This is a high performance vacuum system for development of advanced ion propulsion thruster. The parameters of the vacuum system are: pumping speed 450l/s, volume of the chamber 45l, pumping time to 10^-6mbar 10 min, to 10^-7mbar 30 min, time to open 10 min. This system is my design. I can provide consultancy about high performance vacuum systems. iongaspropulsion is a part of Starskite, www.starskite.com