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Design of the detuned accelerator structure

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2 Author(s)
Wang, J.W. ; Stanford Linear Accel. Center, Stanford Univ., CA, USA ; Nelson, E.M.

This is a summary of the design procedure for the detuned accelerator structure for SLAC's Next Linear Collider program. The 11.424 GHz accelerating mode of each cavity must be synchronous with the beam. The distribution of the disk thicknesses and lowest synchronous dipole mode frequencies of the cavities in the structure is Gaussian in order to reduce the effect of wake fields. The finite element field solver YAP calculated the accelerating mode frequency and the lowest synchronous dipole mode frequency for various cavity diameters, aperture diameters and disk thicknesses. Polynomial 3-parameter fits are used to calculate the dimensions for a 1.8 m detuned structure. The program SUPERFISH was used to calculate the shunt impedances, quality factors and group velocities. The RF parameters of the section like filling time, attenuation factor, accelerating gradient and maximum surface field along the section are evaluated. Error estimates are discussed and comparisons with conventional constant gradient and constant impedance structures are be presented

Published in:

Particle Accelerator Conference, 1993., Proceedings of the 1993

Date of Conference:

17-20 May 1993

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