Far infrared fusion plasma diagnostics

Technical Report · Mon Jan 01 04:00:00 EST 1990

DOI:https://doi.org/10.2172/7011189· OSTI ID:7011189

Luhmann, Jr, N C; Peebles, W A

Over the last several years, reflectometry has grown in importance as a diagnostic for both steady-state density Profiles as well as for the investigation of density fluctuations and turbulence. As a diagnostic for density profile measurement, it is generally believed to be well understood in the tokamak environment. However, its use as a fluctuation diagnostic is hampered by a lack of quantitative experimental understanding of its wavenumber sensitivity and spatial resolution. Several researchers, have theoretically investigated these questions. However, prior to the UCLA laboratory investigation, no group has experimentally investigated these questions. Because of the reflectometer's importance to the world effort in understanding plasma turbulence and transport, UCLA has, over the last year, made its primary Task IIIA effort the resolution of these questions. UCLA has taken the lead in a quantitative experimental understanding of reflectometer data as applied to the measurement of density fluctuations. In addition to this, work has proceeded on the design, construction, and installation of a reflectometer system on UCLA's CCT tokamak. This effort will allow a comparison between the improved confinement regimes (H-mode) observed on both the DIII-D and CCT machines with the goal of achieving a physics understanding of the phenomena. Preliminary investigation of a new diagnostic technique to measure density profiles as a function of time has been initiated at UCLA. The technique promises to be a valuable addition to the range of available plasma diagnostics. Work on advanced holographic reflectometry technique as applied to fluctuation diagnostics has awaited a better understanding of the reflectometer signal itself as discussed above. Efforts to ensure the transfer of the diagnostic developments have continued with particular attention devoted to the preliminary design of a multichannel FIR interferometer for MST.

• Research Organization: California Univ., Los Angeles, CA (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG03-86ER53225
• OSTI ID: 7011189
• Report Number(s): DOE/ER/53225-T6; ON: DE93002531
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700320* -- Plasma Diagnostic Techniques & Instrumentation-- (1992-)
CLOSED PLASMA DEVICES
CONFINEMENT
DESIGN
DOCUMENT TYPES
ELECTROMAGNETIC RADIATION
FLUCTUATIONS
H-MODE PLASMA CONFINEMENT
INFRARED RADIATION
MEASURING INSTRUMENTS
PLASMA CONFINEMENT
PLASMA DENSITY
PLASMA DIAGNOSTICS
PROGRESS REPORT
RADIATIONS
REFLECTION
SCATTERING
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TURBULENCE
VARIATIONS