Patent ID: 9605667
Date: 2017-03-28
CPC Classifications: B01D,F04B

Claim:
1. A cryopump comprising: a radiation shield comprising a shield front end that defines a shield opening, a shield bottom portion, and a shield side portion that axially extends between the shield front end and the shield bottom portion; and a cryopanel assembly cooled to a lower temperature than that of the radiation shield, comprising a first panel arrangement and a plurality of second panel arrangements, the first panel arrangement comprising a plurality of flat plate adsorption panels axially arranged between the shield opening and the shield bottom portion, each flat plate adsorption panel comprising a back surface adsorption area provided to capture a non-condensable gas by adsorption and arranged axially above and adjacent to a corresponding second panel arrangement, each second panel arrangement comprising a plurality of axially extending adsorption panels circumferentially arranged below the back surface adsorption area to form a plurality of adsorption sections, each adsorption section being exposed to the shield side portion, each axially extending adsorption panel comprising an axially extending adsorption area being differently angled depending on an axial distance from the shield opening to the axially extending adsorption panel, wherein the axially extending adsorption panels extend from only a bottom of the flat plate adsorption panel and away from the shield opening.