(DURIP 96) High Resolution Diagnostics for Plasma in High Power Microwave Sources PDF Download
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Languages : en
Pages : 0
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Book Description
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.
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Category :
Languages : en
Pages : 0
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Book Description
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: Granatstein
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
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Book Description
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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Category :
Languages : en
Pages : 6
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Book Description
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.
Author:
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ISBN:
Category :
Languages : en
Pages : 168
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Author: R.S. Williams
Publisher: Springer Science & Business Media
ISBN: 9401595763
Category : Technology & Engineering
Languages : en
Pages : 367
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Book Description
energy production, environmental management, transportation, communication, computation, and education. As the twenty-first century unfolds, nanotechnology's impact on the health, wealth, and security of the world's people is expected to be at least as significant as the combined influences in this century of antibiotics, the integrated circuit, and human-made polymers. Dr. Neal Lane, Advisor to the President for Science and Technology and former National Science Foundation (NSF) director, stated at a Congressional hearing in April 1998, "If I were asked for an area of science and engineering that will most likely produce the breakthroughs of tomorrow, I would point to nanoscale science and engineering. " Recognizing this potential, the White House Office of Science and Technology Policy (OSTP) and the Office of Management and Budget (OMB) have issued a joint memorandum to Federal agency heads that identifies nanotechnology as a research priority area for Federal investment in fiscal year 2001. This report charts "Nanotechnology Research Directions," as developed by the Interagency W orking Group on Nano Science, Engineering, and Technology (IWGN) of the National Science and Technology Council (NSTC). The report incorporates the views of leading experts from government, academia, and the private sector. It reflects the consensus reached at an IWGN-sponsored workshop held on January 27-29, 1999, and detailed in contributions submitted thereafter by members of the V. S. science and engineering community. (See Appendix A for a list of contributors.
Author:
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ISBN:
Category : Science
Languages : en
Pages : 650
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Book Description
Author: David M. Lubman
Publisher: Oxford University Press
ISBN: 0195363140
Category : Science
Languages : en
Pages : 560
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Book Description
Contributors to this volume focus on the fundamentals of the technique of analyzing material based on the atomic weight of the species, using the power and definition of lasers to enable measurement of smaller quantities and more finely localized particles. Each chapter deals with a particular application area and should be sufficient to form an entry point for the utilization of mass spectrometry by graduate students and researchers. The book provides the first full discussion of the new techniques of laser applications in the field.
Author: Selim Jochim
Publisher:
ISBN: 9783816766988
Category : Bose-Einstein-Kondensation
Languages : en
Pages : 177
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Book Description
Author: United States. Department of the Army
Publisher:
ISBN:
Category : Military research
Languages : en
Pages : 388
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Book Description
Author: Joseph Shiloh
Publisher: Springer
ISBN: 9781475786330
Category : Technology & Engineering
Languages : en
Pages : 458
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Book Description
In the tradition of the previous three conferences, the proceedings of the 4th Ultra-Wideband Short-Pulse Electromagnetics Conference explores topics including pulse generation and detection; broadband electronic systems; antennas - theory, design, experiments and systems; pulse propagation; scattering theory; signal processing; and buried targets - detection and identification.
