Measurements of neutral density profiles using a deuterium Balmer-alpha diagnostic in the C-2 FRC plasma

Journal Article · Mon Oct 15 00:00:00 EDT 2012 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4742141· OSTI ID:22093844

Gupta, Deepak K.; Deng, B. H.; Knapp, K.; Sun, X.; Thompson, M. C. ^[1]

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1. Tri Alpha Energy, Rancho Santa Margarita, California 92688 (United States)

In C-2 field-reversed configuration (FRC) device, low neutral density outside the FRC separatrix is required to minimize the charge exchange loss of fast particles. Titanium gettering is used in C-2 to reduce the wall recycling and keep the neutral density low in plasma edge. The measurements of neutral density radial profile are desirable to understand the plasma recycling and the effects of titanium gettering. These measurements are also needed to study the interaction of neutral beams with FRC plasma and confinement of fast ions. Diagnostic based on absolute deuterium Balmer-alpha (D-alpha) radiation measurements is developed and deployed on C-2 device to measure the radial profile of neutral density. Simultaneous measurements of electron density and temperature are done using CO{sub 2} interferometer, Thomson scattering, and triple probes diagnostics along with absolute D-alpha radiation. Abel inversion was performed to get the time dependent radial profile of the local D-alpha emission density. Neutral density profiles are obtained under different machine conditions of titanium deposition.

• OSTI ID: 22093844
• Journal Information: Review of Scientific Instruments, Vol. 83, Issue 10; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
BEAM-PLASMA SYSTEMS
BOUNDARY LAYERS
CARBON DIOXIDE
CHARGE EXCHANGE
DEUTERIUM
ELECTRON DENSITY
EMISSION
EQUIPMENT
FIELD-REVERSED THETA PINCH DEVICES
INTERACTIONS
INTERFEROMETERS
PLASMA
PLASMA CONFINEMENT
PLASMA DENSITY
PLASMA DIAGNOSTICS
REVERSED-FIELD PINCH DEVICES
REVERSE-FIELD PINCH
THOMSON SCATTERING
TIME DEPENDENCE
TITANIUM