Abstract
The unsaturated linear rise of the energy confinement time with density, En»e, up to the density limit is recovered in Ohmically heated discharges in ASDEX. Improvement of a factor of 2 is reached with E150 ms at n»e=5×1013 cm-3 The improved state is characterized by peaked density profiles. The ion heat diffusivity decreases to the neoclassical value. The parameter i=LneLTi governing the onset of ion-temperature-gradient modes, falls to the stability threshold. The improvement in confinement might therefore be attributed to the stabilization of i modes.
Original language | English |
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Pages (from-to) | 1105-1108 |
Number of pages | 4 |
Journal | Physical Review Letters |
Volume | 61 |
Issue number | 9 |
DOIs | |
State | Published - 1988 |
Externally published | Yes |