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Doleans, M.

Paper Title Page
TUPAS053 Beam Dynamics Studies for the Reacceleration of Low Energy RIBs at the NSCL 1769
  • X. Wu, G. Bollen, M. Doleans, T. L. Grimm, F. Marti, S. Schwarz, R. C. York, Q. Zhao
    NSCL, East Lansing, Michigan
  Funding: This work is supported by the U. S. Department of Energy

Rare Isotope Beams (RIBs) are created at the National Superconducting Cyclotron Laboratory (NSCL) by the in-flight particle fragmentation method. A novel system is proposed to stop the RIBS in a helium filled gas system followed by reacceleration that will provide opportunities for an experimental program ranging from low-energy Coulomb excitation to transfer reaction studies of astrophysical reactions. The beam from the gas stopper will first be brought into a Electron Beam Ion Trap (EBIT) charge breeder on a high voltage platform to increase its charge state and then accelerated initially up to about 3 MeV/u by a system consisting of an external multi-harmonic buncher and a radio frequency quadrupole (RFQ) followed a superconducting linac. The superconducting linac will use quarter-wave resonators with bopt of 0.047 and 0.085 for acceleration and superconducting solenoid magnets for transverse focusing. The paper will discuss the accelerator system design and present the end-to-end beam dynamics simulations.

TUPAS055 End-to-End Beam Dynamics Simulations of the ISF Driver Linac 1775
  • Q. Zhao, M. Doleans, T. L. Grimm, F. Marti, S. O. Schriber, X. Wu, R. C. York
    NSCL, East Lansing, Michigan
  A proposed Isotope Science Facility (ISF), a major upgrade from the Coupled Cyclotron Facility at the National Superconducting Cyclotron Laboratory (NSCL), will provide the nuclear science community with world-class beams of rare isotopes. The ISF driver linac will consist of a front-end and three acceleration segments of superconducting cavities separated by two charge-stripping sections, and will be capable of delivering primary beams ranging from protons to uranium with variable energies of ≥200 MeV/nucleon. The results of end-to-end beam simulation studies including physical misalignments, dynamic rf amplitude and phase errors, and variations in the stripping foil thickness, will be performed to evaluate the driver linac overall performances and beam loss, even for the challenging case of the uranium beam with multiple charge states using the newly-developed RIAPMTQ/IMPACT codes. The paper will discuss ISF beam dynamics issues and present the end-to-end beam simulation results.  
THPAS039 Status Report on the NSCL RF Fragment Separator 3585
  • M. Doleans, V. Andreev, B. Arend, D. Bazin, A. Becerril Reyes, R. Fontus, P. Glennon, D. Gorelov, P. F. Mantica, J. Ottarson, H. Schatz, B. Sherrill, J. Stoker, O. Tarasov, J. J. Vincent, J. Wagner, X. Wu, A. Zeller
    NSCL, East Lansing, Michigan
  The RF Fragment Separator (RFFS) proposed in* is now under construction and should be operational by May 2007. The RFFS is an additional purification system for secondary beams at the National Superconducting Cyclotron Laboratory after the existing A1900 fragment separator and will primarily be used to purify beams of rare neutron deficient isotopes. The RFFS uses a transverse electric field of an rf kicker to separate unwanted particles from the desired ion beam, a pi/2 phase advance cell to rotate the beam in phase space before the beam reaches a collimating aperture for purification and a final pi phase advance cell to transport the desired beam to the experiment. The final design for the rf kicker and the focusing system is presented and a status report on the building and commissioning effort is given.

* D. Gorelov, V. Andreev, D. Bazin, M. Doleans, T. Grimm, F. Marti, J. Vincent and X. Wu, "RF-Kicker System for Secondary Beams at NSCL/MSU" PAC2005, Knoxville, Tennessee, 16th-20th, May 2005

THPAS051 The RIAPMTQ/IMPACT Beam-Dynamics Simulation Package 3606
  • T. P. Wangler, J. H. Billen, R. W. Garnett
    LANL, Los Alamos, New Mexico
  • V. N. Aseev, B. Mustapha, P. N. Ostroumov
    ANL, Argonne, Illinois
  • K. R. Crandall
    TechSource, Santa Fe, New Mexico
  • M. Doleans, D. Gorelov, X. Wu, R. C. York, Q. Zhao
    NSCL, East Lansing, Michigan
  • J. Qiang, R. D. Ryne
    LBNL, Berkeley, California
  Funding: This work is supported by the U. S. Department of Energy, DOE contract number:W-7405-ENG-36

RIAPMTQ/IMPACT is a pair of linked beam-dynamics simulation codes that have been developed for end-to-end computer simulations of multiple-charge state heavy-ion linacs for future exotic-beam facilities. The simulations can extend from the low-energy beam transport after the ECR source to the end of the linac. The work has been performed by a collaboration including LANL, LBNL, ANL, MSU, and TechSource. The code RIAPMTQ simulates the linac front end including the LEBT, RFQ, and MEBT, and the code IMPACT simulates the main superconducting linac. The codes have been benchmarked for rms beam properties against previously existing codes at ANL and MSU. The codes allow high-statistics runs on parallel supercomputing platforms, such as NERSC at LBNL, as well as runs on desktop PC computers for low-statistics design work. We will show results from 10-million-particle simulations of RIA designs by ANL and MSU, carried out at the NERSC facility. These simulation codes will allow evaluations of candidate designs with respect to beam-dynamics performance including beam losses.