Abstract
The heat flux to the target plates qp is a crucial design parameter for fusion machines. It can be measured by infrared (IR) cameras viewing the target plates. The sheath heat transmission coefficient γ is defined by qp=γkTe jtarget relating qp to particle fluxes and temperature. Sheath theory predicts γ in the range of 5…8We show γ determined experimentally from a comparison of qp from IR with Te and jtarget measured by Langmuir probes for low to high recycling regimes in L-mode with carbon targets. While γ is in the expected range at low recycling, unphysically low values are observed at high recycling.We compare heat flux measured on carbon and tungsten as target material in reproducible discharges. From these data it could be concluded that there is no measurable difference in γ for the two materials.We finally discuss the influence of γ on simulation results.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
