Post on 17-Jan-2016
description
Mats Lindroos
Future R&D: beta-beam
Mats Lindroos
Mats Lindroos
Production
• Test of target prototypes at e.g. TRIUMF (ISAC facility).
• Prototyping of a ring with ionization cooling for production of beta-beam isotopes.
Mats Lindroos
Production ring with ionization cooling
Mats Lindroos
6He production from 9Be(n,)
• Converter technology preferred to direct irradiation (heat transfer and efficient cooling allows higher power compared to insulating BeO).
• 6He production rate is ~2x1013 ions/s (dc) for ~200 kW on target.
Converter technology: (J. Nolen, NPA 701 (2002) 312c)
Mats Lindroos
ISAC at TRIUMF: First high power ISOL facility!
Mats Lindroos
Ionization and Bunching
• Test of all concepts for efficient ionization and bunching.
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60 GHz « ECR Duoplasmatron » for gaseous RIB
Very high densitymagnetized plasma
ne ~ 1014 cm-3
2.0 – 3.0 T pulsed coils or SC coils
60-90 GHz / 10-100 KW10 –200 µs / = 6-3 mm
optical axial coupling
optical radial (or axial) coupling(if gas only)
1-3 mm100 KV
extractionUHF windowor « glass » chamber (?)
Target
Rapid pulsed valve ?
20 – 100 µs20 – 200 mA
1012 per bunchwith high efficiency
Small plasmachamber ~ 20 mm / L ~ 5 cm
Arbitrary distanceif gas
P.Sortais et al.
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cryogenictraptarget
largeplasma chamber
efficient pumping(minimize charge exchange)
+ 20 kV
multi electrodesystem
28 GHz+
37 GHz(15 kW)
5 T 2.5 T
Source scheme
D. Hitz, CEA
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injectionside extraction
side2 to 4 central coils
hexapolar radial field
or dodecapolar radial fieldfor a better emittance
several central coils for a good confinement nearby injection side and worse confinement at extraction side
Magnets
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Accumulation
• Design of accumulation ring
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Accumulation at 400 MeV/u
2 4 6 8 10
Accumulationtime
21018
41018
61018
81018
11019
1.2 1019
Annualrate 6HeT1/2=1.67 s
T1/2=17 s
T1/2=0.67 s
Mats Lindroos
The annual rate
• The annual rate at the EURISOL beta-beam facility is a factor of two below the annual rate assumed in most calculation– Is it possible to re-gain this missing
factor of two within the present base-line?
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High gamma beta-beam
Gamma Rigidity[Tm]
Ring length T=5 Tf=0.36
Dipole Fieldrho=300 mLength=6885m
100 938 4916 3.1
150 1404 6421 4.7
200 1867 7917 6.2
350 3277 12474 10.9
500 4678 17000 15.6Civil engineering
Magnet R&D
New SPS
Mats Lindroos
Summary
Project Subjects Cost Other communities
Production •Production ring•Target tests
5-15 MEuro10-30 FTE
Nuclear Astrophysics, Hadron therpay
Ionization and bunching
•60 GHz ECR (2 types)•BNL EBIS?
5-10 MEuro5-10 FTE
Nuclear physics
Machine studies •HI acceleration•Accumulation•Higher gamma beta-beam
Manpower Heavy ion physics, Nuclear physics
Mats Lindroos
Conclusions
• For the proposal:– Decide on a strategy for EU proposals for
neutrino beams– Appoint a writing group(s) and set up a
schedule for the proposal(s)– Present the proposal(s) for ESGARD
• For the beta-beam:– We need to enlarge the community– For a fair comparison with neutrino factories
we need to study the limits of the concept starting at “study 1”.