The The DESIRDESIR facility at SPIRAL2 facility at SPIRAL2

collaboration initiated during the first SPIRAL2 workshop, July 2005

to use SPIRAL2 and SPIRAL low energy (<60 keV) beams fordecay spectroscopy

laser spectroscopy

ion and atom trap experiments

Spokes-person: Bertram Blank

GANIL liaison: Jean-Charles Thomas

Gerda Neyens, SAC SPIRAL2, 26 november 2007

Désintégration, Excitation et Stockage d’Ions RadioactifsDecay, excitation and storage of radioactive ions

* MLL trap system (LMU Munich)* -charged particle set-up (Bordeaux, GANIL, Strasbourg, Orsay, Madrid)* Collinear laser set-up (Manchester, Leuven, Birmingham, Orsay) talk P. Campbell, Thursday, 17.00u* -NMR set-up (Leuven)* MOT trap (KVI Groningen, LPC Caen)* TAS set-up (Valencia)* TETRA neutron set-up (Dubna) talk Y. Penionzhkevich Thursday 17.00u* Neutron energy set-up (LPC Caen)* LPC-trap (LPC Caen)

The The DESIRDESIR experimental set-ups experimental set-ups(present status)

All these collaborations are obviously open to other interested users!

GANIL TodayGANIL TodayExisting GANIL facility

LIRAT Low energy beams from SPIRAL

EXPERIMENTAL AREAS

CIME (SPIRAL cyclotron)

GANIIL

cyc

lotro

ns

Ligne d'IonsRAdioactifs àTrès basse énergie....

6He+ production at SPIRAL

LIRAT low energy beam line

cooling in H2 gas / bunching

trapping/measuring

candidate: (pure GT transition)

deduce angular correlation from measurement of -recoil(recoil with very low energies < 1 keV)

LPC Paul trap @ LIRATLPC Paul trap @ LIRATProduction and preparation of Production and preparation of 66He for weak-interaction studiesHe for weak-interaction studies

Oscar Naviliat-Cuncic et al., LPC CaenOscar Naviliat-Cuncic et al., LPC Caen

SPIRAL 2 LAYOUTSPIRAL 2 LAYOUT

LINAG (high intensity d and stable beams)

Production building

For RIB

Existing GANIL facility

LIRAT

+LIRAT2

DESIRLow energy beams fromSPIRAL and SPIRAL2(and S3 ?)

S3High-intensity stable beams on thin target+ in-flight high-resolution separator+ gas cell for stopping+ ??

DESIR PRODUCTION BUILDING

LINAG

EXISTING EXPERIMENTAL AREAS

CIME

EXISTING ACCELARATORS

CSS2

CSS1

S3

Schematic SPIRAL 2 LAYOUTSchematic SPIRAL 2 LAYOUT

Recent idea: send S3 radio-isotopes (re-ionized from gas cell) to DESIR set-ups for mass, radii, moments, decay studies ….

Beam requirements for ISOL-type experiments:

high degree of purity needed for exotic beams !

= good mass selectivity and element selectivity.

Suggested solutions for SPIRAL2 produced beams:

+ RFQ high-efficiency cooler/buncher for efficient reduction of beam emittance (G. Ban, LPC, DESIR session and F. Duval, LPC, Tuesday 17.00u)

+ high resolution mass separator (T.Kurtukian-Nieto, CENBG, DESIR session Tuesday 9.00u)

+ laser ionization source (element selection during ionization) (A. Olivier, IPNO and N. Lesecne, GANIL, Thursday 17.00u)

SHIRaC = SHIRaC = SSPIRAL2 PIRAL2 HHigh igh IIntensity ntensity RaRadiofrequency diofrequency CCoolerooler

Prototype RFQ linear Paul trap, set up initially at CSNSM OrsayNow transferred to LPC Caen for further development

Goals: * high-voltage (20 kV), high frequency (20 MHz) linear radio-frequency quadrupole trap for strong confinement of A beams.

(gain factor 100 in confinement compared to present devices)

* incorporate two sections with different radius (to reduce losses at the injection)

Results so far:* Prototype partially tested at high-current separator SIDONIE (Orsay)

a 1.1 A beam has been trapped (O. Gianfrancesco et al., Proc. EMIS2007)

See talk F. Duval, LPC, Tuesday in ‘selected contributions’

High Resolusion Mass SeparatorHigh Resolusion Mass Separator

symmetric design, inspired by the CARIBU HRS at Argonne National Laboratory:with two magnetic dipoles D combined as QQHQD M DQHQQ

six quadrupoles Qtwo sextupoles Hone multipole M

To minimize aberrations, provide large mass dispersion

Beam profile in x-direction

Suggested layout

Status: in design phaseIntegrated in production building

See talk T.Kurtukian-Nieto, CENBG, DESIR session Tuesday 9.00u

RFQcooler

DESIR 1+

Booster

IBE 1+

IBE n+

CIME n+

Production buildingProduction buildingLinacLinacbeambeam

Ion source 1

Ion source 2

F. Varenne, GANILF. Varenne, GANIL

HRS

User request:By-pass RFQ/HRS

1+ beam

DESIRDESIR

x

Paul trap

Off-lineIon sources

D. Lunney, CSNSMD. Lunney, CSNSM

CollinearLaserLine

MOT

-NMR

~ 1500 m2

neutrons

generalpurpose

spectroscopy

trap

DESIR: Financial situation

Main parts: estimated costs fund available

• RFQ and HRS « building »: included in SPIRAL2 project

• DESIR building: 6000 k€ 2000 k€ (CPER)

• RFQ: 320 k€ 320 k€ (CPER)

• HRS: 500 k€ -

• beam lines: 3600 k€ -

• off-line source 60 k€ -

MLL trap system: LMU München 860 kEuros

-charged particle setup: France, ANR VS3 2006 240 kEuros

Collinear laser spectroscopy:Manchester 300 kEurosOrsay 200 kEuros Leuven 150 kEuros

-NMR setup: Leuven 100 kEuros

Spectroscopy setup: Madrid 200 kEuros

MOT trap: KVI Groningen 500 kEuros

TAS setup: Valencia 180 kEuros

Neutron detection (multiplicity, TETRA setup): Dubna 200 kEuros

Neutron detection (energy): (LPC Caen and others) 400 kEuros

Equipment to come to DESIR

The DESIR facilityThe DESIR facility in FP7 preparatory phasein FP7 preparatory phaseStudy of exotic nuclei at ISOL energies using decay, excitation and storage of nuclei

1st year 2nd yearT1 T2 T3 T4 T1 T2 T3 T4

DESIR Collaboration Committee meetingsDESIR Collaboration meetingTests of the MLL trap

Design of the DESIR beam lines

Design of the HRS

Memorandum of understanding

Task : organise meetings of the DESIR Coordination Committee, prepare the proposal for the DESIR facility, study the high-resolution separator and the beam lines of DESIRcontribute to the development of the trapping system of DESIR.

Requested Budgetmanpower: 142k€ (Beneficiary CNRS, KVI) 2 post-docs for beam line and HRSmaterial: 16k€ (Beneficiary: GANIL, CNRS)travel funding for collaboration meetings ~ 40k€

Deliverables:Reports on - MLL trap test- beam line design- HRS designMoU signed

DESIR Meeting Conv. : B. Blank (Atelier Alcandre, Congress Center)

Tuesday 9.00-11.00Welcome – B. Blank (CENBG)The DESIR building - J.C Thomas (GANIL)DESIR RFQ cooler SHIRAC – G. Ban / F. Duval (LPC)DESIR high-resolution separator – T. Kurtukian – Nieto (CENBG)Setups forseen for DESIR – B. Blank (CENBG)Financial aspects – B. Blank (CENBG)MLL trap at DESIR – P. Thirolf (LMU Muenchen)The LIRAT2 project – J.C Thomas (GANIL)Laser spectroscopy set up for LIRAT2 / DESIR – G. Neyens (K.U Leuven)Laser resonant ionisation to purify radioactive beams – K. Flanagan (CERN)Organisation of the DESIR collaboration – B. Blank (CENBG)DESIR Proposal – B. Blank (CENBG)DESIR web page – B. Blank (CENBG)

EVERYBODY WELCOME !