Patent ID: 8528762

Claim:
A chamber body comprising a plurality of pieces coupled together to collectively form the chamber body having an inside surface with four corners, the chamber body comprising: a first piece comprising: a first portion having a first length greater than a first width and a first opening extending therethrough; a first flange extending a first distance from the first portion in a direction substantially perpendicular to the first width, the first flange extending from a first corner of the four corners; and a second flange extending a second distance from the first portion in a direction substantially perpendicular to the first width, the second flange extending from a second corner of the four corners; a second piece coupled to the first flange and extending in a direction substantially perpendicular to the first width; a third piece coupled to the second flange and extending in a direction substantially perpendicular to the first width and parallel to the second piece; a fourth piece coupled to the second piece and the third piece, the fourth piece comprising: a second portion having a second length greater than a second width and a second opening extending therethrough; a third flange extending a third distance from the second potion in a direction substantially perpendicular to the second width; and a fourth flange extending a fourth distance from the second portion in a direction substantially perpendicular to the second width; a first plate coupled to the first piece, the second piece, the third piece and the fourth piece; a second plate coupled to the first piece, the second piece, the third piece and the fourth piece such that the first plate, the second plate, the first piece, the second piece, the third piece and the fourth piece collectively enclose a chamber volume; and a coating disposed on at least one of the first plate and the second plate, the coating having an emissivity that is greater than the emissivity of at least one of the first piece, the second piece, the third piece and the fourth piece.