JYFL Accelerator Laboratory

Transcription

1 JYFL Accelerator Laboratory Four accelerators serving international users for basic research, applications and commerical services: K130 heavy ion cyclotron (+ three ECR ion sources and light ion source) (1992) 1.7 MV Pelletron for ion beam analysis and modification of materials (2007) MCC30 light ion cyclotron (2012) Electron LINAC (2015) Contact information:

2 r e u na vi v a 2 0 dip li o n m u a n k a a se te t t una r e n v u a iv a K1 30 yo ke n m uk a n a s e t et tu na Accelerator laboratory Pelletron Commercial applications Medical Reactions ECR MARA RITU *RADEF -Space -Microfilters -CLinac BB2 QB7 K=130 MeV Medical K=30 MeV IGISOL m *RADiation Effects Facility

3 K130 Accelerated elements: p Xe E = Q 2 /A 130 MeV Ion sources: 6.4 GHz ECRIS 14 GHz ECRIS Multicusp (H -, D - ) Upgrade: 18 GHz ECR

4 Operation of K : 6135 h 2016: 5650

5 K130 beam database

6 New 18 GHz ECRIS (HIISI) Motivation: 1. Nuclear physics experiments, especially studies of superheavy elements, would benefit from higher intensities at medium charge states, such as Ar 8+ and Xe 26+ (energy > 5 MeV/u). 2. European space industry and radiation effects community need higher-energy, higher-intensity beams in the future. The ion beam cocktail energy should be increased from present 9.3 MeV/u to about 15 MeV/u. deeper penetration in silicon irradiations in air with possibility to tilt Infrastructure funding (Academy of Finland) + ESA financial support.

7 RADEF, Jyväskylä, Finland New 18 GHz Ion Source HIISI and 16.2 MeV/u heavy ion cocktail Present: The 9.3 MeV/u cocktail used at JYFL. Species marked with have m/q 3.3 and all others m/q 3.7 Autumn 2017: The 12.5 MeV/u, m/q = 3.2 cocktail proposed to be used at JYFL with 24 segment magnets. Spring 2018: The 16.2 MeV/u, m/q = 2.8 cocktail proposed to be used at JYFL with 36 segment magnets In addition, 10 MeV/u 179 Au 54+, LET 94 MeV cm 2 /mg at Bragg peak (@50µm), Full Range 98 µm (SRIM2013)

8 New 18 GHz ECRIS (HIISI) 5000 Argon intensities 500 Quick test: Xe ma Xe ma Intensity [µa] 50 JYFL 14 GHz ECRIS at 1 kw HIISI ( GHz) at 2.3 kw GTS (18+14 GHz) at 2.6 kw VENUS ( GHz) at 4-9 kw Charge state

9 RADEF, Jyväskylä, Finland Proton beams from 0.5 to 52 MeV - Proton beams from 8 to 52 MeV in air - Energy changes with Al-degraders or from cyclotron - Fluxes from 1E3 to 3e8 protons/cm 2 /s - Low energy protons from 0.5 to 8 MeV in vacuum - Energy change using degrader foil and 90 degree dipole magnet - Good energy resolution of the beam (~30 kev FWHM) - Max fluxes depending on energy: 0.5 MeV ~5e5 protons/cm 2 /s 1.0 MeV ~8e6 protons/cm 2 /s 2.0 MeV ~8e7 protons/cm 2 /s

10 RADEF, Jyväskylä, Finland High energy electron accelerator, LINAC - Model: VARIAN clinac 2100 cd - Electron and photon beams - Electron energies: 6, 9, 12, 16 and 20 MeV - Dose rates at maximum in water: 100, 200, 300, 400, 500, 600 and 1000 rad/min - Photons: 6 and 15 MV Bremsstrahlung radiation - Dose rates at maximum in water: 100, 200, 300, 400, 500 and 600 rad/min - Maximum beam size in isocentric point 30x30 cm 2 - Heavily pulsed beam: 1/1000

11 JYFL-PAC Proposal submission: Two deadlines per year: 15 March and 15 September PAC roughly 4 weeks later Decision based on written proposal, no presentations. One dedicated refereee / proposal Voting + discussion PAC members are encouraged to contact spokespersons before the PAC meeting Proposal lifetime 2 years Commercial use not dealt in the PAC (20-25% of all beam time at K130) Program Advisory Committee: Michael Bender, Bordeax, France Jon Billowes, Manchester, UK Bertram Blank, Bordeaux, France (chair) Bo Cederwall, Stockholm, Sweden Fadi Ibrahim, Orsay, France Silvia Lenzi, Padova, Italy + Mikael Sandzelius, Scientific Secretary + Paul Greenlees, JYFL + Ari Jokinen, JYFL Last PAC October 2017

12 PAC on statistics Requested days 2833 Given days 2026 Success rate 71,5% No of proposals 389 Average number of proposals 17 Average number of pending days 383 (today 372 days) The next PAC (Proposal deadline ) 16 proposals: 4 IGISOL 2 reaction studies 1 applied 9 Ritu/gamma/Mara All in all 169 days requested

13 Supported experiments: Code Title of the experiment I195 Laser spectroscopy of scandium isotopes across N=28 I208 The spin, parity and mass of 102 Y and 102m Y I209 I210 I211 The 82 Br/ 82 Se mass difference and solar neutrinos (Project: A=82) New high sensitivity laser spectroscopy at IGISOL-4 Laser spectroscopy of tantalum using optical pumping in an ion cooler-buncher I212 Trap-assisted beta-decay spectroscopy of the very neutron-rich elements around mass A=88 I220 I221 I223 J22 J24 JR134 JR139 JR143 Mass measurements in the vicinity of 78 Ni to constraint core-collapse supernovae models and to study the N=50 and Z=78 shell closures evolution towards the neutron dripline Quantum-state Selective Decay Spectroscopy: Evolution of the 11/2- neutron-hole state along odd-a Cd isotopes (N=77-81) Beta decay spectroscopy of very neutron-deficient nuclei around mass A=110 using JYFLTRAP Towards a more precise measurement of the Q(2+) in 12 C: testing state-of-the-art ab initio theories Lifetime measurements of low-lying states in midshell Te isotopes Resubmission of the experiment JR120: In-beam γ-ray spectroscopy of 184 Pb addendum to proposal JR13 Lifetime measurements of excited states in 163 W89 and 164 W90 Recoil-Decay Tagged RDDS study of extremely neutron deficient Ir-Pt-Au nuclei and Spectroscopy of 171,172 Au First 18 months: 22 exp. supported 84 users supported 9014 hrs beam on target 4632 supported hours (51,4 %) T&S support 77 k (estimated 80 k ) JR144 JR145 JR147 JR148 NRO127 Is 188 Po Prolate Deformed? Onset of deformation in light Ra isotopes Ra Where is the i13/2 orbital in 159 Hf and 155 Yb? Manifestation of triaxiality in 135,136 Nd: chirality and wobbling motion Study of the ternary decay channel induced by shell effects via the reactions 34 S+ 208 Pb and 37 Cl+ 205 Tl S13 S19 S20 Study of high-k states in 254 No using the SAGE spectrometer Spectroscopy of the odd-proton nucleus 249 Md Search for Isomeric States in 250 Fm

14 34 S Bi

15 UNIVERSITY OF JYVÄSKYLÄ Renewal in Nuclear Spectroscopy MARA and JUROGAM3 Opens a new region of nuclear chart for study Probe different aspects of nucleon-nucleon interaction Flexibility in switching experimental set-up

16 UNIVERSITY OF JYVÄSKYLÄ New frontiers in mass measurements with FIRI-funded instruments MR-TOF AT JYFLTRAP (TEAM 1) AND MARA-LEB (TEAMS 1-3) Fast method shorter-lived nuclei! MASSES Wolf et al., Int. J. Mass. Spectrom. 349 (2013) 123 PURIFICATION PI-ICR MASS MEASUREMENT TECHNIQUE AT JYFLTRAP (TEAM 1) = To be commissioned at JYFLTRAP in 2017 = + = 2 40 times better resolution Shorter excitation times Requires fewer ions Eliseev et al., Phys. Rev. Lett. 110 (2013)

17 JYVÄSKYLÄN YLIOPISTO Phase dependent cleaning Isomerically clean beams available with unprecedented resolving power Shown: maximal 180 degree separation Scale this: For A/q = 100, 50 kev isomer 45 deg phase difference Need 200 ms 250 ms 2 10 Ultimately: few 10 kev separation possible g.s. of 127 Cd delivered to TASISPEC

18 Proof of principle in JYFL ) Laser polarization 2) First D measurement LPCTrap setup Ion cooler and buncher Penning trap MR ToF MS beam Pulse down electrodes LPCTrap IGISOL 4 : I. D. Moore et al., Nucl. Instrum. Meth. B, 317(2013)208 10/10/2017 INPC 2016, Adelaide

19 UNIVERSITY OF JYVÄSKYLÄ Archiving percentages in 2015 and ,00% 70,00% 60,00% EU goal in % 50,00% 40,00% 30,00% 20,00% 10,00% 0,00% JYX open access repository Jyväskylä University Digital Archive

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22 Thank you for your attention!