Author: John E. RicePublisher:
ISBN:
Category :
Languages : en
Pages : 28
Book Description
X-ray Observations of Helium-like Scandium from the Alcator C-Mod Tokamak
X-ray Observations Between 10 and 150 KeV from the Alcator C Tokamak
Author: John E. RiceINIS Atomindex
Author: Helium Charge Exchange Recombination Spectoscopy on Alcator C-Mod Tokamak
Author: Kenneth Teh-Yong LiaoPublisher:
ISBN:
Category :
Languages : en
Pages : 704
Book Description
The Wide-View Charge Exchange Recombination Spectroscopy (CXRS) diagnostic at Alcator C-Mod, originally designed for measurement of boron, has been modified to fit several different roles. By measuring the He1+ (n = 4 [rightwards arrow] 3) emission line at 4686Å and surrounding spectra, we can measure 4He and 3He density, temperature, and velocity profiles and use this information to study turbulent impurity transport. The transport is characterized using a standard ansatz for the radial particle flux: [mathematical equation]. This effort is designated He CXRS. Also, direct measurement of 3He are used to test models of Ion Cyclotron Resonance Heating (ICRH). We look for evidence of fast ion production and the effect of the minority ion profile on fast wave heating. Several modifications were made to the hardware. Light is collected via two optical arrays: poloidal and toroidal. The toroidal array has been upgraded to increase throughput and spatial resolution, increasing the number of toroidal channels from 10 to 22. A new protective shroud was installed on the poloidal array. Additional diagnostics (a 11 channel beam duct view, neutralizer view, duct pressure monitor) were added to the Diagnostic Neutral Beam to improve DNB modeling for CXRS. This work includes investigation of plasmas where helium is at low concentration (1%), acting passively, as well as scenarios with a large fraction (~20%). Using the STRAHL code, time-dependent helium density profiles are used to obtain anomalous transport parameters. Thermodiffusion and curvature pinch terms are also estimated from experimental scaling studies. Results are compared with neoclassical results from the NCLASS code and calculations by the GENE gyrokinetic code. Another focus is verification of power deposition models which are crucially dependent on minority ion density, for which 3He is used. At low 3He fraction, direct absorption by 3He generates fast ions with anisotropic velocity-space distribution functions. At high 3He fraction, mode conversion heating of electrons is dominant. The minority distribution function and predicted wave deposition are simulated using AORSA and CQL3D. This work provides the first measurements of helium transport on C-Mod and expands our understanding of helium transport and fast wave heating.
Observation of H- and He-like X-ray Line Emission in High Density Tokamak Plasmas
Author: E. KällneFusion Science and Technology
Author: Collisional Transport in Magnetized Plasmas
Author: Per HelanderPublisher: Cambridge University Press
ISBN: 9780521020985
Category : Science
Languages : en
Pages : 316
Book Description
A graduate level text treating transport theory, an essential element of theoretical plasma physics.
Plasma Kinetics in Atmospheric Gases
Author: M. CapitelliPublisher: Springer Science & Business Media
ISBN: 3662041588
Category : Science
Languages : en
Pages : 302
Book Description
Emphasis is placed on the analysis of translational, rotational, vibrational and electronically excited state kinetics, coupled to the electron Boltzmann equation.
Extreme States of Matter
Author: Vladimir E. FortovPublisher: Springer
ISBN: 3319189530
Category : Science
Languages : en
Pages : 714
Book Description
With its many beautiful colour pictures, this book gives fascinating insights into the unusual forms and behaviour of matter under extremely high pressures and temperatures. These extreme states are generated, among other things, by strong shock, detonation and electric explosion waves, dense laser beams, electron and ion beams, hypersonic entry of spacecraft into dense atmospheres of planets and in many other situations characterized by extremely high pressures and temperatures. Written by one of the world's foremost experts on the topic, this book will inform and fascinate all scientists dealing with materials properties and physics and also serve as an excellent introduction to plasma-, shock-wave and high-energy-density physics for students and newcomers seeking an overview. This second edition is thoroughly revised and expanded, in particular with new material on high energy-density physics, nuclear explosions and other nuclear transformation processes.
Charged Particle Traps
Author: Fouad G. MajorPublisher: Springer Science & Business Media
ISBN: 3540265767
Category : Science
Languages : en
Pages : 347
Book Description
Over the last quarter of this century, revolutionary advances have been made both in kind and in precision in the application of particle traps to the study of thephysics of charged particles, leading to intensi?ed interest in, and wide proliferation of, this topic. This book is intended as a timely addition to the literature, providing a systematic uni?ed treatment of the subject, from the point of view of the application of these devices to fundamental atomic and particle physics. Thetechniqueofusingelectromagnetic?eldstocon?neandisolateatomic particles in vacuo, rather than by material walls of a container, was initially conceivedbyW.Paulintheformofa3Dversionoftheoriginalrfquadrupole mass ?lter, for which he shared the 1989 Nobel Prize in physics [1], whereas H.G. Dehmelt who also shared the 1989 Nobel Prize [2] saw these devices (including the Penning trap) as a way of isolating electrons and ions, for the purposes of high resolution spectroscopy. These two broad areas of appli- tion have developed more or less independently, each attaining a remarkable degree of sophistication and generating widespread interest and experimental activity.