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Crab Cavity Study with GDFIDL

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

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Crab Cavity Study with GDFIDL

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

  2. 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. R.M. Jones et al.,linac 2006 20/12/06

  3. Crab Cavity • TM110 dipole mode is used to operate. • Cavity shape and field structure • (G. Burt and P. Goudket) 20/12/06

  4. Simulation • 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 SOMscan also be excited in the cavity. - These mode can disrupt the bunches. • Shape of one cell model by GDFIDL 20/12/06

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

  6. Results • Arrow plots of E-field Monopole @ 2.75 GHz dipole @ 4.10 GHz Quadupole @ 5.45 GHz Sextupole @ 6.74 GHz 20/12/06

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

  8. Summary • Crab cavity uses TM110 dipole mode to rotate the • beam in order to achieve an effective collision. • The frequency modes of Crab cavity are studied • by GDFIDL. 20/12/06

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