Arc Snubbers Neutral Beam Sources

PDF Version Also Available for Download.

Description

At LBL it has been observed and verified many times that the amount of 1/2 CV{sup 2} energy associated with the accel grid that a neutral beam source can tolerate under sparkdown conditions is quite limited. If this energy exceeds approximately 5-7 Joules, serious degradation of the voltage holding capability of the source occurs. To allow a margin of safety, a 3 Joule maximum has been set as a design goal. It is perhaps relevant to note here that this limitation does not occur in the case of high vacuum modulator tubes where 50 Joules is acceptable and even beneficial. ... continued below

Creation Information

Baker, W. R. January 1, 1979.

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.

Author

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

At LBL it has been observed and verified many times that the amount of 1/2 CV{sup 2} energy associated with the accel grid that a neutral beam source can tolerate under sparkdown conditions is quite limited. If this energy exceeds approximately 5-7 Joules, serious degradation of the voltage holding capability of the source occurs. To allow a margin of safety, a 3 Joule maximum has been set as a design goal. It is perhaps relevant to note here that this limitation does not occur in the case of high vacuum modulator tubes where 50 Joules is acceptable and even beneficial. The difference is apparently associated with the few microns of gas present in neutral beam sources. This provides a much faster space charge neutralization capability in the accel gap so that a high current discharge can develop in a few nanoseconds. In a vacuum tube where the neutralizing ions must come from the electrodes, the time is much longer. A study of the latter type of breakdown was made for a switch-tube project at LLL, where this was found to be 1-2 {micro}secs. In a source, the discharge can be much more localized because of the gas and, in fact, may become a 'pinch' type discharge where the magnetic field of the arc column focuses the discharge into a small channel.

Source

  • Neutral Beam Power System Workshop, Berkeley, CA, January 17-18, 1979

Language

Item Type

Identifier

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

  • Report No.: LBL-8769
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 1022109
  • Archival Resource Key: ark:/67531/metadc846444

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

  • January 1, 1979

Added to The UNT Digital Library

  • May 19, 2016, 3:16 p.m.

Description Last Updated

  • Oct. 4, 2017, 3:28 p.m.

Usage Statistics

When was this article last used?

Yesterday: 0
Past 30 days: 1
Total Uses: 5

Interact With This Article

Here are some suggestions for what to do next.

Start Reading

PDF Version Also Available for Download.

Citations, Rights, Re-Use

Baker, W. R. Arc Snubbers Neutral Beam Sources, article, January 1, 1979; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc846444/: accessed October 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.