Русско-английский научно-технический словарь
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• To confine the beam to the interaction space, ...
• The electrons are confined to the ring-shaped region by a magnetic guidefield.
• The plasma is held in place (or confined, or contained) with a magnetic field.
• Large diameter studs effectively secure the column in position.
• Both the electrons and the light can be confined to a small volume in the single-heterostructure laser.