 Sat Mar 28 16:12:25 2020, ruijiu, ragan, DAQ, enter ESR and turn on the HV crate.
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Sat Mar 28 16:29:27 2020, Ragan, RuiJiu, Esther, General, Malfunction of several ESR machines
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The HKR crew informs us that several machines in ESR are showing malfunctions.
The on-call expert cannot be reached.
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Sat Mar 28 18:11:13 2020, Alex, Yuri, General, no beam in the ESR
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Yuri and Sergey (on phone) have investigated extensively the problem with having no beam in the ESR. The FRS has been checked and seems OK. The ESR is fine
as well.
The problem seems to be the timing. Ths SIS and the ESR seem to be completely out of synchronization. The on-call service for the control system has been |
Sun Mar 29 09:40:35 2020, ruijiu, DAQ, restart go4 
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go4 crush up.
the problem is
due to mbs.
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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
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Sun Mar 29 10:09:14 2020, ruijiu, , start run e121_run_0237.lmd
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Sergey and Yuri are tuning Tl beam. The particle number in ers is about 1e4. I(SIS)=5e8
run stop: after few minutes (garbage data) |
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Sun Mar 29 11:12:00 2020, Ragan, Runs, start run e121_run_0239.lmd
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Sergey and Yuri are tuning Tl beam. The particle number in ers is about 1e4. I(SIS)=5e8
some events on MWPC can be seen ! |
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Sun Mar 29 12:56:02 2020, Ragan, RuiJiu, General, Good positive signals from MSCF
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As we (RuiJiu and me) changed the jumpers of MSCF 1, 2,3 and 4 yesterday, now we see nice positive signals on picoscope.
Yuri and Sergey are still working on optimising the Tl fragments ! |
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Sun Mar 29 13:04:32 2020, Ragan, RuiJiu, Runs, run file: 1298
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The Tl fragments are being stacked (almost ~20 staacks) and tried to store nicely in ESR.
The plan is to see the number of contaminants on the inner detector (CsISiPHOS) after the gas jet is on (Ar gas jet) and minimise this number for different
FRS settings !!
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Sun Mar 29 13:05:36 2020, ruijiu, DAQ, start ntcap
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IQ_2020-03-29_13-05-
56
SC_2020-03-29_13-05-
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Sun Mar 29 13:43:46 2020, , ,
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Sun Mar 29 14:01:45 2020, ruijiu, , beam position on DSSD
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move the detector 1cm
outside.from 60mm to
70mm.
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Sun Mar 29 14:29:13 2020, ruijiu, , e121_run_00240.lmd
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| s6 positon at 50mm. |
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Sun Mar 29 18:41:31 2020, ruijiu, Analysis, Ratio between MPWC rate and DSSD rate
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slit Ratio error
-1 18.64 0.4
-2 18.18 0.38
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Sun Mar 29 18:55:19 2020, Shahab, Runs, Frequency list for identification
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Here are some frequencies for identification of the fragments.
Center freq: 243.352675
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Sun Mar 29 20:32:20 2020, Ragan, General, Template for Pb halflive measurement
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beam:
energy:
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Sun Mar 29 21:02:43 2020, ruijiu, Analysis, decay line of 205Tl beam
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decay line of 205Tl beam with Ar gas jet target on and S6 slit at -8mm
Ar gas density~1e12 atoms/cm2 |
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Sun Mar 29 21:34:46 2020, Ragan, Runs, First run
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beam: 206Pb81+
energy: 400 MeV/u
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Sun Mar 29 21:39:27 2020, ruijiu, Analysis, Ionization cross section and capture cross section for h-206Pb + Ar
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Ionization cross section = 1320 barn.
Capture cross section = 557+137+44.5=735.5.
sigma_Ion/sigma_cap=1.79 |
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Sun Mar 29 21:55:47 2020, Ragan, General, MWPC
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| Alex goes to Messhute to check the signals from MPWC. After he completes, we start with the measurements with the primary beam ) |