 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
|
beam: 205Tl81+ (no scraping , Al ~1g/cm2)
energy: 400 MeV/u
storage time: 10 hr
|
|
Mon Apr 6 09:34:58 2020, Shahab, Runs, Pictures from one and a half hour measurement
|
| cheers! |
|
Mon Apr 6 14:17:54 2020, Yuri, Shahab, Runs, FRS valves
|
We saw reduction in ESR beam life. It turned out that FRS has opened valves and venting caused us reduction of the quality of vacuum in ESR leading to beam
loss. We manged to closed GEE5VV so that now beam is stable somehow.
|
|
Mon Apr 6 14:57:04 2020, Shahab, Runs, cooler down
|
| cooler component GECEBG2T again had to be reset. |
|
Wed Jan 29 10:42:42 2020, Shahab, General, Gas target control with the new control system event
|
Many thanks to Sergey and Nikos we have tested the connection of the new control system for turning on and off of the gas target.
|
|
Fri Feb 21 11:30:52 2020, Laszlo, General, Shift plan
|
e127: https://docs.google.com/spreadsheets/d/14m8WcCq1erx6HqWJRK7TLbCx121IkjqGa5l-frf4YjI/edit#gid=0
e121: https://docs.google.com/spreadsheets/d/10MUzA5-Ilf2WzCyNj8u_KSG6yzPg0e4vtZGGPFB3K-k/edit#gid=0 |
|
Thu Mar 26 17:21:40 2020, Ragan, General, Stochastic cooling
|
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. |
|
Fri Mar 27 13:02:07 2020, Ragan, General, Stochastic cooling
|
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. |
|
Fri Mar 27 13:04:17 2020, Ragan, General, FRS Settings until now
|
Yuri and Helmut have been extensively involved in tuning and optimizing of the FRS.
26th March, 2020 (Evening setting):
|
|
Fri Mar 27 13:40:54 2020, Ragan, General, NTCap start and shutdown information
|
| The attachment contains information on how to start and shutdown NTCap and bridge computer. |
|
Fri Mar 27 19:51:37 2020, Ragan, General, ESR Machine
|
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.
|
|
Fri Mar 27 19:59:09 2020, Ragan, General, Beam stacking in ESR is achieved
|
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 |
|
Fri Mar 27 20:05:43 2020, Ragan, General, H2 gas jet ready
|
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 ) |
|
Fri Mar 27 20:52:31 2020, Ragan, General, Plans for the measurement with 206Pb81+
|
We plan to measure:
1. Lifetime of H-like 206Pb81+ beam with two electron cooler currents:
|
|
Sat Mar 28 01:14:19 2020, Ragan, General, Cross-section for capture and ionisation of 206Pb81+ with H2 target
|
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. |
|
Sat Mar 28 11:07:49 2020, Ragan, RuiJiu, Tino, , General, Nikos is changing gas jet target
|
| The gas jet target is now being changed from H2 to Ar by Nikos. |
|
Sat Mar 28 11:20:10 2020, Ragan, RuiJiu, Mei, Yuri, Tino, General, Reducing beam intensity in ESR
|
| Yuri reduces beam intensity in the ESR to reduce the countrate on the detectors. |
|
Sat Mar 28 11:28:11 2020, Ragan, RuiJiu, Mei, Yuri, Tino, General, ESR open
|
| ESR is open now |
|
Sat Mar 28 13:09:11 2020, Mei,Yury, Tino, Ragan, Ruijiu, General, Shift plan
|
From Yury,
For now, measure the beam life time with 3 different electron current in the e-cooler,i.e. 200mA(default), 10mA, and 20mA. For each current, 4 sets of |
|
Sat Mar 28 14:19:24 2020, Ragan, RuiJiu, Mei, Yuri, General, Instructions to change the electron cooler current
|
Attached are the instructions on how to change the electron cooler current for the lifetime measurements of 206Pb81+ beam (interaction with residual gas
and electron cooler). |