Soft β limiting phenomena have been observed in T-10 in ECRH heated
plasmas. Neoclassical tearing modes are supposed to be responsible for the β
limitation. MHD onset was observed at high βp values but low βN values.
The critical β has been found to be almost independent of the collisionality parameter
νe*. Sawtooth stabilization by ECCD does not result in an increase of critical
beta. A dependence of the critical β on the q(r) profile (modified by ECCD)
has been observed.
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