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The DESIR facility at SPIRAL2. D ésintégration, E xcitation et S tockage d’ I ons R adioactifs Decay, excitation and storage of radioactive ions. collaboration initiated during the first SPIRAL2 workshop, July 2005 to use SPIRAL2 and SPIRAL low energy (<60 keV) beams for

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slide1

The DESIR facility at SPIRAL2

Désintégration, Excitation et Stockage d’Ions Radioactifs

Decay, excitation and storage of radioactive ions

  • collaboration initiated during the first SPIRAL2 workshop, July 2005
  • to use SPIRAL2 and SPIRAL low energy (<60 keV) beams for

decay spectroscopy

laser spectroscopy

ion and atom trap experiments

  • Spokes-person: Bertram Blank
  • GANIL liaison: Jean-Charles Thomas

Gerda Neyens, SAC SPIRAL2, 26 november 2007

slide2

The DESIR experimental set-ups

(present status)

  • * MLL trap system (LMU Munich)
  • * b-charged particle set-up (Bordeaux, GANIL, Strasbourg, Orsay, Madrid)
  • * Collinear laser set-up (Manchester, Leuven, Birmingham, Orsay)
  •  talk P. Campbell, Thursday, 17.00u
  • * b-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)

 All these collaborations are obviously open to other interested users!

slide3

GANIL Today

Existing GANIL facility

LIRAT

Low energy

beams from SPIRAL

EXPERIMENTAL AREAS

GANIIL cyclotrons

CIME (SPIRAL cyclotron)

Ligne d\'IonsRAdioactifs àTrès basse énergie....

slide4

candidate:

(pure GT transition)

LPC Paul trap @ LIRAT

Production and preparation of 6He for weak-interaction studies

deduce bn angular correlation from measurement of b-recoil

(recoil with very low energies < 1 keV)

6He+ production at SPIRAL

cooling in H2 gas / bunching

trapping/measuring

LIRAT low energy beam line

Oscar Naviliat-Cuncic et al., LPC Caen

slide5

SPIRAL 2 LAYOUT

Existing GANIL facility

LIRAT

+LIRAT2

Production building

For RIB

DESIR

Low energy beams from

SPIRAL and SPIRAL2

(and S3 ?)

S3

High-intensity stable beams on thin target

+ in-flight high-resolution separator

+ gas cell for stopping

+ ??

LINAG

(high intensity d and stable beams)

slide6

Schematic SPIRAL 2 LAYOUT

EXISTING EXPERIMENTAL AREAS

EXISTING ACCELARATORS

CSS1

CSS2

CIME

PRODUCTION BUILDING

LINAG

Recent idea:

send S3 radio-isotopes (re-ionized from gas cell)

to DESIR set-ups for mass, radii, moments, decay studies ….

DESIR

S3

slide7

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)

slide8

SHIRaC = SPIRAL2 High Intensity Radiofrequency Cooler

Prototype RFQ linear Paul trap, set up initially at CSNSM Orsay

Now transferred to LPC Caen for further development

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

Goals: * high-voltage (20 kV), high frequency (20 MHz) linear radio-frequency

quadrupole trap for strong confinement of mA 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 mA beam has been trapped

(O. Gianfrancesco et al., Proc. EMIS2007)

slide9

High Resolusion Mass Separator

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

  • symmetric design, inspired by the CARIBU HRS at Argonne National Laboratory:

with two magnetic dipoles D combined as QQHQD M DQHQQ

six quadrupoles Q

two sextupoles H

one multipole M

 To minimize aberrations, provide large mass dispersion

Suggested layout

Beam profile in x-direction

Status: in design phase

Integrated in production building

slide10

Linac

beam

Production building

RFQ

cooler

IBE 1+

DESIR 1+

Ion source 1

User request:

By-pass RFQ/HRS

Ion source 2

CIME n+

IBE n+

HRS

Booster

F. Varenne, GANIL

slide11

1+ beam

DESIR

~ 1500 m2

b-NMR

general

purpose

spectroscopy

Paul

trap

Collinear

Laser

Line

MOT

trap

neutrons

x

Off-line

Ion sources

D. Lunney, CSNSM

slide12

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€ -
slide13

Equipment to come to DESIR

MLL trap system: LMU München 860 kEuros

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

Collinear laser spectroscopy:

Manchester 300 kEuros

Orsay 200 kEuros

Leuven 150 kEuros

b-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

slide14

The DESIR facilityin FP7 preparatory phase

Study of exotic nuclei at ISOL energies using decay, excitation and storage of nuclei

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 DESIR

contribute to the development of the trapping system of DESIR.

Deliverables:

Reports on

- MLL trap test

- beam line design

- HRS design

MoU signed

Requested Budget

manpower: 142k€ (Beneficiary CNRS, KVI) 2 post-docs for beam line and HRS

material: 16k€ (Beneficiary: GANIL, CNRS)

travel funding for collaboration meetings ~ 40k€

slide15

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

Tuesday 9.00-11.00

Welcome – 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 setup 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 !

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