before my visit, I called Melvin Gottlieb to ask his permission. He was then Princeton Plasma Physics Lab director. I just found his obit at
http://www.princeton.edu/pr/pwb/01/0108/2a.shtml
Once I got to the facility, they did not let me in at once. I had to wait almost half a day at the plasma library. At first they thought I was some government official checking out the lab since it was funded by the U.S. Energy Department, which was called ERDA at that time.