Gator: A hybrid spectral/PIC formulation of the interaction of electron beams with slow-wave structures

Journal Article · Sat Feb 01 04:00:00 EST 1997 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.52335· OSTI ID:538313

Freund, H P ^[1]; Zaidman, E G ^[2]

---

1. Science Applications International Corp., McLean, Virginia 22102 (United States)
2. Naval Research Laboratory, Washington, Distict of Columbia 20375 (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 {ital 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{close_quote}s equation, and solved in conjunction with the 3-D Lorentz force equations. The model is compared with linear theory. {copyright} {ital 1997 American Institute of Physics.}

• Sponsoring Organization: USDOE
• OSTI ID: 538313
• Report Number(s): CONF-9609256--
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 391; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
BEAM DYNAMICS
BEAM TRANSPORT
CAVITY RESONATORS
DISPERSION RELATIONS
ELECTRON BEAMS
LORENTZ FORCE
MATHEMATICAL MODELS
NONLINEAR PROBLEMS
THREE-DIMENSIONAL CALCULATIONS