E3730A OPERATING INSTRUCTIONS
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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
See outline drawing
Weight
Approx. 140 kg (without the X-ray shielding kit)
Mounting position
Vertical, cathode down
Cooling
Liquid water
4.3.2 Connections
RF input connector
Type “N” 50 ohms coaxial; UG-22D/U compatible
Output waveguide
WR-284
RF output flange
SLAC Rectangular type female
Ion pump
HN-R, UG-61B/U compatible
Filament/Cathode
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.
Cooling water
Collector and Body
NITTO KOHKI "SP-type COUPLER"
"4P" for the inlet, "4S" for the outlet
Waveguide
1/4 inch Swagelok
4.3.3 Electrical characteristics
Frequency
2856 MHz
Pulse width (RF)
4.0
µ
s
Peak RF output power
50 MW
Average RF output power
10 kW
Peak forward beam voltage
325 kV
Peak cathode current
400 A
