Target and Ion Source Development

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Presentation transcript:

Target and Ion Source Development Thierry Stora

Beams at ISOL facilities* GANIL-SPIRAL I CERN-ISOLDE (74 elements) (7 elements) ISAC-TRIUMF (67 elements) GANIL-SPIRAL I (&II) * 1 development is ~ 2-5 man.year effort if the technology is within scope HIE-ISOLDE (1st proposals to INTC in 2013 Already many more)

ISOL Beam intensity and availability Cross section Ionization Efficiency Release Efficiency I = F s N erelease eion RIB intensity: Material science (nanostructured targets, molten salts,…) Chemistry (adsorption enthalpy, molecule formation,…) Ion sources (cathode, plasma,…) Targetry (secondary reactions molten metal shower,…) thickness Target Proton beam Intensity

Beam developments in the past 8 years 1st 8B ISOL beams BF2+ from nanotubes Molten salt Target 11C as CO+ X5 30Na Re ion source X10 20,21Mg sub-m SiC 9,17C as CO+ Helicon Ion source 70+Ni beams Source From PSI 44TiF3+ Nano Y2O3 48Cr x250 Nano UCx 80-82Zn,130Cd Purification with quartz (Hads)‏ 9Be(n,a)6He Nano CaO Target (Ar) 1st Fe Beams X5 VADIS 208Pb(t,3p)208Hg Au beams by laser ionis. X3-10 VADIS Ion source (72Kr,229Rn) 1st beams@JAEA New Neutron converter Purific. of Fr, Ra with LIST Trap ThO, Negative ion sources Purification of lanthanide beams 140Nd, 140-142Sm: GdB6 ion source cavity + RILIS

Recent results Negative beams : Offline efficiencies 2015: Negative ion source prototype (GdB6 tub ion, Menna et al. NIMB, 266(2008) 4391) Offline efficiencies 2015: e (Br-,I- ) = 17% @1700C with some questions remaining Online TISD with Nb535 and ThO540 targets, starting this week Y. Martinez, J. Ballof, T. Mendonca

Recent results LIEBE (Liquid Lead Bismuth target loop for EURISOL) Prototype construction starting (detailled drawings) Offline tests foreseen end 2015 Online tests foreseen in 2016

Recent results 8B beams TaFx+ ion beams 8B Positron + 2 Alphas Decay: Target unit #499: Target material: Carbon nanotubes (MWNCT), ρ=0,43 g/cm3 Standard Ta container, cold transfer line, VADIS ion source SF6 in container,(0,37*10-4 mbar*l/s, p(SF6)~1-2 bar) Release of 8B & ISOLTRAP’s MR-ToF: No 8BFn+ (n=1,2,3) or Oxyflourines detected Positron activity on A=8 corresponds to 3*102 1/uC Proof that activity originates from 8B still pending Target unit #513 : (Same characterisics as #499, higher SF6 injection: 1 10-4 mbar*l/s, ) Release of 8B & LA1 (Tengblad et al.): 8BFn+ (n=1,2) detected this time ! Positron activity on A=46 corresponds to 3104- 105/uC (~1nA stable contaminant also detected) keV 8B Positron + 2 Alphas Decay: blue: this work black: Winter et. al, 2008, PRC HPGe Si detector Target 8BFx Ch. Seiffert, J. Ballof, M. Delonca, B. C. Gonsalves, W. Hwang, R. Lica, M. Madurga Flores, T.M. Mendonca, J. P. Ramos, T. Stora, O. Tengblad, D. Torresi, K. Riisager, M. Borge, M. Owen,et al

Recent results Nanomaterials New UO2 powder batch : 1st unit UC539 T. Mendonca et al. NanoUCx+MWCNT (ActILab, ENSAR) has been operated at IPNO- ALTO in Jun 2015 Good and stable yields of n-rich Rb and Cs (99,100Rb, 148Cs) A. Gottberg et al. 37K beta decay for IS527 Delivered stable 1e6pps 37K (>8e6 was expected) J.P. Ramos et al.

Organization Developments discussed 1x/year at GUI meetings (New website under construction): http://isolde.web.cern.ch/group-upgrade-isolde-gui Priorities (old): priority I : approved INTC proposals asking techn. dvlpt + missed scheduled beams Priority II : LoIS Priority III : R&D New Priorities: Priority I : aproved INTC LoI`s asking for techn dvlpt + missed scheduled beams Priority II : R&D

Target evolutions In the past ten years, the developments have been such that any of the Target and Ion Source units contructed in 2016 won’t be identical to those that were used in 2006.

Team & Collaborations E. Barbero, B. Crepieux, M. Owen, S. Marzari: (STI-RBS) Target Production, infrastructures TISD team: Dr. T. Mendonca : Senior fellow, High power targetry (salt target, LIEBE project) : Jul 16 (4 months maternity leave) (Dr.) M. Delonca : LIEBE project :  Feb 17 J. Ballof : molecular beams (8B, carbonyl of refractory elements) :  Dec 17 J. P. Ramos : Target nanomaterials (EPFL) :  Oct 15 +6months Y. Martinez (KULeuven) : 50%  2018 WJ Whang (RISP) :  Jul 15 GANIL, IPNO, INFN, (ENSAR2 ?), + TRIUMF, JAEA, Mainz ITN (neutronics, UCx) EPFL, Aveiro, (materials) ESS, CEA, SCK●CEN-Myrrha, SINP, PSI (LIEBE project) R. Augusto (Fluka team)