Observation and Modeling of the Ar^16+ K-shell X-ray Emission Produced by Charge Exchange on NSTX

Details Observation and Modeling of the Ar^16+ K-shell X-ray Emission Produced by Charge Exchange on NSTX Observation and Modeling of the Ar^16+ K-shell X-ray Emission Produced by Charge Exchange on NSTX

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aps..dppko1011b&link_type=abstract

American Physical Society, 45th Annual Meeting of the Division of Plasma Physics, October 27-31, 2003, Albuquerque, New Mexico,

Physics

Plasma Physics

Scientific paper

Charge exchange has become of great interest to x-ray astronomy and planetary science as a result of the discovery of x-ray emission from comets. Simulating this x-ray production mechanism has been a prime goal of laboratory astrophysics. Using a high-resolution crystal spectrometer, we have measured the charge exchanged induced K-shell x-ray emission from Ar^16+ following the interaction of Ar^17+ ions with H injected into the NSTX plasma by a 40 keV neutral beam. During the neutral beam injection, emission from electron-impact collisions ceases, and the line emission is solely due to charge exchange. To explain the emission, we have constructed a complete radiative cascade model of Ar^16+ that includes electron capture into levels as high as n=30 and about 60,000 radiative transitions. Capture cross sections were calculated for the relevant full, half, and third neutral beam energies. We find excellent agreement between the model and the NSTX spectra. We will present these findings as well as our predictions of the emission in other spectral bands (optical through EUV). This work was performed under the auspices of the U.S. DOE by UC-LLNL under contract W-7405-Eng-48, by UMR under contract DE-FG02-84ER53175, and by PPPL under contract DE-AC02-76CHO3073.

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