Accelerated Radioactive Ion Beams at TRIUMF: Present (ISAC-I) and Future (ISAC-II)

R.E. Laxdal, TRIUMF

ISAC-I at TRIUMF is now delivering both low energy and accelerated radioactive ion beams (RIBs) for experiment. The post-accelerator for ISAC-I includes a 35.3MHz RF Quadrupole (RFQ) to accelerate beams of A/q<=30 from 2keV/u to 153keV/u and a post-stripper, 106MHz variable energy drift tube linac (DTL) to accelerate ions of 3<=A/q<=6 to a final energy from 0.153 to 1.53MeV/u. Both linacs are room temperature and operate cw to preserve beam intensity. The accelerator was fully commissioned in early 2001 with first beam (8Li) to experiment in July last year. Since then both the DRAGON and TUDA facilities have received 21Na at various energies. The design concept, machine status and early operating experience of the ISAC-I linear accelerator complex will be summarized.

TRIUMF has also received funding through to 2005 to proceed with an extension to the ISAC facility, ISAC-II, to permit acceleration of radio-active ion beams up to energies of at least 6.5MeV/u for masses up to 150. In brief the proposed acceleration scheme would use the existing RFQ with the addition of an ECR charge state booster to achieve the required mass to charge ratio (A/q<=30) for masses up to 150.  A new room temperature IH-DTL would accelerate the beam from the RFQ to 400 keV/u followed by a post-stripper superconducting linac designed to accelerate ions of A/q<=7 to the final energy. The accelerator design and present status of the project will be presented. 

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