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4.2 Outline of the design
This klystron tube consists of following sections.
a. Electron gun section
The electron gun section consists of a cathode electrode, an anode electrode, and an insulating ceramic.
An impregnated cathode (Iridium-coated M-type dispenser cathode) is adopted for E3730A.
b. RF interaction section
The RF interaction section consists of five resonant cavities and a drift tube. The cavities and the drift tube
are cooled by water.
c. Collector
The collector is cooled by water.
d. RF Output section
The RF output section consists of an output waveguide and a pillbox type output window made from
alumina ceramic.
e. Ion pump
The ion pump keeps high vacuum degree in the klystron tube.
4.3 Characteristics of the tube
E3730A is a high-power pulsed klystron especially designed to be used as a high-power microwave source
for a linear accelerator. E3730A can deliver peak output power of 50 MW with a pulse width of 4.0
micro-seconds at frequency of 2856MHz. The focusing magnet of VT-68922 is available.
4.3.1 Mechanical characteristics
Dimensions
Weight
Mounting position
Cooling
4.3.2 Connections
RF input connector
Output waveguide
RF output flange
Ion pump
Filament/Cathode
Cooling water
Collector and Body
Waveguide
4.3.3 Electrical characteristics
Frequency
Pulse width (RF)
Peak RF output power
Average RF output power
Peak forward beam voltage
Peak cathode current
E3730A OPERATING INSTRUCTIONS
See outline drawing
Approx. 140 kg (without the X-ray shielding kit)
Vertical, cathode down
Liquid water
Type "N" 50 ohms coaxial; UG-22D/U compatible
WR-284
SLAC Rectangular type female
HN-R, UG-61B/U compatible
Heater-Cathode (HK) and Heater(H) Terminals of
the bottom of Electron Gun
Spring Contact Rods with a pad of Monel
meshed wire are available for a socket.
NITTO KOHKI "SP-type COUPLER"
"4P" for the inlet, "4S" for the outlet
1/4 inch Swagelok
2856 MHz
4.0 µs
50 MW
10 kW
325 kV
400 A
－ 10 －
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