High-power excilamps with short-pulse duration

Abstract

The possibility of creation of capacitive discharge excilamps with short pulse duration was studied. There were three types ofpulsed excilamps in experiments: cylindrical glow discharge lamp, capacitive discharge iamp, high pressure volume discharge planar lamp with UV-preiomzation of discharge gap. In capacitive discharge cylindrical KrC1-excilamp, at ?222 nm the radiation pulse power through the end face of a lamp up to 2.5kW has been obtained. Powerful radiation pulses of 50 ns in duration were obtained at pulse repetition rate of 1 kHz. In case ofhigh pressure volume discharge at operating pressure of several atmospheres the radiation peak power density values were as much as 5 kW/cm2 at X25O mn, and 3.5 kW/cm2 at 2v222 nm and at X'3O8 nm. In cylindrical longitudinal excilamp with inner electrodes with Xe-I2 mixture the total pulse power of 75 kW has been obtained. The first experiments with harnessing of inductive energy stores for excilamp excitation have been carried out.

Optimum transformer turns ratio for the power supply of dielectric barrier discharge lamps

“…An expression for the normalised lamp peak voltage can be obtained by relating the normalised current at breakdown from the state plane before ignition (7) to the breakdown current in the state plane after ignition (11). Only when the condition V in < V th is fulfilled, the converter will properly operate.…”

“…For correct performance, DBD devices require a high-voltage power supply with a bipolar current waveform [10]. Traditional power supplies for DBDs use voltage sources [11][12][13]: these converters only inject current into the plasma if there is variation in the lamp voltage, resulting in a current spike. Therefore, it is difficult to control the amplitude and duration of the lamp current [10].…”