[3L01-07] Fusion Instrument Engineering

[3L07] Development of a Calculation Method for Neutral Gas Pressure Distribution in Intermediate Flow

*Konan Yagasaki¹, Atsushi Okamoto¹, Takaaki Fujita¹, Minami Sugimoto¹, Shunya Higuchi¹, Muneo Koike¹, Yangyi Ma¹ (1. Nagoya Univ.)

Keywords:Intermediate flow, Neutral gas pressure, Divertor, Deatched plasma, DEMO reactor

An examination of exhaust route is one of the action plans of DEMO reactor, where the flow is considered to be intermediate flow due to relatively high pressure. Intermediate flow, which is flow regime between molecular and viscous flows, has conductance with non-linear pressure dependency which prevents us from applying linear solvers to the calculation of pressure distribution. In divertor-simulating experiment on linear plasma device NUMBER, it is also necessary to control neutral pressure in the intermediate flow to form detached plasma. We developed a new method of calculation and successfully calculated pressure distribution in NUMBER. In this presentation, we will explain and verify the method of calculation by comparing with actual measurement data.