Electron density measurement of an electrostatically-confined, spherically symmetric, helium plasma using a microwave cavity resonance shift technique

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Thesis. Microwave resonant cavity frequency shift measurements are made to determine the electron density of an electrostatically confined, spherically symmetric helium plasma. Appropriate electron-density distribution functions are assumed and then used to relate the frequency shift to the central electron density. Results from electron injection, with currents of up to 200 mA, accelerating voltages from 100 to 450 V, and pressures of 5.0, 1.0, and 0.5 mTorr, suggest that a potential well is formed and that the minimum value of perveance required for well formation depends on the accelerating voltage and the pressure. Maximum electron densities of 9.5 x 10/sup ... continued below

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Pages: 71

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Grush, W H August 1, 1973.

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Thesis. Microwave resonant cavity frequency shift measurements are made to determine the electron density of an electrostatically confined, spherically symmetric helium plasma. Appropriate electron-density distribution functions are assumed and then used to relate the frequency shift to the central electron density. Results from electron injection, with currents of up to 200 mA, accelerating voltages from 100 to 450 V, and pressures of 5.0, 1.0, and 0.5 mTorr, suggest that a potential well is formed and that the minimum value of perveance required for well formation depends on the accelerating voltage and the pressure. Maximum electron densities of 9.5 x 10/sup 9//cm/sup 3/ are measured. Electron densities of 5.5 x 10/sup 9//cm/sup 3/ are measured during ion injection with currents of up to 20 mA at accelerating voltages between 0.5 kV and 5.0 kV and pressures of 5.0, 1.0, and 0.5 mTorr. Electron densities measured during ion injection show remarkable agreement with those predicted by an earlier theoretical model. (auth)

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Pages: 71

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Dep. NTIS

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  • Other Information: Thesis. Orig. Receipt Date: 30-JUN-74

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  • Report No.: COO--3421-7
  • Grant Number: AT(11-1)-3421
  • DOI: 10.2172/4430287 | External Link
  • Office of Scientific & Technical Information Report Number: 4430287
  • Archival Resource Key: ark:/67531/metadc1021638

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • August 1, 1973

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  • Oct. 15, 2017, 10:09 p.m.

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  • Oct. 26, 2017, 2:03 p.m.

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Grush, W H. Electron density measurement of an electrostatically-confined, spherically symmetric, helium plasma using a microwave cavity resonance shift technique, thesis or dissertation, August 1, 1973; United States. (digital.library.unt.edu/ark:/67531/metadc1021638/: accessed November 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.