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Development and characterization of ...

Hofer, Richard Robert.

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Development and characterization of high-efficiency, high-specific impulse xenon Hall thrusters.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Development and characterization of high-efficiency, high-specific impulse xenon Hall thrusters./
Author:	Hofer, Richard Robert.
Description:	358 p.
Notes:	Source: Dissertation Abstracts International, Volume: 65-02, Section: B, page: 0858.
Contained By:	Dissertation Abstracts International65-02B.
Subject:	Engineering, Aerospace. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3121942

Development and characterization of high-efficiency, high-specific impulse xenon Hall thrusters.
Hofer, Richard Robert.

Development and characterization of high-efficiency, high-specific impulse xenon Hall thrusters. - 358 p.

Source: Dissertation Abstracts International, Volume: 65-02, Section: B, page: 0858.

Thesis (Ph.D.)--University of Michigan, 2004.

This dissertation presents research aimed at extending the efficient operation of 1600 s specific impulse Hall thruster technology to the 2000--3000 s range. While recent studies of commercially developed Hall thrusters demonstrated greater than 4000 s specific impulse, maximum efficiency occurred at less than 3000 s. It was hypothesized that the efficiency maximum resulted as a consequence of modern magnetic field designs, optimized for 1600 s, which were unsuitable at high-specific impulse. Motivated by the industry efforts and mission studies, the aim of this research was to develop and characterize xenon Hall thrusters capable of both high-specific impulse and high-efficiency operation. The research divided into development and characterization phases.Subjects--Topical Terms:

1018395
Engineering, Aerospace.

Development and characterization of high-efficiency, high-specific impulse xenon Hall thrusters.
LDR:03376nmm 2200301 4500 001 1810925
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008 130614s2004 eng d
035 $a (UnM)AAI3121942
035 $a AAI3121942
040 $a UnM $c UnM
100 1 $a Hofer, Richard Robert. $3 1900517
245 1 0 $a Development and characterization of high-efficiency, high-specific impulse xenon Hall thrusters.
300 $a 358 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-02, Section: B, page: 0858.
500 $a Chair: Alec D. Gallimore.
502 $a Thesis (Ph.D.)--University of Michigan, 2004.
520 $a This dissertation presents research aimed at extending the efficient operation of 1600 s specific impulse Hall thruster technology to the 2000--3000 s range. While recent studies of commercially developed Hall thrusters demonstrated greater than 4000 s specific impulse, maximum efficiency occurred at less than 3000 s. It was hypothesized that the efficiency maximum resulted as a consequence of modern magnetic field designs, optimized for 1600 s, which were unsuitable at high-specific impulse. Motivated by the industry efforts and mission studies, the aim of this research was to develop and characterize xenon Hall thrusters capable of both high-specific impulse and high-efficiency operation. The research divided into development and characterization phases.
520 $a During the development phase, the laboratory-model NASA-173M Hall thrusters were designed with plasma lens magnetic field topographies and their performance and plasma characteristics were evaluated. Experiments with the NASA-173M version 1 (v1) validated the plasma lens design by showing how changing the magnetic field topography at high-specific impulse improved efficiency. Experiments with the NASA-173M version 2 (v2) showed there was a minimum current density and optimum magnetic field topography at which efficiency monotonically increased with voltage. Between 300--1000 V, total specific impulse and total efficiency of the NASA-173Mv2 operating at 10 mg/s ranged from 1600--3400 s and 51--61%, respectively. Comparison of the thrusters showed that efficiency can be optimized for specific impulse by varying the plasma lens design.
520 $a During the characterization phase, additional plasma properties of the NASA-173Mv2 were measured and a performance model was derived accounting for a multiply-charged, partially-ionized plasma. Results from the model based on experimental data showed how efficient operation at high-specific impulse was enabled through regulation of the electron current with the magnetic field. The decrease of efficiency due to multiply-charged ions was minor. Efficiency was largely determined by the current utilization, which suggested maximum Hall thruster efficiency has yet to be reached. The electron Hall parameter was approximately constant with voltage, decreasing from an average of 210 at 300 V to an average of 160 between 400--900 V, which confirmed efficient operation can be realized only over a limited range of Hall parameters.
590 $a School code: 0127.
650 4 $a Engineering, Aerospace. $3 1018395
650 4 $a Physics, Fluid and Plasma. $3 1018402
650 4 $a Physics, Electricity and Magnetism. $3 1019535
690 $a 0538
690 $a 0759
690 $a 0607
710 2 0 $a University of Michigan. $3 777416
773 0 $t Dissertation Abstracts International $g 65-02B.
790 1 0 $a Gallimore, Alec D., $e advisor
790 $a 0127
791 $a Ph.D.
792 $a 2004
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3121942