rib production with spiral 2

Rencontre de Moriond, 17-22 March

Spiral2Spiral2RIB production with SPIRAL 2

1. Versatile and evolutive

2. Fission fragments with D beam Goal > 1013 fissions/sfusion-evaporation with heavy ions

3. Basic configuration :

Fission fragments produced by n-induced fission Converter d-n with a carbon wheel UCx fissile target - low or high density (Gatchina) Possibility to couple different ions sources (1+) 1+/n+ (charge breeder) approach

UCxD

C

IS ECR1+ n+


Spiral2Spiral2

UCxd,3,4He,...

UCxd n

0.15mA 5.1012 f/s 6kWFission of 240Pu,... Ex≥ 50 MeV

4.5 mA 1013 f/s =2.3g/cm2 V=240cm3

5 mA 5.1013 f/s =11g/cm2 V=240cm3

5 mA 2.1014 f/s =11g/cm2 V=1000cm3 6kW (limit)Fission of 239U Ex= 20 MeV

with converter ...

without converter ...

40 MeV deuteron, 5 mA 200 kW dissipation in the converter

acces to a wider mass region

Fission yields


Spiral2Spiral2

on target

x 10-2 - 10-3

towards experiment

d (40 MeV, 4.3 mA) + C + UC (2.3 g/cm3, 363 g)

Fission yields (low density and with converter)


Spiral2Spiral2

104

105

106

107

108

109

1010

1011

1012

127 128 129 130 131 132 133 134 135

Yie

ld (p

ps)

A

Produced in the ISOL target

After acceleration

Sn

T1/2 (s) Diff. Eff.-t Eff.-tube 1+ 1+/n+ Acc. Total132 40 0.31 0.83 0.99 0.3 0.04 0.5 1.5e-3133 1.4 0.065 0.16 0.86 0.3 0.04 0.5 5.4e-5

Efficiencies for Sn isotopes M.G. Saint-Laurent

Sn isotopes

D 4 mA on C with UCx lowdensity target (1013 fissions/s).

UCx target

IS

Example : production from D beam


Spiral2Spiral2

Thicktarget

p,d,…,HI

Fusion-evaporation and transfer reactionsresidues producedby thick target method (like ISOL@GSI)

example 58Ni + 50Cr 100Sn 1+ ~1 pps

HI

Thintarget

separator

Spectroscopy of N=Z A≈100

Fusion-evaporation residues produced by thin target method (In-Flight)example 28Ni + 58Mg 80Zr 1+ ~ 3 x 104 pps

Primary Heavy Ion beams at 14.5 A.MeV of 1 mA, up to Ar

Production from Heavy Ion Beams

neutron deficient RIB

neutron rich RIB


Spiral2Spiral2

4. Fusion reaction with exotic beam

1. Fission products

3. N=Z

5. Transfermiums In-flight (Z=106, 108)

2. High Ex fission products

Regions of the nuclear chart covered by ...


Spiral2Spiral2

Plug housing C converterand UCx target

dose rate 32 Sv/h at 1 m and 34 mSv/h after 1 year

rotating C wheel

2 m concrete dose rate< 7.5 Sv/hprimary beam

(deuterons)

exotic beam

Target & Ion Source : the Plug solution


Spiral2Spiral2Detail of the rotating wheel

UC2 target

Carbon « standard »

Ti support

R = 385 mm

Beamsize: 10 x 25 mm

First study


Spiral2Spiral2

• Must be an evolutive and versatile machine• Optimised for q/A=1/3 ions and must accelerate D+ (q/A=1/2)• No stripper, to make a direct profit of the ECR sources evolutions

for heavy ions, as far as beam energy is concerned• 1 mA for ions (up to Argon) and 5 mA for deuterons• Injector: RFQ with a 100% Duty Cycle

Exit Energy: 0.75 A.MeV - 1.5 A.MeV (according to the frequency)• LINAC: Independant Phase Superconducting Cavities

based on QWRs and/or HWRs up to 40 MeV or 14.5 A.MeVFrequency : 88 MHz and 176 MHz or 176 MHz for the whole linacgradient ~ 6-8 MV/m ( = Vacc / ) ~ 30-40 resonators

DRIVER

14.5 A.MeV ions40 MeV deuteronsSource Injector Linear accelerator


Spiral2Spiral2

example of ACCEL cryostat

(4 cavities, 2 solenoids)

SC Solenoid + steering coils+ active screening

Deuteron Source ex. SILHI-type

(permanent magnets)

QWR Argonne

RFQ (Cu plated SS version)

Main driver components


Spiral2Spiral2 deuterons (5 mA) : “downgrade” of SILHI source or micro-phoenix or ... heavy ions q/A=1/3 (1 mA)

cw mode, voltage = 60 kV, < 200 mm mradstate-of-the-art : 18O6+ 1 mA 36Ar12+ 0.2 mA High Frequency & high B

1. A fully superconducting ECRIS (close to the GYROSERSE project)Bmax = 4 T; Brad = 3 T; large ECR zone, F = 28 GHz, and possibly above

2. A compact source, with lower magnetic field & higher power density (A-PHOENIX)technology based on HTS coils and permanent magnets Bmax = 3 T; Brad= 1.6 T

SERSE at LNS (14-18 GHz)

PHOENIX (28 GHz)

Primary Sources R&D


Spiral2Spiral2Low Energy Beam Transfer (LEBT)

Goal : to transport and to match and 2 types of beam

to RFQ with very low loss

energy : 20 keV/n

D+ (5 mA, 40kV) q/A=1/3 (1mA, 60kV)


Spiral2Spiral2Beam Dynamics studies determine the optimal choice of linac frequency resonator types transition energies (RFQ output, geometric betas) Nb of resonators / cryostat, etc ...and should also accelerate heavier ions (q/A~1/6)2 options : 88/176 MHz or 176 MHz for the whole linac

pro’s and con’s88 MHz requires QWRs easier fabrication and cleaning but dipole fields only partially compensated176 MHz only only HWRs could be used but more dissipation in the RFQ, requires higher RFQ output energy

Linac architecture


Spiral2Spiral2

classical brazed Cu88 or 176 MHz

separated functions88 MHz

with rf joints88 or 176 MHz

Cu plated SS88 MHz

Different technological solutions for the RFQ4-rod RFQ, IH-type RFQ cheaper but low-frequency

4-vane RFQ cw operation & high transmission

IAP Frankfurt


Spiral2Spiral2

1/21/3

Phase space at the RFQ output

Ex. 88 MHz 4-vane Length = 5m Energy = 0.75 A.MeVaperture = 8 - 10 mm vane voltage = 100 -113 kV Modulation 1-2

Transmission 99,95% (1/2) 99,93% (1/3)


Spiral2Spiral2

Legnaro-type QWR Argonne_type QWR and HWR(with field asymmetry compensation)

~ 40 resonators at 6 MV/m ~ 30 resonators at 8 MV/m

Resonators


Spiral2Spiral2

phase advance too large !

Beam dynamics in the SC linac

2 essential rules to avoid dilution + beam loss :1. phase advance < 90°

2. long. & trans. matching between tanks

favours large Nb cavities / tank

solenoid instead of quad focusing1 solenoid / cavity at low energy to keep

the beam size < the cavity aperture (30 mm max)

Bz < 7-8 T to keep

classical technology

NbTi SC solenoid


Spiral2Spiral2

CIME

SC LINAC

Deuteron 40 MeVHeavy ions 15 MeV/u

RFQ

charge breeder1+ / N+

Low energy RIBFissio

n fragments

<6 MeV/nuclé

on

Separator

Target-Sourcesystem

DeuteronSource

Q/A= 1/3ion source

Schematic lay-out (1)


Spiral2Spiral2

ECR Sources(d and q/A=1/3 ions)

RFQSC LINAC40 MeV and 14.5 A MeV

F. Daudin

Injection to CIME

Low energy RIB

stable heavy ions

post-accelerator CIME

Schematic lay-out (2)


Spiral2Spiral2GANIL expansion


Spiral2Spiral2

…………… 2001 2002 2003 2004 2005 2006 2007 2008

APS

APD

Construction

CONSTRUCTIONDECISION

FIRSTBEAMS

OptionChoice

FirstStudies APD ~ 2 years

Nov 2004

Time schedule


Spiral2Spiral2D

river

ligh

t (he

avy)

ions

Long-term future (1)

can be used as a post-acceleratorwith future upgrade in energy

SPIRAL 2Energy upgrade


Spiral2Spiral2

production

postaccelerator

Long-term future (2)

or can be used as the low energy partof a future high energy driver

SPIRAL 2

Energy upgrade

rib production with spiral 2

Documents