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VA: Fachverband Vakuumphysik und Vakuumtechnik

VA 1: ITER - The new international fusion reactor

VA 1.4: Talk

Monday, March 23, 2009, 11:50–12:10, HSZ 101

ProVac3D and Application to the Neutral Beam Injection System of ITER — •Xueli Luo, Christian Day, and Matthias Dremel — Institut für Technische Physik, Forschungszentrum Karlsruhe GmbH, Postfach 3640, 76021 Karlsruhe

We have developed ProVac3D (3D density Profiles in Vacuum systems), a Monte Carlo simulation code, to calculate gas dynamics and the density profiles in a complex vacuum system characterized by distributed gas sources and pumps. The Neutral Beam Injection System of ITER is a good example of such a system, for which Forschungszentrum Karlsruhe is responsible to design the state-of-the-art cryogenic pump. By using ProVac3D, we can intensively study volumes of interest inside NBI and get the information about the pumping speed in order to provide the required density profile along the beamline. The advantage of ProVac3D is that it is flexible with modular structures and very fast to achieve precise statistics by large simulation numbers even with a current desktop computer. To extend ProVac3D beyond the free molecular regime, the collision of the probe molecule with the gas background has been included. We are going to present some preliminary results as well.