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ISOL cyclotron for the RISP

ISOL cyclotron for the RISP. Jong-Won Kim RI beam production systems team Institute for Basic Science/RISP June 26, 2015. Layout of the ISOL and In-flight systems for RI beam production. Injector. SCL1. High Energy Exp. 2. SCL2. SCL3. ISOL. Low Energy Exp.

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ISOL cyclotron for the RISP

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  1. ISOLcyclotron for the RISP Jong-Won Kim RI beam production systems team Institute for Basic Science/RISP June 26, 2015

  2. Layout of the ISOL and In-flight systems for RI beam production Injector SCL1 High Energy Exp. 2 SCL2 SCL3 ISOL Low Energy Exp. EBIS-CB Cryogenic System IFS Cyclotron High Energy Exp. 1 High radiation area Cyclotron

  3. Configuration of in-flight separator 238U beam energy: 200- 400 MeV/u Max. beam power: 400 kW Primary beam F1 beam dump HTS quadrupole Cryostat of quad triplet F5 F2 F6 Pre-separator Main separator F3 F4 Main specifications Dipole Dispersive focal plane: F1,F3, F5, F7 F7 Quadrupole Achromatic focal plane: F2 , F4, F8 degrader Sextupole F8

  4. Design of in-flight separator facility IFS floors Top view F1 F5 F2 F4 F6 F3 F7 1F Power supply Room (B1) Counting Room (B1) F8 B1 9 m 4 m 4 m 26.5 m 15 m B2 Side view 141 m 81 m 20 m 19.56 m 22.15 m 38 m 1F Power supply Room Counting Room B1 B3 B2 B3 Radiation dose map 1F: Air conditioning B1: Hot cell remote handling, Counting room B2:: Beam area, Vacuum pumps, etc. B3: Radiation waste, Drain tanks, Waste water storage 16O beam, 590 MeV/u, 400 kW [μSv/hr] Power supply and Counting rooms

  5. Design of the ISOL facility ISOL Driver: 35-70 MeV, H- 1 mA cyclotron Pre-Separator m/m = 300 RF cooler+EBIS+A/q MR-TOF RFQ Cooler 3 mm mrad, 1 eV EBIS Pre-separator Target/Ion Source Post linac The layout still evolving UCx target: 10 kW (Dia. 5 cm, 1.3 mm 19 disks) Cyclotron Test stand for target ion source, front-end mass separator on HV platform

  6. Design of the ISOL targets Target material for 10 kW: UCx Beam: 5 cm uniform

  7. Specification of commercial 70 MeV Cyclotrons Proposals in 2013

  8. Further specification of the cyclotrons

  9. Two previous meetings on 70 MeV H- cyclotron 1. Workshop on compact H- cyclotron for rare isotope production (Nov. 7-8, 2013)  Freddy Poirier (ARRONAX, France)  T. Zhang (CIAE, China)  R. Johnson (Best Cyclotron)  Y. Koyabu (Sumitomo)  Benoit Nactergal (IBA) 2. Cyclotron review meeting on 70 MeV H- cyclotron subsystem specification (April 3-4, 2014) T. Zhang (CIAE, China) L. Calabretta (INFN, Italy) A. Goto (Yamagata, Japan)

  10. Issues discussed in Workshops Scope of commercial order - Cyclotron (up to two switching magnets of the extraction ports) - Cyclotron + two beam delivery lines up to wobbler - Some major spare parts - Pulsed beam option Continuous operation with one carrousel (>10 days) - How many carbon foils in one carrousel? Stability of the beam current - How to monitor the beam current and beam shape? how accurately? - Any feedback to stabilize the beam current? Time constant? - Sudden beam current jump should be avoided. Can this be avoided? Other issues - Minimum time for beam stop in case of emergency - Any plan to measure carbon foil lifetime in beam current of 0.5-1 mA

  11. Uniform beam formation by wobbling method Initial beam distribution TRANSPORT calculation for two configurations (point to parallel focusing) wobbling pattern Dependence on the radius of gyration Uniformity and beam loss vs. radius of gyration Two parameters  beam width  radius of gyration

  12. Use of multipole magnet to reduce beam losses Use both multipole magnet and wobbling method  Flexible against beam shape variation Octupole on Octupole off Dependence on radius of gyration with use of octupole magnets Beam loss reduction 34%21% X (cm) Calculated by using GICOSY

  13. An injection beam line for pulsed beam (option) Pulsed beam for TOF measurement Proton beam time structure 0.01-1 MHz Vmax=3 kV SIMION simulation Time Pattern of pulsed HV Neutron beam

  14. Carbon foil extraction system Extracted beam emittance at different energies

  15. Heat generation on the foil by stripped electrons  Power deposit on carbon foil P = ∆W x I ∆W: beam energy loss I: current 70 MeV 1mA with 6mm, 1um thick target - Energy by protons : 1.7keV x 1x10-3A = 1.7 W - Energy by two electrons : 70MeV/1,836 x 2mA = 76 W After use for ~20,000 Ah

  16. Thermal test on stripper foil using electron linac

  17. Temperature variation on stripper foil Surface temperature on foil vs. e-beam current

  18. H- beam losses by Vacuum dissociation and Lorenz stripping Vacuum level: 1.0 x10-7 torr (N2 equivalent) From Tianju Zhang (CIAE)

  19. Locations of beam losses in ARRONAX cyclotron 1st measurements in march 2013 (Arronax/IBA team) Exit window for beamline • Machine: Some hot spots • 10 to 40 mSv/h: • Extractions windows • Radial probe • Around alpha deflector • No spot > 100mSv/h • Ambient > 3 mSv • No knowledge on built-up yet as 1st measurements • Beamlines: • Specific points along beamlines due to particles losses • Faraday cups • Collimators • impact on maintenance and dedicated strategies • Remove parts of accelerators before consequent build-up Radial probe Preliminary snapshot F. Poirier (CNRS/Arronax), Nov. 2013

  20. A plan for the proton cyclotron of RISP Budget allocated for an ISOL cyclotron at RISP : ~14 M$ By Luciano Calabretta (May 2015)

  21. Project schedule for cyclotron installation ~54 months * Our building construction schedule is tight, so we may need a provision to delay the delivery up to one year.

  22. Concluding remarks • We want to immediately startinternational collaboration to design an A/q=2 cyclotron provided that cyclotron experts agree the RISP plan for ISOL cyclotron is attractive to commercial vendors. • We want to have preliminary quotations from the vendors, which includes the cost, construction period, risk management and so on. planto make the contract in 2015. • If we have to take a review process in Korea to revise from 70 MeV H- to 40A MeV A/q=2, recommendation letters from international experts would be greatly appreciated.

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