| AVS 58th Annual International Symposium and Exhibition | |
| Vacuum Technology Division | Monday Sessions |
| Session VT-MoA |
| Session: | Optical and Mass Spectroscopy for Gas Analysis and Pump Modeling |
| Presenter: | Roberto Kersevan, ITER International Organization, France |
| Correspondent: | Click to Email |
The paper deals with the issue of the numerical computation of relevant properties of vacuum systems under ultra-high vacuum (UHV) conditions, i.e. when molecular flow conditions are in place. Properties of interest, among others, are pressure profile, angular profiles, conductances, transmission probabilities, effective pumping speed, sputtering deposition profiles.
Many modern research tools need UHV conditions in order to function properly. The size of the system is not an issue, it can be very small (electronic packaging; gauge calibration benches, for instance) or very large (ITER torus, cryostat and ancillary systems; particle accelerators; spectrometers, etc...). The availability of relatively cheap computing power has in recent years brought at the forefront of research new software tools which allow the simulation of complex geometries and working conditions.
The paper quickly reviews the existing algorithms and tools [1], and then moves on to show examples of calculations, with particular emphasis on the Molflow+ code [2].
[1] R. Kersevan, "Analytical & Numerical Tools for Vacuum Systems", Proc. CAS - CERN Accelerator School and ALBA Synchrotron Light Facility : Course on Vacuum in Accelerators, Platja d'Aro, Spain, 2006 - Downloadable at http://cdsweb.cern.ch/record/923393
[2] R. Kersevan, J-L. Pons, "Introduction to MOLFLOW+: New graphical processing unit-based Monte Carlo code for simulating molecular flows and for calculating angular coefficients in the compute unified device architecture environment", J. Vac. Sci. Technol. A 27, 1017 (2009);