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Part 1: Document Description
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Citation |
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Title: |
Electron density and gas density measurements in a millimeter-wave discharge |
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Identification Number: |
doi:10.7910/DVN/0ZADQU |
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Distributor: |
Harvard Dataverse |
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Date of Distribution: |
2018-12-05 |
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Version: |
1 |
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Bibliographic Citation: |
S. C. Schaub, J. S. Hummelt, W. C. Guss, M. A. Shapiro, R. J. Temkin, 2018, "Electron density and gas density measurements in a millimeter-wave discharge", https://doi.org/10.7910/DVN/0ZADQU, Harvard Dataverse, V1 |
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Citation |
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Title: |
Electron density and gas density measurements in a millimeter-wave discharge |
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Identification Number: |
doi:10.7910/DVN/0ZADQU |
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Authoring Entity: |
S. C. Schaub, J. S. Hummelt, W. C. Guss, M. A. Shapiro, R. J. Temkin |
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Distributor: |
Harvard Dataverse |
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Holdings Information: |
https://doi.org/10.7910/DVN/0ZADQU |
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Study Scope |
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Keywords: |
Physics, diagnostics, gas discharges, gyrotron, laser diagnostics, millimeter waves |
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Abstract: |
Electron density and neutral gas density have been measured in a non-equilibrium air breakdown plasma using optical emission spectroscopy and two-dimensional laser interferometry, respectively. A plasma was created with a focused high frequency microwave beam in air. Experiments were run with 110 GHz and 124.5 GHz microwaves at powers up to 1.2 MW. Microwave pulses were 3 microsec. long at 110 GHz and 2.2 microsec. long at 124.5 GHz. Electron density was measured over a pressure range of 25 to 700 Torr as the input microwave power was varied. Electron density was found to be close to the critical density over the pressure range studied and to vary weakly with input power. Neutral gas density was measured over a pressure range from 150 to 750 Torr at power levels high above the threshold for initiating breakdown. The two-dimensional structure of the neutral gas density was resolved. Intense, localized heating was found to occur hundreds of nanoseconds after visible plasma formed. This heating led to neutral gas density reductions of greater than 80% where peak plasma densities occurred. Spatial and temporal structure of gas heating at atmospheric pressure were found to agree well with numerical simulations. |
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Notes: |
<a href="http://library.psfc.mit.edu/catalog/reports/2010/16ja/16ja051/16ja051_abs.html">PSFC REPORT PSFC/JA-16-51</a><br /><br />This research was supported by the Department of Energy, Office of Fusion Energy Sciences through grant DE-FC02-93ER54186 and by the Air Force Office of Scientific Research under grant FA9550-15-1-0058. |
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Sources Statement |
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Data Access |
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This dataset is made available without information on how it can be used. You should communicate with the Contact(s) specified before use. |
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