Patent ID: 7671294

Claim:
A twin plasma apparatus comprising: two plasma heads, each comprising an electrode, one comprising an anode and defining an anode plasma head and one comprising a cathode and defining a cathode plasma head, wherein said plasma heads are capable of generating an arc between said cathode and anode, each of said plasma heads comprising a plasma flow channel to thereby define first and second flow channels and a primary gas inlet disposed between at least a portion of said electrode and said plasma flow channels, said cathode plasma head and said anode plasma head being oriented at an angle toward one another; and each of said plasma flow channels comprises a first generally cylindrical portion adjacent to said electrode and having a diameter D1, a second generally cylindrical portion, adjacent to said first portion, having a diameter D2, and a third generally cylindrical portion, adjacent to said second portion, having a diameter D3 , wherein D1<D2<D3; wherein said arc that is generated between said cathode plasma head and said anode plasma head is such that the arc passes sequentially from D1, D2 and D3 of said first flow channel and sequentially to D3, D2 and D1 of said second flow channel.