Microparticle Charge Screening in Non-Equilibrium Plasmas with Two Types of Positive Ions

✍ Scribed by A. V. Filippov; I. N. Derbenev

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 304 KB
• Volume: 49
• Category: Article
• ISSN: 0005-8025
• DOI: 10.1002/ctpp.200910091

✦ Synopsis

The study of screening a microparticle charge in a plasma taking into account sinks of electrons and ions to the microparticle and bulk processes of their production and loss in a plasma is reported. The research objective is to investigate the effect of the conversion of atomic ions Ar + to molecular ones Ar + 2 on character of screening in a plasma with an external ionization source. It is determined that the plasma due to the ion conversion consists of two positive ion species. This circumstance leads to the three-exponential charge screening, moreover there exists a region of plasma parameters where all the screening constants have comparable values. Numerical simulation of microparticle charging on the basis of the drift-diffusion approach is performed and comparison of the obtained data with the analytical results is fulfilled.