Fast access to neutral injection heating profiles in W7AS
A fast code was developed to estimate the heating power profiles of the neutral injection system for diagnosed shots of W7AS. This code, named NIPOR, uses a number of data sets of the local power deposition of neutral beams and analytical fits of the total heating efficiency for each source. These data were obtained by previous runs of FAFNER1, a Monte Carlo code for simulating the NI heating on W7AS. The main input parameters needed for this estimation are the electron density n(e)(r), electron temperature T(e)(r), toroidal magnetic field B(0) and the identifiers of the active NI-sources at the corresponding time t(c). These data are routinely read from the ORACLE data set. To achieve high flexibility of the available FAFNER1 data, the heating profiles were not stored direct, but in the form of radially deposited heating power per source as a function of the normalised variable, defined as the line-integrated density from the plasma edge to the centre divided by the volume of the corresponding shell. The partition of the reconstructed heating profile p(heat)(r) to heating of the ions p(i)(r) and electrons p(e)(r) is then estimated by using the critical energy E(crit)(r) as a function of T(e)(r). The influence of neutral gas on the global heating efficiency at low density target plasmas via charge exchange losses is also included.
Bibliographic Reference: Report: IPP 4/265 EN (1993) 26 pp.
Availability: Available from Max-Planck-Institut für Plasmaphysik, 8046 Garching bei München (DE)
Record Number: 199410217 / Last updated on: 1994-11-28
Original language: en
Available languages: en