The closed switch
becomes a short-circuit across the PFN.
Therefore, the PFN discharges
rapidly through the load, forming a rectangular pulse. The reason the pulse
is rectangular is that the PFN discharges through a load resistance equal to
Thus, the pulse amplitude is
3,000 volts DC, half the voltage to which the PFN is charged.
width is equal to two TDs.
4. So you see, the rectangular pulse used to trigger the magnetron into
oscillation is actually formed during the discharge of the PFN and at a high
Because of the high voltage at which it must operate, a
conventional ATL cannot be used. The capacitors in the line would have to
be very large to withstand the high voltage.
So, a specially-constructed
ATL is used, called a Guillemin line.
5. Figure 55 shows the schematics of two types of Guillemin lines used
The network in Part A simulates the
capacitors in the individual sections are in parallel. A single capacitor,
Cst, stores the entire high-voltage charge.
The L-C circuits develop
oscillatory voltages which add to the voltage of the storage capacitor Cst
The oscillatory voltages make the network
voltage fall to zero in two equal steps.