(5) Magnetic coil current interlock to
remove the beam power in the event of magnetic
coil power supply failure.
(6) Water temperature and collector
temperature interlocks to remove the beam power in
case of pooling failure.
1-59.
INDICATORS ASSOCIATED WITH THE
KLYSTRON
a. The most important indicators that you
will use for correct klystron tuning are the relative
power output and body current meters. These
meters are usually placed at a convenient viewing
level near the RF tuning and magnetic coil controls.
b. Your equipment will have additional
meters, as required, to monitor filament voltage,
filament current, bombarder voltage, bombarder
current, focus electrode voltage, beam voltage, beam
current, collector current, modulation anode current,
forward and backward RF drive power, forward and
backward RF output power, total elapsed beam
Figure 60. High power klystron in carriage.
hours and individual magnetic coil current.
the filament end mounted downward or in the
1-60.
PRECAUTIONS AND DANGERS
carriage (fig 60), but this does not make them safe.
a. The high voltages klystron power
d. Learn the danger spots of the klystron
amplifiers can be instantly deadly even if
amplifier and power supply. You should never place
accidentally and momentarily touched. Always
full confidence in any interlock circuit which is
know what you are doing and never allow yourself
intended to remove the high voltage from these
to become careless.
danger areas. Although these devices are usually
very reliable, the stakes are too high to gamble your
b. Do not disable safety-interlock systems
life on their proper operation.
even to make measurements. You can obtain all
required operating information from meters installed
e. The higher voltages used to obtain
in the equipment.
higher beam velocities will generate some X-rays
that leave the klystron via the ceramic and glass
c. Learn the high-voltage parts of the
sections. Since the cavities and magnetic structure
klystron amplifier. The body and cavities of the
provide some shielding, most of the X-ray radiation
klystron amplifiers are normally operated at ground
occurs near the filament-end of the tube. The X-ray
potential. The filament end, which is at a high
radiation is small, and the normal steel cubicles
(negative) voltage with respect to the body and
provides adequate protection when closed.
ground, is dangerous even though it may be covered
Prolonged operation of the klystron is not
with
air
bonnet.
Low-powered
klystrons
recommended with doors of the cubicle or
amplifier up to 10 kw frequently have the
transmitter cabinet open.
klystron mounted with the filament end
up. Higher-powered klystrons sometimes have
344 L1
56
Previous Page
