 Sat Mar 28 01:14:19 2020, Ragan, General, Cross-section for capture and ionisation of 206Pb81+ with H2 target 
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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. |
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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
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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 13:19:56 2020, Ragan, Runs, Template
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beam:
energy:
storage time:
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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 20:32:20 2020, Ragan, General, Template for Pb halflive measurement
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beam:
energy:
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Sun Mar 29 21:34:46 2020, Ragan, Runs, First run
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beam: 206Pb81+
energy: 400 MeV/u
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Sun Mar 29 21:55:47 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 ) |
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Mon Mar 30 00:32:32 2020, Ragan, Runs, First measurement with 206Pb81+ beam
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beam: 206Pb81+
energy: 400 MeV/u
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Mon Mar 30 01:01:53 2020, Ragan, Runs, First measurement with 206Pb81+ beam
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beam: 206Pb81+
energy: 400 MeV/u
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Mon Mar 30 01:07:29 2020, Ragan, General, Problem with SIS runstop: 0256
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There is problem with SIS
Run stop: 0257.lmd (at1:06) |
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Mon Mar 30 01:25:57 2020, Ragan, Runs, First measurement with 206Pb81+ beam
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01:17 Problem with SIS is solved
01:19 run start 0258.lmd
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Mon Mar 30 01:43:58 2020, Ragan, General, First measurement with 206Pb81+ beam pattern details
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The following shows the pattern for first measurement in ESR (gas jet is on for = 60*5 secs = 300 secs as it can be seen on step SC7 in pattern).
One injection cycle runs for ~ 6 mins. |
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Mon Mar 30 02:00:46 2020, Ragan, Runs, First measurement with 206Pb81+ beam
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beam: 206Pb81+
energy: 400 MeV/u
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Mon Mar 30 02:27:44 2020, Ragan, Runs, Second measurement with 206Pb81+ beam at I_cooler = 200 mA
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I_cooler = 200 mA
beam: 206Pb81+
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Mon Mar 30 04:15:29 2020, Ragan, General, Second measurement with 206Pb81+ beam at I_cooler = 200 mA
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In the picture below, a very nice storage of 206Pb81+ at 200 mA electron cooler current for no gas jet target can be seen in ESR. The measurement started
at 02:24 and we will now finish it in 5-10 mins. We will now do two more measurements for I_cooler = 10 mA ans 20 mA. |
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Mon Mar 30 06:15:13 2020, Ragan, Runs, Second measurement with 206Pb81+ beam at I_cooler = 20 mA
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I_cooler = 20 mA
beam: 206Pb81+
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Mon Mar 30 06:30:52 2020, Ragan, Runs, Second measurement with 206Pb81+ beam at I_cooler = 20 mA
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I_cooler = 20 mA
beam: 206Pb81+
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Mon Mar 30 06:34:47 2020, Ragan, General, Second measurement with 206Pb81+ beam at I_cooler = 20 mA
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In the ESR picture below, the decay of beam is very fast initially for few minutes and then the decay is constant. But why does it decay for first few minutes
? |
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Mon Mar 30 20:51:06 2020, Ragan, Detectors, Bias Voltage for Si-pads
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The limit of the leakage current for all Si pads was increased from 1500 nA to 5000nA and
leakage current was recorded for different Bias Voltages (32V, 35V, 40V, 45V, 50V, 55V
and 60V).
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