The Klystron K-273 is designed to feed linear accelerators for industrial, scientific and medical use.

The design of the klystron allows placing it either in vertical or in horizontal position for operation. The construction is stacked/metal-ceramic with focusing system on constant magnets. Energy input and output is a waveguide with 40x20 mm section.

Operating Specifications
Operating frequency, MHz	5712 ± 4
Max. output pulse power at any phase of load, MW, not less than	3.0
Min. output pulse power at any phase of load, MW, not more than	1.0
Average output pulse power, kW, not less than	6.0
Supplied pulse power, MW, not more than	7.7
Supplied average power, kW, not more than	15
Efficiency at saturation mode, %, not less than	45
Filament power, W, not more than	420
Modulating pulse length, μs	3 – 7.0
Duty cycle, approx.	0,0020
Cathode pulse voltage, kV, not more than	45
Filament voltage, V, not more than	16
Ion pump voltage, kV	4.0 ± 0.5
Beam pulse current, A, not more than	160
Filament current, A, not more than	30
Ion pump current, mA, not more than	1
Input pulse power, W, not more than	30
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	640 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	260 mm
Overhang of output with respect to klystron's axis, not more than	365 mm
Weight of klystron with focusing system, not more than	65 kg
Operation position	arbitrary
Energy input/output – waveguide (see flange drawing below)
Cooling - fluid, forced; liquid - water, two cooling channels: collector, resonator unit
Water rate, l/min, not more than
- in collector	26
- in resonator unit	8
Pressure differential at minimum flow rate, atm., not more than	2
Max operation pressure in output waveguide, atm.	3

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 - 16
Filament source power, W, not less than	420

Cathode voltage source
Pulse amplitude (in negative) - adjustable, kV	30 - 50
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	3
Voltage pulse length, μs, not more than	7
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	5712 ± 4
Adjustable pulse power, W	2 – 30
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.