The current penetration phase of PDX discharges is examined. The Fast-Ion Diagnostic Experiment has been used to measure the temporal evolution of the central q (r/a < 0.4) and to show the effect of magnetic perturbations on fast ions. During plasma current penetration, a series of magnetic perturbations was observed in the plasma. When the plasma current was rising rapidly, the perturbations were accompanied by increases in β + ℓi/2 and decreases in the loop voltage, suggesting a rapid penetration of the plasma current. When the plasma current was rising slowly, a series of 'minor' disruptions occurred. These were accompanied by decreases in β + ℓi/2 and in the loop voltage, and increases in the plasma current. During this phase, current penetration may be enhanced by the change in the resistivity profile which accompanies the disruption.
PDX放電における電流浸透位相を調査した。高速イオン診断実験を用いて、中心q値（r/a < 0.4）の時間発展を測定し、磁場擾乱が高速イオンに及ぼす影響を示した。電流浸透中に、一連の磁場擾乱がプラズマ中で観測された。プラズマ電流が急速に上昇しているとき、擾乱はβ + ℓi/2の増加とループ電圧の減少を伴い、プラズマ電流の急速な浸透を示唆した。プラズマ電流がゆっくりと上昇しているとき、一連の「マイナー」ディスラプションが発生した。これらはβ + ℓi/2の減少とループ電圧の減少、およびプラズマ電流の増加を伴った。この位相中、電流浸透はディスラプションに伴う抵抗率分布の変化によって促進される可能性がある。