Abstract: A conventional substrate processing apparatus for generating plasma cannot generate plasma with high density and thus throughput of substrate processing is low. In order to solve this problem, provided is a substrate processing apparatus including a reaction vessel having a tubular shape and provided with a coil installed at an outer circumference thereof; a cover installed at a first end of the reaction vessel; a gas introduction port installed at the cover; a first plate installed between the gas introduction port and an upper end of the coil; a second plate installed between the first plate and the upper end of the coil; a substrate processing chamber installed at a second end of the reaction vessel; and a gas exhaust part connected to the substrate processing chamber.

Abstract: According to the present disclosure, there is provided a technique capable of suppressing an erroneous detection of a presence or absence of a substrate caused by a light receiver receiving a specularly reflected light. There is provided a technique that includes: a holding structure provided with a placing surface capable of accommodating a substrate thereon; a light detector including: a light emitter arranged to irradiate an irradiation light toward a back surface of the substrate placed on the placing surface; and a light receiver arranged to be capable of receiving a diffusely reflected light of the irradiation light irradiated from the light emitter without receiving a specularly reflected light of the irradiation light; and a controller configured to be capable of determining a presence or absence of the substrate based on a light receiving state of the light receiver.

Abstract: In a detection apparatus for determining the operability of lighting circuits, a high frequency oscillator operates at a frequency different from that of the power source for the lighting circuits. An electrical element having a high impedance at the oscillator frequency is connected in series with the lighting circuits. Another electrical element having substantially a constant impedance supplies the oscillator output to a connection point between the first electrical member and the lighting circuits. A detecting circuit determines failure of at least one of the lighting circuits by detecting the presence of a high frequency voltage at the connection point. The detected high frequency voltage is rectified and used to indicate failure of the lighting circuit or circuits.