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首页> 外文期刊>Review of Scientific Instruments >Simultaneous measurement of q and E_r profiles using the motional Stark effect in high-performance DIII-D plasmas (invited)
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Simultaneous measurement of q and E_r profiles using the motional Stark effect in high-performance DIII-D plasmas (invited)

机译：Simultaneous measurement of q and E_r profiles using the motional Stark effect in high-performance DIII-D plasmas (invited)

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摘要

The motional Stark effect (MSE) diagnostic was developed to provide a measurement of the magnetic pitch angle or q profile in tokamaks. The technique relies upon polarization measurements of Stark broadened D_(#alpha#) emission to determine the pitch angle of the Lorentz v_b x B electric field, where v_b is the injected neutral beam particle velocity and B is the total magnetic field. However, in many advanced confinement regimes, large values of the plasma radial electric field, E_r, are observed and can affect the interpretation of MSE measurements. Viewing fixed locations in the plasma from two different viewing angles allows one the separate the E_r field from the v_b x B field, thus providing simultaneous measurement of the E_r and q profiles. To achieve this measurement, the DIII-D MSE diagnostic was recently upgraded from 16 to 35 channels with three independent viewing angles. The new instrument provides and E_r resolution of 5-10 kV/m with a time response of 1 ms. Measurement results from the VH mode, reverse shear, and H mode plasma are presented.

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