The Top Hat Electric Propulsion Plume Analyzer (TOPAZ): Preliminary Data on the BHT600 Cluster

Victor, Allen L.; Zurbuchen, T. H.; Gallimore, Alec D.

doi:10.2514/6.2005-3870

Cited by 1 publication

(3 citation statements)

References 15 publications

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“…The CEM operates by allowing ions to strike a ceramic surface with a high secondary electron emission rate. A voltage of -1500 to -2500 V is placed over a distance of 3.8 cm which induces secondary electron multiplication within the CEM, and the signal is amplified by approximately 5x10 7 . After an ion flies into the CEM, a pulse is created due to the avalanche of secondary electrons emitted.…”

Section: A Experimental Setupmentioning

confidence: 99%

“…Guiding and deflection plate potentials are converted into an elevation angle and energy-percharge through voltage relationships previously characterized, 7 while the azimuthal angle is directly measured. A conversion from spherical to Cartesian coordinates of energy-per-charge, mass-per-charge, elevation angle, and azimuthal angle reveals the velocity distribution profile within the field of view for each of the charge states measured.…”

Section: B Proceduresmentioning

confidence: 99%

“…Ions emanating from near the cathode tend to have slightly lower energies than those from other parts of the cluster. 7 The aim of this study is to ascertain the individual relationships of the multiple charge states of the propellant with the energy-angle correlation.…”

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confidence: 99%

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Far-Field Species Distribution Measurements on the BHT-600 Hall Thruster Cluster

Victor¹,

Gallimore²,

Zurbuchen³

2007

43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference &Amp;amp; Exhibit

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Measurements via the Top Hat Electric Propulsion Plume Analyzer (TOPAZ) on theBusek BHT-600 Hall thruster cluster are presented. TOPAZ incorporates a 'top hat' design with an analyzer constant of 100 resulting in a wide energy-range capability and high angular and energy resolutions. A time-of-flight analyzer is also incorporated for mass-tocharge (and hence charge-state) discrimination from within the plume. Energy profiles measured from different regions of the cluster revealed lower-energy (i.e., energies significantly below the discharge voltage) ions emanating from positions closer to the cathode, while higher-energy (i.e., energies near or higher than the discharge voltage) ions were measured along the discharge channel centerlines. Low-energy ions were also measured from behind the cathodes only during cluster operation indicating a possible cross-pollination of the cathode plume with the opposite thruster. Multiply-charged xenon ions (i.e., Xe 3+ and Xe 4+) were measured for 0° and 10° plume angles while the 20° plume angle revealed mostly singly-and doubly-charged xenon. Calculations of the axial and radial velocity distributions for the first three charge-states downstream of the cluster centerline revealed a symmetric triple-peak structure in the radial velocity distributions and a doublepeak profile in the axial velocity distribution of the first charge-state of xenon. I. Nomenclature= deflection plate gap radius R 2 = grounded plate gap radius R 3 = top hat radius R C = gap centerline radius R G = guiding plate radius R P = particle radius of motion S = aperture radius= time-of-flight distance m = particle mass q = charge of particle t TOF = particle time-of-flight v = velocity ∆R = gap distance ∆x = distance between exit of gap and particle detector α = elevation angle β = azimuthal angle of incoming particles 1 Former Graduate Student, Department of Aerospace Engineering, allen.victor@gmail.com.

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Section: A Experimental Setupmentioning

confidence: 99%

Section: B Proceduresmentioning

confidence: 99%