CHARACTERISTICS OF HOT IONS WITH A STRONG RF HEATING IN THE GAMMA 10 TANDEM MIRROR

摘要

Radio frequency waves in the ion cyclotron range of frequency (ICRF) are mainly used forrnthe plasma production and heating in the central cell of the GAMMA 10 tandem mirror. ThernGAMMA 10 has minimum-B anchor cells with a non-axisymmetric magnetic field configuration.rnThe ICRF heating system in the central cell has been improved to create a more axisymmetricrnplasma. A high ion temperature is attained with the system and high energy ions more than 50rnkeV are detected in both parallel and perpendicular directions to the magnetic field line. Strongrntemperature anisotropy is observed and strong Alfvén ion cyclotron (AIC) modes are excited duernto the anisotropy. With the AIC modes, high energy ions detected at the end increase and highrnenergy ions with nearly 90 degrees pitch angle in the central cell decrease.