any device used to prevent ions in an electron beam from striking other apparatus, especially in mass spectrometry.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
A device, such as a magnet, used to prevent ions in an electron beam from striking another apparatus, such as a cathode-ray tube screen, which could cause it to lose luminescence.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.