
A storage ring is a type of circular particle accelerator in which a continuous or pulsed particle beam may be kept circulating for many hours. Storage of a particular particle depends upon the mass, energy and usually the charge of the particle to be stored. Storage rings most commonly store electrons, positrons, or protons. Storage rings are mos...
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http://en.wikipedia.org/wiki/Storage_ring

[
n] - container consisting of a set of magnets set in a doughnut-shaped ring around which charged particles from an accelerator can be kept circulating until they are used
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http://www.webdictionary.co.uk/definition.php?query=storage%20ring
noun container consisting of a set of magnets set in a doughnut-shaped ring around which charged particles from an accelerator can be kept circulating until they are used
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https://www.encyclo.co.uk/local/20974

A circular (or near circular) structure in which either high energy and/or positrons, or protons and/or antiprotons can be circulated many times and thus "stored". Used to achieve high energy collisions. Because of the very different masses of protons and electrons a storage ring must be designed for on...
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https://www.encyclo.co.uk/local/21257

a device for storing charged particles fed from an accelerator, consisting of a set of magnets placed in a ring and adjusted to keep the particles circulating until they are used.
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https://www.infoplease.com/dictionary/storage-ring
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