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Miller, R.H.

Paper Title Page
MOPLS120 Mitigation of Emittance Dilution due to Transverse Mode Coupling in the L-band Linacs of the ILC 843
 
  • R.M. Jones, R.M. Jones
    UMAN, Manchester
  • R.H. Miller
    SLAC, Menlo Park, California
 
  The main L-band linacs of the ILC accelerate 2820 bunches from a center of mass of 10 GeV to 500 GeV (and in the proposed later upgrade, to 1 TeV). The emittance of the vertical plane is approximately 400 times less than that of the horizontal plane. Provided the vertical and horizontal mode dipole frequencies are degenerate, then the motion in each plane is not coupled. However, in reality the degeneracy will more than likely be removed with the eigen modes lying in planes rotated from the x and y planes due to inevitable manufacturing errors introduced in fabricating 20,000 cavities. This gives rise to a transverse coupling in the horizontal-vertical motion and can readily lead to a dilution in the emittance in the vertical plane. We investigate means to ameliorate this emittance dilution by splitting the horizontal-vertical tune of the lattice.