primary beam

noun Physics.
See under secondary beam. Unabridged

secondary beam

noun Physics.
a beam of particles of one kind selected from the group of particles produced when a beam of particles from an accelerator (primary beam) strikes a target. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To primary beam
Example sentences
Plans for the next two years include improved resolution, data collection, and
  primary beam focusing.
If the human holder's hands are in or near the primary beam, then ring badges
  must also be provided.
Accelerators generate ionizing radiation when the primary beam is activated.
If procedures require an individual's extremities to be in or near the primary
  beam, then ring badges should also be used.
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