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Using the TRANSP code as a reference, the accuracy of predictions by the simpler and much faster PENCIL code has been checked in several JET plasma regimes. For sufficiently dense plasmas and far enough from large steps in the input power, global and local predictions by PENCIL and TRANSP are found to be in excellent agreement. PENCIL can thus be confidently used as a fast and inexpensive computational tool for most transport studies of NBI-heated plasmas in JET. However, PENCIL results should not be trusted in strongly transient conditions (such as the early phase of a high-power NBI heating pulse) and in very low density regimes (when losses via charge-exchange processes can be a significant fraction of the input power). In these situations, TRANSP has to be used to obtain reliable results. The sensitivity of PENCIL results to the uncertainties associated with the JET experimental data used as input is also discussed briefly. As a by-product of these comparisons, the uncertainties inherent in the simulation of D-D neutron yields in high-performance JET discharges, such as those used for the Preliminary Tritium Experiment were investigated.

Additional information

Authors: CORRIGAN G, JET Joint Undertaking, Abingdon, Oxon. (GB);MUIR D G, JET Joint Undertaking, Abingdon, Oxon. (GB);TIBONE F, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-R(91)14 EN (1992) 87 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199210495 / Last updated on: 1994-12-02
Original language: en
Available languages: en