High Resolution Plasma Diagnostics for High Power Microwave (HPM) Generation Research PDF Download
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Languages : en
Pages : 0
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As proposed, we purchased the following three diagnostics systems: (1) Dual pulsed dye laser system, streak and framing camera and associated accessories. (2) Streak and framing camera and associated accessories. (3) Diagnostics and design of a long pulse (1 microsec) field emission electron gun with stable cross section for HPM sources.
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Languages : en
Pages : 0
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As proposed, we purchased the following three diagnostics systems: (1) Dual pulsed dye laser system, streak and framing camera and associated accessories. (2) Streak and framing camera and associated accessories. (3) Diagnostics and design of a long pulse (1 microsec) field emission electron gun with stable cross section for HPM sources.
Author: Edl Schamiloglu
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Languages : en
Pages : 9
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The purpose of the acquired instrumentation was to perform high spatial resolution and nanosecond time resolution plasma diagnostics in intense electron beam-driven high power microwave (HPM) sources to better understand the "pulse shortening" problem. We have thus performed the first laser interferometry measurement inside a high power backward wave oscillator (or any other intense beam-driven HPM source for that matter) during the course of microwave generation reported in the literature. Line-integrated electron densities between 9 x 10(exp 15) and 2 x 10(exp 16)/sq cm for microwave powers between 20 and 120 MW have been measured. The two main sources of the measured electron density are postulated to be: (1) plasma generated from the cutoff neck due to beam scrape off and, (2) material removed and ionized from the slow wave structure walls during microwave generation. A catastrophic microwave discharge results in termination of subsequent microwave generation. Novel modifications to the inlet of the slow wave structure in intense beam-driven backward wave oscillators are suggested as a result of this research.
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Languages : en
Pages : 0
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The gyrotron microwave source is driven by the Michigan Electron Long Beam Accelerator (MELBA) which operates at -0.8 MV, 1-10 kA, and 0.5-1.5 microsecond pulselength. The correlation was measured between optical spectroscopic emission versus microwave power and pulselength. It was found that the optical emission from hydrogen H-alpha radiation was correlated with microwave power and inversely related to microwave pulselength. The physical mechanism is related to plasma accreted from water vapor on the inside of the microwave cavity and collector. This water is ablated and dissociated to release hydrogen. (A continuing AFOSR/MURI program is exploring techniques to remove water from surfaces by RF plasma processing.) The microwave network analyzer was utilized to obtain cold tests of microwave structures in a rectangular-cross-section gyrotron and a coaxial gyrotron. The primary cold-cavity modes were measured and agreed very well with the results of heterodyned high power microwave signals analyzed by time-frequency analysis. Frequency chirping and mode hopping due to voltage fluctuations were observed as other possible causes of pulse shortening.
Author: Mark A. Heald
Publisher:
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Category : Science
Languages : en
Pages : 478
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Category : Aeronautics
Languages : en
Pages : 464
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Category : Power resources
Languages : en
Pages : 448
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Languages : en
Pages : 6
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Equipment required for the performance of research funded by DoD agencies was purchased and installed in the grantee's laboratories. This included a spectrograph, image intensifiers, CCD detectors, several oscilloscopes, pulse generator and other ancillary equipment. The proposed equipment list and the actual equipment purchased list with prices is presented and changes noted. This equipment has been used on the projects "Tri-University, Multidisciplinary, High Energy, Microwave Device Consortium" (AFOSR/DoD MURI), "Fundamental Limits to Compact, Expendable Pulsed Power and Microwave Source" (AFOSR New World Vistas), High Power Microwaves (AASERT), and AFOSR MURI Explosive-Driven Pulsed Power Generation.
![Plasma Diagnostics with Microwaves. [With Illustrations.]. PDF](https://books.google.com/books/content/images/frontcover/0I4N0AEACAAJ?fife=w80-h100)
Author: Mark Aikan HEALD (and WHARTON (C. B.))
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Languages : en
Pages : 0
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Category :
Languages : en
Pages : 9
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The primary objectives of this effort were to investigate gas breakdown, plasma antennas, and laser induced plasmas in the atmosphere. The contractor investigated the electrical breakdown of different types of gas under very fast transient voltage excitation. The research addresses different types of gas under different conditions of pressure, temperature, and electrical field stress as expressed on a Paschen curve. The contractor also investigated the feasibility of generating and shaping conducting plasma to be used as an antenna and generating a conducting path in the atmosphere using a high power laser.
Author: James Benford
Publisher: CRC Press
ISBN: 1420012061
Category : Science
Languages : en
Pages : 552
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Book Description
The first edition of High Power Microwaves was considered to be the defining book for this field. Not merely updated but completely revised and rewritten, the second edition continues this tradition. Written from a systems perspective, the book provides a unified, coherent presentation of the fundamentals in this rapidly changing field. The p
