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Additional
dynode
English Wikipedia - The Free Encyclopedia
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Dynode
A
dynode
is an
electrode
in a
vacuum tube
that serves as an
electron multiplier
through
secondary emission
. The first tube to incorporate a dynode was the
dynatron
, an ancestor of the
magnetron
, which used a single dynode.
Photomultiplier
and
video camera tubes
generally include a series of dynodes, each at a more positive
electrical potential
than its predecessor.
Secondary emission
occurs at the surface of each dynode. Such an arrangement is able to amplify the tiny current emitted by the
photocathode
, typically by a factor of one million.
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