English

Scalings and Plasma Profile Parameterisation of ASDEX High Density Ohmic Discharges

Plasma Physics 2018-03-29 v1

Abstract

High density (.3<nˉ/1020m3<.8.3 < \bar{n}/10^{20}{\rm m^{-3}} < .8), low qaq_a (1.9<qa<3.41.9<q_a<3.4), Ohmic discharges from the ASDEX experiment is analysed statistically. Bulk parameter scalings and parameterised temperature and density profile shapes are presented. The total plasma kinetic energy, assuming Ti=TeT_i=T_e, scales as nˉ .54±.01Ip.90±.04\bar{n}^{\ .54\pm .01} {I_p}^{.90\pm .04 } and is almost independent of BtB_t. The electron temperature profile peaking factor scales as T03/2/<T3/2>=.94(±.04)qa1.07±.04{T_0^{3/2}/<T^{3/2}>} = .94(\pm.04){q_a}^{1.07\pm.04} in close agreement with the assumption of classical resistive equilibrium. In the inner half of the plasma, the inverse fall-off length for both temperature and density has a strong dependence on qaq_a, with the temperature dependence being more pronounced. Outside the half radius, the qaq_a dependence disappears but the density profile broadens near the edge with increasing plasma current.

Keywords

Cite

@article{arxiv.1803.10398,
  title  = {Scalings and Plasma Profile Parameterisation of ASDEX High Density Ohmic Discharges},
  author = {P. J. Mc Carthy and K. S. Riedel and O. J. W. F. Kardaun and H. Murmann and K. Lackner},
  journal= {arXiv preprint arXiv:1803.10398},
  year   = {2018}
}