Alternating-gradient focusing
noun
(physics) a method of focusing beams of charged particles in high-energy accelerators, in which a series of magnetic or electrostatic lenses alternately converge and diverge the beam, producing a net focusing effect and thus preventing the beam from spreading
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to interchange repeatedly and regularly with one another in time or place; rotate (usually followed by with): day alternates with night. to change back and forth between conditions, states, actions, etc.: he alternates between hope and despair. to take turns: my sister and i alternated in doing the dishes. electricity. to reverse direction or sign […]
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