Damon is preparing a beam/plasma interaction experiment in which a low energy (2 -10 kev) proton beam encounters a trapped electron plasma.

Damon is also developing numerical simulation techniques for following the time evolution of a few thousand trapped particles. Visit his website for animated gif examples and more detail on this aspect of his research. Press here.

Dennis has carried out a beam physics experiment (CE74) using the IUCF (Indiana University Cooler Facility) storage ring. This work has been published (Beam Electron Microprobe, D. Stoller, T. Dueck, M. Muterspaugh, R. E. Pollock, Nucl. Instrum. Methods A423 489-492 (1999)). A fuller account forming a PhD Dissertation is nearing completion.

He has a new home page on the Web under development. Visit Dennis

In his experiment, a probe beam of low energy electrons senses the electric field of an electron-cooled beam in the Cooler and provides information about the equilibrium beam profile and its time evolution, with sub - mm resolution.

One of the technical details is the need for an electron beam of small diameter. Numerical simulations in cylindrical geometry show that by creating a "virtual Pierce cone" intercepting only the tip of an emitter with low work function (LaB6), a beam can be formed with an acceptably small diameter of a fraction of a millimeter.

A representative example of the program output is shown below.

Some photos of gun and collector mounting details are available. (about 50 kBy) Press here

Matt worked with Stoller and Pollock on the probe beam project and the plasma project.

Matt graduated from Indiana University and is now a graduate student at M.I.T.

An overhead view of the electron probe, installed in the "S" straight section of the IUCF Cooler during the 1998 runs, is shown below. Proton beam direction is left to right. Electron gun is lower right and collector is lower left. Magnetic shielding covers most of the thirty-two coil field configuration. A schematic shows more of the interior detail. Try e-probe schematic

photo by Jim Crail

• About Non-Neutral Plasmas
• About Indiana accelerators and their uses
• R. E. Pollock Home Page

E-mail: pollock@iucf.indiana.edu

Phone: (812)-855-8306

Fax: (812)-855-6645