Field Emission Cathodes
Download the Field Emission Cathodes Sheet (4.1 MB PDF).
Busek’s Field Emission Cathodes use in-house synthesized multi-wall carbon nanotubes (CNTs) as field emission sites. Field emission cathodes applied to electric propulsion (EP) as neutralizers have one significant advantage over hollow cathodes: they do not consume propellant. Hence they are ideal for low power, low beam current EP such as colloid or FEEP thrusters as well as space tether applications. Busek has developed the CNT field emission cathode as a neutralizer for colloid thrusters that will provide propulsion on the JPL, Space Technology 7/Disturbance Reduction System mission. In addition to space, our rugged CNT cathodes have multiple terrestrial applications. The CNT cathodes have an integrated extraction grid, forming a complete package.
Cathode Constant-Current
Lifetime Tests
Current: Lifetime
0.1 mA: 13,236 hours
1.0 mA: 6,433 hours
CNT Field Emission Cathodes do not require an ultra high vacuum (UHV) environment and can be operated in an oxygen environment; UV light has a negligible effect on emission.
Standard half-inch cathode
T05 Package
⇒ Nominal half-inch design
⇒ Fully flight qualified for ST7-DRS
⇒ Mission Output current 1 mA
⇒ Design with standard TO5 package available
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