3.6M north10.pdf - Dean-O's Toy Box
3.6M north10.pdf - Dean-O's Toy Box
3.6M north10.pdf - Dean-O's Toy Box
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
196 High-Power Microwave-Tube Transmitters<br />
One of six ~arelleiRG-19 cebtas<br />
, (oneper@r of capacitorgroups)<br />
1<br />
One of fourparallelRG-19 cables<br />
~ (h@volfageonshietd)<br />
u \“<br />
al=<br />
one offour RG-19<br />
cab!esto output<br />
transformerprlrnary<br />
winding<br />
i! Cm of 12 groupsof sixseriasconnectedcapacitors,0.5<br />
~ each,<br />
72 ~ total<br />
L<br />
MuRipfaairqsp (12 gaps)<br />
crowbarswitch<br />
& Ona of eQht M-6461<br />
switchtubas<br />
fr!ode<br />
Figure 10-35. Physical arrangement of components of 200-MW hard-tube moduhztor (end view: parallelconnected<br />
components extend into the page).<br />
lay the pulse output information so that the conditions immediately preceding an<br />
arc could be captured on a conventional storage oscilloscope that was triggered<br />
by the arc event itself. (This is a data-collection problem ideally suited to today’s<br />
continuous-sampling digital storage oscilloscopes.) Unfortunately, the results<br />
showed that the vast majority of arcs occurred precisely at the end of a current<br />
pulse, when the switch tubes were being switched to the voltage-blocking state.<br />
So common were these that the acronym EOPSTA was used as log-book shorthand<br />
for “end-of-pulse switch-tube arc.”<br />
The first experimental objective to become a casualty of this problem was<br />
pulse fall time, which was originally intended to be 0.1 W. Of course, the culprit<br />
one of fourIowimpednceshfptransmissionrk<br />
[16 In/wide,extendirwhto tha PM@]<br />
CMw!of fourFIG-19<br />
cablesto pulsetransfonnerprimary<br />
Windklg<br />
I<br />
●<br />
●<br />
●<br />
h<br />
w<br />
One of fourRG-19 csblas<br />
to crowbarSwifsfl .<br />
c4<br />
I<br />
—<br />
Ons of fourgroupsof 16 perallel<br />
capacitors(e!ghtN@, two<br />
dsep,extendingintothe page)<br />
Ons of fourgroupsof two<br />
parallelWL-8461 triWes<br />
Figure 10-36. fipenmental use of low-impedance strip transmission line to reduce inductance of pnmarycurrent<br />
loop of 200-M W hard-tube modulator.