Crab Cavity Study with GDFIDL Narong Chanlek and Roger Jones 20/12/06.

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Presentation transcript:

Crab Cavity Study with GDFIDL Narong Chanlek and Roger Jones 20/12/06

Crab Cavity Crab cavities are used for the ILC in order to increase the luminosity of the colliding beams at the interaction point. These cavities use dipole electric field to kick the bunches into a suitable angle. 20/12/06 R.M. Jones et al.,linac 2006

Crab Cavity TM 110 dipole mode is used to operate. Cavity shape and field structure (G. Burt and P. Goudket) 20/12/06

Simulation Shape of one cell model by GDFIDL GDFIDL (finite difference algorithms) is used to simulate. Higher order modes (HOMs), lower order modes (LOMs) and same order modes (SOMs) are characterized. Why do we need to simulate: - HOMs, LOMs and SOMs can also be excited in the cavity. - These mode can disrupt the bunches. 20/12/06

Cavity Shape Geometric parameters of the cavity shapes 20/12/06 5 cell Niobium prototype cavity Schematic view of the cavity shape

Results Arrow plots of E-field 2.75 GHz 5.45 GHz 4.10 GHz 6.74 GHz 20/12/06

Results Dispersion diagram for single-cell Crab cavity Mode used for bunch DEFLECTION  3.9 GHz 20/12/06 Light line plot

Summary 20/12/06 Crab cavity uses TM 110 dipole mode to rotate the beam in order to achieve an effective collision. The frequency modes of Crab cavity are studied by GDFIDL.