Status of the HIE ISOLDE PROJECT. Karl Johnston EP-Dept, CERN
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1 Status of the HIE ISOLDE PROJECT Karl Johnston EP-Dept, CERN
2 ISOLDE Facility ISOLDE is the CERN radioactive beam facility Nuclei produced via reactions of high intensity high energy proton beam with thick and heavy targets. Provides low energy or post-accelerated exotic beams Around 50 experiments per year targets BelgiumCERN Denmark Sweden Slovakia United Kingdom Finland France Germany Ireland Norway Poland Greece Italy India Romania Spain South Africa
3 protons ISOLDE: Research with Radioactive Nuclei Nuclear physics and atomic physics Fundamental interactions Decay spectroscopy Nucleontransfer reactions neutrons Transition probability halflife Ion traps decay pattern Spin, parity radius Coulomb excitation mass e-m moments Techniques: all available at ISOLDE Laser spectroscopy Betadetected NMR Material science and life sciences Nuclear astrophysics 3
4 Decay spectroscopy (IDS, TAS,..) Coulomb excitation (MINIBALL+ CD + SPEDE) Transfer reactions (T-REX, Scattering Chamber) Electromagnetic Properties (COLLAPS, CRIS, NICOLE) Polarized Beta-NMR (VITO, COLLAPS) Masses (ISOLTRAP) Fundamental Interactions (WITCH) Applications: Solid state (Collections) Life Science (collections & VITO) MEDICIS First Beams Oct 2015 Scattering Chamber NICOLE MINIBALL T-REX, SPEDE IDS WITCH TAS VITO CRIS ISOLTRAP HRS COLLAPS ISCOOL GPS collections Travelling setups Post-accelerated Exps (5.5 MeV/u), Low Energy (30-60kV) Exps, Machine elements
5 Highlights from ISOLDE RILIS: Ionisation potential of Astatine S. Rothe et al, Nature Communications 4 (2013), neutron separation energy (MeV) Least abundant element on Earth Series of Rydberg states Ionisation Potential = 9,31751 (8) ev REX-ISOLDE + MINIBALL : Octupole deformation in 220Rn and 224Ra L.P. Gaffney et al, Nature 497 (2013) 199 Candidates for searches for permanent EDMs: Radiums-223 and promising 4p 2 P ½³ nm 4s 2 S ½ ISOLTRAP: Mass of Ca & 3-body forces F. Wienholtz et al, Nature 498 (2013), Ca Level scheme for resonance excitation F F counts/proton pulse Mass models Hyperfine structure spectra COLLAPS: Radii of Ca R. Garcia-Fdez et al, Nature Phys Feb 2016, 594 d<r 2 > [fm 2 ] N Exp NNLO sat UNEDF0 DF3-a ZBM2 Nuclear theory } Neutron number Relative Frequency (MHz) Ca 42 Ca 44 Ca 46 Ca 48 Ca 50 Ca 52 Ca
6 Post-accelerator: REX-ISOLDE different Universities Approved in 1994 as an experiment: Radioactive EXperiment.. First 2.2 MeV/u in Oct 2001 Upgrade to 3.1 MeV/u completed in 2004 REX Universal post-accelerator from He to Ra (A=224) > 100 different beams In 2006 a new hall extension in preparation for HIE-ISOLDE 1 Nature, 12 PRL, 6 PLB to A/Q = Heidelberg + GSI, Darmstadt Stockholm Mainz
7 Physics REX Coulomb excitation with Miniball: collectivity versus individual nucleon behaviour ,186,188 Hg Probing shape coexistence 222,224 Ra ; 220,222 Rn Probing Pear Shape Gaffney Nature Sn; Cederkäll, PRL ,108 Sn, Cederkäll, PRL Se, shape coexistence, Hurst PRL Sr, 88 Kr, 92 Kr, PRL ,76,78,80 Zn 122,124,126 Cd 138,140,142,144 Xe 140,148,150 Ba 67,69,71,73 Cu, Stefanescu et al., PRL ,70 Cu, isomeric 68 Cu, Stefanescu, PRL ,31,32 Mg, Niedermaier PRL2005, H. Scheit Evolution of collectivity around 132 Sn Probing large scale shell model, Van der Walle, PRL2007
8 Transfer REX Few-nucleon transfer reaction studies: single-particle properties 30 Mg(t,p) halo 32 and Mg (N=20) cluster structures t( 72 Zn,p) 73 Zn Hellgartner t( 44 Ar,p) 46 Ar Nowak 28 d( 66 Ni,p) 67 Ni Diriken t( 66 Ni,p) 68 Ni Elseviers d( 78 Zn,p) 79 Zn Orlandi d( 30 Mg,p) 31 Mg, K. Wimmer, PRL 2010 Light nuclei, halos & clusters 20 d( 8 Li,p) 9 Li*; Tengborn PRC (2011) d( 9 Li,p) 10 Li d( 11 Be,p) 12 Be Johansen PRC (2013) 8
9 The HIE-ISOLDE project (2010 -) Energy: MeV/u Intensity: x4 in power Beam Quality Strong external contribution for R&D and Machine Purity & Beam Quality ISOLDE 9 9
10 Physics at HIE-ISOLDE The new energy window gives the opportunity to address new physics questions: Isospin symmetry Magic numbers far from stability Collectivity versus Single Particle Shape Coexistence Reaction for nucleo-synthesis studies 10
11 HIE-ISOLDE Opportunities: Reaction Physics Optimum energy (d,p), ( 3 He, ), ( 3 He,d), (d,n), transfer ( 3 He,p), (d, ), (p,t), (t,p) Few-nucleon transfer Unsafe Coulomb excitation Compound nucleus reactions Coulomb excitation, g-factor measurements Single-particle configurations, r- and rp-process for nucleosynthesis pairing Structure of neutron-rich and proton-rich nuclei High-lying collective states Exotic structure at drip line Nuclear collectivity and singleparticle aspects MeV/u 5-10 MeV/u 8 MeV/u 6-8 MeV/u 5 MeV/u 3-5 MeV/u (p,p ), (p, ), nucleosynthesis 2-5 MeV/u
12 Instrumentation Miniball + T-REX (upgrade planned) : COULEX + Transfer. (2016) C-REX Multipurpose reaction chamber CORSET chamber for fusion-fission reactions SPEDE: added to Miniball+T-REX ISOL Solenoidal Spectrometer: ISS TSR) MAYA/ACTAR: resonant scattering + transfer Zero type spectrometer TSR storage ring 12 magnetic field incoming beam gas volume amplification zone electric field segmented plane
13 Installation of first Cryomodule in place for 4.3 MeV/u 2nd of May km/h
14 HEBT installation XT01 XT02 XT03 XT03: No elements but full infrastructure in place S. Maridor 14
15 (re-) Installation of experiments Miniball frame the 4 th of May 8th of May
16 Scattering chamber on XT02
17 1 st beam delivered: 22 nd October st beam of 74 Zn 25+ to HIE-ISOLDE Afterwards on 76 Zn HOWEVER: Special beam permit: operation of cryomodules only during working hours, and not during weekend, power coupler unstable and was heating after extended operation. Also 9-gap amplifier non-optimal. Stability of the lasers allowed for night-time operation of Zn opportunistic REX (2.85MeV/u) run during off-hours. Heavy load on the operators but greatly appreciated by the users. Demonstration of machine, but impractical for normal useage.
18 First Coulex experiment at HIE ISOLDE 10/ Zn(10 6 pps) Pt 4.0 MeV/u (~ 5 hours) 2.8 MeV/u (~ 16 hours) 196 Pt Zn on 196 Pt at two different energies 74 Zn Zn ? 74 Ga Cont. 74 Zn Zn (courtesy of Piet van Duppen) Piet Van Duppen
19 First Coulex experiment at HIE ISOLDE 10/ Zn on 208 Pb at 4.0 MeV/u 74 Ga Cont. 74 Zn Zn (courtesy of Piet van Duppen) Piet Van Duppen
20 HIE ISOLDE (2015) Experiment continues this week (since 19:15 yesterday evening) with 78An and 4.3MeV/u 74 Zn Louchart PRC 2013 Van De Walle PRL 2007 Shiga PRC2016 Illana Sison, Zielinska Illana to be Sison, published Zielinska to be published (courtesy of Piet van Duppen) Piet Van Duppen
21 Installation work: 2016 Removal of original CM for repair. Installation of 2 nd CM RE-installation of original CM Difficult cooling down period, many issues with cryoplant, H20 pollution/air leaks/compressor (4 week delay) Problem with two cavities. Short circuit on solenoid in CM1, but had been dealt with. HOWEVER: no heating of RF coupler 24/7 operation
22 2016 REX Start-up Consolidation of the vacuum cryo compressor pumps REX machine now under vacuum (RFQ, IH, 7- and 9-Gap structures) New 9-Gap Amplifier has been installed 22
23 Physics campaign for 2016 Coordinator s burden: 42 experiments on the books 855 shifts outstanding Popularity growing: new proposals coming in all the time! LS2 ( ) staring us in the face.. Assuming a stable machine (i.e. 24/7 operation). Define priorities for 2016 Conclusions from HIE-ISOLDE users workshop 1st February approved proposals ask for beam time in 2016 won t be able to serve more than 7 - Full energy range of accelerator up to 6.0 MeV/u 5.5MeV/u - Mass range from 18 N up to 228 Ra intermediate masses - MINIBALL configuration for Coulomb excitation and transfer reactions will be installed for 2016 campaign going to go with C-REX - Combination with SPEDE is available after successful stable beam commissioning in summer 2016 tests continuing - High number of experiments should be provided to user community 6 possible (4 week cooling delay) Beams 2016: chosen for intensity, and ramping up of A/q etc 110Sn, 80Zn, 142Xe, 132Sn, 9Li, 66Ni
24 110 Sn 4.5MeV/u: Sept 9 th week of operation exceeded 2015 running hours (~ 3 weeks)
25 Preliminary data from 142Xe for IS548 Courtesy of corinna Henrich
26 Celebration of end of Phase I: 28 th September 2016
27 Phase 2: Assembly of CM3, to be installed in 2017
28 Phase 2: Assembly of CM3, to be installed in 2017
29 Summary and plans for 2017 Ongoing commissioning of ISOLDE solenoid spectrometer. 1 st experiment accepted. Installation on 2 nd beamline in winter 2017 along with completion of 3 rd beamline HIE ISOLDE phase one complete. First programme of experiments for 2016 now underway. In spite of some downtimes, producing interesting new data. 3 rd Cryomodule to be installed in Spring 2017 Aim to maximise the physics campaign in 2017.
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