The Electron Diffusion Gauge Experiment

is located at the
Princeton Plasma Physics Laboratory
P.O. Box 451
Princeton, NJ 08543

Pictures of the machine:

This experiment was built to study pure electron plasmas in Malmberg-Penning traps. The picture above (click on the image for a larger and more detailed picture) shows the orange glow of the electron-emitting filament at the axis of the trap (near the center of the picture). The light near the top of the photo is from a vacuum gauge (ionization gauge) used to monitor the pressure of the background gas, which is as low as 10^-10 Torr (1 atm = 760 Torr).

Our plasmas are confined at Princeton University where we are studying the effects background neutrals have on the plasma confinement and stability. This may lead to the development of a pressure gauge if the electron-neutral collision cross section is known. Alternatively, if the pressure is known by other means, the cross-section may be deduced.

Here is the EDG poster from PPPL's Open House 2000.

Click for Plasma Parameters

Links to groups doing similar work:

Note that this page was shamelessly copied from Ed Chao's homepage.

For questions or comments, please email