ID |
Date |
Author |
Category |
Subject |
180
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Tue Dec 8 15:47:07 2020 |
Jan | Detectors | manual preamp & shaper settings for CsISiPhos |
attached is a document showing fotos of all involved amplifiers in the chain to document the manual settings active during the experiment.
Summary:
Si-pad n-sides [MSI-8 (1)] were set to 5 GeV (expected E-deposition ~2 GeV)
Si-pad p-sides [MPR-32 (1 & 2)] were set to 1 GeV (expected E-deposition ~2 GeV)
DSSD channels [MSI-8 (2)] were set to 5 GeV (expected E-deposition ~1.2 GeV)
CsI channels [MSI-8 (2)] were set to 4 GeV (expected E-deposition 46 GeV)
It seems we got clipped signals from the Si-pad p-sides, because the MPR-32 were saturated due to a wrong gain setting.
This might explain, why there was not real influence on the spectra when adjusting MSCF settings for those channels.
I cannot comment on the CsI gain setting, because i don't know whether the given GeV-range by MesyTec directly applies for CsI & photodiode.
However, for DSSD and Si-pad n-sides the settings look okay. |
Attachment 1: amp_settings.pdf
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181
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Tue Dec 15 09:25:41 2020 |
Jan | DAQ | SiCsIPhos signal/amplitude reconstruction |
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Attachment 1: amps.pdf
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184
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Wed Aug 25 15:13:41 2021 |
Jan | DAQ | SC13 clock frequency |
The frequency of the clock used as reference in scaler channel 13 has been measured precisely.
In contrast to what was expected (1.5MHz precisely), it is:
f_ref = 1.5625(5) MHz |
1
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Thu Sep 13 11:32:17 2018 |
Jan Glorius | Collaboration | Proposal |
Attached is the beam time proposal submitted and accepted by the G-PAC in 2017. |
Attachment 1: E121_Litvinov.pdf
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Attachment 2: E121_Approval.pdf
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4
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Fri Dec 7 10:56:04 2018 |
Jan Glorius | SlowControl | EPICS ioc on raspberry |
We have an EPCIS server (ioc) running on our raspberry (ext-027377). It talks to our MesyTec modules (MSCF shapers, MHV4 high-voltages).
In principal it should be running all the time, but here is the manual how to check/start it:
-login on GSI-linux using <litv-exp> user
-type in console: e121pi (alias for: 'ssh -X litv-exp@ext-027377.gsi.de')
-open the "mrcc" screen session: screen -x mrcc
-if the ioc is running you will see here terminal outputs like:
Quote: | cbLow: Active ringpi:mrcc:mhv2:getRcStatus
cbLow: Active ringpi:mrcc:mhv2:getCurrent1 |
-if this is not the case, you have to restart the ioc:
- <Ctrl>+c to end any running ioc (if it has errors)
- the command to start the ioc: e121_ioc (alias for '/home/litv-exp/epics/mrcc_ioc/bin/linux-arm/mrcc /home/litv-exp/epics/mrcc_ioc/iocBoot/iocmrcc/start_ringpi.cmd')
- now the terminal outputs should be as quoted above (errors show up in red)
- finally <Ctrl>+a d to exit the screen session |
5
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Fri Dec 7 11:39:41 2018 |
Jan Glorius | SlowControl | GUI for remote control of MSCF+MHV4 |
We have a GUI for remote controlling our MesyTec modules MSCF16 and MHV4 for E121 experiment.
Here is the instructions to run it:
1. login to GSI-linux using <litv-exp> user
2. get the EPICS environment by typing in terminal: epicsfind
3. type in terminal: GUIe121 (alias for 'medm -x /u/litv-exp/E121/medm/e121.adl')
if you get the message: 'medm: command not found' you didn't load the EPICS environment (2.)
The GUI is more or less self-explaining.
Be sure to follow this procedure when changing a value (e.g. threshold for MSCF):
1. click on small text-panel with value
2. leave mouse pointer inside panel
3. change value by typing
4. press enter |
14
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Fri Feb 21 11:30:52 2020 |
Laszlo | General | Shift plan |
e127: https://docs.google.com/spreadsheets/d/14m8WcCq1erx6HqWJRK7TLbCx121IkjqGa5l-frf4YjI/edit#gid=0
e121: https://docs.google.com/spreadsheets/d/10MUzA5-Ilf2WzCyNj8u_KSG6yzPg0e4vtZGGPFB3K-k/edit#gid=0 |
34
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Sat Mar 28 13:09:11 2020 |
Mei,Yury, Tino, Ragan, Ruijiu | General | Shift plan |
From Yury,
For now, measure the beam life time with 3 different electron current in the e-cooler,i.e. 200mA(default), 10mA, and 20mA. For each current, 4 sets of 30mins long measurements shall be taken.
Starting from 9pm Helmut and Sergey will come for setting up FRS |
182
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Mon Mar 29 16:31:09 2021 |
Pierre-Michel | DAQ | cross section |
(1.393*^-8 + 3.18*^-13 + 4.707*^-8)/4.707*^-8 = 1.29595 |
Attachment 1: Pb81onAr.png
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18
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Thu Mar 26 17:21:40 2020 |
Ragan | General | Stochastic cooling |
1) From SIS, 206Pb67+ @401.17 MeV/u goes to FRS where only SEETRAM is placed in the target area to strip off 206Pb67+ to get 206Pb81+.
2) There is 206Pb81+ (H-like primary beam) inside ESR at 400 MeV/u.
3) The ESR team is now trying Stochastic cooling with 206Pb81+ beam at 400 MeV/u. |
19
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Fri Mar 27 13:02:07 2020 |
Ragan | General | Stochastic cooling |
1) ESR team is successful with the Stochstic cooling of primary H-like 206Pb81+ beam @400 MeV/u.
2) Now, they are trying for stacking of the beam. |
Attachment 1: stochastic_cooling.PNG
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20
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Fri Mar 27 13:04:17 2020 |
Ragan | General | FRS Settings until now |
Yuri and Helmut have been extensively involved in tuning and optimizing of the FRS.
26th March, 2020 (Evening setting):
1) 206Pb67+ beam from SIS @401.17 MeV/u.
2) SEETRAM in target area of FRS is used for stripping the beam from SIS to get 206Pb81+ and is then transported to ESR @400 MeV/u. (SEETRAM consists of three Ti foils of ~10 um thickness which are used for stripping purpose (more info: https://www-win.gsi.de/frs-setup/ ))
3) SL1 slits are opened +-10 mm to get rid of other charge states of 206Pb and only transport 206Pb81+ through FRS.
27th March, 2020 (Evening setting):
1) Different target (Be 1-6 g/cm2 with Nb backing) and degrader (Al)thicknesses are used for the optimization of 206Pb81+ with matter in FRS to get the beam with @400 MeV/u in ESR.
2) 206Pb67+ beam from SIS @540-560 MeV/u. |
Attachment 1: frs.pdf
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Attachment 2: FRS.pdf
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21
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Fri Mar 27 13:40:54 2020 |
Ragan | General | NTCap start and shutdown information |
The attachment contains information on how to start and shutdown NTCap and bridge computer. |
Attachment 1: ntcapmanual.pdf
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22
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Fri Mar 27 19:51:37 2020 |
Ragan | General | ESR Machine |
By changing the tune to Qx=2.33, Qy=2.36 the momentum acceptance was significantly improved. A variation of the cooler voltage of 10300 V was possible without beam loss. That corresponds to a momentum acceptance of 2.7 %. That should provide good conditions for longitudinal stacking.
Thanks to the ESR team ! |
23
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Fri Mar 27 19:59:09 2020 |
Ragan | General | Beam stacking in ESR is achieved |
Thanks to Sergey and Markus, stacking of primary H-like 206Pb81+ beam in ESR is achieved.
The stacking of the primary beam was established. There is continuous cooling on the injection orbit by stochastic cooling and by electron cooling on the stack orbit. (Time controlled operation of stochastic cooling could not be achieved due to controls issues). After stchastic cooling on the injection orbit the rf system decelerates the beam by 1.5 % in momentum and at the lower momentum electron cooling keeps the beam. The DC trafo shows accumulation of 10 injections of primary low intensity Pb81+ beam. Losses during the accumulation seems to be small. |
Attachment 1: 8B7F254E-DB10-48B6-9E2E-9CA0FF998C12.MOV
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Attachment 2: stacking.png
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24
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Fri Mar 27 20:05:43 2020 |
Ragan | General | H2 gas jet ready |
Thanks to Nikos, stable H2 gas jet target with 10^14 particles/cm^3 is ready.
(More information can be found on: https://ulpc24.gsi.de/cgi-bin/jet.py?gasart=Helium ) |
Attachment 1: BAFA7906-5F66-4108-86F9-6D61573B43CD.MOV
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25
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Fri Mar 27 20:52:31 2020 |
Ragan | General | Plans for the measurement with 206Pb81+ |
We plan to measure:
1. Lifetime of H-like 206Pb81+ beam with two electron cooler currents:
a) 200 mA
b) 10 mA (so that recombination rate is less)
using MWPC (capture detector in outer pocket) and CsISiPHOS (loss detector in inner pocket).
2. To find the efficiency of the MWPC. |
26
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Sat Mar 28 01:14:19 2020 |
Ragan | General | Cross-section for capture and ionisation of 206Pb81+ with H2 target |
Cross-section for capture and ionisation of 206Pb81+ with H2 gas jet target are calculated using GLOBAL code.
The ionisation (on CsISiPHOS) and capture (on MWPC) trigger rates are calculated for 206Pb81+ beam with 10^6 particles revolving in ESR ~2 MHz frequency with H2 gas jet target density ~ 10^14 particles/cm3. |
Attachment 1: GLOBAL.pdf
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27
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Sat Mar 28 04:32:15 2020 |
Ragan | Detectors | Ionisation events on DSSSD |
XY co-relation of DSSSD showing 206Pb82+ beam hitting the CsISiPHOS detector present in the inner pocket of ESR after the first dipole after the gas jet. 206Pb82+ is
produced by ionisation of
206Pb81+ due to interaction of beam with the gas jet. |
Attachment 1: 9800D808-D570-466D-8411-512D069F9233.jpeg
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28
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Sat Mar 28 04:50:34 2020 |
Ragan | Detectors | MWPC |
Alex and Pierre-Michel applied 1500 V to the anode and adjusted the threshold in Messhute.
x1 signal was small & noisy and rest of the signals were fine. |
Attachment 1: 4475A53F-48AB-430E-8A22-7D92E5FEACBF.jpeg
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