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Ashmanskas, B.

Paper Title Page
WEPMS009 Results on 9-cell ILC and 9-cell Re-Entrant Cavities 2343
 
  • H. Padamsee, A. C. Crawford
    CLASSE, Ithaca
  • B. Ashmanskas
    Fermilab, Batavia, Illinois
  • M. D. Cole, A. J. Favale, J. Rathke
    AES, Princeton, New Jersey
  
  Funding: DOE

We have recently upgraded our chemical treatment, high pressure rinsing systems and low temperature RF testing system to prepare and test 9-cell cavities for ILC. After removal of 120 um by BCP we reached 26 MV/m accelerating field limited by the high-field Q-slope. There was no quench and no field emission, showing that our facilities are well qualified. We have also extended our vertical electropolishing system to 9-cell cavities. Previously we have successfully used vertical electropolishing for one-cell cavities of the re-entrant shape to reach 47 MV/m accelerating. Test results on 9-cell electropolished cavities will be presented. AES has manufactured the first 9-cell cavity with re-entrant cell shapes. The surface magnetic field is 10% lower than for the standard TESLA-shape cavity. Half-cells were electropolished 100 um before welding. We will present results on the first tests of the 9-cell re-entrant cavity.