Particle Simulation of Linear Diffusion Pumps for DEMO Torus Exhaust Pumping.

• A simulation model for Mercury-driven Linear Diffusion Pumps (LDPs) is presented • The simulation model is based on the Direct Simulation Monte Carlo method • The sensitivity of the LDP with respect to several parameters is investigated • Potential optimization strategies are discussed It is currently foreseen to implement Mercury-driven Linear Diffusion Pumps (LDP) in the primary pumping system of the European demonstration fusion power plant (DEMO). Here, a simulation model using the Direct Simulation Monte Carlo (DSMC) method is presented and verified. By a series of simulations the sensitivity of a LDP is analyzed with respect to inlet pressure, compression ratio, gas species dependence, backstreaming and condensation as well as the impact of geometric parameters to explore the operational limits of a LDP. The simulation results confirm that DSMC is a useful tool for the simulation and optimization of LDPs in conditions relevant for fusion reactor exhaust pumping. [ABSTRACT FROM AUTHOR]