 Sat Apr 4 17:32:01 2020, Ragan, Alex, Esther, General, No beam in ESR
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The beam is coming from SIS but doesn't arrive in ESR because the quadrupole magnets in ESR have failed.
Update (18:01): Problem has been resolved. |
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Sat Apr 4 18:57:49 2020, Ragan, Alex, Esther, General, Timing problem with SIS & ESR and problems with stacking
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There are further problems with beam stacking in ESR. It works occasionally but keeps failing.
There is also timing problem between SIS and FRS. |
Sat Apr 4 22:31:02 2020, Alex, Esther, General, Beam in ESR lost 
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The beam in ESR was lost suddenly at ~22:20 due to a power supply failure of the quadrupoles.
Update (~20:40): Failure was resolved and new stacking started. |
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Mon Apr 6 20:03:50 2020, Ragan, General, Experiment finished ))
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E121 experiment is finished with the last 10 hours measurement at 19:47 ))
Many thanks to everyone for there significant contributions )) |
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Thu Apr 9 11:16:35 2020, Ragan, General, Measurements done in the experiment
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Mon Apr 20 11:17:18 2020, Ragan, General, Logbook
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Sun May 30 12:09:00 2021, Ragan, General, NTCAP
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Attached is the info given by Carsten.
The instructions to operate NTCAP are given on https://wiki.gsi.de/ESR_EXP/ManualOfNTCAP |
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Wed Dec 5 17:29:24 2018, Chen, Sidhu, Detectors, signal map 13x
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Description:
Here is a summary of signal map. The charged particle detector includes 6 layers of Si-Pad, 1 DSSD and 1 CsI.
All these detectors are installed inside the detector pocket. All signals are connected to one PCB which is attached on the pocket, then are connected
to the PCB of the flange by high density cable. This document descripts the signal map on the PCB of the detector
pocket and flange.
The signal maps of the PCB of the detector pocket are shown as follow:
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Mon Dec 10 11:59:15 2018, Chen, Sidhu, Detectors, Test of shaping amplifier.
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Tue Aug 27 14:53:47 2019, Chen, Sidhu, Detectors, The thickness uncertainty of Ta is less than 1%.
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The thickness of Ta plate have been measured by target group. The result is show as following.
According to this measurement, the thickness uncertainty is less than 1%.
This thickness uncertainty is good enough for Tl experiment.
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Thu Oct 24 15:36:13 2019, Chen, Sidhu, Detectors, Detector installation process
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Thu Feb 27 14:04:12 2020, Ruijiu Chen, Detectors, Remote control of HV module
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Be careful. The voltage value on user interface is 10 times of real value. e.g. if the real value is 32V, the voltage value on UI has to be 320V.
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Sat Mar 28 04:32:15 2020, Ragan, Detectors, Ionisation events on DSSSD
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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. |
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Sat Mar 28 04:50:34 2020, Ragan, Detectors, MWPC
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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. |
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Sat Mar 28 11:00:14 2020, Ragan, RuiJiu, Mei, Yuri, Tino, Detectors, Movement of detector
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10:51 am the CsISiPHOS is moved to 65 mm from 60 mm.The spot on the DSSSD is changed by 5 mm which confirms the hit of the beam.
11:05
Detector is moved back to 60 mm. |
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Sun Mar 29 09:57:26 2020, ruijiu, Detectors, the HV of charged particle detector
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MHV1 MHV2
ch1:1st Sipad 4th
Sipad
ch2:2nd Sipad 6th
Sipad
ch3:3rd Sipad DSSD
ch4:4th Sipad CsI |
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Mon Mar 30 13:40:57 2020, ruijiu, Detectors, HV of Inner detector
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Mon Mar 30 13:41:20 2020, ruijiu, Detectors, HV of Inner detector
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Mon Mar 30 14:48:02 2020, ruijiu and Tino, Detectors, The leakcurrent of SiPad is over the setting limit.
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Because the
leakcurrent of
6 Sipads is
over the
setting limit,
the alarm of
HV module is
sounding.
Ruijiu
increase the
limit to 1500
uA. |
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Mon Mar 30 15:03:58 2020, ruijiu Tino, Yuri, Lasoro, Nik and Uli, Detectors, the gas bottle is empty.
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The gas bottle was empty. Tino replaced
the previous old bottle with 50 bar gas left.
Yuri is getting new gas bottles.
Yuri got a new gas bottle. We repalced
the the new gas bottle. There is 200
bar gas left now.
The old gas bottle with 50 bar gas
left was kept inside ESR.
The empty gas bottle was removed from
ESR.
The outlet volve was decreased by 30 degree.
Since the value is almost 0, we can not read the value of outlet volve. |