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Title of Journal: Hyperfine Interact

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Abbravation: Hyperfine Interactions

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Springer Netherlands

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DOI

10.1007/bf00312730

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ISSN

1572-9540

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CARIBU a new facility for the study of neutronri

Authors: G Savard R C Pardo S Baker C N Davids A Levand D Peterson D G Phillips T Sun R Vondrasek B J Zabransky G P Zinkann
Publish Date: 2011/05/03
Volume: 199, Issue: 1-3, Pages: 301-309
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Abstract

The Californium Rare Ion Breeder Upgrade CARIBU to the ATLAS superconducting linac facility is currently being commissioned It provides lowenergy and reaccelerated beams of neutronrich isotopes obtained from 252Cf fission The fission products from a 252Cf source are stopped in a large highintensity gas catcher thermalized and extracted through an RFQ cooler accelerated to 50 kV and mass separated in a highresolution separator before being sent to either an ECR charge breeder for postacceleration through the ATLAS linac or to a lowenergy experimental area This approach gives access to beams of very neutronrich isotopes many of which have not been available at low or Coulomb barrier energies previously These beams provide unique opportunities for measurements along the rprocess path To take advantage of these unique possibility the reaccelerated beams from CARIBU will be made available at the experimental stations of ATLAS to serve equipment such as Gammasphere HELIOS and the reaction spectrometers In addition the Canadian Penning Trap CPT mass spectrometer has been moved to the CARIBU lowenergy experimental area and a new injection line has been built The new injection line consists of a RFQ buncher sitting on a 50 kV highvoltage platform that will accumulate the mass separated 50 kV radioactive beams cool and extract them as a pulsed beam of 3 keV This beam can be sent either to a tape station for diagnostics and tuning or a cryogenic linear trap for preparation before transfer to the highprecision Penning trap where the mass measurements will take place Initial CARIBU commissioning is proceeding with a 2 mCi source that will be replaced by a 100 mCi source as the commissioning proceeds Final operation will use a 1 Ci source and attain yield in excess of 107 ions/sec for the most intense beams at low energy an order of magnitude less for reaccelerated beams

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