Argon K{alpha} measurement on DIII{endash}D by Ross filters technique (abstract)

Journal Article · Fri Jan 01 04:00:00 EST 1999 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.1149482· OSTI ID:303238

Snider, R T; Bogatu, I N; Brooks, N H; Wade, M R ^[1]

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1. General Atomics, San Diego, California 92186-5608 (United States)

Techniques to reduce the heat flux to the divertor plates in tokamak power plants and the consequent erosion of, and subsequent damage to the divertor target plates include the injection of impurities such as argon, that can dissipate the energy (through radiative or collisional processes) before it reaches the target plates. An important issue with this type of scheme is poisoning of the plasma core by the impurities introduced in the divertor region. Subsequently, there is a desire to measure the profiles of the injected impurities in the core. X-ray Ross filters with an effective narrow band pass centered on the argon K{alpha} line at 3.2 keV, have been installed on two of the existing x-ray arrays on DIII{endash}D in order to help determine the argon concentration profiles. Emissivity profiles of the K{alpha} lines and the emissivity profiles for the argon enhanced continuum can be inferred from the inverted filtered x-ray brightness signals if T{sub e}, n{sub e}, and Ar{sup 18+} profiles are known. The MIST code is used to couple the filtered x-ray signals to the time dependent measurements of T{sub e} and n{sub e}. Further, the Ar{sup 16+} profiles measured by charge transfer spectroscopy, are used as a constraint on the MIST code runs to calculate Ar{sup 18+} profiles and unfold the argon emissivity profiles. A discussion of the Ross filters, the DIII{endash}D argon data, and the data analysis scheme for inferring argon emissivity profiles will be discussed. Estimates of the total argon concentration in the core determined from this technique in DIII{endash}D argon puff experiments will be presented. {copyright} {ital 1999 American Institute of Physics.}

• OSTI ID: 303238
• Report Number(s): CONF-980605--
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 1 Vol. 70; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ARGON
ARGON IONS
DIVERTORS
ELECTRON DENSITY
ELECTRON TEMPERATURE
FILTERS
HEAT FLUX
K SHELL
KEV RANGE 01-10
PLASMA DIAGNOSTICS
PLASMA IMPURITIES
THERMONUCLEAR POWER PLANTS
TOKAMAK DEVICES