HomeIVC-23 Short Course

IVC-23 Short Course

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 modelling methods. On the other hand, specialised 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, Coutte 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 characterisation 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. Optimisation based on results. From a model to a mechanical design. Analysis of errors and uncertainties in a final design. Examples of design.

Short Course 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 Gas-surface interaction on impermeable surface, FS

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 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.

Fees

Items	Early Fees Until August 20 ($AUD)	Standard Fee From August 21 - September 12 ($AUD)
Registration	800	1000
Student Registration	600	800

Registration fees have been kept as low as possible via the support of the VSA.

Student Registration fees may be obtained through use of a discount COUPON that will be sent to you. During the Registration process you will be asked to provide details of your supervisor and institution. Once you have completed this questionnaire and saved your registration please email anton.stampfl@vacuumau.org to ask for a student discount COUPON.

About the Lecturers

Prof. Felix Sharipov graduated from the Moscow University of Physics and Technology, Faculty of Aerophysics and Space Research in 1982. He obtained his Ph.D. in 1987 at the Ural State Technical University. In 1988 he joined the Physics Faculty of the Ural State University where he set up his activity in rarefied gas dynamics. In 1992 he moved to the Federal University of Parana in Brazil where he built up a group on numerical modelling of gas flows in microscale. His research interests are numerical methods of rarefied gas dynamics applied to microfludics, vacuum technology and aerothermodynamics. His group develops both probabilistic and deterministic approaches. He was an organizer of numerous vacuum gas dynamics meetings and schools. F. Sharipov published over one hundred fifty journal articles, several reviews and chapters in handbooks. He is an author of two books and a member of editorial board of “Vacuum” (Elsevier).

Prof. Irina Graur obtained her M.Sc. in Applied Mathematics from Moscow Lomonossov State University in 1984, followed by a PhD also from the same institution in 1989. She later earned her Habilitation from Provence University in France in 2008. From 1984 to 2000, she was an associate professor at the Keldysh Institute of Applied Mathematics in Moscow. She is currently a professor at Aix- Marseille University in France. Her research has significantly contributed to the study of rarefied gases in aerospace applications. Her current interests focus on the experimental and numerical characterization of gas properties at micro- and nanoscale levels. She leads the research group “Non-Equilibrium Phenomena and Microfluidics” at the IUSTI Laboratory. Additionally, she has organized numerous international conferences, workshops, and summer schools. She has co-authored over one hundred journal articles and conference papers.

Dr. Oleg Malyshev graduated in the Physics Department at the Novosibirsk State University in 1989. He started his carrier as a vacuum scientist at the Budker Institute of Nuclear Physics where he obtained his Ph.D. in 1995. His work includes theoretical studies, experimental research and design of various vacuum systems such as VEPP-5, ANKA, BESSY, SSC. From 1998 to 2001, he worked at CERN designing the LHC beam vacuum system. Since 2001 he works in ASTeC at STFC Daresbury Laboratory, he designed a vacuum system for Diamond Light Source, participated in R&D for International Linear Collider, FAIR, KATRIN, NLS, ALICE, etc. He leads experimental and analytical study in ASTeC Vacuum Science Group. He is an editor of international scientific journal VACUUM (Elsevier), an organizer of international workshops, meetings, an author of more than 230 scientific papers and reports. He is a Charted Physicist and a Fellow of Institute of Physics.

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