Discharge circuits and loads Page: 46 of 62
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DISCHARGE CIRCUITS AND LOADS
XI. OPEN-CIRCUIT PROTECTION WITH CABLE INTERCONNECTIONS
Referring to Fig. 21, if the load is shorted, a wave is sent back and
is multiplied repeatedly until the cable breaks down. If L and R are cor-
rectly chosen, the voltage pulse cap; be reduced significantly. In large sys-
tems with very high voltages there is no choice but to do this. In single-
shot systems, a single point-plane spark gap connected to ground through a
copper sulphate resistor is used to offer additional protection. If the
laser faults, it sends back a -V and the point-to-plane gap across the cable
input breaks down controlling this voltage. Such spark gaps can be used for
high repetition rate systems, but erosion and gas flow needs may pose prob-
lems. In another circuit, the switch can be self-triggered. If relatively
long pulses are used, a triggered spark gap protector can be added. When the
wave comes back, a capacitive divider reduces the voltage and, fed through a
diode, triggers the spark gap.
For cable connections to the load, either a shunt spark gap to ground
or a shunt L/R network at each end of the cable is suggested to protect
Figure 22 is a useful compilation of information on inductive loads
prepared by Bill Nunnally.
XII. LASER LOADS
A. Direct-Discharge Pumped Excimer Laser Loads
Rare-gas halogen lasers, of considerable interest as sources of
intense ultraviolet energy, represent one of the most challenging time-
varying loads to come into existence in the last decade (Fig. 23). One of
the difficulties in these systems is their time-varying nature.
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Sarjeant, W.J. Discharge circuits and loads, report, October 15, 1980; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1061299/m1/46/: accessed April 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.