Download or read book Ion Cyclotron Resonance Heating Studies in the Central Cell of the Phaedrus Tandem Mirror written by Brian McVey and published by . This book was released on 1982 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Initial ICRF Heating Experiments in the TMX U Central Cell written by and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: An ion-cyclotron range of frequencies (ICRF) heating system has been installed in the Tandem Mirror Experiment-Upgrade (TMX-U) central cell. Our initial objective is to heat low density ions in the near field of the antenna. This heating reduces the collisionality of central cell ions, which decreases the filling rate of the thermal barrier by passing ions from the central cell. From power- and particle-balance calculations, we determined that 60 kW of absorbed power is sufficient to heat plasma densities of up to 2 x 1012 cm−3. These power requirements are consistent with ion heating results from the Phaedrus tandem mirror. Based on this, we have installed a 200-kW oscillator/power amplifier, tunable to as low as 1.5 MHz. It drives a 110°, 9 1/2-turn loop antenna that has a commercially built Faraday shield and matching network. The system has been tuned with plasma and is being used for the initial heating studies at the ion-cyclotron frequency .omega./sub ci.
Download or read book Use of ICRH for Startup and Initial Heating of the TMX U Central Cell written by and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Ion cyclotron resonance heating (ICRH) was evaluated and it was found to be satisfactory for use in establishing the conditions necessary to form a thermal barrier in TMX-upgrade (TMX-U). We discuss the constraints that must be satisfied in order to maintain a plasma, and outline a complete startup scenario that ends with the plasma at design parameters. The detailed discussions in this report concentrate on those parts of startup where ICRH is necessary. The ability of ICRH to couple power into a plasma at the fundamental ion cyclotron resonance, w/sub ci/, is determined from experiments with a half-turn loop antenna in the Phaedrus tandem mirror central cell. From these experiments, we get the empirical scaling that shows power deposited in the plasma is proportional to the plasma density.
Download or read book Fundamental Resonance Ion Cyclotron Heating in the Phaedrus Plug Mirrors written by Donald Keith Smith and published by . This book was released on 1980 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurements of Radial Profiles of Ion Cyclotron Resonance Heating on the Tandem Mirror Experiment upgrade written by Steven Falabella and published by . This book was released on 1988 with total page 342 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 1990 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of End Cell Ion Cyclotron Fluctuations on Central cell Ion Confinement in the Tandem Mirror Experiment TMX written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The tandem mirror device (TMX) exhibits gross stability to both MHD and microinstability modes. The end-cell plasmas provide the tandem with average minimum-B stability, while the efflux of plasma from the central cell maintains the end cells (plugs) at marginal stability to loss cone modes. For some operating conditions, a residual level of plug ion cyclotron fluctuations is detected. These oscillations dominate the fluctuation frequency spectra in both the plugs and the central cell. The presence of plug ion cyclotron fluctuations in the central cell leads to resonance heating of some of the central cell ions. This heating degrades the confinement of the central cell ions; thereby increasing the amount of warm plasma stream flowing through the plugs.
Download or read book Electron Cyclotron Resonance Heating in Tandem Mirrors written by Nguyen T. Lam and published by . This book was released on 1983 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mirror Confinement Systems Project Summaries written by United States. Department of Energy. Division of Mirror Confinement Systems and published by . This book was released on 1980 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurements of Radial Profiles of Ion Cyclotron Resonance Heating on the Tandem Mirror Experiment Upgrade written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A small Radial Energy Analyzer (REA) was used on the Tandem Mirror Experiment-Upgrade (TMX-U), at Lawerence Livermore National Laboratory, to investigate the radial profiles of ion temperature, density, and plasma potential during Ion Cyclotron Resonance Heating (ICRH). The probe has been inserted into the central-cell plasma at temperatures of 200 eV and densities of 3 x 1012cm/sup /minus 3// without damage to the probe, or major degradation of the plasma. This analyzer has indicated an increase in ion temperature from near 20 eV before ICRH to near 150 eV during ICRH, with about 60 kW of broadcast power. The REA measurements were cross-checked against other diagnostics on TMX-U and found to be consistent. The ion density measurement was compared to the line-density measured by microwave interferometry and found to agree within 10 to 20%. A radial intergral of n/sub i/T/sub i/ as measured by the REA shows good agreement with the diamagnetic loop measurement of plasma energy. The radial density profile is observed to broaden during the RF heating pulses, without inducing additional radial losses in the core plasma. The radial profile of plasma is seen to vary from axially peaked, to nearly flat as the plasma conditions carried over the series of experiments. To relate the increase in ion temperature to power absorbed by the plasma, a power balance as a function of radius was performed. The RF power absorbed is set equal to the sum of the losses during ICRH, minus those without ICRH. This method accounts for more than 70% of the broadcast power using a simple power balance model. The measured radial profile of the RF heating was compared to the calculations of two codes, ANTENA and GARFIELD, to test their effectiveness as predictors of power absorption profiles for TMX-U. 62 refs., 63 figs., 7 tabs.
Download or read book Power Deposition Calculations of Electron Cyclotron Resonance Heating for Tandem Mirror Transport Codes written by David Gustav Braun and published by . This book was released on 1983 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1985 with total page 740 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ion Acceleration in the Magnetosphere and Ionosphere written by Tom Chang and published by American Geophysical Union. This book was released on 1986 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: Papers and discussions presented at the Chapman Conference on Ion Acceleration in the Magnetosphere, Wellesley, Mass., 6/3-7/1985. Sponsored by the AGU and others.
Download or read book ERDA Energy Research Abstracts written by and published by . This book was released on 1983 with total page 1048 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electron Cyclotron Resonance Heating of Tandem Mirrors written by Miklos Porkolab and published by . This book was released on 1978 with total page 24 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 1979 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Electron Power Balance in the Tandem Power Phaedrus written by Larry Yujiri and published by . This book was released on 1982 with total page 656 pages. Available in PDF, EPUB and Kindle. Book excerpt:
