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Grassellino, A.

Paper Title Page
THP002 The 1.3 GHz Superconducting RF Program at TRIUMF 774
 
  • R.E. Laxdal, K. Fong, A. Grassellino, A.K. Mitra, I. Sekachev, V. Zvyagintsev
    TRIUMF, Vancouver
  • R.S. Orr, W. Trischuk
    University of Toronto, Toronto, Ontario
 
 

TRIUMF is proposing to build a 50 MeV electron linac as a driver to produce radioactive ion beams through photofission. The present design calls for the use of nine-cell 1.3 GHz Tesla type cavities. A 1.3 GHz Superconducting RF (SRF) program has been initiated with the goal to produce and test one nine cell cavity by the end of 2009. The program will utilize the existing clean room and SRF test facilities that support the ISAC-II heavy ion superconducting linac. A vertical cryostat has been modified with a new insert to allow single cell testing. Pumps for 2 K sub-atmospheric operation have been tested. A single cell fabrication program is being initiated with a local company. A RRR measurement program is on-going to test cavity welds. The goal of the 1.3 GHz upgrade is to not only produce cavities for the in house project but to broaden TRIUMF's technical base for future potential collaborations. The paper will report the progress and plans of the 1.3 GHz SRF program.

 

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Slides

 
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.