The Scb, The Ignition Of The Plasma Electron Density Measurement Technology

The SCB plasma electron density was studied in this paper. Based on different theories, three independent systems were established and used to measure the electron density.(1) Under the supposition of local thermodynamic equilibrium (LTE), using Stark broadening of Alâ… 394.40nm to calculate the SCB plasma electron density. The results indicated that the electron density changed from 4.32×10¹⁶cm³ to 0.89×10¹⁶cm³ in the period of 10μs to 70μs. The dependence of electron density on the time delay was obtained.(2) Because the two lines of Siâ… 390.55nm and Siâ…¡413.09nm were discovered in the SCB plasma emission spectrum, based on the Saha equation, the double channel measurement system was designed and set up. The temporal resolution of the system was 0.1μs, which was superior to the domestic existing OMA.(3) The SCB plasma electron density was measured by the double channel measurement system. Two different SCB, which chip was mounted on Ceramic or plastic, were used. The electron density was discussed under the different energy input. The SCB plasma electron density was 10¹⁵cm^-3—10¹⁶cm³ in identical magnitude, comparing with result computed from Stark broadening of Alâ… 394.40nm. And the rule of the time evolution of electron density was same. The relative comparison and mutually confirms were realized between the two methods.(4) With a pressure transmitter (CY-YD-205), the SCB plasma pressure was measured, which produced in an airtight volume container. A suited state equation for the SCB plasma was established, the relation between plasma pressure and the electron density was also inferred. The maximum magnitude of electron density was 10¹⁸cm^-3.