Thomson scattering on the Texas Experimental Tokamak

Thesis/Dissertation · Tue Jan 01 00:00:00 EST 1985

OSTI ID:5223879

Porter, Jr, J L

A Thomson scattering diagnostic was constructed on the Texas Experimental Tokamak (TEXT) which is capable of measuring local electron temperatures in the range 10 eV less than or equal to T/sub e/ less than or equal to 2000 eV for densities greater than or equal to 5 x 10/sup 12/ cm/sup -3/. This diagnostic has been used to study the edge region of the plasma, the scaling of the central electron temperature and Z/sub effective/ over a wide range of discharge conditions, and the evolution of the electron temperature profile during the plasma formation and during a fast current ramp initiated well into the discharge. Current diffusion was modeled during the current rise portion of the standard TEXT discharge and during discharges in which the plasma current was rapidly increased after a steady-state discharge had been established by using the measured electron temperature profiles as input to a computer code which solves the one dimensional poloidal magnetic field diffusion equation. Because of the large differences found between the predicted and measured values of the loop voltage and the quantity ..beta../sub p/ + 1/sub i//2 during the initial current rise portion of the discharge it is concluded that the plasma current penetrates faster than can be explained by classical resistive current diffusion during this portion of the discharge.

• Research Organization: Texas Univ., Austin (USA)
• OSTI ID: 5223879
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
PLASMA DIAGNOSTICS
THOMSON SCATTERING
TEXT DEVICES
DIFFUSION
ELECTRIC CURRENTS
ELECTRIC DISCHARGES
ELECTRON TEMPERATURE
STEADY-STATE CONDITIONS
CLOSED PLASMA DEVICES
CURRENTS
INELASTIC SCATTERING
SCATTERING
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
700102* - Fusion Energy- Plasma Research- Diagnostics