The largest vacuum chamber of ESA’s Propulsion Laboratory at ESTEC, in Noordwijk, is used for testing different types of thrusters for space. About 2 m in diameter and 5 m in length, this Small Plasma Facility is large enough to contain sections of a satellite as well as the thruster to be tested – studying how its firing interacts with nearby surfaces. Thrust forces can be measured down to micronewton levels. See http://www.esa.int/spaceinimages/Images/2017/02/Vacuum_chamber_in_Propulsion_Lab
