<RESEARCH REPORT>Determination of Pitch Angles of Magnetic Field Lines in Tokamak with Obliquely Injected Helium Beam
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Pitch angles of magnetic field lines or q-profile in high density tokamak can be determined by a new method proposed here. Blobs of monoenergetic helium beam with different velocities are injected into the tokamak obliquely to the toroidal direction on a poloidal plane x. Produced He^+ ions move nearly along magnetic field lines, and their front emitting a HeII line crosses a different sight plane and forms a curve on it. Optically measured shift of the curve from x leads to the distribution of pitch angle after correction of perpendicular drift motion of He^+ ions using the velocity dependence of the drift.
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