THE SUPER SEPARATOR SPECTROMETER S 3

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1 THE SUPER SEPARATOR SPECTROMETER S 3 Hervé Savajols (GANIL)

2

3 LINAC stable beams Very high intensity stable beams over a wide mass range Very high intensity stable beams over a wide mass range pps Energy = 2-15 A.MeV pps Today pps Above one or two order of magnitudes higher than present facilities Open new opportunities in several physics domains Open new opportunities in several physics domains

4 Physics objectives N=Z nuclei Tests of Shell Model Shape coexistence Proton Dripline Single-Particle structure Development of Collectivity Ground-State Properties New isotopes Heavy and Superheavy Elements Synthesis Spectroscopy and Structure Ground-State Properties Chemistry S3 Letter of Intents for SPIRAL2, 2006 S3 Physics white book, June 2008 Letter of Intents for day one experiments, Sept Neutron-Rich Nuclei Single-Particle structure Quenching of Shell Gaps Ground-State Properties New isotopes

5 The ensemble is important Not only high Beam intensity is needed, but also: Targets, which can survive to extremely high intensity Separators, which can clean rare events from huge beam intensities Detection systems, which provide non-ambiguous identification Physics of rare events requires solutions studied as an ensemble : Beam-Target-Separator-Detection

6 High power target stations Stable 208 Pb, 209 Bi, Ni, Ca, C ( R 35 cm) Actinides 232 Th, 238 U, 239 Pu, 242 Pu, 244 Pu, 248 Cm, 249 Cf 45 mg Bq ( R=4-15 cm) Beam hole Used as prototype in 2009 Target Prototype ready end 2009 session - Wednesday June 17th at 9 am Target thickness and homogeneity - RBS method - Electron gun - Pyrometer - Infrared cameras - Scintillators e- Beam Diagnosis R. Mann (patent # DE A1) GANIL & Irfu

7 Reaction types to be addressed at S3

8 Optics : Basic design (Argonne NL) Principle : Two-stage selection (Bρ & m/q) that will achieve very good rejection of both the beam and adjacent mass channels of reaction products MAMS : Magnetic Achromat and Mass Separator - 8 identical multiplets (3 or 4 multipoles) Target 2 magnetic dipoles Intermediate FP Mass Separator 1 electric dipole 1 magnetic dipole Mass separator Final FP Momentum Achromat Large angular acceptance : +/- 50 mrad X and Y Large Charge state acceptance : Bρ acceptance: +/- 10% Rejection of the beam : >10 13 M/q selection : 1/300 resolution NIM B 266, 4162 (2008)

9 Mass resolution of the full system 48 Ca+ 248 Cm n Beam parameters 48 Ca Recoil parameters E <Br> <Er> <Q> <V> Ęq (±2 ) dq dp/p[%] [MeV/n] [Tm] [MV] [cm/ns] [mrad] (±2 ) ± 8 ± ± 50 (Y) ± 50 (X) ± 2 ±2.3 Target Momentum Dispersion [x/δ=13 mm/%] QuickTime et un décompresseur TIFF (non compressé) sont requis pour visionner cette image. Intermediate Focal point Mass resolution M/q dispersion (For 5Q) [6.7 mm/%] y (mm) 58 Ni+ 46 Ti 100 Sn + 4n x (mm)

10 Transmission of the full system 48 Ca+ 248 Cm n 58 Ni+ 46 Ti 100 Sn + 4n Losses ( % ) Transmission ~ 53 % 10% First bend Position ( m ) 20% Suppressors Optical design session - Tuesday June 16th at 3 pm 8 TraceWin - CEA/DSM/IRFU/SACM 3% Second bend ANL & GANIL Monte Carlo simulations Irfu Monte Carlo simulations

11 Base detection system Decay spectroscopy setup α,γ,e - (Gabriella-Dubna,Great-JYFL ) γ detection Exogam = 32 canaux Front-end electronic DAQ & command/control (trigerless, digital processing) Detection session - Wednesday June 17th at 10:50 am Time of flight + tracking detection = 200 canaux Tunnel detector for escaped e - and α = 40 canaux Σ = ± 600 canaux Implantation detector (HI, α and e - decay) = canaux IPHC/CSNSM/Irfu/GANIL/GSI/JYFL

12 S 3 Low energy branch ANL/KU Leuven/GANIL

13 Connection to DESIR Low energy branch session - Wednesday June 17th at 2:15 pm

14 Infrastructure J.M Lagniel talk - Tuesday June 16th at 2 pm September 08 : Choise of the Project Management Team ( MOE ) May 09 : request for the building permit

15 Summary New physics opportunities are opened with the LINAC high intensity beams, like in-flight mass measurement of super-heavy elements, or studies of very weak evaporation channels ( like 100 Sn ) Technically the project will be ready in 2010 to start the construction phase First experiment plan in 2013 The goal of the workshop is : to look at Day 1 SPIRAL2 Phase 1 experiments to be carried out at S3 in to have status reports on the project's technical aspects.

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