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Laser plasma thruster
Authors:Luke  JR  Phipps  CR  McDuff  GG
Institution:(1) Institute for Engineering Research and Applications, New Mexico Institute of Mining and Technology, 901 University Blvd. SE, Albuquerque, NM 87 106-4339, USA, US;(2) Photonic Associates, 200A Ojo de la Vaca Road, Santa Fe, NM 87 505, USA, US
Abstract:The laser plasma thruster (LPT) is a new microthruster for small satellites. We report on development and testing of a prototype LPT. Some advantages of the LPT are: thruster voltage 4 V, mass less than 1 kg, power-to-thrust ratio 10 kW/N, and Isp up to 1000 s. Typical thrust level is 250 μN with PVC fuel. Thrust of 1 mN is expected with energetic fuel. The pre-prototype continuous-thrust experiment includes the laser mount and heat sink, lens mounts, and focusing mechanism, which are coupled to the target-material transport mechanism. The target material is applied to a transparent plastic tape, and the laser is focused on a series of tracks on the tape. The tape-drive hardware and laser-drive electronics are described. Design, construction, and calibration of the thrust stand are described. During continuous operation, the exhaust plume is deflected in the direction of the moving tape. When the laser is operated in pulsed mode, the exhaust plume is perpendicular to the tape (parallel to the optical axis). This provides some thrust-vector control. Measured thrust is 70 μN with PVC fuel, and 550 μN with energetic fuel, with a specific impulse of 350 s. Received: 7 October 2002 / Accepted: 20 January 2003 / Published online: 28 May 2003 RID="*" ID="*"Corresponding author. Fax: +1-505-272-7203, E-mail: luke@iera.nmt.edu
Keywords:PACS: 52  38  Mf  52  75  Di  52  50  Jm  95  40  +s  42  55  Px
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