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Dawson, R.J.

Paper Title Page
MOP018 ISAC-II Superconducting Linac Upgrade - Design and Status 97
  • R.E. Laxdal, R.J. Dawson, M. Marchetto, A.K. Mitra, W.R. Rawnsley, T.C. Ries, I. Sekachev, V. Zvyagintsev
    TRIUMF, Vancouver

The ISAC-II superconducting linac, operational since April 2006, adds 20 MV accelerating potential to the ISAC Radioactive Ion Beam (RIB) facility. An upgrade to the linac, in progress, calls for the addition of a further 20 MV of accelerating structure by the end of 2009. The new installation consists of twenty 141 MHz quarter wave cavities at a design beta of 11%. The cavities will be housed in three cryomodules with six cavities in the first two cryomodules and eight cavities in the last. A second Linde TC50 refrigerator has been installed and commissioned to provide cooling for the new installation. The design incorporates several new features as improvements to the existing cryomodules. They include a four point support frame for the cavity strongback, a modified LN2 circuit internal to the cryomodule and a new design for the mechanical motion of the rf coupling loop. A summary of the design and the current status of the cryomodule production and supporting infrastructure will be presented.

TUP002 ARIEL and the TRIUMF E-Linac Initiative, a 0.5 MW Electron Linac for Rare Isotope Beam Production 383
  • S.R. Koscielniak, F. Ames, R.A. Baartman, I.V. Bylinskii, R.J. Dawson, J.T. Drozdoff, K. Fong, A. Hurst, R. Keitel, R.E. Laxdal, F. Mammarella, M. Marchetto, L. Merminga, A.K. Mitra, K.W. Reiniger, T.C. Ries, R. Ruegg, I. Sekachev, G.M. Stinson, V.A. Verzilov
    TRIUMF, Vancouver
  • D. Karlen
    Victoria University, Victoria, B.C.

TRIUMF, in collaboration with university partners, proposes to construct a megawatt-class electron linear accelerator (e-linac) as a driver for U(γ,f) of actinide targets for nuclear astrophysics studies, and 9Be(γ,p)8Li for beta-NMR materials science. The e-linac is part of a broader proposal for an expansion of the TRIUMF rare isotope beams capability through a new facility to be named ARIEL. The e-linac design and prospects for funding are elaborated.

THP003 Production and Testing of Two 141 MHz Prototype Quarter Wave Cavities for ISAC-II 777
  • R.E. Laxdal, R.J. Dawson, K. Fong, A. Grassellino, M. Marchetto, A.K. Mitra, T.C. Ries, V. Zvyagintsev
    TRIUMF, Vancouver
  • R. Edinger
    PAVAC, Richmond, B.C.

The medium beta section of the ISAC-II superconducting linac (β=5.7% and 7.1%) has been operational since April 2006 providing 20 MV of accelerating potential at 106 MHz. The ‘high beta' extension to the linac, in progress, will see the addition of twenty 141 MHz quarter wave cavities at β=11%. The design specification calls for cw operation at a voltage gain of at least 1.1 MV/cavity for no more than 7 W of power dissipated in the cavity. This operation point corresponds to challenging peak surface fields of 30 MV/m and 60 mT. The cavity design is similar in concept to the medium beta cavities except for the addition of a drift tube to render symmetric the accelerating fields. A prototyping and qualification program was initiated with PAVAC Industries Inc. of Richmond, B.C. Two full size models in copper and two in niobium have been completed. The niobium cavities have been warm and cold-tested and characterized for frequency, rf performance and mechanical stability. The cold performance of both cavities exceeds the specification and the final frequency is within tuning range. The design, fabrication details and test results will be presented.