Three-dimensional Simulation of Gas Conductance Measurement Experiments on Alcator C-Mod
Authors: D.P. Stotler and B. LaBombard
Date of PPPL Report: June 2004
Presented at: the 15th Topical Conference on High-temperature Plasma Diagnostics, 19-22 April 2004, San Diego, CA; proceedings to be published in the Review of Scientific Instruments.
Three-dimensional Monte Carlo neutral transport simulations of gas flow through the Alcator C-Mod subdivertor yield conductances comparable to those found in dedicated experiments. All are significantly smaller than the conductance found with the previously used axisymmetric geometry. A benchmarking exercise of the code against known conductance values for gas flow through a simple pipe provides a physical basis for interpreting the comparison of the three-dimensional and experimental C-Mod conductances.