First measurements of the ion energy distribution at the divertor strike point during DIII-D disruptions | Zendy

P.B. Parks | Zendy; N.H. Brooks | Zendy; W. P. West | Zendy; C.P.C. Wong | Zendy; R. Bastasz | Zendy; W.R. Wampler | Zendy; D.G. Whyte | Zendy

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First measurements of the ion energy distribution at the divertor strike point during DIII-D disruptions

Author(s) -

P.B. Parks,

N.H. Brooks,

W. P. West,

C.P.C. Wong,

R. Bastasz,

W.R. Wampler,

D.G. Whyte

Publication year - 1995

Publication title -

osti oai (u.s. department of energy office of scientific and technical information)

Language(s) - English

Resource type - Reports

DOI - 10.2172/459432

Subject(s) - divertor , ion , atomic physics , diii d , deuterium , argon , kinetic energy , plasma , charge exchange , recoil , materials science , nuclear physics , physics , tokamak , quantum mechanics

Plasma/wall interaction studies are being carried out using the Divertor Materials Exposure System (DiMES) on DIII-D. The objective of the experiment is to determine the kinetic energy and flux of deuterium ions reaching the divertor target during argon-induced radiative disruptions. The experiment utilizes a special slotted ion analyzer mounted over a Si sample to collect the fast charge-exchange (CX) deuterium neutrals emitted within the recycled cold neutral layer (CNL) which serves as a CX target for the incident ions. A theoretical interpretation of the experiment reveals a strong forward pitch-angle dependence in the approaching ion distribution function. The depth distribution of the trapped D in the Si sample was measured using low-energy direct recoil spectroscopy. Comparison with the TRIM code using monoenergetic ions indicated that the best fit to the data was obtained for an ion energy of 100 eV

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