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  nuclear two-photon decay 2024, Page 5 of 6  Not logged in ELOG logo
New entries since:Thu Jan 1 01:00:00 1970
Entry  Wed May 15 19:20:32 2024, Helmut Weick, Accelerator, scraper setting IMG_20240515_193017_HDR.jpgIMG_20240515_192644.jpgIMG_20240515_182802.jpg
After the orbit correction on the target straight section the scrapers work better.
One pair of scrapers works best:
GEEXDS2HA (outside straight section =  low Brho side) = -4.0 mm
GE02DS3HG (outside arc              = high Brho side) = -71.4 mm
All other scrapers are open (finished playing with scrapers ~18:20)
When one side is opened more one can cut more on the other.
We can attack the beam from both sides.
With scrapers good resolution, David already posts lifetimes of the isomer.
Details in paper log book.
Entry  Wed May 15 18:37:36 2024, Jeroen, Johan, Shahab, Runs, Beam returned to ESR 2024-05-15_18-37-57-073_tcl1064.png
Beam returned at 18:30:55. Taking data with new triggers.
Entry  Wed May 15 17:47:34 2024, Jeroen, Johan, Shahab, General, New Trigger Setup 2024-05-15_18-06-54-910.png
We changed the trigger setup, see attachment
Entry  Wed May 15 17:45:09 2024, Jeroen, Johan, General, No beam to ESR 
Beam lost from SIS18 at 17:41:41.
Entry  Wed May 15 17:22:43 2024, Jeroen, Shahab, Johan, Runs, 98Mo run 
Beam tuned at 4:50, data acquisition aligned for 98Mo at 4:56.
Entry  Wed May 15 16:55:10 2024, Jeroen, Johan, General, Tuning ESR scraper. Isomer resolved. 
4:50 Scraper tuned to produce Gaussian beam profile for 98Mo. Isomer now clearly resolved.

Plan to take data for 98Mo fragment for 12 hours. Measurements from 4:59 are now aligned so that the Molybdenum fragment is centered in the RSA acquisition.
Entry  Wed May 15 13:39:10 2024, Beatriz, Min, General, ESR setting 
From 13:37 ESR will be changed again. Now back to the primary beam, it will be attempted to measure the orbit of the beam.
Entry  Wed May 15 12:58:12 2024, Beatriz, Min, Shahab, Runs, optimizing the mass resolution 
Yuri and Sergey still optimizing the mass resolution.

From 13:10 to ~ 13:35 SIS energy was increased to 457.4 (~3 MeV/u) to test whether this moves the best isochronicity to 98Mo (we were off before), -> Brho(98Mo)=7.12736 Tm

From ~13:35 back to setting up with the primary beam at 441.95 MeV (with target, same Brho as the 98Mo fragments). It will be attempted to measure the orbit of the beam
Entry  Wed May 15 11:59:32 2024, Beatriz, Min, DAQ, File transfer to lustre looks to be stopped 
File transfer to lustre looks to be stopped at around 11:35AM
Entry  Wed May 15 11:45:22 2024, David, Analysis, Lustre Trouble 
Since around 11:30, Lustre is down, therefore in https://sparc-daq-02.gsi.de/, the spectrograms are not being updated. Expected time to recovery > 2 hours.
The data will still be stored on the local hardisk. Whenever Lustre is online, we start file transfer and analysis.

Attached can be found an information email sent:
-------------------
Dear Lustre-users,

the main metadata server of the Lustre file system shows repeated errors that break I/O on at least
some clients.

We will have to restart the server, which will cause a downtime of min. 2 hours.
-----------------------------------------------------------------------
Entry  Wed May 15 10:58:32 2024, Beatriz, Min, General, Beam returned to ESR 
Beam recovery at around 10:52:30. Sergey and Yuri still tuning the mass resolution.
Entry  Wed May 15 09:35:08 2024, Beatriz, Min, General, No beam 
At 9:32 we lost the beam. They have to work in the Unilac and there will be no beam for 45 minutes. 
Entry  Wed May 15 06:15:02 2024, Chris, Asahi, DAQ, Data transfer to lustre looks to be stopped Screenshot_2024-05-15_06-18-17.png
File transfer to lustre looks to be stopped at 6:03

File copy program had stopped for some reason. 
After figuring out what the problem was, we have restarted the file copy and everything seems to be catching up.
Entry  Wed May 15 02:12:59 2024, Chris G, Asahi Y, General, Beam returned to ESR 2024-05-15_02-14-16-471.png
Injection to ESR restarted around 02:12:15
Entry  Wed May 15 02:07:02 2024, Chris G, Asahi Y, General, No beam to ESR 2024-05-15_02-08-05-614.png
Injection to ESR stopped around 02:04:45.

Will continue to write data in hope that beam returns shortly.
Entry  Wed May 15 01:27:13 2024, David, Asahi, Shahab, Chris, DAQ, Restarted data taking 
Data taking restarted at 01:27 following re-alignment of the RSAs.

Also reduced number of processing threads to 10.
Entry  Wed May 15 01:11:45 2024, David, Asahi, Shahab, Chris, Ruijiu, General, Time optimisation 
DAQ stopped at 01:11 to optimise data taking cycle of RSAs. 
Changed data writing time from 2s -> 1.8s.
Entry  Wed May 15 00:26:53 2024, David, Asahi, Shahab, Chris, Ruijiu, Runs, First data file - 00:26 
Centered resonant frequency on 98Mo+42 at the 126 harmonic (243.925 MHz) and 211 harmonic (408.483 MHz).
Recording for 2 seconds (injection start at 10%), injection every 6 seconds. 
Entry  Wed May 15 00:17:24 2024, David, Asahi, Shahab, Chris, Ruijiu, DAQ, Optimizing the 245 resonance curve 2024-05-15_00-18-18-752.png
 
Entry  Wed May 15 00:06:10 2024, David, Asahi, Shahab, Chris, Ruijiu, DAQ, Optimizing the 410 resonance curve 2024-05-15_00-05-36-583.png
 
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