E3730A OPERATING INSTRUCTIONS
－ 16 －
During handling, the protective covers for output window must be left on the tube. Be careful
not to apply any pressure or shock on the tube. The klystron is designed to be supported at the
collector shielding bracket or the collector pole-piece. Ceramic-metal seals at the electron gun
assembly are the most vulnerable part of the klystron. Especially the filament terminal at the
bottom center of the tube is very weak to break and must not be shocked at any time. Placing the
klystron on its electron gun assembly may cause a perfect damage to the tube and must be
avoided. Be careful not to apply any pressure on the electron gun assembly, output waveguides,
ion pump assembly, and copper pipings of cooling channels.
6.1.3. Installing the klystron
6.1.3.1. Install the electromagnet
Before placing them, check the spring contact rods of the socket be properly positioned. Put
six guiding rods of the electromagnet into every two threads of 12 threads in total, which are
threaded at the pitched circle diameter of 500mm on the top plate of the oil tank. Be sure that a
sealing elastic[ O-ring type:“AS 465(ARP465)” to be prepared by an equipment manufacturer ]
is securely engaged in place. Place the electromagnet on the oil-tank. Fasten six bolts with the
clamps into the threads between guiding rods to the oil tank.
6.1.3.2. Install the klystron into the electromagnet
Lift up the klystron with the lifting device in vertical position, the electron gun should be in the
bottom. Be sure the klystron is not tilted and is located just on the center of the electromagnet
when lifted. Remove plastic cover of the electron gun seal. Check the sealing elastic around the
electron gun housing is properly employed in place. Install the klystron into the electromagnet so
that the cut-away of the electromagnet may properly correspond the klystron output waveguide.
Fasten the X-ray shielding jacket and the electromagnet with six M12 hexagon-head bolts of
stainless steel.
6.1.3.3. Ground the klystron and the electromagnet
Ground the klystron and the electromagnet with wires to the oil-tank, unless the electrical
connection through the flange is sufficient. The oil-tank must be properly grounded and must be
connected to the modulator so as to close the klystron high voltage returning loop.
6.1.3.4. Fill the oil tank with oil
Fill the oil tank with certified insulation oil which has sufficient dielectric strength more than
50kV/2.5mm. Be sure the oil level is within the specified range.
6.1.3.5. De-gas oil tank
Usually insulation oil contains a little amount of volatile component that may produce
bubbles by temperature rise during klystron operation.
Evacuate inside of the oil tank in order to reduce the residual volatile components dissolved
in the oil, to ensure the expected dielectric strength. The oil must be evacuated down to 1mmHg or
lower pressure until no visible bubbles come up.