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Electromagnet temperature
3.2.4. Shutting down
When shutting down the equipment, it is necessary to leave the coolant flowing in the
focusing magnet cooling system. Otherwise, let the focus coils cool down before stopping the flow
of cooling water.
3.3. Maintenance
The non-observation of these maintenance instructions can cause the manufacturer's
guarantee to become null and void in the case of an irremediably fault of the klystron.
3.3.1. Periodically check
That the dielectric strength of the insulating oil is at least 50kV/2.5mm.
That the cooling water is sufficiently clean : Check the quality of the cooling water.
3.3.2. Shut down for a long period of time
If the equipment is shut down for a long period of time, make sure that the cooling water
remaining in the tube or in the focus coils is not likely to freeze. Otherwise, or if the tube is to be
stored, the water circuit should be drained and dried, if possible, by means of a jet of compressed
air, injected successively at the inlet and outlet of the cooling-water circuit. In case the output
waveguide is opened to air, clean and dry nitrogen gas must be inlet to the waveguide before the
waveguide is opened to air. In case the klystron output waveguide is exposed to air for hours, the
protecting cover and sealing elastic must be fastened to the output waveguide, and the air inside
the waveguide must be replaced with clean and dry nitrogen gas. The pressure inside the
waveguide must not exceed 0.02MPa (0.2kgf/cm
windows. This operation is very important for maintaining the delicate surface of the output window
ceramics.
3.4. Storage
When in storage, it is recommended to store the klystron in the double crates in which
klystron has been freighted. For a short period, it is possible to stand the klystron on a service cart
or a platform. The klystron must be supported at the collector shielding bracket or the collector
pole-piece in vertical position. Placing the klystron on its electron gun assembly may cause a
perfect damage to the tube and must be avoided.
The water circuit should be drained and dried, if possible, by means of a jet of compressed
air, injected successively at the inlet and outlet of the cooling-water circuit.
The protecting cover and the sealing elastic must be fastened to the output waveguide, and
the air inside the waveguide must be replaced with clean and dry nitrogen gas. The pressure inside
the waveguide must not exceed0.02MPa (0.2kgf/cm
windows. This operation is very important for maintaining the delicate surface of the output window
In case of SF
gas pressurization, make sure the pressure
6
gauge is in normal operation range.
Check the electromagnet water flow is in normal range. Check
the focus coil current is in normal operation range.
2
) by gauge to avoid damage to the output
2
) by gauge to avoid damage to the output
－ 22 －
E3730A OPERATING INSTRUCTIONS
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