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Measurement of the magnetic field fluctuations by use of a gold neutral beam probe in the tandem mirror GAMMA 10

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10 Author(s)
Kojima, Atsushi ; Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai Tsukuba, Ibaraki 305-8577, Japan ; Ishii, K. ; Takemura, Y. ; Hagisawa, K.
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The beam deflection coefficients to the magnetic field fluctuation using a gold neutral beam probe was examined by numerical simulations. The beam deflection parallel to the magnetic field line was mainly caused by the azimuthal component of the magnetic field fluctuation in a case of the beam passing through the plasma center; on the other hand, the beam passing through the plasma edge was deflected by the radial component of the magnetic field fluctuation because the radial and azimuthal velocity components of the beam depend on the injection angle into the plasma. Then, the coefficients could be described as being the function of the injection angle which indicated the radial position of the ionization point and the measured point. As a result of numerical simulation, the coefficients were estimated to be 0.1 and 1.3 for the radial and the azimuthal components of the magnetic field fluctuation in the case of the beam passing through the plasma center. We also estimated the potential effects on the beam deflection parallel to the magnetic field line by the numerical simulation because the change of the beam energy caused the beam detected point to move. We found the potential effects to be smaller than the sensitivity of the magnetic field fluctuation.

Published in:

Review of Scientific Instruments  (Volume:75 ,  Issue: 10 )