Patent ID: 7294842

Claim:
Apparatus for measuring the transport time of impurity particles in a plasma comprising: a spectrometer means for the spatially-resolving conversion of light exiting the spectrometer into charge, an integrator circuit for the spatially-resolving integration of the charge, and means for displaying the charge that is integrated dependent on its position, characterized in that the integrator circuit is assembled from discrete components comprising a fast response operational amplifier, a quick operating switch, a network having a time constant of 21 ns comprising a first resistor and a capacitor, a line driver, second and third resistors, and the means for conversion comprises an EDR-MCP detector, an output of which is coupled to an input of the integrator circuit, wherein the operational amplifier, the first resistor and the capacitor are interconnected with one another and the second and third resistors are arranged between the capacitor and the switch and, together with the internal resistance of the switch, provide for the deletion of signals of the capacitor in about 50 ns and the prevention of switch currents beyond an allowed maximum.