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Neutral Fueling Pressure Measurements And Modeling Near The Plasma Edge In Tmx U
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Book Synopsis Neutral-fueling Pressure Measurements and Modeling Near the Plasma Edge in TMX-U. Revision 1 by :
Download or read book Neutral-fueling Pressure Measurements and Modeling Near the Plasma Edge in TMX-U. Revision 1 written by and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Large variations in pressure from external gas-fueling sources and from plasma-induced wall reflux along the TMX-U plasma have been observed. These pressure variations can produce locally high neutral density in the plasma, which strongly affects the plasma parameters. These local pressure measurements include data from a newly installed neutral-pressure diagnostic system of fast magnetron gauges. The plasma-induced warm-wall reflux has been observed to be primarily HD and H2 as opposed to D2. This observation supports the model that all of the neutral D2 gas enters the plasma region, strikes the plasma first, and is dissociated. The part of the D2 gas, which is not absorbed as ions, strikes a wall, where it is converted to HD. Electron induced wall desorption measured by a mass spectroscopy and actual analysis of the Ti indicates predominately H2 instead of D2 wall loading in TMX-U.
Book Synopsis Neutral-fueling Pressure Measurements and Modeling Near the Plasma Edge in TMX-U. by :
Download or read book Neutral-fueling Pressure Measurements and Modeling Near the Plasma Edge in TMX-U. written by and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Large variations in pressure from external gas-fueling sources and from plasma-induced wall reflux along the TMX-U plasma have been observed. These pressure variations can produce locally high neutral density in the plasma, which strongly affects the plasma parameters. These local pressure measurements include data from a newly installed neutral-pressure diagnostic system of fast magnetron gauges. The plasma-induced warm-wall reflux has been observed to be primarily HD and H2 as opposed to D2. This observation supports the model that all of the neutral D2 gas enters the plasma region, strikes the plasma first, and is dissociated. The part of the D2 gas, which is not absorbed as ions, strikes a wall, where it is converted to HD. Electron induced wall desorption measured by a mass spectrograph and actual analysis of the Ti indicates predominately H2 instead of D2 wall loading in TMX-U.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1985 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fusion Energy Update written by and published by . This book was released on 1983 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ERDA Energy Research Abstracts written by and published by . This book was released on 1985 with total page 676 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1985 with total page 708 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.
Download or read book Physics Briefs written by and published by . This book was released on 1990 with total page 1048 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book INIS Atomindeks written by and published by . This book was released on 1987 with total page 1264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Neutral-particle Densities Outside the TMX-U Plasma Edge by :
Download or read book Neutral-particle Densities Outside the TMX-U Plasma Edge written by and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Neutral molecular densities just outside the plasma edge are measured at 11 axial locations in Tandem Mirror Experiment-Upgrade (TMX-U). These densities are time dependent and vary greatly with different modes of TMX-U plasma operation. The densities are low in the ion-cyclotron resonance heated central cell because of plasma pumping. The density is high in the plug near the sloshing-ion turning point. These densities are measured with a combination of new retractable, and fixed, magnetically unshielded Bayard-Alpert gauges that can be oriented to provide calibrated operation in the high (7-kG) MX-U magnetic fields. The role of the neutral density in simultaneously fueling and charge exchanging away the plug density is modeled using SMOKE, a Fokker-Planck code.
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1985-05 with total page 1116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1986 with total page 968 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1985 with total page 1148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis X-ray Imaging Studies of Electron Cyclotron Microwave-heated Plasmas in the Tandem Mirror Experiment-Upgrade by : Bruce Harlan Failor
Download or read book X-ray Imaging Studies of Electron Cyclotron Microwave-heated Plasmas in the Tandem Mirror Experiment-Upgrade written by Bruce Harlan Failor and published by . This book was released on 1986 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fast Pressure Measurements for the TMX-U Fusion Experiment by :
Download or read book Fast Pressure Measurements for the TMX-U Fusion Experiment written by and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The pressure on the boundary of the Lawrence Livermore National Laboratory's (LLNL) tandem mirror (TMX-U) plasma experiment is difficult to trace for several reasons: (1) the TMX-U boundary is in the high vacuum range (10−5 to 10−6 Pa) and requires an ionization gauge; (2) the boundary includes high-energy neutral particles and radiation, so the gauge must be optically baffled from the plasma; (3) the gauge must be shielded from the magnetic flux density of 0.03 T; (4) maximum conductance to the gauge must be preserved so that the time response remains about 1 ms; (5) a fast electrical circuit is required to measure the small ion-current changes at a rate consistent with the geometrical and experimental time constant of 1 ms. We have developed solutions to these limitations, including fast ionization gauge (FIG) circuitry for the remote gauge operation and the CAMAC system for recording the pressure-time history in the TMX-U computer data base. We also give some examples of actual fast pressure histories during plasma operation.
Download or read book Fusion Technology written by and published by . This book was released on 1985 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Annual Index: Keyword A-L by :
Download or read book Government Reports Annual Index: Keyword A-L written by and published by . This book was released on 1986 with total page 1164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Low Energy Neutral Source for Fueling the Central Cell Core Plasma of TMX-U. by :
Download or read book Low Energy Neutral Source for Fueling the Central Cell Core Plasma of TMX-U. written by and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The performance of a low energy neutral source formed by negatively biased plates inserted in the edge plasma of the central cell of the Tandem Mirror Experiment-Upgrade (TMX-U) is described. This technique promises to be capable of fueling the high density thermal barrier plasmas. We have found that annular ring electrodes mounted on the sides of the central cell gas box and inclined 45° to the plasma axis can produce about 80 A of inward-directed D° with an average energy E0 approx. = 250 eV (where the plate bias = -400 V). This example was calculated for a peak plasma density n/sub e/(0) = 1013 cm−3 and an edge plasma density n/sub L/ = 1012 cm−3 at the limiter edge defined by the biased plates. The energetic neutrals, attenuated by about an e-fold in reaching the plasma center, are thus much more efficient in fueling the core plasma than Frank-Condon atoms, which are attenuated by greater than a factor of 100. In addition, because their energy is greater than Frank-Condon atoms their initial collisional trapping rate in the thermal barrier is reduced by a factor of approximately (100)32 = 1000.
