Discharge circuits and loads Page: 56 of 62
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DISCHARGE CIRCUITS AND LOADS
Capacitor cost can be reduced by allowing a small, say 20%, reversal and
designing for maximurn energy transfer in the first current half cycle. If
the light output of the lamp and the energy to be deposited in the lamp are
known, the explosion limits for relatively long pulses can be determIned.
When the energy stored in the capacitor is equal to the determined energy,
there is a 50% chance that the lamp will blow up. In most circuits, it has
been fund that the longer lamps can be operated near the explosion limit.10
The most convenient way to trigger a flashlamp is with a series
injection trigger transformer, usually on the ground end. This generates a
pulse that exceeds the self-break voltage of the lamp and the lamp turns
on. The fluctuations in the breakdown time can be significantly reduced by
overvolting the lamp by a factor of 2.
C. Carbon Dioxide Laser Load
There are two kinds of C02 lasers: electron beam lasers and TEA
lasers. The latter are similar to the Excimer laser, wherein their
impedance decreases with time, but at a slower rate. The C02 lasers with
electron-beam-controlled discharge systems, for example, basically act as
resistive loads with some turn-on voltage. The gas discharge voltage can
be provided by a Marx bank. If the pumping voltage wave form 1s altered to
r1 more quickly the gain rises faster, permitting more energy to flow out
of the system for shorter optical pulses into it. Experimenters have
looked into i type C PFN, with two sections (two L and C, one each per
section in the PFN) and have derived the voltage pulse shown in Fig. 28.
This worked very well.11
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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/m1/56/: accessed April 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.