The shaping of dispersion characteristics in a variant of disc-loaded circular waveguide was studied through electromagnetic analysis for assessing the structure for wideband coalescence of the beamand waveguide-mode dispersion characteristics that entails the wideband gyro-travelling-wave tube (gyro-TWT) performance. In this variant of disc-loaded circular waveguide, the alternate dischole rad...

The interaction between a modulated, intense electron beam and a single-mode rf cavity is discussed. A formalism is described which accounts for steady-state and transient beam loading, input/output waveguide coupling, and finite Q effects. A circuit equation is analyzed for shorttime behavior. Algorithms are presented for designing detuned structures to ensure longitudinal stability in relativ...

The design and preliminary testing of a waveguide electron cyclotron resonance (ECR) heated plasma source is presented in this paper. The design utilizes resonant absorption of traveling microwaves to heat the discharge, avoiding any lifetime constraints on the device due to barium depletion or ion bombardment in more conventional devices. Results from magnetostatic calculations are presented, ...

A six-pole Q-band waveguide filter with a notch frequency above the has been developed for plasma diagnostics. The previous paper [Nishiura et al., J. Instrum. 10, C12014 (2015)] reported that exists within standard band. In this study, newly required extends function, which prevents thorny wave from being mixed into an instrument beyond bandwidth of waveguide. mode control technique cavities r...

High radio-frequency (rf) losses measured for cavities in original Continuous Electron Beam Accelerator Facility (CEBAF) cryomodules, compared to the single-cavity tests, have been a long-standing issue related their performance. We summarize experimental evidence of increased rf CEBAF arising from fundamental power coupler cold window and waveguide, respectively. Cryogenic tests were done on t...

Image of a waveguide superlattice under a high-resolution electron microscope, artificially colored to show the optical field confined in one waveguide. Electrical engineers at Rutgers University have created a method of integrating denser elements on optical chips. This technology may one day be used to make computer chips and data centers run faster and more cost-effective. As silicon integra...

RF undulators, suggested long time ago, has the advantage of fast dynamic control of polarization, undulator strength and wavelength. However, RF undulators require very strong RF fields in order to produce radiation of the same order as conventional static devices. Very high power RF energy confined inside a waveguide or a cavity can provide the necessary RF fields to undulate the electron bea...

in this article, the effect of cells' radius on the behavior of wavelength switching optical filter andthe effect of the radius of the optical filters' key characteristics such as wavelength resonance onan optical filter based on photonic crystals, have been investigated. currently, the most commonapplied mechanism for designing optical filter based on photonic crystals is using twome...

The Stanford two-mile linear accelerator uses 240 single-input-port, four output-port, S-band, rectangular-waveguide networks to feed rf energy sixty to seventy feet from the klystrons above ground to ten-foot-long, disc-loaded circular-waveguide, accelerator sections below ground. During installation it is necessary to permanently adjust the phase lengths of the four network branches to be wit...

The ability to controllably slow down the propagation of light pulses can enable a variety of important applications. In recent years, two different approaches have been pursued for slow light. One approach explores dispersion engineering with passive optical elements such as resonators, filters, and photonic bandgap structures. The other approach takes advantage of coherent nonlinear optical p...