A novel Doppler backscattering (DBS) system to simultaneously monitor radio frequency plasma fluctuations and low frequency turbulence
| Title: | A novel Doppler backscattering (DBS) system to simultaneously monitor radio frequency plasma fluctuations and low frequency turbulence |
|---|---|
| Authors: | Chowdhury, S., Crocker, N. A., Peebles, W. A., Rhodes, T. L., Zeng, L., Van Compernolle, B., Brookman, M., Pinsker, R. I., Lau, C. |
| Publication Year: | 2023 |
| Collection: | Physics (Other) |
| Subject Terms: | Physics - Plasma Physics |
| More Details: | A novel quadrature Doppler Backscattering (DBS) system has been developed and optimized for the E-band (60-90GHz) frequency range using either O-mode or X-mode polarization in DIII-D plasmas. In general, DBS measures the amplitude of density fluctuations and their velocity in the lab frame. The system can simultaneously monitor both low-frequency turbulence (f < 10MHz) and radiofrequency plasma density fluctuations over a selectable frequency range (20-500 MHz). Detection of high-frequency fluctuations has been demonstrated for low harmonics of the ion cyclotron frequency (e.g., 2fci~23MHz) and externally driven high-frequency helicon waves (f = 476MHz) using an adjustable frequency down conversion system. Importantly, this extends the application of DBS to a high-frequency spectral domain while maintaining important turbulence and flow measurement capabilities. This unique system has low phase noise, good temporal resolution (sub-millisecond) and excellent wavenumber coverage (k_{\theta} ~ 1-20cm^{-1} and k_r ~ 20-30cm^{-1}). As a demonstration, localized internal DIII-D plasma measurements are presented from turbulence (f <= 5MHz), Alfvenic waves (f~6.5MHz), ion cyclotron waves (f >= 20MHz) as well as fluctuations around 476MHz driven by an external high-power 476 MHz helicon wave antenna. In the future, helicon measurements will be used to validate GENRAY and AORSA modeling tools for prediction of helicon wave propagation, absorption and current drive location for the newly installed helicon current drive system on DIII-D. Comment: 13 pages, 14 figs, journal paper |
| Document Type: | Working Paper |
| DOI: | 10.1063/5.0149654 |
| Access URL: | http://arxiv.org/abs/2302.03009 |
| Accession Number: | edsarx.2302.03009 |
| Database: | arXiv |
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| Items | – Name: Title Label: Title Group: Ti Data: A novel Doppler backscattering (DBS) system to simultaneously monitor radio frequency plasma fluctuations and low frequency turbulence – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Chowdhury%2C+S%2E%22">Chowdhury, S.</searchLink><br /><searchLink fieldCode="AR" term="%22Crocker%2C+N%2E+A%2E%22">Crocker, N. A.</searchLink><br /><searchLink fieldCode="AR" term="%22Peebles%2C+W%2E+A%2E%22">Peebles, W. A.</searchLink><br /><searchLink fieldCode="AR" term="%22Rhodes%2C+T%2E+L%2E%22">Rhodes, T. L.</searchLink><br /><searchLink fieldCode="AR" term="%22Zeng%2C+L%2E%22">Zeng, L.</searchLink><br /><searchLink fieldCode="AR" term="%22Van+Compernolle%2C+B%2E%22">Van Compernolle, B.</searchLink><br /><searchLink fieldCode="AR" term="%22Brookman%2C+M%2E%22">Brookman, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Pinsker%2C+R%2E+I%2E%22">Pinsker, R. I.</searchLink><br /><searchLink fieldCode="AR" term="%22Lau%2C+C%2E%22">Lau, C.</searchLink> – Name: DatePubCY Label: Publication Year Group: Date Data: 2023 – Name: Subset Label: Collection Group: HoldingsInfo Data: Physics (Other) – Name: Subject Label: Subject Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Physics+-+Plasma+Physics%22">Physics - Plasma Physics</searchLink> – Name: Abstract Label: Description Group: Ab Data: A novel quadrature Doppler Backscattering (DBS) system has been developed and optimized for the E-band (60-90GHz) frequency range using either O-mode or X-mode polarization in DIII-D plasmas. In general, DBS measures the amplitude of density fluctuations and their velocity in the lab frame. The system can simultaneously monitor both low-frequency turbulence (f < 10MHz) and radiofrequency plasma density fluctuations over a selectable frequency range (20-500 MHz). Detection of high-frequency fluctuations has been demonstrated for low harmonics of the ion cyclotron frequency (e.g., 2fci~23MHz) and externally driven high-frequency helicon waves (f = 476MHz) using an adjustable frequency down conversion system. Importantly, this extends the application of DBS to a high-frequency spectral domain while maintaining important turbulence and flow measurement capabilities. This unique system has low phase noise, good temporal resolution (sub-millisecond) and excellent wavenumber coverage (k_{\theta} ~ 1-20cm^{-1} and k_r ~ 20-30cm^{-1}). As a demonstration, localized internal DIII-D plasma measurements are presented from turbulence (f <= 5MHz), Alfvenic waves (f~6.5MHz), ion cyclotron waves (f >= 20MHz) as well as fluctuations around 476MHz driven by an external high-power 476 MHz helicon wave antenna. In the future, helicon measurements will be used to validate GENRAY and AORSA modeling tools for prediction of helicon wave propagation, absorption and current drive location for the newly installed helicon current drive system on DIII-D.<br />Comment: 13 pages, 14 figs, journal paper – Name: TypeDocument Label: Document Type Group: TypDoc Data: Working Paper – Name: DOI Label: DOI Group: ID Data: 10.1063/5.0149654 – Name: URL Label: Access URL Group: URL Data: <link linkTarget="URL" linkTerm="http://arxiv.org/abs/2302.03009" linkWindow="_blank">http://arxiv.org/abs/2302.03009</link> – Name: AN Label: Accession Number Group: ID Data: edsarx.2302.03009 |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1063/5.0149654 Subjects: – SubjectFull: Physics - Plasma Physics Type: general Titles: – TitleFull: A novel Doppler backscattering (DBS) system to simultaneously monitor radio frequency plasma fluctuations and low frequency turbulence Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Chowdhury, S. – PersonEntity: Name: NameFull: Crocker, N. A. – PersonEntity: Name: NameFull: Peebles, W. A. – PersonEntity: Name: NameFull: Rhodes, T. L. – PersonEntity: Name: NameFull: Zeng, L. – PersonEntity: Name: NameFull: Van Compernolle, B. – PersonEntity: Name: NameFull: Brookman, M. – PersonEntity: Name: NameFull: Pinsker, R. I. – PersonEntity: Name: NameFull: Lau, C. IsPartOfRelationships: – BibEntity: Dates: – D: 06 M: 02 Type: published Y: 2023 |
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