Amplification of toroidal flux in compressed stabilized z-pinches in HBTX-1 (R = 100 cm, a = 6 cm) has been observed during MHD instabilities. The increase in flux leading to reversal of longitudinal magnetic field in the outside region when the toroidal flux is conserved is attributed to the large-amplitude stage of an m = 1 helical kink instability which redistributes the magnetic field. The measured values of wavelength, amplitude and growth rate in the early stages of the m = 1 instability observed during self-reversal are predicted with linear MHD stability computations which include dissipative effects. The observed radial expansion of the plasma is interpreted as a non-linear effect associated with the large-amplitude stage of the instability. After the process of self-reversal an approximately constant value of the pinch ratio (defined as the ratio of the average value of Bθ at the wall to Bz, averaged over the plasma) is obtained, which is independent of the initial parameters of the pinch.
圧縮された安定化zピンチにおけるトロイダル磁束の増幅が、HBTX-1（R = 100 cm, a = 6 cm）においてMHD不安定性の間に観測された。トロイダル磁束が保存される際に外部領域での縦磁場の反転をもたらす磁束の増加は、磁場を再分布させるm = 1のヘリカルキンク不安定性の大振幅段階に帰せられる。自己反転中に観測されたm = 1不安定性の初期段階における波長、振幅、成長率の測定値は、散逸効果を含む線形MHD安定性計算によって予測される。観測されたプラズマの径方向膨張は、不安定性の大振幅段階に関連する非線形効果として解釈される。自己反転の過程の後、ピンチ比（プラズマ全体で平均したBθの平均値とBzの比として定義される）のほぼ一定の値が得られ、これはピンチの初期パラメータに依存しない。