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Overview of the U.S. Rare Isotope Accelerator Proposal

This overview highlights the scientific case for the Rare Isotope Accelerator (RIA), its important technical features, and the various production mechanisms and targets used for rare isotope research. It also discusses the RIA Driver Linac and Post-accelerator, as well as the next-generation instrumentation for research with rare isotopes.

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Overview of the U.S. Rare Isotope Accelerator Proposal

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  1. Overview of the U.S. Rare Isotope AcceleratorProposal Jerry Nolen Physics Division Indo-US Working Group Meeting FNAL, August 6, 2004

  2. What Is RIA? • RIA is a next-generation facility for basic research in nuclear physics • RIA will be a dream-world for addressing open questions in low-energy nuclear physics • RIA will deliver radioactive beams of unprecedented intensity and variety using both ISOL & In-flight methods

  3. The Scientific Case for Rare Isotope Beams • The Origin of the Elements • The Limits of Nuclear Stability • Properties of Nuclei with Extreme Neutron to Proton Ratios • Properties of Bulk Neutron Matter and the Nature of Neutron Stars • Quantum Mechanics of Mesoscopic Systems • Tests of Fundamental Interactions

  4. Nuclear Astrophysics

  5. Rare Isotopes Surround the Valley of Stability

  6. Schematic of the RIA Facility

  7. Important Technical Features of RIA ·High power CW SC Linac Driver (1.4 GV, 400 kW) Advanced ECR Ion Source Accelerate 2 charge states of U from ECR All beams: protons-uranium Superconducting over extended velocity range: 0.2 – 900 MeV/u Multiple-charge-state acceleration after strippers Adapted design to use both SNS cryomodules RF switching to multiple targets ·Large acceptance fragment separators 1)    “Range Bunching” + Fast gas catcher for ISOL 2)    High resolution and high purity for in-flight ·High power density ISOL and fragmentation targets Liquid lithium as target for fragmentation and cooling for n-generator ·Efficient post-acceleration from 1+ ion sources ·Next-generation instrumentation for research with rare isotopes

  8. RIA Driver Linac Structure With Multiple Charge State Capability Ken Shepard and Petr Ostroumov

  9. Partial Beam list for the RIA Driver Linac 400 kW beam power

  10. ECR Ion Source Development for RIA Claude Lyneis and Daniela Leitner

  11. Two-charge-state RFQ and SC interdigital section are required to obtain minimum uranium beam power See Ostroumov and Kolomiets, LINAC2000

  12. CW RFQ for the Driver Linac Frequency 57.5 MHz Length 4 m Tank diameter 56 cm Inter-vane voltage 67.5 kV R0 6.0 mm Prf 45 kW Petr Ostroumov Simultaneous acceleration of 2-charge state uranium beam.

  13. SC Cavities for the RIA Driver

  14. Superconducting linacs for driver and post accelerator A superconducting linac cryomodule currently in use at the ANL/ATLAS heavy-ion facility.

  15. Intermediate-velocity SC Drift-tube Cavities 345 MHz,  =.4 115 MHz,  =.15 172.5 MHz,  =.25

  16. First results from prototype double-spoke Ken Shepard and Mike Kelly

  17. Concept for a Triple-spoke Resonator • A 345-MHz triple-spoke resonator is being considered as an alternative to the 805-MHz reduced-beta elliptical resonators

  18. Elliptical-cell high-beta cavities Beta 0.61 & 0.81 cavities developed by JLab for the SNS Beta 0.48 cavities developed by NSCL & JLab for RIA

  19. ANL-NSC 97 MHz QWR Cavities for the New Delhi Booster Linac ANL Physics Division Annual Report 1999 Resonator Construction Project (K. W. Shepard, P. Potukuchi*, S. Ghosh*, A. Roy*, and M. Kedzie) Construction of the first twelve niobium quarter-wave cavities has been completed. Shipment of the cavities to New Delhi awaits removal of the Nuclear Science Centre from the proscribed entity list by the U. S. DOE Office of Non-proliferation. The completion of twelve cavities within the budget and schedule allotted for ten cavities was made possible by the increase in productivity in the electron-beam welding process that was achieved during this project in collaboration with the e-beam welding vendor, Sciaky, Inc.

  20. Production Target Areas and Beam Sharing Low-Z fragmentation targets High-Z ISOL targets

  21. A Variety of Targets and Production Mechanisms

  22. Rare Isotope Production Schemes

  23. Predicted yields of Sn isotopes Yields predicted for Sn isotopes from a variety of production mechanisms. Yields are above 1/s from 100Sn to 140Sn. See C.L. Jiang, et al., NIM A492 (2002) 57.

  24. Windowless Liquid Lithium Target

  25. Picture of liquid-lithium jet in vacuum 5-mm x 10-mm liquid-lithium jet flowing at 10 m/s in vacuum (5-mm wide in this view)

  26. 1-MeV Electron Beam Heating Power density in MeV/cm3 per electron 30-kW electron beam Simulates both power density and total power of 100-kW U beam. Simulations by: I. Gomes

  27. Energy bunching/fast gas catcher concept

  28. Assembly of full-scale RIA gas cell prototype ~20% extraction efficiency for 25Al early in first on-line tests at ATLAS! 3 drift sections + RF cone Prototype inside HV cage Guy Savard

  29. RIA Post-accelerator • Can accelerate, starting from singly charged, ions with mass up to 240 amu from ion source energy to energies above Coulomb barrier • High-acceptance CW operation • Uses novel low-frequency CW split-coax RFQ and two H-RFQ structures to inject into low-b superconducting cavities

  30. Accelerating Structure for the Hybrid-RFQ f=12.125 MHz 240U+1 V=100 kV Pcalculated=11 kW L=3.5 m Winj= 7 keV/u Wexit=22 keV/u

  31. Instrumentation for research with rare isotopes Next-generation recoil separator developed for ISAC in Vancouver

  32. Status of RIA NSAC 2002 Recommendation:The Rare Isotope Accelerator (RIA) is our highest priority for major new construction. R&D: Nine labs and universities in the U.S. are participating in R&D for the RIA project. MSU & ANL are working together to develop a cost-effective technical plan. Both institutions would like to be the site of RIA. Optimistic time line for RIA DOE Critical Decision 0 in 2003, followed by 3 years of design and 4 years of construction. Commission in 2010.

  33. Summary • RIA combines new linear accelerator developments with advanced isotope production and separation technologies. • RIA has the advantages of both precise low energy re-accelerated beams and fast in-flight-produced beams. • It is a facility designed to provide universal access to beams of all radioactive species at the energies required to best extract the physics sought.

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