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ISOL-SRS project
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Storage ring at ISOLDE Beam quality Luminosity
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International Collaboration
Eur. Phys. J. Special Topics 207, (2012) MPI-K Heidelberg: TSR, technical input to install and commission. CERN: New TSR building and infrastructure (15 MCHF). Research Board approved installation and included on CERN-MTP. UK: Detector array for internal spectrometer. External (HELIOS-like) spectrometer. Total project costs awarded, including manpower, is £4.8M (£3.2M “new money” mostly for materials), shared between Daresbury, Liverpool & Edinburgh. (Includes contingency) Universities of Aarhus and Lund: In-ring gas-jet target.
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In-ring DSSD System (Edinburgh-Daresbury) For in-ring (d,p), (p,d) and (3He,d) transfer studies of astrophysical resonances UHV mounting; 100 x 100 mm; 0.25 – 1mm strips; AIDA-type readout
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External spectrometer (Liverpool-Daresbury) for high resolution studies of nuclear reactions on heavier nuclei outside the ring HELIOS concept 1 m uniform field detector 1m uniform B field e.g. Q-value = 1.01 Elab (MeV) z (cm) for 10 MeV/u 132Sn(d,p) 4 x 125 x 25 mm; mm strips; R3B-type readout
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Q-value resolution EXTERNAL SPECTROMETER: d(24Ne,p)25Ne @ 10 MeV/u
With HIE-ISOLDE beam: 38 keV With cooled TSR beam: 22 keV INTERNAL SPECTROMETER: 10 MeV/u Cooled TSR beam: 29 keV
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Acceptance and luminosity
Internal: Recirculation advantage for light species; any pure light gas, e.g. helium-3, can be used as target. External: Generally larger coverage in scattering angle, important for establishing angular distributions.
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KEY PRIORITY of ISOL-SRS is to develop spectrometer systems for the TSR storage ring to fully exploit the range of radioactive beams from HIE-ISOLDE.
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MRI magnet: Oxford OR66 4T, ActiveShield technology MRI magnet available (type OR66) Large bore of up to 90 cm diameter, ~2m long Magnet comes with power supply, cold-head and compressor, and other equipment and should be operational Installation requires cool-down (6500 litres of LHe, ramping and shimming (passive and active shimmming) Specifications:
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Layout
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OR66 magnet fringe field Space allocation for magnet assumed to be 10 x 10m
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Gantt chart
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Planning Install at CERN first quarter of 2019
LS (if delayed by 1 year) Exploitation with direct HIE beams Exploitation with TSR beams from 2023
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Re-phrase of D. Jenkin’s ISCC slide
External spectrometer will be deployed in ISOLDE hall Funding for magnet (~£250k) needs to be found (possibility of capital funding in UK). Gas-jet target will be picked up by Scandinavian groups. Laser spectroscopy aspects to be pursued through consolidated grants Others welcome to join – bring ancillary detectors etc.
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Letter from D-G
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FINIS
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