isol-srs project 1. 2 storage ring at isolde beam quality luminosity
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ISOL-SRS project
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Storage ring at ISOLDE
Beam quality
Luminosity
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International Collaboration
• 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.
Eur. Phys. J. Special Topics207, 1-117 (2012)
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
1 m uniform field
External spectrometer (Liverpool-Daresbury)for high resolution studies of nuclear reactions on heavier nuclei outside the ring
4 x 125 x 25 mm; 0.5 -1 mm strips; R3B-type readout
detector
1m uniform B field
e.g. Q-value = 1.01 Elab (MeV) - 9.92 - 0.21 z (cm)
for 10 MeV/u 132Sn(d,p)
HELIOS concept
detector R
detector DE
target extentbeam DE beam spot diverge
INTERNAL SPECTROMETER: d(26Al,p)27Al @ 10 MeV/u
EXTERNAL SPECTROMETER: d(24Ne,p)25Ne @ 10 MeV/u
With HIE-ISOLDE beam: 38 keV With cooled TSR beam: 22 keV
Cooled TSR beam: 29 keV
Q-value resolution
detector X,Z
detector DE
DE beam target
DE ejectile target
beam scatter
ejectile scatter
beam straggleejectile stragglebeam DEbeam spot
beam diverge
B field
detector X,Z
detector DE
DE beam target
DE ejectile targetbeam scatter
ejectile scatter
beam straggle
ejectile straggle
beam DE
beam spotbeam diverge
B field
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• Internal: Recirculation advantage for light species; any pure light gas, e.g. helium-3, can be used as target.
Acceptance and luminosity
• 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.
• 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:
MRI magnet: Oxford OR66
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Layout
OR66 magnet fringe field
Space allocation for magnet assumed to be 10 x 10m
Gantt chart
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Install at CERN first quarter of 2019
LS2 2019-2020 (if delayed by 1 year)
Exploitation with direct HIE beams 2020-2023
Exploitation with TSR beams from 2023
Planning
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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.
Re-phrase of D. Jenkin’s ISCC slide
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Letter from D-G
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FINIS