Patent ID: 8970114
Filing Date: 2015-03-03
Classification: H01J

Abstract:
1. A temperature controlled dielectric window of an inductively coupled plasma processing chamber comprising: a dielectric window forming a top wall of the plasma processing chamber having at least first and second channels therein, each of the first and second channels having an inlet and outlet to circulate temperature controlled liquid in the channels; and a liquid circulating system having a source of cold liquid circulating in a first closed loop which is not in fluid communication with the channels, a source of hot liquid circulating in a second closed loop which is in fluid communication with the channels, and at least first and second heat exchangers; the first heat exchanger connected to the source of cold liquid, the source of hot liquid and the inlet of the first channel such that the cold liquid passes through the first heat exchanger at a controllable flow rate and temperature of the hot liquid is adjusted by heat exchange with the cold liquid as the hot liquid passes through the first heat exchanger and then through the inlet of the first channel; the second heat exchanger connected to the source of cold liquid, the source of hot liquid and the inlet of the second channel such that the cold liquid passes through the second heat exchanger at a controllable flow rate and temperature of the hot liquid is adjusted by heat exchange with the cold liquid as the hot liquid passes through the second heat exchanger and then through the inlet of the second channel.