> Run E143-245 MHz-2021.05.09.01.17.42.265.tiq is the first run of the experiment on 52Mn.


And Run E143-410MHz-2021.05.09.03.27.37.368.tiq	from 2021-05-09 03:27 is the first run on the 410 MHz detector. Started a bit later than the 245 MHz detector.
 

ESR warning (colour red in the panel)

Operator intervention required. 

Runs affected by this issue: 

-from E143-245MHz-2021.05.09.02.49.48.521 (03:50) 
-to E143-245MHz-2021.05.09.02.54.54.239 (03:54) .  



  

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).




> So the "isomers" pop up at ~-600 Hz and +580 Hz... is the -600 Hz on the left the 378 keV isomer (21 min) and the +580 Hz on the right the g.s.?

So the "isomers" pop up at ~-600 Hz and +580 Hz... is the -600 Hz on the left the 378 keV isomer (21 min) and the +580 Hz on the right the g.s.?

this is how it should look like

the intensity of the line on the left side is so high, it is difficult to see the isomers in the middle as can be seen in the auto generated picture

Run E143-245 MHz-2021.05.09.01.17.42.265.tiq is the first run of the experiment on 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

To improve the isochronicity still in the 72Ge setting sextupoles and scrapers wer varies successfully.

1. E02DS_H -130 / 130mm  - wide rect. peak
            -30 / 130    - nothing 
            -35 / 130    - weak but broad
            -70 / 130    - wider rect peak
            -70 / 30     - two peaks
            -70 / 10     - peak + small peak
            -70 / 0      - peak  + tiny peak
   cannot move more than 0, back to 
            -70 / 50

2. E01DS_H: -130/130    -   wide rectangular distribution
             -40/130    -   wide double structure
             -35/130    -   very weak, still double structure
 some sectupole tuning
             -40/0      - nothing
             -50 / 0    - peak with right tail
  cannot close outside more than 0 so try next scraper

3. E01DS3HG
  -130  - peak with long right tail
   -30  - nothing
   -50  - peak with long right tail
   -40  - weak peak with long right tail
  ==> no good scraper do not use

4. EEXDS2HA
   -120   - peak with long right tail
    -20   - peak with long right tail
      0   - peak with less right tail
     10   - small peak, no right tail
      5   - smaller peak, no right tail
      3   - smaller peak, with small right tail
      8   - small peak no tail
  ==> good scraper use it (+8mm)

5. Try a bit more on E01DS_H
  -55 / 0  - small peak no tail
  -55 / 50 - same no loss in resolution
  -55 /130 - same no loss in resolution
  -65 /130 - same good peak, but higher intensity
  -75 /130 - same good peak, but left tail
  -65 /130 - same good peak, no tail

6. open E02DS_H to -130 / 130 no difference 

7. again E01DS_H
 -125 /130 - very wide left tail
  -68 /130 - one peak
  -72 /130 - one peak, samll left tail
  -66 /130 - one peak, no tail
 ==> good scraper use it (-66mm)

8. check all other scrapers they are all open
   also open TE4 slits to +/-20mm, no difference, back to +/-10 mm

9. bit more sextupole variation on the narrow line

===>  only two scrapers used 

   

picture shows result afterropimisation, the markers indicate the lines,
the left marker is for a +691 keV isomer.








 

last file names with this setting:

245: 2021.05.08.20.42.03.743.tiq
410: 2021.05.08.21.42.17.969.tiq

Details will follow
E(Mn) = 368.41 MeV/u

after optimizing the scrapers we have reached the highest possible resolution in the isochronous mode.

starting data taking with this new settings.

last files before this settings were:

245: 2021.05.08.14.14.55.114.tiq
410: 2021.05.08.15.15.10.101.tiq

The optimisation of sextuples is finished. Record a few files.

Start a new run. The data of new run is in :
SC_2021-05-08_19-51-35
IQ_2021-05-08_19-51-35

The beam in ESR is 78Kr36+@476 MeV/u.
Start a new run:
SC_2021-05-08_18-25-52
IQ_2021-05-08_18-25-52

Uc = 250mA
decay Kr 78, 476 MeV/u

in iso mode

NTCAP is running

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.

Beam settings are being changed back to 78Kr beam at 467 Mev/u. 

EO1KP03 was on = -44.9 A
E01KP05 was off, now is on = 3.67 A
The beam is on the right frequency, but the width is still very broad.