 Thu Jun 13 10:06:35 2024, Constantine, Peter, Lukas, Jonas, Dounia, Carsten, Accelerator, Suspected Beam Troubles (is it really 229-Thorium?)
|
From experience, the lifetime of the beam in the storage ring should be on the order of magnitude of hours, however, we observer beam lifetimes of the order
of 10ish minutes. This suggests either a beam loss mechanism, a totally wrong species or a combination of both.
|
Thu Jun 13 02:05:04 2024, Carsten, Accelerator, Short Lifetime at 100 mA 
|
| Lifetime still is short |
|
Wed Jun 12 22:48:55 2024, Carsten, , Beam Halo
|
The seamingly short live time reported in [URL=https://elog.gsi.de/esr/E0052/53]entry 53[/URL] is due to a halo from a different isotope (?). It can be
scraped away from the outside. The 229Th89+ primary beam can be scaped away from the inside and the halo stays. There is some spacial headroom between
the two components.
|
|
Wed Jun 12 21:21:15 2024, Yuri, Detectors, NTCap started
|
Fcenter - 244.6 MHz
BW - 10 MHz |
|
Wed Jun 12 18:48:43 2024, Afternoon shift, Runs, First laser scans
|
[TABLE border="1"]
Time | Part. Det. Int | ESR-intensity| cooler-HV | LMD-DAQ1 Files | LMD-DAQ2 Files | scan range(nm) | number of positions | dwell time(s) | n loops | comments
|-
|
|
Wed Jun 12 17:12:13 2024, Julian, Danyal, Rodolfo, Laser, Timing für 229Th89+
|
We did the timing Ion-Beam Laser-beam time overlap.
The ion revolution frequency (and therefore the bunching frequency) is: 1.5429 MHz. |
|
Wed Jun 12 12:12:44 2024, Konstantin Mohr, Julien Spahn, Jonas Koedel, Bernhard Maass, Accelerator, First Scraper Scan
|
Thorium is in the ESR, we have time to check the beam position with the scrapers.
Beam Intensity in the ring 6E-5
|
|
Wed Jun 12 09:43:57 2024, Carsten, Accelerator, Stopped NTCAP at 9:43
|
| Setup at ESR is carried on - stopped the long-time NTCAP run from overnight, |
|
Wed Jun 12 09:17:43 2024, Carsten, , Tests of background with ionization pumps on (from monday)
|
On monday the ionization pumps were switch on to test the background, and if it is possible to run with the pumps switched on.
Results and comments, see below:
|
|
Wed Jun 12 01:51:51 2024, RuiJiu, David, Analysis, ID
|
The preliminary identification has been thoroughly checked using the RionID software. We have confirmed that the identification is accurate.
Attached can be found the simulation file with each of the expected ions, their revolutions frequencies in the 125th harmonic and expected yield from the |
|
Tue Jun 11 23:46:06 2024, Carsten )))), Accelerator, ID
|
----
The frequency of the primary beam 238U82+ at the injection:
Ucool = -360 V
|
|
Tue Jun 11 22:59:06 2024, Carsten, Accelerator, Identification / NTCAP started
|
ESR is set-up in most parts.We are trying to identify our 229Th89+. It is more cumbersome then exspected because of the thick target an d the according
energy loss, the pattern has changed compared to the last beamtime.
|
|
Tue Jun 11 21:38:35 2024, Julian, Imke, Rodolfo, Laser, Wavemeter HeNe long time stability
|
The HeNe was running over night and the measured laser frequency of the wavemeter was logged, see picture.
A significant drift of around 300 MHz is visible during the night.
It is possible, that the laser lab got too cold during the night, as the pulsed laser was not running.
|
|
Tue Jun 11 21:23:11 2024, Julian, Imke, General, How to read out voltage
|
1.) If not already opened, open the Medusa Laser Control software, see picture:
2.) In the "view" submenu, choose "proteus status".
3.) At the bottom of the list, the K250 shows the scaled voltage. |
|
Tue Jun 11 09:17:46 2024, Julien, Konstantin, Lukas, DAQ, Important commands (DAQ1)
|
To connect to the DAQ1 pc, open a terminal and type:
ssh atplaser@r4l-41
Enter password for user atplaser ([B]note that you're typing on an English keyboard[/B]).
|
|
Mon Jun 10 11:59:12 2024, Ruijiu Chen, Analysis, The ion identification of spectrum recorded on 2022
|
| The simulated frequency is given in simulation_result.out. The yield is calculated by LISE file. The LISE file is attached here also. |
|
Mon Jun 10 09:17:38 2024, Carsten, DAQ, Updated Channel List
|
| |
|
Mon Jun 10 08:57:35 2024, Carsten/Konstantin, DAQ, Further Tests from Sunday 2024-06-09 - new voltages and tresholds for PMTs - testdata in files
|
Voltages and thresholds increased for PMT Middle and North (in order to account for the ADC measurement in DAQ2
[TABLE border="1"]
|
|
Sun Jun 9 10:20:38 2024, Carsten/Danyal, Detectors, Recap from yesterdays work with test beam (Detectors / beam /DAQ)
|
In the ESR we had thw whole day (saturday) a 400MeV/u bunched 238U92+ test beam (about 2 MHz). The RF signal is cabled as input to the DAQ (seperate post/entry).
Intensity is artificially reduced to a few 10^6 (with some tests alsodone at 10^5).
In all the tests the both particle detectors were moved in pus the empty pocket on the inside to mimick the background conditions during the run (aka no |
|
Sun Jun 9 10:08:24 2024, Carsten/Danyal, Detectors, Particle detectors - Recap of yesterdays work
|
[B]South (behind cooler) - "SA_SZ" - DD2...[/B]
We have put the particle detecotr North to the poistion behind the cooler (north) to replace the defective particle detector.
This detector is an old "Kozhuharov" style plastic szintillator that runs with a voltage of 1400-1500 V.
|