Precursor electrons formation before strong shock waveстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 15 февраля 2024 г.
Аннотация:A series of probe measurements of low-temperature plasma parameters ahead of the front of the incident shockwave was carried out using a double-diaphragm shock tube DDST-M of the Institute of Mechanics of MoscowState University. Such investigations are needed for determining the electron concentration in front of the shockwave. This characteristic is important for the safety of the spacecraft flight since it’s directly affects tocommunication problems during the descent and is necessary for adequate description of kinetic processesbehind the shock wave. Nitrogen, oxygen, air, and argon were used as working gases. The results obtained makeit possible to describe the processes of the photoelectric effect and photoionization of gas particles due to thehard radiation of a shock-heated medium, to evaluate the effect of these processes on the change in the probepotential, and to measure the electron concentration. The probe measurements were synchronized with theregistration of the light flux, which was carried out using an avalanche photodiode and a 9-frame video cameralocated at the end of the shock tube. Data from the camera and piezoelectric sensors record the dynamics of theopening of the diaphragm, as well as the process of formation of a shock wave in the gas under study.