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Investigations of Electron Cyclotron Emission from a Tokamak Plasma

Investigations of Electron Cyclotron Emission from a Tokamak Plasma PDF Author: David John Campbell
Publisher:
ISBN:
Category : Electrons
Languages : en
Pages :

Book Description


Investigations of Electron Cyclotron Emission from a Tokamak Plasma

Investigations of Electron Cyclotron Emission from a Tokamak Plasma PDF Author: David John Campbell
Publisher:
ISBN:
Category : Electrons
Languages : en
Pages :

Book Description


Experimental Investigation on Electron Cyclotron Absorption at Down-shifted Frequency in the PLT Tokamak

Experimental Investigation on Electron Cyclotron Absorption at Down-shifted Frequency in the PLT Tokamak PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 16

Book Description


Second Harmonic Electron Cyclotron Emission Studies of Tokapole-II Plasmas

Second Harmonic Electron Cyclotron Emission Studies of Tokapole-II Plasmas PDF Author: Marc Alexander Sengstacke
Publisher:
ISBN:
Category : Electrons
Languages : en
Pages : 538

Book Description


A Study of Tearing Modes Via Electron Cyclotron Emission from Tokamak Plasmas

A Study of Tearing Modes Via Electron Cyclotron Emission from Tokamak Plasmas PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 79

Book Description
This thesis studies several tearing mode problems from both theoretical and experimental points of view. A major part of this thesis is to demonstrate that Electron Cyclotron Emission (ECE) is an excellent diagnostic for studying an MHD mode structure and its properties in a tokamak plasma. It is shown that an MHD mode can be detected from the electron temperature fluctuations measured by ECE. The amplitude and phase profiles of the fluctuations contain detailed information about the mode structure. The ECE fluctuation phase profile indicates the magnetic island deformation due to the combination of sheared flow and viscosity. A model is presented to relate qualitatively the observed phase gradient to the local magnetic field, flow velocity shear and viscosity in a 2D slab geometry, using an ideal Ohm's law and the plasma momentum equation including flow and viscosity. Numerical solution of the resultant Grad-Shafranov-like equation describing the deformed island shows that the experimentally observed value of the phase gradient can be obtained under realistic parameters for the shear in the flow velocity and viscosity. A new approach to the tearing mode stability boundary and saturation level is also presented.

Experimental Studies of Plasma Fluctuations Using Electron Cyclotron Emission on ATF (Advanced Toroidal Facility) and TEXT (Texas Experimental Tokamak).

Experimental Studies of Plasma Fluctuations Using Electron Cyclotron Emission on ATF (Advanced Toroidal Facility) and TEXT (Texas Experimental Tokamak). PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 6

Book Description
The great stumbling block in the quest for fusion power using magnetic confinement devices is anomalous transport. It is conjectured that turbulent plasma fluctuations may be responsible for the degraded energy confinement observed in experiments. There exists a clear need for more detailed experimental studies of plasma microturbulence. We have started a set of experiments to measure electron temperature and density fluctuations using electron cyclotron emission (ECE). The ECE systems will employ auto-correlation and cross-correlation techniques to measure radiation from the Advanced Toroidal Facility at Oak Ridge National Laboratory (ORNL) and also from the Texas Experimental Tokamak (TEXT) at the University of Texas. This set of experiments on a stellerator and a tokamak will allow a unique comparative study of the fluctuation physics in the two different magnetic configurations. This work is in support of the United States Department of Energy Tokamak Transport Initiative and involves a collaborative effort between Auburn University, Georgia Institute of Technology, the University of Texas at Austin and ORNL. 3 refs.

Investigation of magnetic activity and thermal transport using electron cyclotron emission from the Texas experimental tokamak

Investigation of magnetic activity and thermal transport using electron cyclotron emission from the Texas experimental tokamak PDF Author: Horacio Gasquet
Publisher:
ISBN:
Category : Tokamaks
Languages : en
Pages : 486

Book Description


Langmuir probe investigation of the effect of electron cyclotron resonance heating on the edge plasma of the Texas Experimental Tokamak

Langmuir probe investigation of the effect of electron cyclotron resonance heating on the edge plasma of the Texas Experimental Tokamak PDF Author: Mark Albert Meier
Publisher:
ISBN:
Category : Tokamaks
Languages : en
Pages : 218

Book Description


Electron Cyclotron Emission Imaging System for HL-2A Tokamak

Electron Cyclotron Emission Imaging System for HL-2A Tokamak PDF Author: Shao Che
Publisher:
ISBN: 9781303537936
Category :
Languages : en
Pages :

Book Description
Magnetic confinement thermonuclear fusion energy has long been considered a potential substitute for fossil fuels as the major long term energy source of global development. With its effective magnetic field configuration, tokamak devices have received extensive investigations with advancement in plasma diagnostic tools [1]. A comprehensive millimeter wave passive imaging diagnostic system for measurement of electron temperature fluctuations in tokamaks has been conceived and developed at the University of California at Davis utilizing the Electron Cyclotron Emission from the plasma [2,3]. HL-2A is a diverted tokamak developed and constructed by the Southwestern Institute of Physics (SWIP) in Chengdu, China based on the vacuum vessel and magnetic coil system of the former German ASDEX device. Previous millimeter wave diagnostics including reflectometry and ECE radiometry have been installed on the tokamak for electron density and temperature profile measurements [4,5]. However, there is increasing need for fluctuation measurements over the plasma volume for research into plasma confinement and instabilities. Through a collaborative effort between the Davis Millimeter Wave Research Center (DMRC) of the University of California at Davis and SWIP, a new 192 channel (24 vertical by 8 radial) Electron Cyclotron Emission Imaging system has been designed and constructed at UC Davis for a 2 dimensional coverage of the plasma temperature with high spatial resolution. A new imaging optical system with zooming capability is optimized for the available port window on HL-2A with a versatile coverage of the plasma volume ranging from a magnification ratio of 1 to 1.8. A novel local oscillator (LO) optical system is designed to maintain the optimum illumination onto the antenna array under different operating frequencies of the Backward Wave Oscillator. The RF electronics for double down-conversion heterodyne frequency mixing and signal detection is developed from the DIIID ECEI system with improved sensitivity and reduced noise. Other millimeter wave components such as the dual-dipole antenna array and dichroic plate high-pass filters are fabricated and characterized. The complete system is assembled and calibrated in the laboratory at UC Davis with extensive testing and characterization of the functionality of each subsystem.

Cyclotron Emission During Electron Heating by Landau Wave Damping of Slow Modes in Tokamak Palsmas

Cyclotron Emission During Electron Heating by Landau Wave Damping of Slow Modes in Tokamak Palsmas PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

Book Description
The emission of cyclotron radiation from PLT plasma in the presence of a mildly superthermal tail in the electron velocity distribution is investigated. The emitted spectrum has asymmetries which can be used to investigate the tail formation during slow modes electron Landau damping.

Two Dimensional Electron Cyclotron Emission Imaging Study of Electron Temperature Profiles and Fluctuations in Tokamak Plasmas

Two Dimensional Electron Cyclotron Emission Imaging Study of Electron Temperature Profiles and Fluctuations in Tokamak Plasmas PDF Author: Bihe Deng
Publisher:
ISBN:
Category :
Languages : en
Pages : 542

Book Description