Charge exchange recombination spectroscopy as a plasma diagnostic tool (invited)
Intensity and line profile measurements of the spectra of light hydrogenic ions which are excited by charge exchange reactions with fast neutral atoms are being widely used as diagnostics for fusion plasma research. This technique, which is referred to as charge exchange recombination spectroscopy, allows measurements of the densities of fully stripped impurity ions and particle transport coefficients with only minor uncertainties arising from atomic processes. The excitation of long-wavelength transitions in light ions such as He/sup +/, C/sup 5 +/, and O/sup 7 +/ allows relatively easy measurements of ion velocity distributions to determine ion temperatures and plasma rotation velocities. Among its advantages for such measurements are the facts that fiber-optic coupling between a remote spectrometer and the immediate reactor environment is possible in many cases, the measurement is localized by the intersection region of a neutral beamline and viewing sightline, and intrinsic ions can be used so that injection of potentially perturbing impurities can be avoided. A particularly challenging application of this technique lies in the diagnosis of alpha particles expected to be produced in the present generation of Qroughly-equal1 tokamak experiments.
- Research Organization:
- Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08544
- OSTI ID:
- 5761357
- Journal Information:
- Rev. Sci. Instrum.; (United States), Vol. 56:5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
PBX DEVICES
ALPHA PARTICLES
CHARGED-PARTICLE TRANSPORT
IMPURITIES
ION TEMPERATURE
PLASMA DIAGNOSTICS
PDX DEVICES
SPECTROSCOPY
CARBON IONS
CHARGE EXCHANGE
EXCITATION
FIBER OPTICS
HELIUM IONS
NEUTRAL ATOM BEAM INJECTION
OXYGEN IONS
RECOMBINATION
ROTATION
SPECTROMETERS
ULTRAVIOLET RADIATION
VELOCITY
BEAM INJECTION
CHARGED PARTICLES
CLOSED PLASMA DEVICES
ELECTROMAGNETIC RADIATION
ENERGY-LEVEL TRANSITIONS
IONS
MEASURING INSTRUMENTS
MOTION
RADIATION TRANSPORT
RADIATIONS
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
700102* - Fusion Energy- Plasma Research- Diagnostics