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Part 1: Document Description
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Citation |
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Title: |
Grating Polarizers at 170 GHz for ECRH Systems: Low Power Tests and Simulations |
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Identification Number: |
doi:10.7910/DVN/TPF6DZ |
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Distributor: |
Harvard Dataverse |
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Date of Distribution: |
2020-06-04 |
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Version: |
1 |
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Bibliographic Citation: |
Hoffmann, Hannah M.; Jawla, Sudheer K.; Shapiro, Michael A.; Hanson, Gregory; Temkin, Richard J., 2020, "Grating Polarizers at 170 GHz for ECRH Systems: Low Power Tests and Simulations", https://doi.org/10.7910/DVN/TPF6DZ, Harvard Dataverse, V1 |
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Citation |
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Title: |
Grating Polarizers at 170 GHz for ECRH Systems: Low Power Tests and Simulations |
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Identification Number: |
doi:10.7910/DVN/TPF6DZ |
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Authoring Entity: |
Hoffmann, Hannah M.; Jawla, Sudheer K.; Shapiro, Michael A.; Hanson, Gregory; Temkin, Richard J. |
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Distributor: |
Harvard Dataverse |
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Holdings Information: |
https://doi.org/10.7910/DVN/TPF6DZ |
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Study Scope |
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Keywords: |
Physics, corrugated waveguide, electron cyclotron resonance heating, elliptical polarization, linearly polarized, metallic waveguide, microwave theory and techniques, transmission-line measurements, vector network analyzers |
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Abstract: |
The elliptical polarization produced by a pair of sinusoidally profiled miter-bend grating polarizers has been measured experimentally and found to be in excellent agreement with theory. The polarizers were designed to be used at 170 GHz in the miter bends of a 63.5 mm corrugated metallic waveguide for creating the arbitrary elliptically polarized microwave beam needed for electron cyclotron resonance heating of plasma. Using a vector network analyzer to generate a linearly polarized HE11 incident mode, each polarizer was individually tested to measure the rotation α and ellipticity β of the elliptically polarized reflected microwave beam as a function of the grating rotation angle. The grating polarizers were then tested together to measure the elliptical polarization as a function of the angles of the combination of the two polarizers arranged sequentially on the transmission line. The map of the ellipticity versus grating angles agreed very well with numerical simulations using high-frequency structure simulator. Numerical simulations show that up to eight combinations of rotation angles of the two grating polarizers can provide the same ellipticity but with the varying ohmic loss, thus allowing the choice of settings to minimize the ohmic loss, a necessary consideration to minimize heating effects in megawatt power level systems. |
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Notes: |
<a href="http://library.psfc.mit.edu/catalog/reports/2010/18ja/18ja069/abstract.php">PSFC REPORT PSFC/JA-18-69</a><br /><br />This work was supported in part by the U.S. Department of Energy Office of Fusion Energy Sciences under Grant DE-FC02-93ER54186 and in part by the U.S. Department of Energy, UT-Battelle, LLC under Contract DE-AC05-00OR22725. |
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Methodology and Processing |
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Sources Statement |
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Data Access |
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Notes: |
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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Other Study Description Materials |
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Label: |
18ja069_archival_manuscript.pdf |
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Text: | |
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Notes: |
application/pdf |