Patent ID: 8940128
Filing Date: 2015-01-27
Classification: H01J,H05H

Abstract:
1. A plasma processing apparatus comprising: a vacuum processing chamber; a vacuum processing chamber lid sealing an upper portion of the vacuum processing chamber; a first induction antenna arranged above the vacuum processing chamber lid; a second induction antenna arranged above the vacuum processing chamber lid and arranged outside of the first induction antenna; a first Faraday shield disposed between the first induction antenna and the vacuum processing chamber lid; a second Faraday shield disposed between the second induction antenna and the vacuum processing chamber lid; and a high frequency power supply for supplying high frequency power to the first induction antenna and the second induction antenna via a matching box; wherein the first Faraday shield and the second Faraday shield are applied with high frequency voltage from the high frequency power supply via the matching box; wherein the matching box is equipped with a first LC circuit which controls a first high frequency voltage to be applied to the first Faraday shield and which comprises a first variable capacitor and a first inductance, and a second LC circuit which controls a second high frequency voltage to be applied to the second Faraday shield and which comprises a second variable capacitor and a second inductance; wherein the plasma processing apparatus further comprises a capacitance control device configured to set a capacitance of the second variable capacitor to a capacitance larger than a capacitance at a resonance point of the second LC circuit, in a case where a capacitance of the first variable capacitor is set to a capacitance smaller than a capacitance at a resonance point of the first LC circuit, and to set the capacitance of the second variable capacitor to a capacitance smaller than the capacitance at the resonance point of the second LC circuit, in a case where the capacitance of the first variable capacitor is set to a capacitance larger than the capacitance at the resonance point of the first LC circuit.