THE INFLUENCE OF HIGH ENERGY ELECTRONS AND CONTAMINATION ON LANGMUIR PROBE DIAGNO-STICS OF GAS DISCHARGED

In the typical method of Langmuir Probe diagnostics of laboratory plasma, only iorr current correction is made. In fact, some electrons escaped from the filament, are accelerated through DCelectric field, they make electron temperature observed by probe "greater" than its real value. The error of electron temperature distorted by high energy electrons is as large as 80%-200%. At the same time, the measurement error of saturated electron current caused by high energy electrons is 70%-150%, that is also the measurement error of electron density. The error caused by the probe surface contamination is also discussed.