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Overview of the Spiral 2 project Specific constraints for the vacuum system

Overview of the Spiral 2 project Specific constraints for the vacuum system. P. Dolégiéviez patrick.dolegieviez@ganil.fr. Spiral 2 project at GANIL. GANIL : national heavy ions laboratory (CEA/CNRS) in operation since 1983

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Overview of the Spiral 2 project Specific constraints for the vacuum system

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  1. Overview of the Spiral 2 project Specific constraints for the vacuum system P. Dolégiéviez patrick.dolegieviez@ganil.fr

  2. Spiral 2 project at GANIL • GANIL : national heavy ions laboratory (CEA/CNRS) • in operation since 1983 • main applications : fundamental research in nuclear physic, astrophysic, radiobiology, materials science. • accelerated beams : • stable beam : Carbone to Uranium ( 0,5 – 95 MeV/u) • radiactive ion beams produced by fragmentation (A< 80, 1,7 – 25 MeV/u)

  3. Spiral 2 project principle UCx UCx 2000°C 2000°C C C deutons diffusion / effusion diffusion / effusion 40 40 MeV MeV neutrons neutrons 1+ 1+ n+ n+ Source Source goal : produce radioactive ion beams (RIBs) by fission reactions technique used : use a high intensity primary beam to produce an high neutron flux on a fissile target primary beams -> 5 mA secondary beams -> 109pps (Sn132) to 1012pps (He)

  4. Spiral 2 project : 2 phases GANIL with SPIRAL 2 n+ beam lines to GANIL 1+ / n+ DESIR BE RIBs RIBs 1+ beam lines, HR spectrometer, RFQ cooler production RIBs S3 : Super SeparatorSpectrometer HE beam lines 2 ions sources q/A=1/2 , 5 mA q/A=1/3 , 1mA RFQ NFS : Neutrons For Science Superconducting linac, 40MeV d, 14.5MeV/u HI

  5. Spiral 2 vacuum levels specifications Beam losses by charge exchange with residual gas (1) space charge compensation (2) warm sections close to CM Ions beam transmission in residual gas for low energy beam lines (schlachter model) cross sections in N2 equiv. sc (Ar 14+) = 2.10-18 m2 sc (Xe 47+) = 8.10-18 m2

  6. Production hall • safety constraints • beam transmission • Accelerator • beam transmission • superconductive cavities Specific constraints for the design of the Spiral 2 vacuum system • goals : • linac and HE beam lines losses < 1 W/m • individual integrated doses < 2mSv/year • High energy beam lines • safety constraints

  7. SPIRAL 2 SClinac • 19 cryomodules • 26 Nb cavities / 4,2 K / 6,5 MV/m • P cryo = 1,1kW@4,2 K • P beam max = 200 kW (D+) 3 m • SC linac configuration : vacuum chamber between each cryomodule at room temperature (with beam focalization, beam diagnostics and pump)

  8. SPIRAL 2 SClinac SC cavities assembly in cleanroom Cryomodule assembly (cavities under vacuum) Cryomodule in test

  9. RIBs production facility target (UCx) 1014 fissions/s run max 3 months RIBs: from 102-103pps to 1012pps A => 238 linac Production zone (intervention by robot) Id. DESIR GANIL 1+/n+ HRS Id. maintenance area for the production zone

  10. Specific contraints for RIBs vacuum system Production hall : critical in terms of safety U target activity A~ 1014 Bq with ~ 80% transmitted by gases • must be coupled with gases storage system (all gases are stored during 3 months before exhaust) • must insure the first static confinment barrier • 1.10-8 < Pm (mb) <1.10-5 with robotic maintenance Vacuum system • the vacuum system must reduce the gases transfert in the beam lines closest the production zone (specific pumping and high efficency cryogenic trap)

  11. Spiral 2 vacuum system => Some of our main topics of interest • Reliability of the SC linac and HEBT vacuum system with high power beams • Equipments behavior under radiological environment (valves, gauges,TMP) …107 Gy/y for some areas • Transmission of volatile contamination through the beam lines and vacuum pipes • Designing a global exhaust gas storage system, taking into account the H2 risk • Design of vacuum systems with maintenance operation by teleoperation

  12. SPIRAL 2 project milestones • Phase 1 • October 2010 : permit of construction delivered • 2nd half 2012 : installation of equipments • Phase 2 • 1st half 2011 : conceptual design of buildings (APD) • summer 2011 : data for the preliminary safety studies 03/2011 construction site Phase 1

  13. Questions? • If so please contact Patrick directly by email!  Patrick.dolegieviez@ganil.fr

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