Phys. Rev. Lett. 63, 2060–2063 (1989)Magnetic field pitch-angle measurments in the PBX-M tokamak using the motional Stark effectReceived 23 February 1989; published in the issue dated 6 November 1989 Polarimetry measurements of the Doppler-shifted Hα emission from a neutral hydrogen beam on the PBX-M tokamak have been employed in a novel technique for obtaining q(r) and magnetic field pitch-angle profiles using the Stark effect. The resulting q(r) profile is very broad and its central value, q(0), is significantly below 1, which has important implications for theoretical models of sawteeth. © 1989 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.63.2060
DOI:
10.1103/PhysRevLett.63.2060
PACS:
52.70.Ds, 52.55.-s, 52.70.Kz
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