Variable-Isp Ionic Liquid Electrospray Thruster

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: FA9550-09-C-0179
Agency Tracking Number: F08B-T09-0203
Amount: $99,997.00
Phase: Phase I
Program: STTR
Awards Year: 2009
Solicitation Year: 2008
Solicitation Topic Code: AF08-BT09
Solicitation Number: 2008.B
Small Business Information
Busek Co. Inc.
11 Tech Circle, Natick, MA, 01760
DUNS: 184629491
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Douglas Spence
 Director, Micropropulsion
 (508) 655-5565
 doug@busek.com
Business Contact
 Judy Budny
Title: Contracts Administrator
Phone: (508) 655-5565
Email: judy@busek.com
Research Institution
 Massachusetts Institute of Tech.
 Michael P Corcoran
 77 Massachusetts Avenue
Cambridge, MA, 2139
 (617) 253-3906
 Domestic nonprofit research organization
Abstract
Busek proposes, with the MIT Space Propulsion Lab, to develop and characterize a variable-Isp colloid thruster operating only in the ionic mode and achieving its variable-Isp through use of a deceleration grid.  This approach overcomes the usual inefficiencies encountered in variable-Isp colloid thruster operation, where lower Isp is accomplished through operation in droplet or mixed droplet/ion modes.  An additional benefit is that the variable-Isp operation can be obtained under constant power.  For the Phase 1 effort, the Busek/MIT team shall develop a linear emitter using photolithographic mask transfer and electrochemical etching on porous tungsten substrates.  The emitter will subsequently be operated to determine V-I characteristics, verify ion emission and the decelerator concept, and perform time-of-flight measurements.  Following these tests, direct thrust measurements shall be performed on Buseks magnetically levitated thrust stand to obtain direct thrust and Isp measurements.  The linear emitter architecture will be designed in order to be suitable for multiplexing into thruster units able to provide greater thrust levels.  Subsequent Phase 2 work would be to multiplex emitters and develop a deliverable 1mN class thruster with variable Isp of 500-5000 seconds. BENEFIT: Features of the proposed effort are: a colloid thruster able to operate only in ionic mode; variable Isp operation spanning 500-5000 seconds; and constant power operation.  The benefit of pure ionic operation is that it avoids the inefficiencies of mixed-mode (droplet + ion) operation.  Variable Isp provides versatility in a single thruster system, allowing for operations such as highly mass-efficient station-keeping as well as rapid maneuver that would otherwise require multiple systems.  Constant power operation allows for simplification of power electronics design as well as reduced demands on the spacecraft bus, where variable power thrusters complicate power allocation and margin requirements.)

* information listed above is at the time of submission.

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