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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