves for tuning of isochronicity | Variation of quadrupole E01QS03D to change gamma_t in isoc. mode
measured with 78Kr at 368.5 MeV/u on 28.06.2021 evening.
The shape of the three curves looks very similar they would only require a different beam velocity.
But I suppose we stay with the value close to the old one (gamma_t ~ 1.3956). |
6
|
Tue May 4 21:49:04 2021 |
Helmut Weick | Simulations | cut Brho by scrapers | The dispersion from the production target into the ESR is not matched.
This is not good for momentum acceptance, but we anyway want to cut the acceptance.
Dispersion will oscillate with the tune of ESR. After 3 turns we expect a maximum dispersion.
The picture shows in red the dispersion curve for dp/p=0.1% and beam envelopes of 10 mm mrad.
So we can use scrapers in north or south arc to cut Brho. It should be done from both sides.
How much? Watch the intensity drop.
Best positions look at plot. Straight section outside for low Brho, arc outside for high Brho.
Could be EEXDS2HA and E02DSH (outside). |
5
|
Tue May 4 18:25:31 2021 |
Helmut Weick | Simulations | cutting of primary beam | The slits at TE4 and TE5 can be used to cut away the unwanted 78Kr beam (see pictures).
We do not want activation of the beamline. 78Kr35+ even has a chance of being injected. |
|