To minimize beam loss due to gas scattering, the vacuum within a beam chamber must be as good as possible The Accumulator is designed to be a high class storage ring capable of circulating the same antiproton beam for hours or days on end In order to meet the design vacuum of 3x10-10 Torr in the Accumulator provisions have been made to literally bake the Accumulator beam pipe in situ This causes water vapor, oils, and other contaminants trapped inside the stainless steel to outgas Turbo and Ion pumps take care of the effluent A bakeout is done at temperatures of >100º C Other devices that are baked out are the Tevatron Lambertsons and Seperators