Definition

1. Noun:
   • A stream of electrons moving in the same direction: An "electron beam" is a focused flow of electrons, typically emitted from a source like a cathode in a vacuum, traveling along nearly identical paths.
   • A group of nearly parallel lines of electromagnetic radiation: In physics, the term can also describe a directed, narrow stream of electromagnetic energy, though this usage is more closely associated with particle beams like electrons.

Usage Examples

• Noun:
  • The old television picture tube uses an electron beam to illuminate the phosphor screen.
  • In the experiment, scientists directed an electron beam at the crystal to study its structure.
  • The welding process utilizes a high-energy electron beam to fuse the metal parts.

Advanced Usage

• "To steer/deflect an electron beam": To control or change the path of the electron stream using magnetic or electric fields.
  • Magnetic coils are used to steer the electron beam in the particle accelerator.
• "Electron beam lithography": A specialized manufacturing technique using a focused electron beam to draw very fine patterns, crucial in semiconductor fabrication.
  • Electron beam lithography allows for the creation of circuits at the nanoscale.

Variants and Related Words

• Cathode ray: A historical term often synonymous with an electron beam, especially in the context of cathode ray tubes (CRTs).
  • The cathode ray in the oscilloscope displays the electrical signal.
• Particle beam: A more general term for a stream of charged particles, which includes electron beams, proton beams, etc.
  • The hospital's therapy machine uses a particle beam to target tumors.

Synonyms

• Beam of electrons: A direct descriptive synonym.
• Beta ray (in specific contexts): A stream of beta particles (high-energy electrons or positrons) emitted from radioactive decay.

Related Phrases

• Electron beam therapy (EBT): A type of radiation therapy using an electron beam to treat superficial cancers.
  • Electron beam therapy is effective for skin cancers.
• Electron beam melting (EBM): An additive manufacturing (3D printing) process that uses an electron beam to melt metal powder.
  • The titanium component was fabricated using electron beam melting.

Noun

1. a group of nearly parallel lines of electromagnetic radiation