• F. Furuta, K. Saito
  KEK, Ibaraki
• G.V. Eremeev, R.L. Geng
  JLAB, Newport News, Virginia
• T. Konomi
  Sokendai, Ibaraki

In 2008, KEK and Jlab did the collaboration of S0-study on ICHIRO 9-cell #5 which has no end groups on beam tubes. As S0 tight loop test, surface treatments and vertical tests were repeated on ICHIRO#5 at both of Jlab and KEK. Maximum gradients of 36.5MV/m at Jlab and 33.7MV/m at KEK were achieved so far. In this year, 2010, KEK and Jlab started new S0-study collaboration on ICHIRO 9cell #7 which has full end groups on beam tubes. ICHIR#7 was already sent to Jlab and VT as received was done. We will report the results of tight loop tests at Jlab.

• T. Tajima, L. Civale, T. Doi, G.V. Eremeev, N.F. Haberkorn, M. Hawley, A. Matsumoto, R.K. Schulze, A.T. Zocco
  LANL, Los Alamos, New Mexico
• V.A. Dolgashev, J. Guo, D.W. Martin, S.G. Tantawi, C. Yoneda
  SLAC, Menlo Park, California
• B. Moeckly
  STI, Santa Barbara, California

In order to overcome the theoretical limit of ~200 mT peak surface magnetic field for niobium SRF cavities, an idea of coating multi-layer thin film superconductors separated with thin dielectric layers has been suggested. We are testing MgB2, NbN and NbC as candidates for the realization of this idea. The results of surface characterization, Auger depth profile, DC magnetization measurements with SQUID, low- and high-field measurements with a TE013-like mode copper cavity coupled with a 11.4 GHz short-pulse Klystron will be presented.