Active beam probe spectroscopy, a proposal of measuring internal magnetic field distribution
- National Institute for Fusion Science, Nagoya (Japan)
For the study of magnetically confined plasmas, it is important to measure the q profile in tokamaks as well as the change of magnetic field configuration caused by the high beta effect in helical systems. The motional Stark effect has recently been utilized to find out the direction of local magnetic field by measuring the direction of polarization of spectral line emission from injected beam particles. The presented proposal is to improve the spatial resolution and the accuracy of this method by combining a technique of laser spectroscopy with it. A linearly polarized laser beam will be injected coaxilly with the neutral particle beam. Phase sensitive detection of induced fluorescence from the polarization-modulated laser light tuned to a split spectral line will be used to detect the local magnetic field direction, instead of observing the polarization of emissions due to electron impact excitation of injected atoms. An experimental scheme proposed and characteristics estimated will be described. 14 refs., 3 figs., 1 tab.
- OSTI ID:
- 67960
- Journal Information:
- Plasma Physics Reports, Vol. 20, Issue 2; Other Information: PBD: 1994; TN: Translated from Fizika Plazmy; 20: No. 2, 175-178(1994)
- Country of Publication:
- United States
- Language:
- English
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