Ring-averaged ion velocity distribution function probe for laboratory magnetized plasma experiment

摘要: Ring-averaged velocity distribution function of ions at a fixed guiding center position is fundamental quantity in the gyrokinetic plasma physics. We have developed diagnostic tool for ring averaged laboratory experiments, which named as ring-averaged ion probe (RIDFP). The RIDFP set collectors different velocities. It designed to be immersed magnetized plasmas and achieves momentum selection incoming by Larmor radii. To nullify influence sheath potential surrounding on orbits ions, electrostatic body automatically adjusted coincide with space target use an emissive voltage follower. successfully measured equilibrium plasma, was accordance Maxwellian having temperature 0.2 eV.