particle beam

Thân thiện

A scientist adjusts the controls for a particle beam experiment.

Definition

Noun: A particle beam is a highly focused, directional stream of subatomic particles (such as electrons or protons) or atomic particles (such as ions or molecules). The particles are accelerated to high speeds and travel in a tightly controlled, collimated path.

Usage

The term "particle beam" is used primarily in physics, engineering, and military contexts to describe a controlled flow of energetic particles. * In scientific research, a particle beam is used to probe the structure of materials or to induce nuclear reactions. * The concept of a directed-energy weapon often involves a high-power particle beam. * Medical devices, such as certain types of cancer therapy machines, utilize a particle beam to target tumors.

Examples

• The physicist adjusted the magnetic lenses to focus the particle beam on the target sample.
• Science fiction often features starships armed with particle beam weapons.
• Proton therapy delivers a precise particle beam of protons to destroy cancer cells while sparing surrounding healthy tissue.

Advanced Usage

• Charged particle beam: A particle beam where the constituent particles carry an electrical charge (e.g., electron beams, proton beams). This is the most common type, as charged particles can be easily accelerated and steered using electromagnetic fields.
• Neutral particle beam: A beam composed of particles with no net electrical charge (e.g., neutron beams). These are more difficult to produce and control, as they do not respond to magnetic fields.

Variants and Related Words

• Particle accelerator (n): A device, such as a cyclotron or linear accelerator, that uses electromagnetic fields to propel charged particles to high speeds and form a particle beam.
• Beam (n): In this context, a ray or stream of particles or electromagnetic radiation. "Particle beam" is a specific type of beam.
• Collimated (adj): Made parallel. A key characteristic of a particle beam is that it is collimated to prevent it from spreading out.

Synonyms

• Particle stream
• Directed particle flow

Related Phrases

• Particle beam weapon: A theoretical or experimental weapon system that uses a high-energy particle beam to damage a target.
• Particle beam therapy: A type of external radiation therapy that uses particle beams (like protons or carbon ions) for cancer treatment.

Học thuật

Noun

1. a collimated flow of particles (atoms or electrons or molecules)