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CERN-ISCC Meeting
“Storage Ring Facility atHIE-ISOLDE”
Klaus Blaum
3rd Nov 2011
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Important steps:
1) TSR@ISOLDE Workshop at the Max-Planck-Institute for Nuclear Physics 28.-29.10.2010 (34 participants)
2) Presentation of the TSR@ISOLDE LOI at the CERN INTC- Meeting 02.02.2011 (about 60 coauthors)
3) Presentation of the scientific (Yuri Litvinov) and technical Fredrik Wenander) part of the TSR@ISOLDE Project at the STORI 2011 conference
4) TSR@ISOLDE Meeting at MPIK in order to discuss the open questions related to the preparation of the TDR for the INTC meeting (28.10.2011)
5) TDR for the TSR@ISOLDE project almost ready for submission, which is planned for the February 2012 INTC Meeting (> 120 coauthors, about 20 institutions)
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Presently 125 pages!
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The heavy ion storage ring TSRat MPIK Heidelberg
Cir
cum
fere
nce
: 55
m
TSR Max Planck Institute Heidelberg
TSR@HIE-ISOLDELOI Jan 2011 TDR in progress(K. Blaum, Y. Litvinov)
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Some technical details:
• Typical storage energy for 12C6+: E = 72 MeV 6 MeV/u• Vacuum: ~10-11 mbar• Acceptance ellipse of the TSR: 120 mm mrad well suited for REX-ISOLDE• Multiturn injection mA of stored beam possible• Electron cooler transverse cooling time of ~1s• RF acceleration and deceleration possible• Typical storage times:
p @ 21 MeV: 60 h9Be1+ @ 7 MeV: 16 s12C6+ @ 73 MeV: 7470 s35Cl17+ @ 202 MeV: 318 s 197Au51+ @ 710 MeV: 23 s
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1. Half-life measurements of 7Be in different
atomic charge states
2. Capture reactions for astrophysical p-process
3. Nuclear astrophysics through transfer reactions
4. Nuclear structure through transfer reactions
5. Long-lived isomeric states
6. Atomic effects on nuclear half-lives
7. Di-electronic recombination on exotic nuclei
8. Atomic physics experiments
9. Neutrino physics
10. (Laser spectroscopy experiments in the storage ring)
Physics cases discussed in
the TSR@ISOLDE TDR
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Two possible locations at ISOLDE for the ring
10m restriction
F/CH borderF
CH
Courtesy of Erwin Siesling
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8
Jura (west) side
24.6m23.3m
Building costs: ~ 3MCHF
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9
Jura (west) side
Proposed layout to fit the TSR at the west side:- Installation above the CERN infrastructure-tunnel (not negotiable to move the tunnel: houses essential CERN signals and infrastructure) - Tilted beamline coming up from the machine
24.6m23.3m
3m
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10
Surface & Weight
12m
Total surface available basement: 12mx24.6m=295m2to house power-supplies and additional racks (total 29m length floor space for the TSR equipment and 7m for the e-target equipment + 10 standard 19’’ racks and ECOOL HV cage 4x4m2)
Total surface TSR floor: 24.6x23.3m=573m2 of which 20x20m (400m2) reserved for the ring (final position of the ring within the building to be defined)TSR floor approx . 3m above Hie Linac floor
Level of the center of beam at 1.77m above TSR floor
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Further information:
Detailed estimation of the costs and manpowerrequirements are in preparation. preliminary values by MPIK exist; information from CERN needed
Funding requests to the different agencies are under discussion (e.g. UK)
Ideal time schedule: Building ready end of 2013,move of the ring in 2014, commissioning and start in 2015.
Financial support by the ISOLDE Collaboration is needed in order to realize this project.
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Some speculations on the EC-decay of 7Be
A.V. Gruzinov, J.N. Bahcall, ApJ 490 (1997) 437
Ionization of 7Be in the Sun can be ~ 20-30 %
S. Kappertz et al., AIP Conf. Proc. Vol. 455 (1998) 110
Negative magnetic moment of 7Be
TSR@ISOLDE would be the best place to perform these experiments!
Y. Litvinov, MPIK and GSI
7Be + e- 7Li + e7Be + p 8B +
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René Reifarth (U. Frankfurt/GSI)
Reaction Studies for Astrophysical Applications
Measurements of (p,) or (α,) rates in the Gamow window of the p-process in inverse kinematics.
Advantages:
• Applicable to radioactive nuclei• Detection of ions via in-ring particle
detectors (low background, high efficiency)
• Knowledge of line intensities of product nucleus not necessary
• Applicable to gases
ESR
Gas jet
Particle detectors
Similar experiments possible at TSR@ISOLDE!
Proof-of-principle experiment:
96Ru (p,)97Rh
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René Reifarth (U. Frankfurt/GSI)
Preliminary result @ 11 MeV – upper limit
σPG ~ 4.0 mb
Ignore (p,n) component – resulting in an upper limit
for (p,)
Non-smoker: 3.5 mb
HIE-ISOLDE energy range fits perfectly!
Similar experiments with radioactive beams feasable at HIE-ISOLDE + TSR.
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Transfer Reaction Studies: Physics casesTransfer around the island of inversion
32Mg(d,p) T1/2 = 86 ms, 3103 pps not possible (half lives)
Transfer towards 78Ni68Ni(d,p) T1/2 = 29 s, 5104 ppsLimit given by atomic charge exchange
R. Raabe, K.U. Leuven
Transfer around 100Sn102Sn(p,d) T1/2 = 4.5 s, 102 – 103 pps ??
Could be feasible! But probably notat 10 MeV/u
Transfer around 132Sn134Sn(d,p) T1/2 = 1 s, 104 pps ?
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5E3 5E4 2E51E2 1E6
3E3 1E4 7E4
2E6
1E2
1E3
Shape coexistence in n-poor Pb regionStill unique @ ISOLDE(Bi, Tl never post-accelerated so far)
Beam losses??
1E6
1E5
1E4
1E3
1E2 2E51E5
Transfer Reaction Studies: Physics cases
R. Raabe, K.U. Leuven
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Nuclear Excitation by Electron Capture
[A. Palffy et al., Phys. Rev. Lett. 99 (2007) 172502]
an as-yet unobserved process
difficulty: NEECcompetes with muchstronger, but non-resonant process ofradiative capture:X-ray emitted,instead of nuclearexcitation.
electrons nucleons electrons nucleons
- nuclear analogue of dielectronic recombination- inverse of electron conversion
P. Walker, SurreyProposed candidate 93Mo
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Neutrino physics studies
• Ideal test facility for the accumulation and storage of 6He