narrow-gap spark chamber

narrow-gap spark chamber

[′nar·ō ¦gap ′spärk ‚chām·bər]
(nucleonics)
A type of spark chamber in which the plates are only 6 to 10 millimeters apart, so that sparks usually follow the electric field perpendicular to the plates, and coincide with the particle track at one point; the great majority of spark chambers are of this type.
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