 Fri Mar 27 19:51:37 2020, Ragan, General, ESR Machine
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By changing the tune to Qx=2.33, Qy=2.36 the momentum acceptance was significantly improved. A variation of the cooler voltage of 10300 V was possible without
beam loss. That corresponds to a momentum acceptance of 2.7 %. That should provide good conditions for longitudinal stacking.
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Fri Dec 7 10:56:04 2018, Jan Glorius, SlowControl, EPICS ioc on raspberry
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We have an EPCIS server (ioc) running on our raspberry (ext-027377). It talks to our MesyTec modules (MSCF shapers, MHV4 high-voltages).
In principal it should be running all the time, but here is the manual how to check/start it:
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Thu Oct 24 15:36:13 2019, Chen, Sidhu, Detectors, Detector installation process 
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[IMG]elog:12/1[/IMG]
[IMG]elog:12/2[/IMG]
[IMG]elog:12/3[/IMG] |
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Wed Aug 5 17:19:16 2020, Rui-Jiu Chen, Analysis, Data structure
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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 12:19:21 2020, Ragan, RuiJiu, DAQ, Change of the polarity of Amplifiers
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Since last night, the signals from the p-side of all the Si pads were seen as negative on picoscope.
The signals from DSSSD, all n-sides of Si pads and CsI were positive which all are in MSCF-5.
Thus, I and RuiJiu, changed the polarity jumpers of MSCF 1,2,3 and 4(all the four jumpers inside the mentioned MSCF) and now hope to see positive signals |
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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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Fri Mar 27 19:59:09 2020, Ragan, General, Beam stacking in ESR is achieved
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Thanks to Sergey and Markus, stacking of primary H-like 206Pb81+ beam in ESR is achieved.
The stacking of the primary beam was established. There is continuous cooling on the injection orbit by stochastic cooling and by electron cooling on the |
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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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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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Sun Apr 5 12:48:58 2020, Shahab, Runs, 2hour measurement parent pictures 6x
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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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Sun Apr 5 10:21:54 2020, Shahab, Runs, 10 hour measurement pictures
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| Schottky pictures from the 10 hour measurement gas target, including the time before gas target. |
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Mon Apr 6 08:37:02 2020, Ragan, Shahab, Pierre-Michel, Runs, 10 hour measurement (S2: 0/35 mm and S6: -20/7 mm) 8x
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beam: 205Tl81+ (no scraping , Al ~1g/cm2)
energy: 400 MeV/u
storage time: 10 hr
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Sat Apr 4 15:59:16 2020, Ragan, Shahab, Alex, Esther, Runs, 0.5 hour measurement (S2: 0/35 mm and S6: -20/7 mm)
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beam: 205Tl81+ (no scraping , Al ~1g/cm2)
energy: 400 MeV/u
storage time: 0.5 hr
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Sat Apr 4 18:29:44 2020, Ragan, Alex, Esther, Runs, 0 hour measurement (S2: 0/35 mm and S6: -20/7 mm)
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beam: 205Tl81+ (no scraping , Al ~1g/cm2)
energy: 400 MeV/u
storage time: 0 hr
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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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Sun Mar 29 13:43:46 2020, , ,
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Mon Mar 30 16:37:53 2020, ruijiu, Analysis,
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