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A thermal vacuum test chamber, with its door open, at NASA's Johnson Space Center. A thermal vacuum chamber ( TVAC ) is a vacuum chamber in which the radiative thermal environment is controlled. Typically the thermal environment is achieved by passing liquids or fluids through thermal shrouds for cold temperatures or through the application of ...
As of 2013, it is the largest high-vacuum, cryogenic-optical test chamber in the world, 55 feet (17 m) in diameter by 90 feet (27 m) tall. It is equipped with a gaseous helium shroud capable of lowering temperatures to 11 K (−439.9 °F; −262.1 °C).
The aluminum test chamber is a vacuum-tight aluminum plate vessel that is 100 feet (30 m) in diameter and 122 feet (37 m) high. Designed for an external pressure of 2.5 psi (17 kPa) and internal pressure of 5 psi (34 kPa), the chamber is constructed of Type 5083 aluminum which is a clad on the interior surface with a 1 ⁄ 8 in (3.2 mm) thick type 3003 aluminum for corrosion resistance.
The facility consists of a 7-foot-diameter by 21-foot-long chamber containing a full gaseous helium thermal shroud. The chamber is surrounded by a Class 100 Clean Room with an adjoining Class 1000 build-up area. The 7V chamber can be conditioned from atmospheric pressure to 10 −7 torr. [1]
Pressure inside a vacuum chamber for laser cooling of atoms (magneto-optical trap) [12] 10–700 nPa Atmospheric pressure in low Earth orbit , around 500 km altitude [ 13 ] [ 14 ]
Space Environment Simulation Laboratory; two very large thermal-vacuum chambers for testing flight hardware, designated as a National Historic Landmark: 1966 [6] 33 Space Environment Simulation Test Facility with several small thermal-vacuum chambers for testing flight hardware 1966 [6] 34 35