Neutral beam shine-through power and its dependence on the line density of the DIII-D plasma

Book · Sun Dec 31 04:00:00 EST 1995

OSTI ID:464911

Riggs, S; Hong, R; Kessler, D ^[1]

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1. General Atomics, San Diego, CA (United States)

Neutral beams are the primary source of auxiliary plasma heating in the DIII-D Tokamak. Part of the beam power passes through the plasma and is deposited on the wall of the tokamak (shine-through power) and does not contribute to plasma heating. It is therefore crucial to know the shine-through power in order to given an accurate account of the total power deposited in the plasma. The authors have recently remeasured the shine-through power using data taken from thermocouples embedded in the beam target tiles of the tokamak vessel. The tile temperature rise was correlated to the injected beam power. A dependence of the tile temperature rise on the initial tile temperature has been empirically measured and accounted for in order to obtain a more accurate determination of the shine-through beam power. Measurements of the shine-through beam power as a function of plasma density and beam energy confirm that shine-through power decreases exponentially with plasma density, and increases linearly with beam energy.

• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC03-89ER51114
• OSTI ID: 464911
• Report Number(s): CONF-950905--; ISBN 0-7803-2969-4
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAM INJECTION HEATING
DOUBLET-3 DEVICE
ENERGY ABSORPTION
ENERGY DEPENDENCE
EXPERIMENTAL DATA
NEUTRAL ATOM BEAM INJECTION
PLASMA DENSITY