No Comments to the minutes of the ISOLDE Physics Group Meeting of the 28.11.2012:
GPS:
- On Monday 26/11, removal of target #497 CaO Helicon and installation of target #496 with 44Ti source from PSI;
- From Tuesday on, setting and tuning of the target and REX with stable beam.
- Difficult beam setup due to many molecular beams ionised. Mass analysis behind REX-trap helped.
- Power fuse on REX 2nd line jumped when the 44Ti chamber and equipment was connected. The problem was resolved by redistributing the connections to other sockets.
- The ion source anode voltage dropped several times. This is probably caused by ionized impurities which coat the anode.
- On Friday afternoon the situation stabilized: no trips in the anode voltage, and beam was given to the users.
- Run was rather smooth over the weekend, although yields were dropping; it stopped on Monday morning and will resume next Monday.
HRS:
- From last Wednesday to Friday, UC-Re target #492 was used in the evenings and nights for solid state physics collections.
- During daytime RABBIT irradiation took place;
- During the weekend, target cool-down;
- On Monday target change: 'new' target #463 Pb-VADIS - re-used from last year.
- From Tuesday on, stable beam tuning to TAS and LA1.
- Vacuum problem along RC310 / RC320: cannot open the valve to TAS setup because of wrong readout of the pirani RC320_VGR1. On the spot solution: the readout was forced to 10-6mbar to allow the opening of the valve.
- Transmission to TAS with 208Pb seemed very low, probably due to a problem of diagnostics (FC not reacting to commands).
- From Wednesday night, 186Hg beam to TAS. This molten lead target has negligible Tl contamination. Only trace was observed at the TAS setup.
REX:
- Running from Friday on 44Ti13+. The energy of the beam was changed on Saturday to 2.1 MeV/u (from 2.85MeV/u which turned out to be too high for the experiment);
RILIS
Working on Mn for solid state physics collection.
Thanks to the RILIS team for being very flexible, allowing for extra beam-time.
Presently in stand-by, waiting for 11Be
PHYSICS AND SCHEDULE
- Last week LA1 and LA2, solid state physics: Mn collection/diffusion for tests of fibres and solar cells; and emission channelling;
- Weekend: 44Ti for astrophysics – beam at 2.1 MeV/u energy. Next week, data at another energy will follow.
- This week TAS: gamma spectrum on A=186 did not show Tl. Yield for 186Hg: 3.95e7 ions/uC WG470 out), calculated from the 112 keV gamma line (63% branching ratio). The aim is to determine the shape of 182,184,186Hg. (shape-coexistence)
SAFETY:
- After the long-shutdown all the permanent setups need safety clearance; those missing it (TAS, NICOLE, SCATTERING chamber) will need to prepare one.
AOB:
- Reminder: The ISOLDE Hall Extension has to be empty by mid-February. Note that this is a new deadline. Previous one was first week of January.
- Magda and Maria are working on a plan for time limited tasks to be given to Julien T. If you have any request please tell them as soon as possible. Julien will be very busy in the incoming months, so it is needed to book his help in advance;
- Some important dates:
o Next INTC meeting dates are: 26-27 June and 21-22 October. Deadlines for abstracts submission four weeks in advance. The committee will accept LoIs and proposals for low-energy physics and first-stage HIE-ISOLDE (5.5 MeV/u);
- Next visits at ISOLDE:
- 08th January: VIP visit of Norwegian Research Council;
- 12th January: students from UK, ref. P. Walker (two guides are needed);
- 29th January: students from Orsay master programme in nuclear physics – they are potential PhD students (3-4 guides needed);
No seminar this week. The movie about the CATHI programme, that was expected to be projected, has not yet been released.
Seminar next week: Andreas Knecht, "The Fukushima accident: from the tsunami to radiation monitoring across the globe" http://indico.cern.ch/conferenceDisplay.py?confId=209887
Minutes taken by ER