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Title: Impurity levels and power loading in the PDX tokamak with high power neutral beam injection

The PDX tokamak provides an experimental facility for the direct comparison of various impurity control techniques under reactor-like conditions. Four neutral beam lines can inject up to 6 MW for 300 ms. Carbon rail limiter discharges have been used to test the effectiveness of perpendicular injection, but non-disruptive full power operation for > 100 ms is difficult without extensive conditioning. Initial tests of a toroidal bumper limiter indicate reduced power loading and roughly similar impurity levels compared to the carbon rail limiter discharges. Poloidal divertor discharges with up to 5 MW of injected power are cleaner than similar circular discharges, and the power is deposited in a remote divertor chamber. High density divertor operation indicates a reduction of impurity flow velocity in the divertor and enhanced recycling in the divertor region during neutral injection.
Authors:
; ;
Publication Date:
OSTI Identifier:
6778902
Report Number(s):
PPPL-1932
ON: DE83001394
DOE Contract Number:
AC02-76CH03073
Resource Type:
Technical Report
Research Org:
Princeton Univ., NJ (USA). Plasma Physics Lab.
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; LIMITERS; PDX DEVICES; IMPURITIES; CARBON; GRAPHITE; NEUTRAL ATOM BEAM INJECTION; POLOIDAL DIVERTORS; BEAM INJECTION; DIVERTORS; ELEMENTAL MINERALS; ELEMENTS; MINERALS; NONMETALS 700209* -- Fusion Power Plant Technology-- Component Development & Materials Testing