Reservoir Cathode for Electric Space Propulsion

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$599,827.00
Award Year:
2012
Program:
SBIR
Phase:
Phase II
Contract:
NNX12CA54C
Award Id:
n/a
Agency Tracking Number:
104137
Solicitation Year:
2010
Solicitation Topic Code:
X2.04
Solicitation Number:
n/a
Small Business Information
OR, Beaverton, OR, 97007-8739
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
192000149
Principal Investigator:
Bernard Vancil
Principal Investigator
(503) 628-0703
bernie@ebeaminc.com
Business Contact:
Bernard Vancil
Business Official
(503) 628-0703
bernie@ebeaminc.com
Research Institution:
Stub




Abstract
We propose a hollow reservoir cathode to improve performance in ion and Hall thrusters. We will adapt our existing reservoir cathode technology to this purpose. Reservoir cathodes are the only emission sources that are capable of supplying the necessary current density (>5.0 A/cm2) and life (>100,000 hours) for next generation high-power thrusters. More powerful thrusters are needed for interplanetary and lunar missions, as well as earth escape and near-earth space maneuvers. Reservoir cathodes are able to sustain high rates of barium diffusion to the cathode surface to overcome the high rate of barium removal in ion engines. The key Phase I innovation was flexible supports for the cathode matrix. This prevented the matrix fractures and reservoir leaks of previous reservoir cathodes for ion engines. Cathode operation and stability was verified. In Phase II,the design is refined and tested in actual ion engines.The key challenge is the stresses exerted on the cathode tube and reservoir due to differential expansion and large temperature excursions. These originate from the outside heater and also from heating due to collisions with the cathode. These stresses can lead to fractures and weld failure. Our innovation solves this problem. This was proven on the Phase I device.In Phase II we further test and optimize the Phase I device and perform life testing on it. We build cathode assemblies for insertion into ion engines which we test in an ion environment at e beam, JPL and Colorado State University. Their maximum specific impulse will be measured.

* information listed above is at the time of submission.

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