Patent ID: 8829770

Claim:
An electrode cooling system for a multi-electrode microwave plasma excitation source, comprising the electrode cooling agent supply and removal systems, while the excitation source consists of at least three identical electrodes arranged symmetrically in relation to the axis of a central tube which supplies an analytical sample and the electrodes are mounted in an electrically isolated metal housing so that the electrode tops are placed at the central tube outlet, and their ends are shorted in the power supply point with the microwave connections embedded in the housing on the extension of the electrode longitudinal axis and the connections are coupled with the microwave power source, particularly of 2.45 GHz frequency, whereas the length of each electrode measured from its top to the power supply point is ¼ L, where L is the length of the microwave generated by the microwave power source, characterized in that each electrode ( 7 ) has a hollowed longitudinal flow chamber for the cooling agent connected with metal side tubes ( 1 , 2 ), the first and the second ones, which supply and remove the cooling agent, while the outside ends (D, F) of the side tubes ( 1 , 2 ) are electrically shorted with the housing ( 10 ) and the length of each side tube ( 1 , 2 ) inside the metal housing ( 10 ), measured from the connection with the electrode ( 7 ) to the outside wall of the housing ( 10 ), is ¼ L and moreover, the side tubes ( 1 , 2 ) are isolated from the housing ( 10 ) over the entire length.