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Spectroscopic method to directly measure electric field distribution in tokamak plasma edge
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1997
Year
EngineeringTokamak Plasma EdgeLaser-plasma InteractionLaser Plasma PhysicPlasma SciencePlasma PhysicsPlasma Edge PhysicsOptical DiagnosticsLaser Plasma PhysicsPlasma TheoryPlasma ConfinementInstrumentationPlasma DiagnosticsElectrical EngineeringElectric Field DistributionPhysicsApplied Plasma PhysicPulse ModeLaser-induced FluorescenceMedium Size TokamakSpectroscopyNatural SciencesPlasma ApplicationSpectroscopic Method
A supersonic helium beam source operated in pulse mode was constructed for direct measurement of electric field distribution in the tokamak plasma edge region with the aid of laser-induced fluorescence (LIF) technique. In this technique only the polarization has to be observed of a LIF resulting from a laser-excited forbidden transition due to the Stark effect and the electric quadrupole to determine the electric field strength. No calibration is needed of the absolute intensity of LIF and tunable laser used. The helium atom beam density was obtained (about 1020 He atoms cm−2 s−1) at a distance of 7 cm from the pulsed nozzle. A model-type experiment to make clear the influence of a magnetic field on the LIF is reported. Design study was also made to install the supersonic beam and spectroscopic measurement system on a medium size tokamak.