Dear IVC-23 Delegate, we are offering a Vacuum Short Course that runs over the first two days of the Congress. The course, entitled "Vacuum Gas Dynamics: From Theory to Applications" is a well known course given by international experts in the field. The VSA recommends this course for those working with vacuum wanting to understand the underlying science behind making and maintaining good vacuum. Please find a flyer describing the course in detail here.

Vacuum Gas Dynamics: From Theory to Applications

Lecturers:

Prof. Felix Sharipov, Federal University of Parana, Brazil 

Prof. Irina Graur, Aix-Marseille University, France 

Dr. Oleg Malyshev, Daresbury Laboratory, UK 

Aims and motivation:

This course is designed for students, scientists, and engineers who are  not experts in Rarefied Gas Dynamics but encounter this field in their routine work. While  textbooks and handbooks on vacuum technology typically cover only the fundamentals of gas  dynamics, they often lack the depth needed to understand modern analytical and numerical  modeling methods. On the other hand, specialized literature can be too complex for non-experts. This short course provides foundational training in Vacuum Gas Dynamics, offering a  structured and rigorous introduction to the field. It covers relevant theoretical and experimental  methods for practical applications. No prior knowledge of gas dynamics is required. 

Topics: 

• Theory: Molecular free path, gas rarefaction and flow regimes. Velocity distribution  function. Gas-surface interaction. Accommodation coefficients. Free-molecular flows.  Analytical solutions in the free-molecular limit. Test particle Monte Carlo method.  Velocity slip and temperature jump conditions. Analytical solutions of the Navier-Stokes  equations subject to the slip and jump conditions. Intermolecular interaction and kinetic  equation. Flows in the transition regime. Discrete velocity method. Direct simulation  Monte Carlo method. Main numerical solutions in the transitional regime with examples  of their applications: Poiseuille flow, Couette flow, heat transfer. Transient flows. Numerical models of Holweck and turbo-molecular pumps. Numerical model of Pirani  sensor. Rarefied flow calculator. Modelling of gas dynamics processes in vacuum  chambers. 

• Experiments: Specifics of the experiments at micro scale; efficiency of the micro scale  experiments to obtain the properties of the rarefied gases. Experimental characterization  of the gas-surface interaction. The relations between the theoretical and experimental  approaches. Experimental data analysis. Review of main experimental results.  

• Applications: Design of large UHV vacuum systems in free molecular flow regime.  Vacuum specification and input parameters. Experimental data: measurements, data  analysis, extrapolation and using. Models: overview of different models used with an  emphasis on 1D diffusion analytical model and numerical models (test particle Monte  Carlo and angular coefficients), pumps and sources of gas in different models. Simplifying CAD models for simulations. Predicting 3D pressure profiles with  simulations. Optimization based on results. From a model to a mechanical design. Analysis of errors and uncertainties in a final design. Examples of design. 

Short courses schedule: 

Monday 15 September 

Morning 9:00-12:30 

9:00-10:30 Fundamentals of kinetic theory, FS 

10:30-11:00 Coffee break 

11:00-12:30 Simulations of gas flows under vacuum conditions (overview), IG 

Lunch 12:30-14:00 

Afternoon 14:00-17:30 

14:00-15:30 Fundamentals of DSMC method and examples of its applications, FS 

15:30-16:00 Coffee break 

16:00-16:45 TPMC modelling, OM 

16:45-17:30 Interphase conditions with evaporation and condensation, IG 

17:30-18:00 Discussion with the lectures  

Tuesday 16 September 

Morning 9:00-12:30 

9:00-10:30 Gas dynamics calculations for a design of vacuum system, OM

10:30-11:00 Coffee break 

11:00-12:30 Measurements of conductance and accommodation coefficients, IG

Lunch 12:30-14:00 

Afternoon 14:00-17:30 

14:00-15:30 OM Gas-surface interaction on impermeable surface, FS 

15:30- 16:00 Coffee break 

16:00- 17:30 Vacuum Gas Dynamics for Particle Accelerators, OM 

17:30-18:00 Discussion with the lectures 

Instructional material: The participants will get hard and electronic copies of presentations and  numerical codes to solve basic problems of vacuum gas dynamics.