 Sat Mar 28 15:23:05 2020, Alex, Ragan, Mei Bai , General, beam lifetime measurement 
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We see two species in the Schottky spectra during the beam lifetime measurement without the target. The one (probably the primiary beam) is significantly
better cooled than the other.
So, we were wondering what is the other beam? Maybe the recombined ones? |
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Sat Mar 28 16:09:50 2020, Alex, General, no beam in the ESR
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Ragan and Ruijiu went in the ESR for short time to fix something with the slow control of the silicon detector.
After this, there is no beam in the ESR. |
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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 |
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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 20:32:20 2020, Ragan, General, Template for Pb halflive measurement
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beam:
energy:
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Sun Mar 29 21:55:47 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 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 01:43:58 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 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 06:34:47 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 12:12:25 2020, ruijiu, General, Instruction of NTCAP for shift person
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To start a new run with NTCap, we need to retart NTCAP.
1. Stop labview program.
2. Start labview program and start a new run. |
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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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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 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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Fri Apr 3 04:36:21 2020, Ragan, Pierre-Michel, Dima, General, Electron cooler problem which was then solved
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04:09 Electron cooler had some problem when we were stacking for 2 hours measurement.
04:20 GECEBG2T and GECEBG5T were Reset and then Switched on. Electron cooler started working again |
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Sat Apr 4 03:06:12 2020, Ragan, General, Instructions if electron cooler goes off during long storage time measurements
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| Please read the attachment. |