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  nuclear two-photon decay, Page 1 of 12  Not logged in ELOG logo
New entries since:Thu Jan 1 01:00:00 1970
Entry  Thu Jul 1 14:47:15 2021, Yury, Helmut, Accelerator, added high Brho scrapers ESR-scraper-overview.jpgscrapers-used.JPG
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.
Entry  Sun May 9 13:53:07 2021, Yuri, Wolfram, Andrew, Liliana, Calibration, Change of energy: Back as before Screenshot_2021-05-09_13-59-36.png
After looking at the spectrum it was concluded that the same isotopes, and no more, could be identified. 
Now we change the energy back to 441.7 MeV/u and will open the scrappers to see if Mn comes in. 

The picture shows the effect of going back to the previous energy and then the effect of opening the scrappers
Entry  Sat May 8 17:29:54 2021, Yuri, Sergey, Wolfram, Michael, Shahab, Runs, recording Kr decay measurement on NTCAP 
Uc = 250mA
decay Kr 78, 476 MeV/u

in iso mode

NTCAP is running
Entry  Wed Jun 30 13:57:14 2021, Yuri, Sergey, Accelerator, sextupoles + scraper positions photo_2021-06-30_14-09-08.jpgphoto_2021-06-30_14-02-25.jpg
After setting up on 70Se
Sextupoles were adjusted to optimize the resolution of the 70Se peak. Set values are in the ESR logbook.
The SIS energy was shifted up to increase the number of 70Se.
Esis original = 445.68 MeV/u
Esis now = 451.68 MeV/u (+6 MeV/u)

See attached pictures

scrapers: 
GE01DS_HI =  -58mm
GE01DS_HA = +130mm (fully open)
GEEXDD2_S = -0.5mm
GEEXDS2HA = -11.2mm
Entry  Wed Jun 30 09:04:50 2021, Yuri, Markus, Accelerator, Status 
1) Over night the source was conservated. It is being restarted now.
2) The approximated amount of Gas in this bottle shall allow for running until tomorrow morning (~24 h). There is still another bottle in reserve (1 l) and one reserve from GANIL (0.5 l).
3) Beam-time coordinator suggests to run until the gas is over, i.e., up into the weekend.
Entry  Thu May 6 21:26:02 2021, Yuri et al., Accelerator, Energies 
gamma_t = 1.3955
Br(72Ge) corresponds to 6.79575 Tm
E (Kr) at Br(72Ge) = 392.9 MeV/u
ESIS = 467.45 MeV/u (pre-drilling, after 1.8 g/cm2 target)
ESIS = 440.98 MeV/u (final energy for 72Ge)

-during setup, a 20 mm offset in the TE line was observed. Beam centered via changing the Br of the beamline (~4 MeV/u up). Optimized pre-drilling transmission ~20% (with thick target)
Entry  Tue May 4 13:26:40 2021, Yuri, Simulations, Expected spectrum 72Ge 
A       Z      M/q                Int    difference in kHz@245MHz
68	30	2.263614752	35	-933.1
70	31	2.255131564	124	-457.0
36	16	2.247394703	1	-21.2
45	20	2.24726171	1	-13.7
81	36	2.247136805	1	-6.7
72	32	2.247041397	376	-1.3
72	32	2.247018215	376	0
63	28	2.246941324	1	4.3
54	24	2.246906236	1	6.3
74	33	2.239572482	568	420.9
65	29	2.238342523	100	490.5
76	34	2.232371568	62	829.3
67	30	2.230357529	100	943.7
69	31	2.222859086	172	1370.7
60	27	2.219224118	100	1578.3
62	28	2.211179746	100	2038.7
77	35	2.197207311	116	2842.5
Entry  Fri May 7 09:56:43 2021, Yuri, Calibration, Identification Verification 
With closed scrapers there are only a few weak lines.
Open temporarily all scrapers in the ESR to write down the frequencies. 
Entry  Fri May 7 09:58:04 2021, Yuri, Accelerator, Setting up KO extraction for Caves 
SIS optimisation requires us to stop. Only sporadic shots.
Entry  Fri May 7 10:05:06 2021, Yuri, Accelerator, E02DS3HG does not drive 
E02DS3HG stays at -35 mm and does not react
Entry  Fri May 7 10:46:40 2021, Yuri, Accelerator, GE02DS3HG 
The scraper is blocked at -10 mm and -unfortunately- blocks the beam in the ESR. Uli Popp is taking care.
Entry  Fri May 7 14:06:02 2021, Yuri, Accelerator, SIS kicker failure 
 
Entry  Fri May 7 16:09:50 2021, Yuri, Accelerator, Stop, change of sextuple settings 
 
Entry  Sat May 8 11:42:21 2021, Yuri, Accelerator, KPs 
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.
Entry  Sun May 9 14:19:44 2021, Yuri, Accelerator, Spectrum 
We accept larger m/q values than we like to. m/q(low) cut ~ 2.08. Decrease ESR energy from 369.2 -> 368.4 MeV/u
frequencies shifted by -37.5 kHz (at 60 MHz)
Entry  Fri Jun 25 21:47:24 2021, Yuri, Analysis, Identification Spectrum_possible_ID.pngID_2nd_Part.jpg
Attached are two files with a proposed particle identification.
Different colors indicate different harmonic numbers
Entry  Wed Jun 30 08:59:37 2021, Yuri, Accelerator, 70Se setting 
X(9Be)=1.815 g/cm2 (adjusted in primary beam setting)

Gamma_t=1.3956
E(70Se)=368.499 MeV/u
Br(70Se)=6.21993 Tm

Pre-drilling:
E(78Kr)@Br(70Se)=337.461 MeV/u
E(SIS) = 415.792 MeV/u

Fragment Setting:
E(SIS) = 445.68 MeV/u
Entry  Fri Jul 2 13:10:00 2021, Yuri, Accelerator, Scrapers 
12:46 moved the TOF detector scraper back to -11 mm
Entry  Fri Jul 2 16:14:17 2021, Yuri, Accelerator, Scrapers 4 72Br 1C28A49A-5FA1-4A81-8675-3ED9660FD793.png
Starting 15:15
The scrapers are moved very much close to each other to eliminate all background particles and leaving basically single ions injected for 72Br. Do not wonder, this means that also many empty files are created.
Scrapers:
E02DS3HG -> -40 mm
EEXDS1HG -> +5 mm
EEXDS2HA -> 0.0 mm

One sees probably a decay of 100 keV isomer, see the attached figure at about 18 s
We will run a few hours with this setting
Entry  Fri Jul 2 20:33:44 2021, Yuri, Accelerator, 70Se setting with closed scrapers 
We tune back to 70Se.
The scrapers stay closed at EEXDS2HA=0 mm, EEXDS1HG=+5 mm
"Single"-particle run
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