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Author : Robert Thomas Nachtrieb
Publisher :
ISBN 13 :
Total Pages : 304 pages
Book Rating : 4.:/5 (467 download)
Download or read book Ion Mass Spectrometry on the Alcator C-Mod Tokamak written by Robert Thomas Nachtrieb and published by . This book was released on 2000 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 117 pages
Book Rating : 4.:/5 (873 download)
Download or read book The Development of an Omegratron Plasma Ion Mass Spectrometer for Alcator C-Mod written by and published by . This book was released on 1993 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Edward E. Thomas (Jr.)
Publisher :
ISBN 13 :
Total Pages : 117 pages
Book Rating : 4.:/5 (284 download)
Download or read book The Development of an Omegatron Plasma Ion Mass Spectrometer for Alcator C-Mod written by Edward E. Thomas (Jr.) and published by . This book was released on 1993 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : James Lawrence Weaver
Publisher :
ISBN 13 :
Total Pages : 274 pages
Book Rating : 4.:/5 (434 download)
Download or read book Measurement and Analysis of Highly-resolved Spectra from Low-Z Ions in the Alcator C-mod Tokamak written by James Lawrence Weaver and published by . This book was released on 1999 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jon Christian Rost
Publisher :
ISBN 13 :
Total Pages : 154 pages
Book Rating : 4.:/5 (397 download)
Download or read book Fast Ion Tails During Radio Frequency Heating on the Alcator C-Mod Tokamak written by Jon Christian Rost and published by . This book was released on 1998 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Matthew Brian Sampsell
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (583 download)
Download or read book Beam Emission Spectroscopy on the Alcator C-Mod Tokamak written by Matthew Brian Sampsell and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Aaron Craig Bader
Publisher :
ISBN 13 :
Total Pages : 220 pages
Book Rating : 4.:/5 (824 download)
Download or read book Experimental Measurements and Numerical Modeling of Fast-ion Distributions in the Alcator C-Mod Tokamak written by Aaron Craig Bader and published by . This book was released on 2012 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis we discuss measurements and modeling of minority heated fast-ion distributions in the Ion Cyclotron Range of Frequencies (ICRF) on the Alcator C-Mod tokamak. Analysis of fast-ions >100Te is important for both ITER and a future fusion reactor as both will have a significant population of 3.5 MeV alpha particles generated in fusion reactions. Fast particles in this energy range can drive unstable modes such as Toroidal Alfvén Eigenmodes (TAEs) and Reversed Shear Alfvén Eigenmodes (RSAEs). Furthermore, energetic ions may display plasma properties that differ from the bulk plasma. It is crucial to benchmark current simulation codes with measurements from highly energetic fast-ions on current devices. This thesis will focus on measurements of the fast-ion distribution made on C-Mod with an upgraded Compact Neutral Particle Analyzer (CNPA). Measurements of the fast-ion distributions will reveal strong dependences of the fast-ion effective temperature on both electron density and plasma current. For further analysis, we use the simulated distributions generated by the coupled full-wave spectral solver AORSA, with the zero orbit-width bounce-averaged Fokker-Planck code CQL3D. A new synthetic diagnostic integrated into CQL3D is used to make direct comparisons with the CNPA. We find that for plasmas that have a steady-state fast-ion distribution (df /dt = 0) the simulation and the experiment have good agreement. However, in simulations where the fast-ion distribution is evolving in time (df/dt =/ 0) we find a discrepancy between the simulation and the experimental results. The simulation is seen to evolve much slower than the experiment. Various reasons for the discrepancy are explored, including the possibility of a violation of the quasi-linear theory used in CQL3D.
Author : Alexander Turner Graf
Publisher :
ISBN 13 :
Total Pages : 390 pages
Book Rating : 4.:/5 (81 download)
Download or read book Doppler Measurements in the Edge of the Alcator C-Mod Tokamak Using a High-resolution Visible Spectrometer written by Alexander Turner Graf and published by . This book was released on 2008 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Igor Olegovich Bespamyatnov
Publisher :
ISBN 13 :
Total Pages : 322 pages
Book Rating : 4.:/5 (26 download)
Download or read book Impurity Transport Studies on Alcator C-Mod Tokamak Using Charge Exchange Recombination Spectroscopy written by Igor Olegovich Bespamyatnov and published by . This book was released on 2008 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Charge-Exchange Recombination Spectroscopy (CXRS) diagnostic has been installed on Alcator C-Mod to study the transport of light impurities in plasma. The system provides spatially (1 cm) and temporally (12.5 msec) resolved measurements of the impurity density, temperature and flow velocities of the particular impurity. Two optical arrays: poloidal (19 channels) and toroidal (10 channels), collect the light emitted from excited impurity ion populated by charge exchange process from the Diagnostic Neutral Beam (DNB) particle. The attention of this dissertation is focused on the B4 (n = 7 [-->] 6) spectral line emitted by B4 ion formed in the following charge exchange reaction (H0 + B5+ [-->] H+ + B4+*). A complex spectral model was developed to simulate emission. The high magnetic fields of C-Mod result in broad Zeeman patterns which must be taken into account for the interpretation of the line shift and broadening in terms of impurity ion velocity and temperature. After the spectral line fitting and careful identification of the charge exchange component, the calculated Doppler broadening and shifts of the spectral line profile yield information on the ion temperature and rotation. Together with the calculation of the beam density, the absolute calibration of the CXRS optical system provides us with B5+ density measurement capabilities. One of the main objectives of this work was to use the acquired impurity density, temperature and flow velocity profiles to investigate plasma transport behavior and infer the radial electric field E[subscript R] from plasma force balance equation. The focus here was placed on the region of the Internal Transport Barrier (ITB) formation 0.35
Author : Paul Bonoli
Publisher :
ISBN 13 :
Total Pages : 42 pages
Book Rating : 4.:/5 (363 download)
Download or read book Electron Heating Via Mode Converted Ion Bernstein Waves in the Alcator C-mod Tokamak written by Paul Bonoli and published by . This book was released on 1996 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Christopher James Boswell
Publisher :
ISBN 13 :
Total Pages : 161 pages
Book Rating : 4.:/5 (53 download)
Download or read book Visible Spectroscopic Imaging on the Alcator C-Mod Tokamak written by Christopher James Boswell and published by . This book was released on 2003 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) 3) Two-dimensional emissivity profiles of visible continuum (420-430nm) have been measured and found to be an order of magnitude too large when compared to expected levels from electron-ion bremsstrahlung and radiative recombination. Several atomic and molecular processes have been considered to explain the enhanced continuum. However, none of the considered processes could explain the continuum level without particle densities inconsistent with current modeling efforts. The visible imaging system was also used in identifying the causes of impurity injections during discharges, in identifying the failure of invessel components, and as a monitor of vessel and plasma conditions. Both the physics results and the operational benefits of the visible imaging system show that the system is a valuable quantitative and qualitative diagnostic.
Author : Earl S. Marmar
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (351 download)
Download or read book Diagnostic Neutral Beam and Active Spectroscopy Requirements for the Alcator C-Mod Tokamak written by Earl S. Marmar and published by . This book was released on 1996 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Vincent Tang
Publisher :
ISBN 13 :
Total Pages : 187 pages
Book Rating : 4.:/5 (213 download)
Download or read book Experimental and Numerical Characterization of Ion-cyclotron Heated Protons on the Alcator C-Mod Tokamak written by Vincent Tang and published by . This book was released on 2006 with total page 187 pages. Available in PDF, EPUB and Kindle. Book excerpt: Energetic minority protons with -100 keV effective temperature are routinely created in Alcator C-Mod plasmas with the application of ICRF. A new multi-channel Compact Neutral Particle Analyzer is used to make measurements of these distributions in Alcator C-Mod's unique and reactor-relevant operating space via an active charge-exchange technique (CX). Using a detailed model that accounts for beam, halo, and impurity CX, core proton temperatures of 430-120 keV are directly measured for the first time in lower density (neo0 0.8 - 1.5 x 1020/m3) Alcator C-Mod plasmas using only 0.5 MW of ICRF power. The model found that the minority proton temperatures are peaked spatially away from r/a=O, even for an on-axis resonance. Additionally, noticeable phase-space anisotropy is seen as expected for ICRF heating. The measured effective temperatures scale approximately with the Stix parameter. The CNPA measurements are also compared with several leading simulation packages. Preliminary comparisons with results from the AORSA/CQL3D Full-wave/Fokker-Planck (FW/FP) code using a new synthetic diagnostic show good agreement and demonstrate that these complex codes are required to simulate Alcator C-Mod's energetic minority populations with accuracy. These FW/FP analyses represent the first comparison between predictions of such detailed codes and extensive minority ion experimental measurements.
Author : Kenneth Teh-Yong Liao
Publisher :
ISBN 13 :
Total Pages : 704 pages
Book Rating : 4.:/5 (882 download)
Download or read book Helium Charge Exchange Recombination Spectoscopy on Alcator C-Mod Tokamak written by Kenneth Teh-Yong Liao and published by . This book was released on 2014 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Author : Eric Alan Nelson-Melby
Publisher :
ISBN 13 :
Total Pages : 352 pages
Book Rating : 4.:/5 (54 download)
Download or read book Observations and Theory of a Mode-converted Ion Bernstein Waves in the Alcator C-Mod Tokamak written by Eric Alan Nelson-Melby and published by . This book was released on 2001 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) The PCI system in C-Mod measures line-integrated density fluctuations using a CO2 laser which passes vertically through the plasma. The density fluctuation pattern is an inherently 3-dimensional structure, so the full-wave code TORIC has been used to interpret the one-dimensional measurements, which have some unexpected features, such as multiple peaks and troughs in amplitude. Strong IBW signal was often observed to the low-field side of the mode conversion layer. The importance of the parallel electric field for these IBW density fluctuation measurements is identified. IBW wavenumbers from 5 to 12 cm-1 have been detected, which is within the range of the code results.
Author : Jeffrey M. Schachter
Publisher :
ISBN 13 :
Total Pages : 340 pages
Book Rating : 4.:/5 (38 download)
Download or read book Local Transport Analysis for the Alcator C-Mod Tokamak written by Jeffrey M. Schachter and published by . This book was released on 1997 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 994 pages
Book Rating : 4.:/5 (31 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 994 pages. Available in PDF, EPUB and Kindle. Book excerpt:
