نتایج جستجو برای: electron waveguide

تعداد نتایج: 324763  

Journal: :Physical review letters 2004
S V Samsonov A D R Phelps V L Bratman G Burt G G Denisov A W Cross K Ronald W He H Yin

A new method to generate ultrahigh-power microwave pulses compatible with mildly relativistic electron sources is proposed. This method involves a novel microwave compressor in the form of a metal helically corrugated waveguide, which can enhance the power of frequency-modulated nanosecond pulses up to the multigigawatt level. The results of the proof-of-principle experiments at kilowatt power ...

Journal: :Physical review letters 2008
T P Rowlands-Rees C Kamperidis S Kneip A J Gonsalves S P D Mangles J G Gallacher E Brunetti T Ibbotson C D Murphy P S Foster M J V Streeter F Budde P A Norreys D A Jaroszynski K Krushelnick Z Najmudin S M Hooker

The generation of quasimonoenergetic electron beams, with energies up to 200 MeV, by a laser-plasma accelerator driven in a hydrogen-filled capillary discharge waveguide is investigated. Injection and acceleration of electrons is found to depend sensitively on the delay between the onset of the discharge current and the arrival of the laser pulse. A comparison of spectroscopic and interferometr...

2001
M. Patrini M. Galli F. Marabelli M. Agio L. C. Andreani D. Peyrade Yong Chen

One– and two-dimensional photonic crystals are obtained by electron beam lithography and reactive ion etching on silicon-on-insulator waveguides. Variable-angle reflectance is measured and calculated in the 0.2–2-eV energy range, giving evidence of the quasi-guided modes of the photonic structure. Photonic bands in the one-dimensional case are determined and compare very well to those calculate...

2010
Kenneth Hammond

The TE-wave transmission technique is a method for measuring the electron cloud (EC) density in an accelerator beam pipe. It involves transmitting an RF signal through the pipe and detecting the intensity of the phase modulation caused by the fluctuating EC density. Using physical and simulated data, the experiments described in this paper explore the effects of reflections on the phase advance...

2015
Wing H. Ng Nina Podoliak Peter Horak Jiang Wu Huiyun Liu William J. Stewart Anthony J. Kenyon

We present the design and fabrication of a tunable optical buffer device based on III-V semiconductor platform for telecommunication applications. The device comprises two indium phosphide suspended parallel waveguides with cross sectional dimension of 200 nm by 300 nm, separated by an air gap. The gap between the waveguides was designed to be adjustable by electrostatic force. Our simulation e...

1998
Changbiao Wang J. L. Hirshfield A. K. Ganguly

The TE72 mode in cylindrical waveguide has its group velocity nearly equal to that of the TE11 mode when the operating frequency of the former is seven times of that of the latter. Thus the two modes have almost the same resonant magnetic field, and coherent radiation can be generated at the 7th harmonic when the fundamental energizes a gyrating electron beam by the cyclotron autoresonance inte...

Journal: :Physics of Plasmas 2023

We develop the theory of electron–wave interaction in gyrotrons with reflections part radiation, focusing on implementation self-modulation generation regimes controlled frequencies. The optimal conditions for simultaneous excitation neighboring axial modes electrodynamic system a gyrotron reflecting diaphragm output waveguide path are found. When is powered by an electron beam under these cond...

2008
C. D. Beard S. A. Griffiths C. Hill P. A. McIntosh A. Moss A. Wheelhouse C. White D. Teytelman

In this report the RF system design for EMMA (Electron Machine with Many Applications) is described. The power source options, power supplies, waveguide distribution scheme and control system is discussed. The architecture necessary to meet the operation specifications requires a large degree of adjustment and flexibility to accommodate machine commissioning requirements. To simplify commission...

2014
Chiping Chen

The interaction of multiple waveguide modes with a relativistic electron beam in an overmoded, single-frequency, cyclotron autoresonance maser amplifier is analyzed using a nonlinear self-consistent model and kinetic theory. It is shown analytically, and confirmed by simulation, that all of the coupled waveguide modes grow at the spatial growth rate of the dominant unstable mode, but suffer dif...

2014
Hongqiang Li Wenqian Zhou Yu Liu Xiaye Dong Cheng Zhang Changyun Miao Meiling Zhang Enbang Li Chunxiao Tang

An arrayed waveguide grating (AWG) demodulation integration microsystem is investigated in this study. The system consists of a C-band on-chip LED, a 2 × 2 silicon nanowire-based coupler, a fiber Bragg grating (FBG) array, a 1 × 8 AWG, and a photoelectric detector array. The coupler and AWG are made from silicon-on-insulator wafers using electron beam exposure and response-coupled plasma techno...

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