Shine through measurements with hydrogen beam in JT-60

摘要

The shine-through rate with hydrogen beams in the JT-60 neutral beam injection experiments was measured in a beam energy range of 40-75 keV and plasma densities of (1-7) x 10(sup 19) m(sup -3) for the estimation of absorbed beam power in the plasma. The shine-through rate was calculated from the temperature rise measurement with thermocouples installed in an armor plate. The shine-through depends on the plasma density inverse-exponentially and the beam energy linearly. Additionally the rate changes with the plasma species and the plasma facing materials which effect impurity contamination of the plasma. An enhancement of beam stopping cross-section by multi-step collisions was also found even in a beam energy range of 40-75 keV. (author). (ERA citation 18:037831)