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.

Mats Lindroos

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.

Mats Lindroos

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

Mats Lindroos

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

Mats Lindroos

Accumulation

• Design of accumulation ring

Mats Lindroos

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?

Mats Lindroos

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”.