A sufficiently high poloidal betaβ_θand low collisionallity, m=3/2 tearing modes are excited in the DⅢ-D tokamak by a q=1 sawtooth crash perturbation. The resulting islands of full radial width w are long lived and reduce global confinement(andβ_θ)by up to 30/100. These are tearing modes produced by the perturbed neoclassical bootstrap current destabilization of a seed island arising from the m=2/2 sawtooth precursor. The tearing modes are metastable. Even if the modes are conventionally stable, i.e. Δ'<0, for sufficiently highβ_θ, there is a range of island widths w above some threshold value over which the modified Rutherford equation predicts island growth.
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机译：在DⅢ-D托卡马克中，通过q = 1锯齿形碰撞扰动激发了足够高的倍体ββ_θ和低碰撞性，m / n = 3/2撕裂模式。所得到的全径向宽度为w的岛使用寿命长，并且可将整体约束（和β_θ）减小30/100。这些是由m / n = 2/2锯齿形前体引起的种子岛的扰动的新古典自举电流不稳定导致的撕裂模式。撕裂模式是亚稳态的。即使模式常规上是稳定的，即对于足够高的β_θ，Δ′＜0，在一定的阈值之上仍存在一定范围的岛宽w，在该阈值上修改的卢瑟福方程式预测了岛的增长。
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