Neutral particle diagnostics for ohmically and auxiliary heated tokamaks

Journal Article · Thu Apr 01 04:00:00 EST 1982 · J. Vac. Sci. Technol.; (United States)

DOI:https://doi.org/10.1116/1.571523· OSTI ID:5419559

Wagner, F

Protons and hydrogen atoms in a plasma undergo charge-exchange collisions which give rise to an energetic charge-exchange flux emerging from the plasma. The intensity and energy distribution of the charge-exchange flux is measured separately for hydrogen or deuterium. Besides discussing the basic principles and the experimental techniques, this report concentrates on plasma characteristics accessible to neutral particle diagnostics. From the energy distribution of the charge exchange flux, the ion energy distribution can be inferred. In the case of a thermal plasma the measurement of the ion temperature profile allows the analysis of the ion energy transport, and with auxiliary heating the ion heating efficiency can be estimated. From the absolute intensity of the charge-exchange flux the hydrogen atom density can be determined; strong toroidal variation, with sharp increases at limiter and gas input valve, is observed. The atom flux which leaves the plasma hits the wall and forms one branch of plasma wall interaction which can be investigated by measuring the backscattering of neutrals from the wall and by analyzing the wall sputtering due to charge-exchange atoms. Neutral particle diagnostics carried out in the divertor chamber of a divertor tokamak reveal strong plasma wall interaction at the neutralizer plate.

• Research Organization: Max-Planck-Institut fuer Plasmaphysik, EURATOM-Association, D--8046 Garching bei Muenchen, West Germany
• OSTI ID: 5419559
• Journal Information: J. Vac. Sci. Technol.; (United States), Journal Name: J. Vac. Sci. Technol.; (United States) Vol. 20:4; ISSN JVSTA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
BARYONS
CHARGE EXCHANGE
CLOSED PLASMA DEVICES
DEUTERIUM
ELEMENTARY PARTICLES
ELEMENTS
ENERGY SPECTRA
FERMIONS
HADRONS
HEATING
HYDROGEN
HYDROGEN ISOTOPES
INSTABILITY
ION TEMPERATURE
ISOTOPES
LIGHT NUCLEI
NEUTRAL BEAM SOURCES
NONMETALS
NUCLEI
NUCLEONS
ODD-ODD NUCLEI
PLASMA DIAGNOSTICS
PLASMA HEATING
PLASMA INSTABILITY
PROTONS
SPECTRA
STABLE ISOTOPES
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
USES