Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Direct Imaging of Static and Dynamic Ion Cloud Distributions in an Electron Beam Ion Trap



James V. Porto


We have used long-lived uv transitions in the ground term of Ars13+, Xe31+ and Xe32+ to directly image highly charged ions within an electron beam ion trap (EBIT). Using an intensified CCD camera, we have the capability to measure both static and dynamic ion cloud distributions. The technique provides information about the distribution of trapped highly charged ions which is difficult to obtain by other methods. Static images can be used to determine ion temperatures and the degree of overlap between the electron beam and ion cloud. Dynamic images are sensitive to electron-ion heating rates, ion-ion collision rates and the dynamics of cross field diffusion. The new information can eventually be used to test and improve detailed models of ionization balance and ion cloud dynamics within the EBIT. Combined with improved modeling, experiments like these can be used to assist a wide variety of measurements of atomic data in electron beam ion traps,particularly those involving charge changing cross sections.
Proceedings Title
Sigma Xi Post Doctoral Poster Presentations, 2000
Conference Dates
February 17-18, 2000
Conference Title
Sigma Xi Web Page


electron beam ion trap, highly charged ions, ion cloud distributions, measurements of atomic data, uv transitions


Porto, J. (2000), Direct Imaging of Static and Dynamic Ion Cloud Distributions in an Electron Beam Ion Trap, Sigma Xi Post Doctoral Poster Presentations, 2000 (Accessed June 15, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created February 1, 2000, Updated February 17, 2017