To find technical reports (papers) specific to Princeton Plasma Physics Labs, look in PPLCat .
This is the most complete listing of PPPL reports.
Databases which include most all of the DOE (Dept. of Energy) reports are:
Full Text Databases for articles, papers, reports and dissertations:
Reference resources are listed in the Online Catalog, with links to electronic versions.
Plasma Fusion Conferences, Meetings & Symposia papers
See the listings here: http://www.pppl.gov/library/conferences.html