Hello,
Thanks for reaching out to us. We can certainly look into adding Plasma Physics to our list of Domains/Subdomains. In the meantime, you can find information on authors, journals, and conferences by searching Academic Search for the keywords "Plasma Physics."
For example: http://academic.research.microsoft.com/Keyword/31448/plasma-physics.
Please let us know if there is any other support we can provide.
Best regards,
Thomas, Academic Search Editor