magnetic mirror

noun Physics.
a region in a magnetic bottle where the magnetic field increases abruptly, causing charged particles that enter it to be reflected.

Origin:
1890–95

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World English Dictionary
magnetic mirror
 
n
physics a configuration of magnetic fields used to confine charged particles, as in a magnetic bottle

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

magnetic mirror

static magnetic field that, within a localized region, has a shape such that approaching charged particles are repelled back along their path of approach

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The region of enhanced magnetic field is referred to as a mirror field or magnetic mirror.
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