Journal ArticleDOI
Methods of finding the parameters of ideal current loops for computer simulation of magnetic fields
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TLDR
In this paper, the position, radius, and strength of ideal current loops to represent the magnetic field of a partially immersed convergent electron gun, a short solenoid, using the Helmholtz concept extended to triplets and quadruplets, and a periodic permanent magnet focusing stack for a TWT were described.Abstract:
Methods are described for finding the position, radius, and strength of ideal current loops to represent the magnetic field of 1) a partially immersed convergent electron gun, 2) a short solenoid, using the Helmholtz concept extended to triplets and quadruplets, and 3) a periodic permanent magnet (P.P.M.) focusing stack for a TWT. The parameters of the coils then constitute a complete description of the magnetic field with no paraxial approximation.read more
Citations
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Journal ArticleDOI
Microwave studies of a tunable free‐electron laser in combined axial and wiggler magnetic fields
TL;DR: In this paper, measurements of narrow-band (Δω/ω≤0.02) microwave emission from a tunable (7≤ω/2π≤21 GHz) Raman free-electron laser operating in a single TE11 waveguide mode are reported.
Book ChapterDOI
Electron Beam Formation, Focusing, and Collection in Microwave Tubes
TL;DR: In this paper, the authors describe the design of beam optical systems used in traveling wave tubes (TWTs) and high power klystrons because of their widespread use in modern microwave tubes.
Journal ArticleDOI
Analytical prediction and experimental verification of TWT and depressed collector performance using multidimensional computer programs
TL;DR: A comparison of experimental with computed results is presented for two high-performance octave-bandwidth TWT's, with multistage depressed collectors, with very good agreement between the computed and measured collector efficiencies.
Journal ArticleDOI
A matrix solution for the simulation of magnetic fields with ideal current loops
TL;DR: In this article, a matrix formulation for describing axisymmetric magnetic field data with ideal current loops is presented, and a computer program written in APL is used to invert the matrix and hence to solve for the coil strengths which are used to represent the field data.
Journal ArticleDOI
An iterative approach for the 3-D representation of focusing axisymmetric magnetic fields in TWT collectors
Salvatore Coco,Antonino Laudani +1 more
TL;DR: In this paper, a new efficient iterative procedure is presented for the computation of the equivalent ideal loop representation of the focusing axisymmetric magnetic field inside traveling wave tube (TWT) collectors.
References
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Journal ArticleDOI
Representation of axisymmetric magnetic fields in computer programs
TL;DR: In this paper, the standard expression for the off-axis fields in terms of the axial values and their differentials is examined, and it is shown that if terms higher than the second are used, the accuracy becomes worse instead of better, unless the input data are mathematically perfect.
Journal ArticleDOI
Computer-aided design of an axially symmetrical magnetic circuit and its application to electron-beam-focusing devices
TL;DR: In this article, a method of computer simulation useful for analysis of an axially symmetrical magnetic circuit with exciting coils, magnetic poles, and permanent magnets is presented, and the vector magnetic potential is obtained by the use of the well-known successive over-relaxation method, so that devices having magnetic hysteresis characteristics can be analyzed easily and accurately.