georgi georgiev, csnsm, orsay, france · 2018. 11. 16. · georgi georgiev, csnsm, orsay, france ....
TRANSCRIPT
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The ALTO facility
Georgi Georgiev,
CSNSM, Orsay, France
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Stable beams 3928 h /y
25% light ion beams 984 h
75% heavy ion beams 1964 h
RIB 360 h /y
The ALTO facility
360 staff members
250 outside users (30 countries) /y
15 MV 50 MeV
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Stable and radioactive installations within a unique facility
Program Advisory Committee • R.F. Casten (Chairman) • E. Balanzat – Caen • D. Balabanski – Bucharest • S. Grévy - Bordeaux • E. Khan – Orsay • A. Maj - Krakow • P. Regan – Surrey • P. Reiter – Cologne • B. Rubio – Valencia • J.-C. Thomas – GANIL • A. Tumino – Catania • C. Trautmann - GSI
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Split-pole
Bacchus
ORGAM &
MINORCA
Licorne
Isol
mass separator and
low-energy RIB lines
cluster,
molecular &
droplets beams
Stable beam with spectrometer
Stable beam w/o spectrometer
Radioactive beam lines
Isol
production cave
e LINAC
Experimental areas
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ca 1964 : mass spectrometry activities in Orsay
beginning of the 70’s : the ISOCELE ISOL setup at the Orsay SC (now proton therapy center)
end 70’s/beginning 80’s, upgrade of the SC ISOCELE2
end 80’s, first online laser ion source at IPN: PILIS
beginning 90’s PILIS activity moves to ISOLDE/CERN → COMPLIS setup
End 90’s, beginning 2000’s ISOL activity back at IPN: PARRNe
mid - 90’s SPIRAL project SPIRAL2 : increase the mass range introduction of the ISOL technique at GANIL d vs e- driver option
A bit of history
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exploratory photo-fission experiment at CERN
arrival of the LINAC cavity from
decommissioned LEP injector
construction of the LINAC bunker
RF system
First e-beam extracted
UCx target on line with e-beam
– production yields measurements
Commissioning : tests and radiation safety measurements
TIS vault
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
1999
1998
building of the low energy beam
lines + laser ion source
2011
2012
2013
green light from French nuclear
safety authorities
BEDO commissioning
first laser ionized RIB
83Ga -> 83Ge b-decay
81Zn -> 81Ga b-decay
84Ga -> 84Ge b-decay
initial idea of a R&D test bench for the SPIRAL2 project at the Orsay Tandem
INAUGURATION
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figures from
Y. Oganessian et al., NPA 701 (2002) 87c
20 µA 25 MeV e- + 40 g/cm2 238U
1.5 1011 f/s
238U(γ,f) cross section from
J.T.Caldwell et al., PRC 21 (1980) 1215
Photofission
First proposed RIB facility based on photo-fission: William T. Diamond, Chalk River, 1998
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LEP injector: 50 MeV e-
Photofission at CERN-LPI
F Ibrahim et al, EPJA 15 (2002)
e-
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electron linac
10 µA, 50 MeV
Parrne mass separator
target & ion source
1011 photofissions /s
Photofission at Alto
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F Ibrahim et al, International Topical Meeting on Nuclear Research
Applications and Utilisation of Accelerators, Vienna (2009)
Photofission at Alto
measured mass-separated yields for 100 nA 50 MeV e-
similar to 1 µA 26 MeV d
therefore projected gain of 100x at 10 µA of e-
Production pps /10 µA e-
Stable
104 – 105 105 – 5 105
5 105 – 106 106 – 5 106 5 106 – 107 107 – 5 107
5 107 – 108 108 – 5 108 5 108 – 5 109
extrapolation from the systematic yield measurements made in June 2006 at 100 nA primary intensity
(excursions up to 10µA was possible during the commissioning phase)
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Fluka fission rate in 3.2 g/cm3 UCx target
M Cheikh et al, NIM B 266 (2008)
f/cm3/s
further target optimisation is possible:
standard Isolde target
with external oven for mass marker
∅ = 14 mm L = 140 mm
ρ = 3.2 g/cm3
T ≤ 2000 °C
Target and ion source
e- energy
deposit in
first 2.65 cm
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Physics: B(E2) through fast timing
test case 137,139Cs B Roussière et al, EPJA 47 (2011)
Collaboration IPN, CSNSM, INRNE-Sofia,
Tandar-Buenos Aires
Accelerate release of Ln and other
chemically reactive elements through
fluorinated molecular beams
Higher yields by increasing
UCx density up to 13 g/cm3
Control porosity
Reduce pellet thickness
B Hy et al, NIM B 288 (2012) 34
Ensar ActiLab: IPN, Cern, Ganil, INFN
Target and ion source developments
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Rialto: Resonant laser ionisation at Alto
S. Franchoo et al.
Mezzanine of the mass separator/RIB zone
Nd:Yag pump laser (532 nm, 90 W)
2 dye lasers (540-850 nm, 8W @ 30W pump,
10 ns pulse width, 3 GHz line width)
BBO doubling units (270-425 nm, >100 mW)
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2011, 2012: Gallium with two
ionisation schemes
2013: Zinc with frequency tripling
2014: Off-line chamber for
development of laser schemes
First step
Second step
Collaboration IPN Orsay, Isolde,
Univ. Manchester, Univ. Mainz
Rialto: Resonant laser ionisation at Alto
electron multiplier
laser
ohmic heating
Zn: 4s4p 1P1 → 4s4d 1D
2
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Zn81
Present limit of structure knowledge (at least few excited states are known)
hot plasma ionization (1 µA deuteron primary beam) O. Perru PhD – def. 10th December 2004 Eur. Phys. J. A 28, 307 (2006) surface ionization (2-4 µA electron primary beam) M. Lebois PhD – def. 23th September 2008 PRC 80, 044308 (2009) B. Tastet PhD – def. 13th May 2011 PRC 87, 054307 (2013) D. Testov PhD – def. 17th January 2014 laser ionization (10 µA electron primary beam) K. Kolos PhD – def. September 2012 PRC 88, 047301 (2013)
Ga84 Ga83 Ga82 Ga85 Ga80 Ga79
Ge80 Ge79 Ge81 Ge85 Ge86
As82
hot plasma ionization (1 µA deuteron primary beam) PRC 76 (2007) 054312 laser ionization
more than 10 years of experiments in the 78Ni region at the PARRNe mass separator (Tandem/ALTO) D. Verney et al.
Zn82
b-decay spectroscopy in the N=50 region
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Bedo setup
in gamma mode
4 small Exogam
clovers
Bedo setup
in neutron mode
JINR neutron
detector Tetra
80 3He tubes ε(252Cf) = 53%
borated polyethylene shielding
LaBr3
LaBr3
fast timing
up to 5 Ge detectors ε = 5-6%
4π β trigger
BGO anti-Compton
BEDO: Beta decay at Orsay
D. Verney et al.
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laser-ionised 83Ga beam
4π neutron detector
4π β & 1 Ge detector
D Testov et al., submitted to NIM
Tetra: Beta-delayed neutron emission
βγ
βnγ
83Ga T1/2=0.312s
83Ge
βn P
n = 85(4)%
this work N=50
82Ge
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Approved experiments to be scheduled
N=50 β-γ experiments ● Etile – Verney et al. ● Astier et al
mid-shell Ln’s β-γ fast-timing ● Roussière et al.
n-rich Ge β-γ and β-n experiments ● Duchêne et al.
132Sn region β-γ and β-n experiments ● Penionzhkevich et al. ● Didierjean et al. ● Lozeva et al. ● Gottardo et al. ● R. Li/M. Ramdhane et al.
n-rich Se β-γ and β-n experiments ● Kurtukian Nieto et al.
TAS measurements program ● A.Algora/M. Fallot/A. Porta/B.Rubio/J.L.Tain et al.
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BEDO/TETRA (existing)
LINO (project)
TAS (project)
TETRA (existing)
Identification station
Parrne mass separator
POLAREX (project)
Low-energy radioactive ion beams at Alto
MLL Trap (project)
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132Sn 100Sn
rp process r process
• more accurate theoretical lifetimes of
the N=82 isotones below 129Ag
• shell quenching vs deformation
• shell effect in radii
b-delayed spectroscopy of laser-polarized beams ground and isomeric state properties of 110-126Ag and 128-133In
β-decay of polarized 121-126Ag and 128-133In
LINO: Laser-induced nuclear orientation
D. Yordanov et al. French ANR funding scheme requested
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polarisation by optical pumping
µ & Q from nuclear magnetic resonance
β-delayed spectroscopy of laser-polarized beams
LINO: Laser-induced nuclear orientation
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CSNSM off-line validation
Rejuvenation of dilution cryostat
Preparation at Alto
Structural integration & beam-line design
CSNSM Orsay
LPSC Grenoble
IPN Orsay
INM Paris
University of Tennessee
University of Maryland
University of Oxford
University of Novi Sad
Polarex: Nuclear Orientation On-Line
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Proposed roadmap at Alto:
• Phase 1: install Valencia-Surrey TAS@ALTO (12 BaF2) at existing beam line,
for nuclei of interest that could be easily selected
• Phase 2: more challenging cases with laser ion source for selection, in parallel
with development of dedicated TAS beam line
• Phase 3: synergy with Bedo and Tetra for βn emitters and more exotic
isotopes. Common measurement campaigns with complementary beam lines?
• in parallel, new detector developments combining higher resolution with
efficiency such as LaBr3 or CeBr3 for Alto then Spiral-2
IFIC, Valencia
Subatech, Nantes
University of Surrey, Guildford
University of Jyväskylä
Ciemat, Madrid
Tas: Total Absorption Spectroscopy
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MONSTER
TONNERRE
BEDO
TAS
BELEN TETRA
Si-Cube
BESTIOL
DETRAP
MLL Trap
LPCTrap
PIPERADE
GPIB
LUMIERE
CRIS
b-NMR
Initiate the physics for Spiral-2 at Ganil:
Desir, S3, NFS
NFS
REGLIS
LINO
RIALTO
LICORNE
BEDO TETRA
LINO
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► Stable and Radioactive beam facility ► R&D on ISOL & RIB ► low-energy physics program based on photo-fission ► R&D and physics at ALTO pave the way to Spiral-2 at Ganil: initiate physics program, train new generation of ISOL physicists, develop instruments and methodologies