E3730A OPERATING INSTRUCTIONS
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c. RF pulse
Measure peak power of the input RF pulse, peak power of the output RF pulse and pulse width of the input
and output RF pulse.
d. Vacuum
Measure current of the ion pump.
e. Vacuum degree in the waveguide
Measure pressure in the output waveguide.
5.2.4 Load condition
Evacuate the output waveguide to a good vacuum. The voltage standing wave ratio (VSWR) must be less
than 1.4
:
1. A Protection interlock which detects discharge or reflection power and stop inputting RF power or
applying the high voltage is necessary to prevent the VSWR from exceeding 1.4
:
1. Output power of the
klystron is measured under the condition of the VSWR with 1.2
:
1 or less at the factory test.
5.2.5 Oil tank
The electron gun section must be operated in insulating oil with insulation voltage of 30kV/2.5mm or more.
Be sure that oil level exceeds the regulated level.
5.2.6 Cooling
The cooling circuits are two (2) for the tube and they cool the collector, the body. Coolant shall be LCW
(Low Conductivity Water). When coolant flow is less than the regulated value, the interlock should stop
applying the high voltage and the heater voltage. If there is a risk of freezing, drain the coolant. Please follow
the following ratings about cooling the klystron tube and the focusing magnet. Cool the output waveguide if
necessary.
Collector
Waveguide
Focusing magnet
Coolant flow min.
30 L/min.
2 L/min. 10 L/min.
Coolant temperature max.
40 degrees
40 degrees
40 degrees
Coolant pressure max.
0.98 MPa 0.98 MPa
0.98 MPa
The coolant water requires the following quality.
pH factor
7 - 9
Dissolved oxygen
max. 1 - 6 ppm
Resistivity
min. 10 k
Ω
-cm
Particle-matter size
max. 50
µ
m (325 mesh)
5.3 Operating hazards
E3730A is a klystron operated with high output power and high voltage. Therefore, please note the following
points for safety and protection of the tube.
5.3.1 High voltage
This tube operates at high voltage. So that, equipments, electromagnet and klystron must be designed so
that personnel cannot come in contact with operation voltages.
5.3.2 X-ray radiation
Operating personnel must be protected by appropriate X-ray radiation shielding. Adequate X-ray shielding
should be installed for this tube. X-ray signs or labels must be permanently attached on the equipment to
notify operating personnel never to operate this device without X-ray shielding in place.
5.3.3 Microwave radiation
Exposure of the human body to microwave radiation in excess of 1mW per square centimeter is unsafe
