An improved ohmic confinement has been achieved on HT-6M tokamak after
application of edge ohmic heating pulse which makes plasma current ra
pidly ramp up (0.4 ms) in a ramp rate of 12 MA/s. The improved ohmic c
onfinement phase is characterized by (a) energy and particle confineme
nt time increase, (b) non-symmetric increased density n(e), (c) reduce
d H(alpha) radiation, (d) increased T(e) and steeper T(e), n(e) profil
e at the edge. The results from soft x-ray sawteeth inversion radius a
nd beta(p) + l(i)/2 implied the anomalous current penetration.