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Recombination processes in a flowing...

Chavers, Donald Gregory.

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Recombination processes in a flowing magnetized plasma: Application to ionization energy recovery in the variable specific impulse magnetoplasma rocket (VASIMR).

Record Type:	Electronic resources : Monograph/item
Title/Author:	Recombination processes in a flowing magnetized plasma: Application to ionization energy recovery in the variable specific impulse magnetoplasma rocket (VASIMR)./
Author:	Chavers, Donald Gregory.
Description:	188 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-02, Section: B, page: 0783.
Contained By:	Dissertation Abstracts International64-02B.
Subject:	Physics, Fluid and Plasma. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3079373

Recombination processes in a flowing magnetized plasma: Application to ionization energy recovery in the variable specific impulse magnetoplasma rocket (VASIMR).
Chavers, Donald Gregory.

Recombination processes in a flowing magnetized plasma: Application to ionization energy recovery in the variable specific impulse magnetoplasma rocket (VASIMR). - 188 p.

Source: Dissertation Abstracts International, Volume: 64-02, Section: B, page: 0783.

Thesis (Ph.D.)--The University of Alabama in Huntsville, 2003.

Electric propulsion involves the acceleration of charged particles (ions and electrons) through electric and magnetic body forces. The collection of these charged particles, or plasma, cannot be stored but must be created in-situ. Therefore, energy must be supplied to a neutral gas to create the plasma that is accelerated by the body forces. The energy that is used to create the plasma, i.e., ionization energy, is typically lost, “frozen” in the exhaust of the thruster. When the kinetic energy in the plasma flow is much larger than the energy used to create the plasma, this frozen-flow loss is negligible. Conversely, if the frozen-flow loss is a major fraction of the total plasma energy, its recovery, even in a partial way, may improve the energy efficiency of the thruster while also providing a potential means for thrust augmentation. This dissertation investigates the underlying physics, which could enable the practical recovery of frozen-flow losses by processes such as surface and volume recombination.Subjects--Topical Terms:

1018402
Physics, Fluid and Plasma.

Recombination processes in a flowing magnetized plasma: Application to ionization energy recovery in the variable specific impulse magnetoplasma rocket (VASIMR).
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035 $a (UnM)AAI3079373
035 $a AAI3079373
040 $a UnM $c UnM
100 1 $a Chavers, Donald Gregory. $3 1899878
245 1 0 $a Recombination processes in a flowing magnetized plasma: Application to ionization energy recovery in the variable specific impulse magnetoplasma rocket (VASIMR).
300 $a 188 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-02, Section: B, page: 0783.
500 $a Adviser: James Miller.
502 $a Thesis (Ph.D.)--The University of Alabama in Huntsville, 2003.
520 $a Electric propulsion involves the acceleration of charged particles (ions and electrons) through electric and magnetic body forces. The collection of these charged particles, or plasma, cannot be stored but must be created in-situ. Therefore, energy must be supplied to a neutral gas to create the plasma that is accelerated by the body forces. The energy that is used to create the plasma, i.e., ionization energy, is typically lost, “frozen” in the exhaust of the thruster. When the kinetic energy in the plasma flow is much larger than the energy used to create the plasma, this frozen-flow loss is negligible. Conversely, if the frozen-flow loss is a major fraction of the total plasma energy, its recovery, even in a partial way, may improve the energy efficiency of the thruster while also providing a potential means for thrust augmentation. This dissertation investigates the underlying physics, which could enable the practical recovery of frozen-flow losses by processes such as surface and volume recombination.
520 $a For surface recombination, the ions approach the surface of the metal and are neutralized by electrons from the metal via the Auger neutralization process. For volume recombination, the ions and electrons recombine, with energy released via line radiation or by transferring energy to a third body such as another electron. Since the total energy of the neutralized ion, an atom, is less than the total energy of the ion and electron pair before recombination, conservation of energy requires the release of energy as the ion and electron recombine.
520 $a The measurements described in this dissertation were performed on the VX-10 experiment, a plasma device supporting the development of the Variable Specific Impulse Magnetoplasma Rocket (VASIMR) concept and located at the Advanced Space Propulsion Laboratory of the Johnson Space Center. Results suggest that the recombination energy can be recovered. The available energy and power recovered depends on the local plasma conditions at the axial location of interest, rather than on conditions at the plasma source. Also, experimental data with neutral gas injection indicates that the extracted power can be used for thrust augmentation, alas, at the expense of specific impulse. The neutralization of the exhaust jet can also be useful in producing efficient plasma detachment from the magnetic nozzle, thereby alleviating the concern for plasma detachment from the magnetic field for these operating regimes.
590 $a School code: 0278.
650 4 $a Physics, Fluid and Plasma. $3 1018402
650 4 $a Engineering, Aerospace. $3 1018395
690 $a 0759
690 $a 0538
710 2 0 $a The University of Alabama in Huntsville. $3 1017884
773 0 $t Dissertation Abstracts International $g 64-02B.
790 1 0 $a Miller, James, $e advisor
790 $a 0278
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3079373