HV Laser Discharge Capacitor Applications
Laser Pulse
Discharge
High Voltage Accelerometers
High
Voltage Pulse Discharges are required to energize the
laser gases thus breaking them down. They are obtained by
rapidly discharging electrical energy stored in high
voltage capacitors
How
and why these capacitors are used
Dielectric
materials based, in the main, on Barium Titanate are
generally used in high voltage disc ceramic capacitors.
However due to it's relatively high dissipation factor,
high capacitance loss with applied voltage and inherent
piezoelectric / electrostrictive effect they are
unsuitable for use in high energy 1 fast discharge
applications.
This
range of capacitors incorporates a Strontium Titanate
ceramic dielectric which exhibits excellent electrical
properties which include:
High
Dielectric Strength: which in conjunction with correct
choice of encapsulation material allows for high energy
densities.
Low
capacitance loss at rated voltage: thus maximizing the
energy density.
No
piezoelectric/electrostrictive effect: allowing for use in
extremely high peak currents (fast discharge) / high shot
life applications.
Low
dissipation factor: allowing use in high 1 peak
current/high repetition rate circuits.
Typical
Circuit
Cb =
Storage capacitor bank
Cp = Peaking / pulsing capacitor bank
Both the above compromise 20 - 200 off discs
Typical
Data
| Charging
voltage |
20 -
40kV |
| Max
repitition rate |
500Hz |
| Charge
time |
10ms |
| Discharge
time |
200ns |
| Peak
current |
500A |
| Reversal
voltage |
50% |
Typical
Discharge Waveform
You
may also find the following sections of particular
interest if you are associated with high power RF
applications:-
Capacitors Tutorial and Guides
RF Multilayer Capacitor Applications
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