The effect of trapped backstreaming ions on beam focus and in radiographic accelerators

PDF Version Also Available for Download.

Description

The use of electron beam accelerators in advanced X-ray radiography requires that the beam be focused to a very small spot size on a metallic bremsstrahlung converter target. The energy deposition of the beam into a small volume of target material rapidly converts the target into a high-density plasma. The space-charge density of the focused beam sets up a strong electric field at the surface of the grounded target, which then accelerates ions of target plasma and lighter contaminants into the beam. These backstreaming ions form a long channel which partially neutralizes the space charge of the beam, disrupting the ... continued below

Physical Description

401 Kilobytes pages

Creation Information

Houck, T & McCarrick, J March 1, 1999.

Context

This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this article can be viewed below.

Who

People and organizations associated with either the creation of this article or its content.

Sponsor

Publisher

Provided By

UNT Libraries Government Documents Department

Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats. The department is a member of the FDLP Content Partnerships Program and an Affiliated Archive of the National Archives.

Contact Us

What

Descriptive information to help identify this article. Follow the links below to find similar items on the Digital Library.

Description

The use of electron beam accelerators in advanced X-ray radiography requires that the beam be focused to a very small spot size on a metallic bremsstrahlung converter target. The energy deposition of the beam into a small volume of target material rapidly converts the target into a high-density plasma. The space-charge density of the focused beam sets up a strong electric field at the surface of the grounded target, which then accelerates ions of target plasma and lighter contaminants into the beam. These backstreaming ions form a long channel which partially neutralizes the space charge of the beam, disrupting the beam focus and degrading the radiographic performance. One solution to this problem is to confine the backstreaming ions in a short channel with a self-biased inductive trap. Such a trap has been proposed for testing on the ETA-II accelerator. They present numerical simulations which show the effect of the high trapped-ion charge density on the beam spot size and emittance.

Physical Description

401 Kilobytes pages

Source

  • 1999 Particle Accelerator Conference (PAC), New York, NY (US), 03/29/1999--04/02/1999

Language

Item Type

Identifier

Unique identifying numbers for this article in the Digital Library or other systems.

  • Report No.: UCRL-JC-131946
  • Report No.: 39DP01000
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 8327
  • Archival Resource Key: ark:/67531/metadc785273

Collections

This article is part of the following collection of related materials.

Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

What responsibilities do I have when using this article?

When

Dates and time periods associated with this article.

Creation Date

  • March 1, 1999

Added to The UNT Digital Library

  • Dec. 3, 2015, 9:30 a.m.

Description Last Updated

  • May 6, 2016, 1:14 p.m.

Usage Statistics

When was this article last used?

Yesterday: 0
Past 30 days: 0
Total Uses: 3

Interact With This Article

Here are some suggestions for what to do next.

Start Reading

PDF Version Also Available for Download.

International Image Interoperability Framework

IIF Logo

We support the IIIF Presentation API

Houck, T & McCarrick, J. The effect of trapped backstreaming ions on beam focus and in radiographic accelerators, article, March 1, 1999; California. (digital.library.unt.edu/ark:/67531/metadc785273/: accessed December 11, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.