Transcript Document

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
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!
GANIL Today
EXPERIMENTAL AREAS
Existing GANIL facility
CIME (SPIRAL cyclotron)
LIRAT
Low energy
beams from SPIRAL
Ligne d'
Ions
RAdioactifs à
Très basse énergie....
LPC Paul trap @ LIRAT
Production and preparation of 6He for weak-interaction studies
candidate:
(pure GT transition)
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
SPIRAL 2 LAYOUT
Existing GANIL facility
LIRAT
Production building
+LIRAT2
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
Schematic SPIRAL 2 LAYOUT
EXISTING EXPERIMENTAL AREAS
EXISTING
ACCELARATORS
CSS1
CSS2
DESIR
CIME
PRODUCTION
BUILDING
LINAG
S3
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 = 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)
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
Production building
Linac
beam
HRS
Ion source 1
RFQ
cooler
DESIR 1+
User request:
By-pass RFQ/HRS
IBE 1+
Booster
Ion source 2
F. Varenne, GANIL
IBE n+
DESIR
~ 1500 m2
b-NMR
Paul
Collinear
trap
Laser
MOT
Line
general
purpose
spectroscopy
trap
neutrons
x Off-line
Ion sources
D. Lunney, CSNSM
DESIR: Financial situation
Main parts:
estimated costs
• RFQ and HRS « building »:
included in SPIRAL2 project
• DESIR building:
fund available
6000 k€
2000 k€ (CPER)
• RFQ:
320 k€
320 k€ (CPER)
• HRS:
500 k€
-
3600 k€
-
60 k€
-
• beam lines:
• off-line source
Equipment to come to DESIR
MLL trap system:
LMU München
860 kEuros
b-charged particle setup:
France, ANR VS3 2006
240 kEuros
Manchester
Orsay
Leuven
300 kEuros
200 kEuros
150 kEuros
b-NMR setup:
Leuven
100 kEuros
Spectroscopy setup:
Madrid
200 kEuros
MOT trap:
KVI Groningen
500 kEuros
TAS setup:
Valencia
180 kEuros
Collinear laser spectroscopy:
Neutron detection (multiplicity, TETRA setup): Dubna
Neutron detection (energy):
200 kEuros
(LPC Caen and others) 400 kEuros
The DESIR facility in 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.
1st year
T1
DESIR Collaboration
Committee meetings
DESIR Collaboration
meeting
Tests of the MLL trap
Design of the DESIR beam
lines
T2
T3
2nd year
T4
T1
T2
T3
T4
Deliverables:
Reports on
- MLL trap test
- beam line design
- HRS design
MoU signed
Design of the HRS
Memorandum of
understanding
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€
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 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 !