 Mon Mar 30 23:30:35 2020, Jan, Analysis, run251 - Si-pad performance & status 7x
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Attached are plots for Si-pad 2 with hits from ionization of 206Pb81+ at the target.
The plots are representative for all Si-pads, the pattern is always the same!
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Tue Mar 31 00:47:18 2020, Yuri, Runs, S2 slits 0/+35 mm, target bump +13 mm
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| Run start: 0276.lmd |
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Tue Mar 31 15:30:43 2020, ruijiu, Analysis, The beam position on DSSD with different conditions on on the dEE spectrum 6x
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| I analyzed the first measurement with 206Pb81+ beam, run 250-267. |
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Tue Mar 31 20:32:05 2020, Ragan, General, 203Tl80+ 200Hg79+ 205Tl81+
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Below in the schottky spectrum, on left is 203Tl80+ contamination, in middel is 200Hg79+ contamination and on right most is 205Tl81+.
These contaminations cannot be seen on CsISiPHOS but can only be seen on schottky.
The goal now is to get rid of these contaminations by putting slits. |
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Tue Mar 31 20:50:05 2020, Ragan, General, 200Hg79+ 205Tl81+
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203Tl80+ impurity is removed by moving scrapper inside ESR.
Only 220Hg79+ is left now |
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Tue Mar 31 21:07:05 2020, Ragan, General, Separation of 203Tl80+ and 200Hg79+ using scrapper in ESR
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It can be seen in the video how 203Tl80+ (on extreme left) and then 200Hg79+ (in middle originally) is separted from 205Tl81+ by using scrapper in ESR.
Now, we want 205Pb81+ mixed with 205Tl81+ to be separated as much as possible in FRS. |
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Tue Mar 31 23:31:41 2020, Shahab, Runs, alpha_p calibration
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Vc = 212849.9349
Ic = 0.2
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Wed Apr 1 01:02:24 2020, ruijiu, Detectors, the detector cable is disconnected.
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Wed Apr 1 01:05:36 2020, ruijiu, Detectors, detector position fixed at 60 mm
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| The detector cable was disconnected . We entered and reconnected the cable. |
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Thu Apr 2 02:36:48 2020, Ragan, General, Stochastic cooling and orbit problem
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On 1 April by 5 pm, we could stop the stochastic cooling after the stacking process and also change the orbit of the Tl beam to centre.
Thanks to the efforts by the ESR team ! |
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Thu Apr 2 02:38:32 2020, Ragan, Yuri, Sergey, Esther, Oliver, Runs, First measurement with zero storage time
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beam: 205Tl81+ (with no scraping)
energy: 400 MeV/u
storage time: zero
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Thu Apr 2 02:46:57 2020, Ragan, Yuri, Sergey, Esther, Oliver, Runs, Measurement with 2 hrs storage time
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Thu Apr 2 05:00:44 2020, Ragan, Esther, Oliver, Runs, Second measurement with 2 hrs storage time
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Electron cooler was off here. Thus, this measurement is not what we needed.
(in the picture below, it can be seen that the beam is not cooled)
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Thu Apr 2 06:25:13 2020, Ragan, Runs, Template
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beam: 205Tl81+ (no scraping)
energy: 400 MeV/u
storage time: ___ hrs
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Thu Apr 2 07:01:32 2020, Ragan, Esther, Oliver, Runs, Measurement with 4 hrs storage time
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beam: 205Tl81+ (no scraping)
energy: 400 MeV/u
storage time: 4 hrs
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Thu Apr 2 09:21:19 2020, Ruijiu, Runs, 2nd measurement with 2 hrs storage time (repeat)
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Because the electron cooler was not switched on during beam accumulation in the previous measurement, we repeat this measurement again.
(In the picture below, it can be seen that the beam cooled. On right most is the Tl beam and rest are the contaminants.)
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Thu Apr 2 12:52:25 2020, ruijiu, General, setup FRS with 2 g/cm2 degrader.
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| Yuri sets up FRS with 2 g/cm2 degrader (previous one is 1 g/cm2). The ESR is not changed. The contamination should be less now. |
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Thu Apr 2 15:24:15 2020, Ragan, General, How to know whether electron cooling is working
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| For Alle and Kuehler the bottom left status should look like as shown in pictures below. |
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Thu Apr 2 21:03:40 2020, Ragan, Yuri, Sergey, Nikos, Runs, Zero hour measurement (S2:-10/35 mm)
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beam: 205Tl81+ (no scraping, Al ~1g/cm2)
energy: 400 MeV/u
storage time: zero hrs
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Thu Apr 2 21:10:57 2020, Ragan, Yuri, Sergey, Nikos, Runs, One hour measurement (S2:-10/35 mm)
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beam: 205Tl81+ (no scraping, Al ~1g/cm2)
energy: 400 MeV/u
storage time: 1 hrs
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