Abstract

The ion specie fractions of the diagnostic hydrogen beam of TEXTOR tokamak have been determined by making use of a Hα-light Doppler shift spectroscopy and alternatively by a magnetic mass spectrometer. The measurements were done for the fixed beam energy of 50 keV and beam current variable up to 2.5 A. According to the measurements, the full energy beam component is for a radio frequency plasma box ∼50% by the particle density and more than 75% for an arc-discharge plasma box.

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