 Mon Apr 6 05:28:55 2020, Ragan, Laszlo, Nikos, Runs, Zero 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 Apr 6 05:43:50 2020, Ragan, Laszlo, Nikos, Runs, One and a half 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: 1.5 hr
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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 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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Sat Apr 4 17:32:01 2020, Ragan, Alex, Esther, General, No beam in ESR
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The beam is coming from SIS but doesn't arrive in ESR because the quadrupole magnets in ESR have failed.
Update (18:01): Problem has been resolved. |
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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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Sat Apr 4 18:57:49 2020, Ragan, Alex, Esther, General, Timing problem with SIS & ESR and problems with stacking
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There are further problems with beam stacking in ESR. It works occasionally but keeps failing.
There is also timing problem between SIS and FRS. |
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Sat Apr 4 19:55:37 2020, Ragan, Alex, Esther, Runs, Failed measurement...Ten hour measurement (S2: 0/35 mm and S6: -20/7 mm)
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FAILED - measurement was stopped by sudden loss of the beam
beam: 205Tl81+ (no scraping , Al ~1g/cm2)
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Sun Apr 5 15:28:35 2020, Ragan, Alex, Esther, Runs, Four hour measurement (S2: 0/35 mm and S6: -20/7 mm) 7x
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beam: 205Tl81+ (no scraping , Al ~1g/cm2)
energy: 400 MeV/u
storage time: 4 hr
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Sun Apr 5 20:23:02 2020, Ragan, Alex, Esther, Runs, Half-hour measurement (S2: 0/35 mm and S6: -20/7 mm) 7x
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beam: 205Tl81+ (no scraping , Al ~1g/cm2)
energy: 400 MeV/u
storage time: 0.5 hr
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Sun Apr 5 21:50:02 2020, Ragan, Alex, Esther, Runs, Half-hour measurement (S2: 0/35 mm and S6: -20/7 mm) 7x
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beam: 205Tl81+ (no scraping , Al ~1g/cm2)
energy: 400 MeV/u
storage time: 0.5 hr
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Sun Apr 5 23:28:01 2020, Ragan, Alex, Esther, Runs, One-hour measurement (S2: 0/35 mm and S6: -20/7 mm) 7x
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beam: 205Tl81+ (no scraping , Al ~1g/cm2)
energy: 400 MeV/u
storage time: 1 hr
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Thu Mar 26 17:21:40 2020, Ragan, General, Stochastic cooling
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1) From SIS, 206Pb67+ @401.17 MeV/u goes to FRS where only SEETRAM is placed in the target area to strip off 206Pb67+ to get 206Pb81+.
2) There is 206Pb81+ (H-like primary beam) inside ESR at 400 MeV/u.
3) The ESR team is now trying Stochastic cooling with 206Pb81+ beam at 400 MeV/u. |
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Fri Mar 27 13:02:07 2020, Ragan, General, Stochastic cooling
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1) ESR team is successful with the Stochstic cooling of primary H-like 206Pb81+ beam @400 MeV/u.
2) Now, they are trying for stacking of the beam. |
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Fri Mar 27 13:04:17 2020, Ragan, General, FRS Settings until now
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Yuri and Helmut have been extensively involved in tuning and optimizing of the FRS.
26th March, 2020 (Evening setting):
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Fri Mar 27 13:40:54 2020, Ragan, General, NTCap start and shutdown information
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| The attachment contains information on how to start and shutdown NTCap and bridge computer. |
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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 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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Fri Mar 27 20:05:43 2020, Ragan, General, H2 gas jet ready
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Thanks to Nikos, stable H2 gas jet target with 10^14 particles/cm^3 is ready.
(More information can be found on: https://ulpc24.gsi.de/cgi-bin/jet.py?gasart=Helium ) |
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Fri Mar 27 20:52:31 2020, Ragan, General, Plans for the measurement with 206Pb81+
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We plan to measure:
1. Lifetime of H-like 206Pb81+ beam with two electron cooler currents:
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