a region in a magnetic bottle where the magnetic field increases abruptly, causing charged particles that enter it to be reflected.
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British Dictionary definitions for magnetic mirror
physics a configuration of magnetic fields used to confine charged particles, as in a magnetic bottle
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012