• V.P. Yakovlev, I.G. Gonin, N. Solyak
  Fermilab, Batavia
• I.K. Drozdov, N. Perunov
  MIPT, Dolgoprudniy, Moscow Region

Long 11-cell, beta=0.81 L-band structure is considered as an initial stage of the high-energy part of the Project-X in order to accommodate to a standard CM4 cryomodule. The cavity shape is optimized for maximal energy gain providing the same time field flatness along the structure not worse than for ILC beta=1 cavity, and the same ratio of surface magnetic field to electric field. The results of spectrum analysis for monopole and dipole HOMs is presented as well as the HOM damper design.