Abstract
A Taylor-relaxed plasma (j=kB with k a constant) under external magnetic helicity injection encounters resonances in spatial frequencies of its force-free eigenmodes. Such driven resonance underlies the physics of magnetic self-organization and determines the flux amplification in laboratory helicity injection applications. Here we show that for partially relaxed plasmas where the deviation from the fully relaxed Taylor state, for example, a flux-dependent k, is a function of the normalized flux {chi}/{chi}{sub a} with {chi}{sub a} the poloidal flux at the magnetic axis, a modified driven resonance persists even if k({chi}) has an order-unity variation across the flux surfaces.
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