crab cavity study with gdfidl
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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
• TM110 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
Monopole
@ 2.75 GHz
Quadupole
@ 5.45 GHz
dipole
@ 4.10 GHz
Sextupole
@ 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 TM110 dipole mode to rotate the
beam in order to achieve an effective collision.
• The frequency modes of Crab cavity are studied
by GDFIDL.