013-033-keidar - As the name suggests, nanosatellites and microsatellites are significantly
smaller and lighter than traditional satellites (between 1 kg and 100kg). With
this shrinkage, the demands for alternative propulsion systems as well as
maximum fuel efficiency are extremely important. Pulse plasma metal electrode micro-arc
cathode thrusters (µCAT) have emerged as a good alternative to chemical
propulsion systems. Pulse plasma
micro-cathode thrusters use small bursts of electrical current to generate a
plasma arc jet which propel the object forward. Plasma generation, however,
results in gradual depletion of the cathode involved in the plasma burst
formation, while the anode remains unused. Researchers at the George Washington University have developed an
alternating electrode micro-cathode thruster (AE-µCAT) which utilizes two
different electrode materials which can alternate as cathodes and anodes. This
extends the lifetime of the thruster as well as provides varying burst lengths
(impulse-bits) to better control the satellite. Applications:
·
Deep space exploration
·
Fine control of nano/micro satellites
·
Personal or near earth nano/micro satellites
Advantages:
·
Longer life for micro-cathode thrusters (Up
twice as long)
·
Alternating electrodes provide two types of
plasma bursts instead of one in the conventional design
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