Time-resolved measurements of microwave emission bursts are presented. At a microwave frequency of 6. Electron cyclotron plasma instabilities are related to non-linear interaction between plasma waves and energetic electrons resulting to strong microwave emission and a burst of energetic electrons escaping the plasma, and explain the periodic oscillations of the extracted beam currents observed in several laboratories. Calculations of the nonlinear absorption, including the spread in N across the beam, have been done using approximate analytic absorption coefficients and with an orbit code. Source is able to produce gaseous multicharged ions as well as light ion beams like hydrogen or deuterium. The X-ray spectrum was measured, and the absolute spectral intensity of emission was determined in a 6—17 nm wavelength range.
Progress and Perspective for High Frequency, High Performance Superconducting Ion Sources. Meeker, Finite Element Method Magnetics, Version 4. It is shown that, owing to relativistic effects, strong instability of the oblique Z-mode is possible only in a limited energy range of the hot component. Part 3: Electron Cyclotron Resonance Ion Sources for Single or Low Charged Ions. The book is written by a well known recognized expert in the field, an inquisitive experimentalist with a solid theoretical background. The neutral gas pressure and incident microwave power was found to have the strongest influence on the ionization rate.
Types of gas discharges and different ionization processes are described. From United Kingdom to U. These measurements confirm the expected triangular shape of the extracted beam. In this article we present new measurements with an improved setup allowing for a faster pulsing of the biased disk voltage. Electron Cyclotron Resonance and Microwave Discharge Ion Sources have been designed at 2.
We also present data for the injection of neutral particles from laser ablated plasmas and Bremsstrahlung spectra for different dc biased disk voltages. Cyclotron masers elsewhere in the solar system and in laboratory plasma devices; Epilogue; Glossary of terms; List of acronyms; References; Index. Hydrogen electron cyclotron resonance ion sources plasma measurements based on simple optical emission spectroscopy on a new compact low current ion source designed and built by the authors is presented. Detailed hints are given in this book, suggesting the successive conversion of O- to X- and then to electron Bernstein waves, citing overdense heating ray-tracing calculations of a toroidal magnetic fusion plasma, proposed more than two decades ago. The free VitalSource Bookshelf® application allows you to access to your eBooks whenever and wherever you choose.
Nonstationary generation regimes, and modulation effects; 10. Thinking about the multidisciplinary interest this book should raise, let us take overdense discharges as an example. The second objective is to extend the simulations to take into account a smooth transition in density from the background plasma to the interior of the filament. Since the probability of multiple ionization increases with confinement time and better confinement is achieved by increasing the confining fields relative to the source minimum, a plasma and hence a beam with a distribution of more highly charged ions is more efficiently created in sources with higher confinement fields. In this work, historical review about different kinds of ion sources and their applications are reviewed and discussed. It covers elements of plasma physics, specific electron cyclotron resonance physics, and the technology directed at both scientists and engineers. .
Experimental observation of cyclotron instabilities in a minimum-B confined electron cyclotron resonance ion source plasma is reported. Principle of plasma generation and ion extraction are discussed and investigated. These results may help explain the unusual effects observed during heating of the Phaedrus tandem mirror device. May show signs of minor shelf wear and contain limited notes and highlighting. Robert Tribble has been nominated for and accepted for in the. © 2000 American Institute of Physics. Resonant heating results in the plasma with at least two electron components, one of which, more dense and cold, determines the dispersion properties of the high-frequency waves, and the second, a small group of energetic electrons with a highly anisotropic velocity distribution, is responsible for the excitation of unstable waves.
The source of that type is able to produce ion beams with highest current and quality, which allows to increase neutron flux yield from the target by 2 orders of magnitude compared to closest analogues. Part 1: General Aspects of Electron Cyclotron Resonance Plasmas. The spatial explosion and dilution of the electron density due to relativistic effects will be discussed. The availability of heavy ions with relatively large charge-to-mass ratios 0. The general parameters are a source of electrons, a small region of relatively high gas pressure, an electric field to accelerate the electrons in order to produce an intense gas discharge plasma with a relatively high electron and ions density and some mechanism for extracting a collimated parallel high current ion beam. The instabilities lead to loss of ion confinement, which results in the sputtering of the surfaces in contact with the plasma, followed by up to an order of magnitude increase of impurity currents in the extracted n+ ion beam. Che-Ming Ko has been named a.
In addition we performed single species experiments with the sextupoles energized. Wall- and particle-collisions can partially be added. Thinking about the multidisciplinary interest this book should raise, let us take overdense discharges as an example. This technique allowed to explore the fine structure in the spectrum of excited waves. The optimization of the microwave coupling to plasma has been carried out in order to improve the performances of such sources. From United Kingdom to U. A numerical analysis is made of the dependence of growth rates on hot and cold plasma parameters for waves propagating parallel and at small angles to B.
By observing the plasma luminescence both directly and through a low-cost transmission diffraction grating, basic characterization of the Hydrogen plasma obtainable in the ion source is carried out. The first objective is to validate the numerical simulations by comparing with the analytical results for the same plasma description—a step-function discontinuity in density. Measurement of radial and axial high energy x-ray spectra in electron cyclotron resonance ion source plasmas. Ion densities have been correlated to extracted currents. Brand new book, sourced directly from publisher. Our student has been featured in a video. Read the we received from the Department of Energy regarding the 50 years of beam at the Institute.