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Thursday, April 30, 2020 | History

3 edition of Simulation of cold-test parameters and RF output power for a coupled-cavity traveling-wave tube found in the catalog.

Simulation of cold-test parameters and RF output power for a coupled-cavity traveling-wave tube

Simulation of cold-test parameters and RF output power for a coupled-cavity traveling-wave tube

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  • 38 Currently reading

Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, D.C, Springfield, Va .
Written in English

    Subjects:
  • Computerized simulation.,
  • Cold flow tests.,
  • Radio frequencies.,
  • Cavities.,
  • Traveling wave tubes.,
  • Simulation.

  • Edition Notes

    Other titlesSimulation of cold test parameters and RF output power for a coupled cavity traveling wave tube.
    StatementJeffrey D. Wilson and Carol L. Kory.
    SeriesNASA-TM -- 111856., NASA technical memorandum -- 111856.
    ContributionsKory, Carol L., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15498376M

    Simulation Results of an Inductively-Coupled RF Plasma Torch in Two and Three Dimensions for Producing a Metal Matrix Composite for Nuclear Fuel Cladding. (December ) Eddie Frank (Trey) Holik III, B.S., Angelo State University Chair of Advisory Committee: Dr. Peter M. McIntyre. Radio-frequency capacitively coupled plasmas in hydrogen excited by tailored voltage waveforms: comparison of in-cell with Monte Carlo collisions (PIC-MCC) simulation predictions that, for a given peak-to-peak voltage (V pp), when RF power amplifier via a nF bias Size: KB. The purpose of the CRADA was to develop new microwave codes for analyzing both slow-,vave structures and beam-wave interactions of traveling wave tube amplifiers (TWTA), the microwave power source for satellite and radar communication systems. The scope of work also included testing and improving power modules through measurements and simulation. Electrotherapy Mechanism: creates muscle contraction by nerve or muscle stimulation - stimulates sensory nerve endings to transfer ions, and helps in relieving pain. this stimulation helps retard bacterial growth, increase local stimulation and tissue repair.


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Simulation of cold-test parameters and RF output power for a coupled-cavity traveling-wave tube Download PDF EPUB FB2

Simulation of cold-test parameters and RF output power for a coupled-cavity traveling-wave tube Abstract: Procedures have been developed which enable the accurate computation of the cold-test (absence of an electron beam) parameters and RF output power for the slow-wave circuits of coupled-cavity traveling-wave tubes (TWT's).Cited by: Get this from a library.

Simulation of cold-test parameters and RF output power for a coupled-cavity traveling-wave tube. [Jeffrey D Wilson; Carol L Kory; United States. National Aeronautics and. Jeffrey D.

Wilson, Carol. Kory, “Simulation of Cold-Test Parameter and RF Output Power for a Coupled-Cavity Traveling-Wave Tube”, IEEE Trans. Electron Devices, 42(11): – Google ScholarCited by: 2. Characterized with full-metal structure, high output power and broad bandwidth, microfabricated folded waveguide is considered as a robust slow-wave structure for millimeter wave traveling-wave tubes.

In this paper, cold-test (without considering the real electron beam) properties were studied and optimized by 3D simulation on slow-wave structure, for designing a  GHz Cited by: This demonstrates that the saturated RF output power of a coupled-cavity TWT can be accurately simulated using cold-test parameters determined with a three-dimensional electromagnetic simulation.

features optimizer and parameter sweep tools. In addition, procedures can be automated with Visual Basic for Applications (VBA) macros (ref.

In this report, the accuracy and efficiency of MWS for simulating cold-test parameters is established for a ferruled coupled-cavity traveling-wave tube File Size: KB. A W V-band coupled-cavity traveling-wave tube (CCTWT) is designed using High Frequency Structure Simulator (HFSS) and particle-in-cell (PIC) code in CST Particle Studio.

The RF section consists of a series of re-entrant cavities connected together with hollow metallic pipe called drift tube. In this region electron beam interacts with the input RF signal to be amplified.

Thus RF section design plays a vital role in deciding the tube performance parameters like gain,File Size: KB. Generalized three-dimensional simulation of ferruled coupled-cavity traveling-wave-tube dispersion and impedance characteristics Article (PDF Available) December with 58 Reads How we.

Keywords: Dispersion, Coupled-cavity slow-wave structures (CC-SWS), Traveling wave tube, Staggered structure, Coupling slots PACS No.: De 1 Introduction Coupled-cavity TWT is a high power microwave amplifier. Its peak output power varies from tens of kW to thousands of kW and average power goes up to few tens of : M K Alaria, Srivastava.

Simulation of cold‐test parameters and RF output power for a coupled‐cavity traveling‐wave tube Wilson, J.D.; Kory, C.L.

Backward‐wave oscillation suppression in high‐power broadband helix traveling‐wave tubes. The design and analysis of a high-power wideband sheet-beam coupled-cavity traveling-wave tube operating at V-band is presented. “Simulation of cold-test parameters.

and RF output power for. where Q L and Q ext are the loaded and external quality factors, is the angular driving frequency, 0 is the an- gular resonant cavity frequency, ts is the time interval between steps, P f is the forward power, and R/Q is the shunt impedance over the quality factor. In this analysis.

An equivalent-circuit representation of the coupled cavity traveling-wave paramietric amplifier is shown in Fig. 2e This particular circuit was chosen for analysis because it has been successfully applied in studying similar problems for traveling-wave-tube amplifiers.7 In.

DIGITIZED NONLINEAR BEAM AND WAVE INTERACTION THEORY OF TRAVELING WAVE TUBE AMPLIFIERS By W. Peng, Y. Hu, Z. Cao, and Z.-H. Yang. Full Article PDF ( KB) Abstract: To simulate the beam and wave interaction (BWI) of various types of traveling wave tube amplifiers (TWTAs), a digitized nonlinear theory has been developed with two features.

The design and analysis of a high-power wideband sheet-beam coupled-cavity traveling-wave tube operating at V-band is presented. The interaction circuit employs three-slot doubly periodic staggered-ladder coupled-cavity slow-wave structure, and a 5: 1 aspect-ratio sheet electron beam is used to interact with the circuit.

We describe a steady-state large-signal model of coupled-cavity traveling-wave tubes in which the input and output signals are periodic functions of time that may be represented by Fourier series of finite length.

The model includes both linear and nonlinear effects including circuit dispersion, reflections, intermodulation, and harmonic generation.

The model uses a lumped element Cited by: vortical dynamics in/around an RF-ICTP flow. Hence, this study is the first to reveal the coherent vortex structure and dynamic behaviour of the vortical plasma field in an RF-ICTP torch by a time-dependent 3D numerical simulation.

Model description Assumptions For an RF-ICTP generated under atmospheric pressure, the. Optimizing coupled-cavity traveling-wave tube (CCTWT) beam wave interaction (BWI) efficiency through tapering of the phase velocity could greatly increase RF output power. In order to do this work, a programme for CCTWT has been developed and implemented in BVERI.

The programme could do multidimensional large-signal calculation of CCTWT and optimize the lengths of the individual cavities. mination of the cavity configuration without any cold test- ing. The higher accuracy is needed in narrowband tubes, as well as in some MMW tubes of moderate bandwidth.

Most coupled-cavity TWT’s have a phase velocity taper toward the end of the output section to improve the efficiency and/or bandwidth of the device.

The taper is usually im. Simulation and Optimization of RF Cavities Introduction 3 Optimization Parameters 3 Description of Geometries Proposed 4 Optimization Parameters Obtained 7 References 8 2. Simulation and Optimization of Radio Frequency Quadrupole for.

Modeling Microwave Heating During Batch Processing of Liquid Sample in a Single Mode Cavity S. Curet1, F. Bellincanta Begnini, O. Rouaud1, L. Boillereaux1 1L’UNAM Université, ONIRIS, CNRS, GEPEA, UMR, Nantes, F, France @ @article{osti_, title = {Three-dimensional simulation of helix traveling-wave tube cold-test characteristics using MAFIA}, author = {Kory, C.L.}, abstractNote = {A critically important step in the traveling-wave tube (TWT) design process is the cold-testing of the slow-wave circuit for dispersion, beam interaction impedance and RF losses.

DESIGN, CONSTRUCTION AND EVALUATION OF A GHz, kW, CW COUPLED-CAVITY TRAVELING WAVE TUBE By: W. Ayers and Ward A. Harman Varian Associates Palo Alto, California SUMMARY A theoretical design for a high efficiency coupled-cavity traveling wave tube is described.

The objective was to obtain 4 kW, cw with 1% bandwidth at 2 GHz. Fig. 1, Fig. 2 show MATLAB simulations of the ALBA RF cavities with parameters shown in Table Download: Download high-res image (KB) Download: Download full-size image Fig.

ent cavity voltage with different coupling factors. Changing the coupling factor not only changes the steady-state cavity voltage, but also its time by: 8.

Here presented the electromagnetic properties and design methodology for W-band multi-section SWG traveling wave tube. Cold-test (in absence of electron beam) numerical design performed theoretically and further optimized/validated with standard simulation code to predict the dispersion, interaction impedance, ohmic-loss and small-signal : Anurag Srivastava.

The simulation results exhibited behaviors similar to the test results, such as the pressure regulators response to thruster firings.

Potential design solutions were investigated using the analytical model parameters, including increasing the volume downstream of the Format: Paperback. Kory, and J. Wilson, "Three-Dimensional Simulation of Coupled-Cavity Traveling-Wave Tube Cold­ Test Characteristics Using MAFIA," NASA TP, May 6.

Wilson, "Revised NASA Axially Symmetric Ring Model for PARAMETERS AT MID-BAND. scaled) on the RF test bench with no electron beam present.

The cold tests are used to determine the RF phase shift, inter-action impedance, and attenuation for a cavity. These data can then be used as input for a coupled-cavity TWT RF-beam-interaction computer model (ref.

4) which simulates the output RF power and beam characteristics. A coupled cavity consisting of a multi-gap structure is proposed as the circuit for an EIK device operating at low voltages.

The EIK’s characteristic is analyzed as a function of the voltage, input power and drift length. The maximum output power is up to 36 W with a Author: Kaichun Zhang, Ke Chen, Qian Xu, Wangju Xu, Neng Xiong, Xiaoxing Chen, Diwei Liu. The FW-SWS along with input/output couplers is assembled together with these two plates and brazed at the edges using silver based braze material.

After brazing, post machining at the edges of the input/output couplers is carried out to attach a WR waveguide to carry out the cold test measurement as shown in Fig. 3(c).Cited by: 2. Linda Lam, Associate, Transsolar, Inc., New York, NY Energy efficiency concerns are driving material selection decisions as designers and building developers.

RF output power of W, a very high intcraction efficiency of percent, and a 3-dB bandwidth of pcrcenl under pulsed operation. Because of an apparent vacuum Icak, S/N could not be operatcd under continuous wave (CW) con-ditions.

Thc second TWT (S/N ) was opcrational at CW, with a pcak saturated RF output power of W. An optimum working point is achieved with the maximum on-axis field of the pulsed solenoid set to T and the entrance of the RF cavity located at 12 cm. Fig. 5 shows the results of a HOMDYN simulation for the design beam accelerated on-crest.

The beam radius is damped to values below mm and the emittance can be reduced to values below 0 Cited by: 2. RF AMPLIFIER LOW NOISE OR LIMITING AMPLIFIER BASIC VCO-PLL •The mixer can be a simple double balanced mixer.

Devices such as a mini circuits ZFM are perfectly adequate. •The mixer IF output must go to DC. •Typically you are limited to somewhere between 7 and 13 dBm mixers by the output level of VCO.

Infrared Scene Generation, Projection, and Blending with Radio Frequency Energies for Hardware-In-The-Loop Simulation Testing [Paul H. Amundson] on *FREE* shipping on qualifying offers.

Infrared Scene Generation, Projection, and Blending with Radio Frequency Energies for Hardware-In-The-Loop Simulation Testing. A coupled cavity, solenoid focused, modulating anode controlled traveling-wave amplifier was designed and an experimental model was fabricated, tested, and delivered.

Three hundred () watts minimum and up to watts of CW power output was measured over a 2 GHz bandwidth at Ku-band. simulation, optimization, cold test methodology and performance data of a proposed radial extraction output cavity in which the microwave energy is extracted through an inner coaxial conductor in the TE01 circular mode.

The positioning of dielectrics in the drift spaces and the effect of axial and radial misalignments between the inner and.

25 Summary Designed 94 GHz overmoded coupled cavity TWT Simulated 32 dB of gain, W peak power Cold Tests of structures confirm TWT simulations, demonstrate successful manufacturing of cavities and show suppression of unwanted modes with AlN dielectric Electron gun beam test showed ±6 mA at of current at collector for 31 kV operation and agreed well with theory.

This article describes a broadband helix traveling wave tube which has been applied to the microwave power module. Its pulse output power can reach W, and works in C, X, Ku band.

This paper mainly studied the broadband slow-wave tube system. Travel through three-dimensional software simulation output power and efficiency of electronic wave tube.

Simulation of the Impedance Response of Thin Films As a Function of Film Conductivity and Thickness Y. Jin1, S. Kumar1, R.

A. Gerhardt1 1School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, USA Abstract 1. Introduction The electrical properties of materials are important in many different applications.View credits, reviews, tracks and shop for the CD release of Cold Waves + Minimal Electronics Volume One on Discogs/5(69).1) E-mail: [email protected] RF-thermal-structural-RF coupled analysis on the travelling wave disk-loaded accelerating structure PEI Shi-Lun(裴士伦)1) CHI Yun-Long(池云龙) ZHANG Jing-Ru(张敬如) HOU Mi(侯汨) LI Xiao-Ping(李小平) Institute of High Energy Physics, Chinese Academy of Sciences, BeijingChinaCited by: 3.