Everything about The Townsend Discharge totally explained
The
Townsend discharge is a gas
ionisation process where an initially very small amount of free
electrons, accelerated by a sufficiently strong
electric field, give rise to electrical conduction through a gas by
avalanche multiplication: when the number of free charges drops or the
electric field weakens, the phenomena ceases. It is a process characterized by very low current densities: in common
gas filled tubes, typical magnitude of currents flowing during this process range from about
is the Townsend discharge
breakdown voltage,
*
,
and
are respectively the
capacitance, the
resistance and the supply
voltage of the circuit.
» Since
temperature and
time stability of the characteristics of
gas diodes and
neon lamps is low, and also the
statistical dispersion of breakdown voltages is high, the above formula can only give a qualitative indication of what the real frequency of oscillation is.
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