Chairperson: Maria J. Borge
Scientific secretary: Thierry Stora
Participants : Tim Giles, Roberto Losito, Richard Catherall, Kieran Flanagan, Elisa Rapisarda, Tania de Melo Mendonca, Franck Wienholz, Magda Kowalska, Thierry Stora, Valentin Fedosseev, Maria Garcia Borge, Alexander Gottberg, Pierre Delahaye
Excused: Klaus Blaum, Yorick Blumenfeld, Piet van Duppen, Karsten Riisager
Presentations and agenda there
1.- Introduction and Agenda
Our colleague A. Gottberg is taken over a position in TRIUMF. The Group proposed that A Gottberg would join as a representative of TRIUMF.
2. TISD report
Data were presented on the stability of standard UCx targets, and comparison of different prospective materials High Density UC targets, nanostructured UCx targets. To date, sub micron SiC, nanostructured CaO, nanostructured LaCx, nanostructured TiCx and carbon nanotubes targets have been designed and tested at Isolde.
8B beams produced from carbon nanotube targets, SF6 reactive gases and a VADIS ion source were tested. About 300/muC isotopes providing a 511keV gamma lines were identified on A=8. Unfortunately identification with Isoltrap could not be achieved. Further tests online are requested.
The status of the LIEBE project was provided. It is a high power target development operating a circulating lead bismuth eutectic loop and a diffusion chamber to improve the release of exotic radioisotopes. Several institutes are collaborating on the project.
The VADLIS project was then presented. The laser ion source is used in combination with the VADIS cavity. This can be used with a pulsing anode to suppress contaminants, to ionize noble gases.
The online tests of a molten salt target confirmed the good performance in the production of 11C beams as CO molecular beams.
3. New beam request
The requested list is the following:
31Ar from CaO target : no further development necessary.
37K : nanoTiC target to be tested in 2014.
56Co : The beam and purity could be provided with a VADIS source or in the VADLIS mode.
114-118Ba : Online tests of nanoLaCx targets and reactive SF6 injection to produce BaF+ ions.
150-152Cs . tests with nanoUCx will be done in 2014.
76-79Cu. a new neutron converter would improve the intensity. However the project is on hold.
131-136Sn . to be tested
129-132Cd beam can be assessed with UCx, quartw line, neutron converter.
211-212Po, 211-213Tl : UCx target, LIST and quartz line should be developped.
46-48Ar Sulfur molecules were observed in the beam. further tests should be undertaken with nanoUCx-VD7.
Since the last INTC, the following beams need TISD efforts and join priority 1:
n rich Sc beams, Po beams, molecular break up of HfF+ for 184Hf beams.
The following list receives priority from the Group:
8B for confirmation
11C is now very strong
9C is produced from nanoCaO VD7 in good yields. however some scatter is to be expected still.
The LIST m eventually combined with quartz line n conv, and negative ion beams in June July 2015.
The LIEBE project is now foreseen for the start up in 2016.
If online tests confirm the good preliminary data, the production upscaling needs to be addressed.
Molecular beams and the new neutron converter should progress if resources are permitting.
4. MR TOF MS
The device has approximatively 50%. The trap capacity is of 1e5 ions. At present, light ions can t be bunched. H instead of He would improve that performance. At present, bunch of 100ns is used, shifting to 500ns would request x5 longer separation times. For 1 mus bunching, m/dm =100000. Ion trapping lifetime is 200ms at 1e-9mbar, and 10ms at 1e-8mbar. Finally, the device could be used as an energy meter.A budget of ca 100kCHF would be reauired, and integration in beam lines at 90 deg to gain space.
5. Beam line optics
simulations were presented to understand is the 9mm vertical mismatch could be preserved for HIE ISOLDE, or if realignment is requested. Simulations were done with diverse representative emittances. It is seen that the vertical mismatch can t be controlled, the horizontal mismatch can be accepted.
It is worth mentioning that tests with the autotuning routine developped by T. Giles are working very nicely.
6. Tape station
A conceptual in house desing is presented. it comprises a in beam position, one position for a 4pi beta detector, and one for a gamme detector. The Group recommends to add an additional versatile detector position.
The design is based on 3 independant boxes for the wheels and the tape system. A test stand has been set up to develop the demonstrator. So far, excellent reproducibility with 100ms tape movement is achieved. A prototype for offline testing should be available for mid 2015. A last important item consists in the implementation of a segmented collimator. S. Marzari will join the team to provide mechanical design expertise.
7. Yield database
The Isolde database has been updated. The graphic interface should be restored first quarter 2015. The Group asks if the unpublished data could be made available. Until now the rule is to publish before making these data available. The Group therefore propses that a CERN report be made to be able to publish these data.
8. Next meeting
The next GUI meeting is foreseen on 9th February (Note added after the meeting : this has been shifted to 12th February)
Minutes by Thierry Stora