Amplifying klystron KIU-268

Amplifying klystron KIU-268

The Klystron K-268 is designed to feed linear accelerators for industrial, scientific and medical use. The design of the klystron allows placing it in either vertical or horizontal position for operation. The construction is stacked/metal-ceramic with focusing system on constant magnets. Energy input is coaxial and output is a waveguide with 40x20 mm section.

2856 ± 2 MHz
6 MW/6 kW

Operating Specifications
Operating frequency, MHz 2856 ± 4
Max. output pulse power at any phase of load, MW, not less than
for frequency range 2856 ± 2 6.0
for frequency range 2856 ± 4 5.5
Min. output pulse power at any phase of load, MW, not more than
(Output pulse power is adjusted by changing beam voltage)
3.0
Average output pulse power, kW, not less than 25.0
Supplied pulse power, MW, not more than 15
Supplied average power, kW, not more than 62.5
Efficiency at saturation mode, %, not less than 42
Filament power, W, not more than 650
Modulating pulse length, μs 7.0 – 16.0
Duty cycle, approx. 0,00416
Cathode pulse voltage, kV, not more than 55
Filament voltage, V, not more than 24
Ion pump voltage, kV 4.0 ± 0.5
Beam pulse current, A, not more than 300
Filament current, A, not more than 30
Ion pump current, μA, not more than 50
Input pulse power, W, not more than 70
Gain, dB, not less than 50
Standing wave ratio (Load SWR), not more than 1.25
Design specifications
Design of klystron - packaged with permanent magnets.
Length of klystron, not more than 900 mm
Max. dimension of klystron's body in plane which is perpendicular to
klystron's axis, except input, output and mounting flange, not more than
270 mm
Overhang of output with respect to klystron's axis, not more than 400 mm
Weight of klystron with permanent magnets, not more than 90 kg
Operation position arbitrary
Energy input/output – waveguide (see flange drawing below)
Cooling - fluid, forced; refrigerating fluid - water, two cooling channels: collector, resonator unit
Water rate, l/min, not more than
- in collector 80
- in resonator unit 20
Pressure differential at minimum flow rate, atm., not more than 3
Max operation pressure in output waveguide, atm. 6
Filament voltage source
Filament voltage - direct or alternating with frequency value up to …, Hz 100
Acceptable longtime voltage instability, not more than Uf nom. ± 3%
Voltage adjustment (operating RMS value) within the limits…, V 5 - 25
Filament source power, W, not less than 700
Cathode voltage source
Pulse amplitude (in negative) - adjustable, kV 20 - 55
Acceptable longtime voltage instability, not more than Ub nom. ± 1.5%
Pulse top flatness variation, not more than 10%
Voltage pulse length, μs, not less than 5
Voltage pulse length, μs, not more than 16
Length of pulse edge and droop of pulse (for level 0.1 - 0.9 of amplitude), μs, not more than 1.0
Ion pump power supply
Source voltage – direct, not adjustable
Ion pump supply voltage (in positive), kV 4 ± 0.5
Short circuit current of source, mA 0.5 – 1.0
Pulse input power source
Carrier frequency of the input signal, MHz 2856 ± 4
Adjustable pulse power, W 2 – 70
Acceptable longtime instability of pulse power value Pin nom. ± 10%
Excess of input signal pulse envelope length above cathode voltage pulse length from each side, μs, not less than 0.5
Total variation of the flat part of the input signal pulse envelope, %, not more than 10
Input signal source shall maintain the above listed characteristics at klystron input VSWR to …, relative unit 30
Source output VSWR, relative unit, not more than 1.3
Safety – important!
Ferromagnetic materials shall not be located closer than 100 mm from the klystron being in the process of operation
It is prohibited to feed klystron if output waveguide system is not connected to klystron as well as when cooling is not switched on.
Klystron shall be placed in room or compartment, protecting the personnel from X-ray radiation, the sources of which the collector and the klystron's body are.

Note: it is now possible to manufacture klystrons based on customer requirements and specifications, so please, feel free to submit your terms of reference and we will manage to design and manufacture the best klystron for your needs.