magnetic bottle

noun
Physics. a magnetic field so shaped that it can confine a plasma: used in a proposed design for fusion reactors.

Origin:
1955–60

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World English Dictionary
magnetic bottle
 
n
a configuration of magnetic fields for containing plasma

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
But before break-even could be achieved, unexpected instabilities set in, causing the magnetic bottle to spring leaks.
In addition, the detector could be placed inside a magnetic bottle to screen out magnetic noise.
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