Sodium atom distribution within a heat sandwich oven

Cappelli, Mark A.; Cardinal, P. G.; Herchen, H.; Measures, Raymond M.

doi:10.1063/1.1138413

Cited by 11 publications

(2 citation statements)

References 19 publications

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“…al. 10,11 , has been developed in order to measure and further analyze the Bi spectrum before putting the diagnostics to use on an actual thruster. The apparatus consists of an electrically heated metal mesh inside a small vacuum chamber.…”

Section: Measurements Of Bi Spectrummentioning

confidence: 99%

Spectroscopic Measurement of Bismuth for Optical Diagnostics

Scharfe¹

2005

41st AIAA/ASME/SAE/ASEE Joint Propulsion Conference &Amp;amp; Exhibit

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Bismuth has received considerable attention recently as a propellant option for more advanced, next-generation Hall thrusters. A bismuth-fueled Hall thruster would possess advantages over conventional xenon thrusters in terms of efficiency, power-handling, and simplicity of ground testing facilities. In developing such a thruster, there is a need for nonintrusive diagnostic methods for taking the necessary measurements to optimize the geometry and operating conditions. A previous paper discussed such optical diagnostic methods for analyzing the velocity, energy, and number densities of BiI and BiII in the plume. Additionally, candidate transitions for measurement were selected and their lineshapes modeled in terms of hyperfine splitting and broadening mechanisms. In this paper, after a brief summary of the previous work, the line selections will be revised for improved accessibility to commercial tunable diode lasers. A lineshape model that more closely relates to Hall thruster measurements will also be discussed. Finally, the development of laboratory systems for taking measurements on a Bi gas will be discussed, and measurements of the Bi spectrum will be presented.

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Section: Measurements Of Bi Spectrummentioning

confidence: 99%

Spectroscopic Measurement of Bismuth for Optical Diagnostics

Scharfe¹

2005

41st AIAA/ASME/SAE/ASEE Joint Propulsion Conference &Amp;amp; Exhibit

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“…A bismuth heat pipe apparatus, based on the design of Cappelli, et al 1,2 and illustrated in Fig. 1 has been developed to produce and analyze a bismuth plasma.…”

Section: Bismuth Heat Pipe Apparatusmentioning

confidence: 99%

Measurements in Stationary Reference Bi Discharge Cell for Diagnostics of a Bismuth Hall Thruster

Scharfe¹,

Ito²,

Cappelli³

2006

42nd AIAA/ASME/SAE/ASEE Joint Propulsion Conference &Amp;amp; Exhibit

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As development continues on the production of bismuth fueled Hall thrusters, there is a need for an accurate understanding of the nature of bismuth plasma. This includes both the ability to predict the electrical breakdown characteristics of a bismuth gas, as well as the design of tools necessary to make diagnostic measurements on a bismuth-fed electric thruster. A bismuth heat pipe apparatus capable of igniting an electrical discharge in a bismuth gas has been constructed for the purposes of such analysis. This paper will discuss the progress of using this chamber for preparing optical diagnostic techniques in a bismuth plasma, as well as measured current-voltage and Paschen curves for a bismuth gas mixed with Argon. While ion populations in the heat pipe are not yet strong enough to produce a measurable absorption or laser-induced fluorescence signal on the Bi II transition selected for thruster performance analysis, we have recorded significant effects on the electrical behavior of the argon gas due to the presence of bismuth vapor. Nomenclature

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