Texas Experimental Tokamak
Texas Experimental Tokamak

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Publisher:

Published: 1994

Total Pages: 60

ISBN-13:

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The purpose is to operate and maintain TEXT Upgrade as a complete facility for applied tokamak physics in order to elucidate the mechanisms of working gas, impurity, and thermal transport in tokamaks and in particular to understand the role of turbulence. So that they can continue to study the physics that is most relevant to the fusion program, TEXT completed a significant device upgrade this year. The new capabilities of the device and new and innovative diagnostics were exploited in all main program areas including: (1) configuration studies; (2) electron cyclotron heating physics; (3) improved confinement modes; (4) edge physics/impurity studies; (5) central turbulence and transport; and (6) transient transport. Details of the progress in each of the research areas are described.

Impurity Levels and Power Loading in the PDX Tokamak with High Power Neutral Beam Injection
Impurity Levels and Power Loading in the PDX Tokamak with High Power Neutral Beam Injection

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Published: 1982

Total Pages:

ISBN-13:

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The PDX tokamak provides an experimental facility for the direct comparison of various impurity control techniques under reactor-like conditions. Four neutral beam lines can inject up to 6 MW for 300 ms. Carbon rail limiter discharges have been used to test the effectiveness of perpendicular injection, but non-disruptive full power operation for> 100 ms is difficult without extensive conditioning. Initial tests of a toroidal bumper limiter indicate reduced power loading and roughly similar impurity levels compared to the carbon rail limiter discharges. Poloidal divertor discharges with up to 5 MW of injected power are cleaner than similar circular discharges, and the power is deposited in a remote divertor chamber. High density divertor operation indicates a reduction of impurity flow velocity in the divertor and enhanced recycling in the divertor region during neutral injection.

Charge Exchange Measurements on the Texas Experimental Tokamak
Charge Exchange Measurements on the Texas Experimental Tokamak

Author: Kevin L. Empson

Publisher:

Published: 1988

Total Pages: 0

ISBN-13:

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Passive charge exchange measurements were made for a variety of tokamak discharge conditions. The central ion temperatures were determined, corrected for profile effects, and investigated for classical scaling behavior. The ion temperatures measured from the charge exchange spectrum were compared to those measured by impurity doppler broadening and to later charge exchange measurements obtained via diagnostic neutral beam injection. A mixed gas experiment using both hydrogen and deuterium was performed to determine the feasibility of resolving both ion species in the plasma center using the charge exchange diagnostic

Texas Experimental Tokamak
Texas Experimental Tokamak

Author:

Publisher:

Published: 1993

Total Pages: 89

ISBN-13:

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This progress report covers the period from November 1, 1990 to April 30, 1993. During that period, TEXT was operated as a circular tokamak with a material limiter. It was devoted to the study of basic plasma physics, in particular to study of fluctuations, turbulence, and transport. The purpose is to operate and maintain TEXT Upgrade as a complete facility for applied tokamak physics, specifically to conduct a research program under the following main headings: (1) to elucidate the mechanisms of working gas, impurity, and thermal transport in tokamaks, in particular to understand the role of turbulence; (2) to study physics of the edge plasma, in particular the turbulence; (3) to study the physics or resonant magnetic fields (ergodic magnetic divertors, intra island pumping); and (4) to study the physics of electron cyclotron heating (ECRH). Results of studies in each of these areas are reported.