Gator: A hybrid spectral/PIC formulation of the interaction of electron beams with slow-wave structures
- Science Applications International Corp., McLean, Virginia 22102 (United States)
A time-dependent nonlinear analysis of a helix traveling wave tube is presented for a beam propagating through a sheath helix surrounded by a conducting wall. The effects of dielectric- and vane-loading are included as is the tapering of the helix pitch. Dielectric-loading is described when the gap between the helix and the wall is uniformly filled. Vane-loading describes the insertion of vanes running the length of the helix. The field is represented as a superposition of azimuthally symmetric waves in vacuo. An overall explicit sinusoidal variation is assumed, and the polarization and radial variation of each wave is determined by the boundary conditions in a vacuum circuit. The propagation of each wave as well as the interaction with the beam is included by allowing the amplitudes of the waves to vary in z and t. A dynamical equation is derived analogously to Poynting's equation, and solved in conjunction with the 3-D Lorentz force equations. The model is compared with linear theory.
- OSTI ID:
- 21165547
- Journal Information:
- AIP Conference Proceedings, Vol. 391, Issue 1; Conference: 1996 computational accelerator physics conference, Williamsburg, VA (United States), 24-27 Sep 1996; Other Information: DOI: 10.1063/1.52335; (c) 1997 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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