A beam probe spectroscopic technique for ion temperature and plasma rotation measurements

摘要

A compact and pulsed atomic‐hydrogen beam source was constructed for the advanced spectroscopic technique of ion‐temperature measurements. The mean energy and the equivalent current of the beam were ∼400 eV and ∼13 A/cm2. In this energy region, most of the charge‐transferred neutrals in a hydrogen plasma are in the ground state and they emit spectral lines through an electron impact excitation process. The behavior of the neutrals generated by beam probing was analyzed by a Monte‐Carlo simulation to study the relation between the temperatures of the plasma ions and the neutrals. The measured temperature of a plasma was 100 eV and its rotation energy 20 eV.