Design of a Lyman-Alpha-Based BES for edge plasma density diagnosing on the HL-2A tokamak
•The Lyman-Alpha-Based BES (LAB), a novel diagnostic for plasma density fluctuation measurement on tokamaks.•LAB can measure density fluctuation with a high spatial resolution of 3.3 mm, which is much higher than any of the BES diagnostics worldwide (centimeters). A 20-channel edge Lyman-Alpha-Based...
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| Veröffentlicht in: | Fusion engineering and design 2021-11, Vol.172, p.112911, Article 112911 |
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| creator | Zhou, Y.X. Yu, Y. Ke, R. Jiang, W. Xu, M. Xiao, C.J. Cheng, Y.H. Li, Z.J. Li, B.L. Wang, Z.H. Li, J.Q. Duan, X.R. Ye, M.Y. |
| description | •The Lyman-Alpha-Based BES (LAB), a novel diagnostic for plasma density fluctuation measurement on tokamaks.•LAB can measure density fluctuation with a high spatial resolution of 3.3 mm, which is much higher than any of the BES diagnostics worldwide (centimeters).
A 20-channel edge Lyman-Alpha-Based Beam emission spectroscopy (LAB) system, which diagnoses edge density fluctuations by measuring the Doppler-shifted Lyman-alpha line (n= 2 → 1, 121.53 nm) emitting via the interaction of neutral beams and plasma particles, is under developing on the HL-2A tokamak. The radial observation range covers the main plasma from R= 1.98 m to 2.05 m with a spatial resolution of about 0.33 cm and a temporal resolution of 1 μs. The overall design for this system is completed, including the reflective collection optics, the spectrometer with a reflective toroidal grating, the detector array, and the vacuum system. Compared with the traditional beam emission spectroscopy (BES) which measures the Balmer-alpha line (n= 3 → 2, 656.10 nm), LAB promises to achieve higher signal-to-noise measurements of smaller-scale fluctuations and therefore detect previously unobserved low-amplitude pedestal turbulence. |
| doi_str_mv | 10.1016/j.fusengdes.2021.112911 |
| format | Article |
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A 20-channel edge Lyman-Alpha-Based Beam emission spectroscopy (LAB) system, which diagnoses edge density fluctuations by measuring the Doppler-shifted Lyman-alpha line (n= 2 → 1, 121.53 nm) emitting via the interaction of neutral beams and plasma particles, is under developing on the HL-2A tokamak. The radial observation range covers the main plasma from R= 1.98 m to 2.05 m with a spatial resolution of about 0.33 cm and a temporal resolution of 1 μs. The overall design for this system is completed, including the reflective collection optics, the spectrometer with a reflective toroidal grating, the detector array, and the vacuum system. Compared with the traditional beam emission spectroscopy (BES) which measures the Balmer-alpha line (n= 3 → 2, 656.10 nm), LAB promises to achieve higher signal-to-noise measurements of smaller-scale fluctuations and therefore detect previously unobserved low-amplitude pedestal turbulence.</description><identifier>ISSN: 0920-3796</identifier><identifier>EISSN: 1873-7196</identifier><identifier>DOI: 10.1016/j.fusengdes.2021.112911</identifier><language>eng</language><publisher>Amsterdam: Elsevier B.V</publisher><subject>Emission spectroscopy ; Neutral beams ; Particle beams ; Plasma density ; Spatial resolution ; Spectrum analysis ; Temporal resolution ; Tokamak devices</subject><ispartof>Fusion engineering and design, 2021-11, Vol.172, p.112911, Article 112911</ispartof><rights>2021 Elsevier B.V.</rights><rights>Copyright Elsevier Science Ltd. Nov 2021</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c343t-eb7449c10fec96976d91eec9fa944137afb5671b6e253d44564cf8deb20157d23</citedby><cites>FETCH-LOGICAL-c343t-eb7449c10fec96976d91eec9fa944137afb5671b6e253d44564cf8deb20157d23</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.fusengdes.2021.112911$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3548,27922,27923,45993</link.rule.ids></links><search><creatorcontrib>Zhou, Y.X.</creatorcontrib><creatorcontrib>Yu, Y.</creatorcontrib><creatorcontrib>Ke, R.</creatorcontrib><creatorcontrib>Jiang, W.</creatorcontrib><creatorcontrib>Xu, M.</creatorcontrib><creatorcontrib>Xiao, C.J.</creatorcontrib><creatorcontrib>Cheng, Y.H.</creatorcontrib><creatorcontrib>Li, Z.J.</creatorcontrib><creatorcontrib>Li, B.L.</creatorcontrib><creatorcontrib>Wang, Z.H.</creatorcontrib><creatorcontrib>Li, J.Q.</creatorcontrib><creatorcontrib>Duan, X.R.</creatorcontrib><creatorcontrib>Ye, M.Y.</creatorcontrib><title>Design of a Lyman-Alpha-Based BES for edge plasma density diagnosing on the HL-2A tokamak</title><title>Fusion engineering and design</title><description>•The Lyman-Alpha-Based BES (LAB), a novel diagnostic for plasma density fluctuation measurement on tokamaks.•LAB can measure density fluctuation with a high spatial resolution of 3.3 mm, which is much higher than any of the BES diagnostics worldwide (centimeters).
A 20-channel edge Lyman-Alpha-Based Beam emission spectroscopy (LAB) system, which diagnoses edge density fluctuations by measuring the Doppler-shifted Lyman-alpha line (n= 2 → 1, 121.53 nm) emitting via the interaction of neutral beams and plasma particles, is under developing on the HL-2A tokamak. The radial observation range covers the main plasma from R= 1.98 m to 2.05 m with a spatial resolution of about 0.33 cm and a temporal resolution of 1 μs. The overall design for this system is completed, including the reflective collection optics, the spectrometer with a reflective toroidal grating, the detector array, and the vacuum system. 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A 20-channel edge Lyman-Alpha-Based Beam emission spectroscopy (LAB) system, which diagnoses edge density fluctuations by measuring the Doppler-shifted Lyman-alpha line (n= 2 → 1, 121.53 nm) emitting via the interaction of neutral beams and plasma particles, is under developing on the HL-2A tokamak. The radial observation range covers the main plasma from R= 1.98 m to 2.05 m with a spatial resolution of about 0.33 cm and a temporal resolution of 1 μs. The overall design for this system is completed, including the reflective collection optics, the spectrometer with a reflective toroidal grating, the detector array, and the vacuum system. Compared with the traditional beam emission spectroscopy (BES) which measures the Balmer-alpha line (n= 3 → 2, 656.10 nm), LAB promises to achieve higher signal-to-noise measurements of smaller-scale fluctuations and therefore detect previously unobserved low-amplitude pedestal turbulence.</abstract><cop>Amsterdam</cop><pub>Elsevier B.V</pub><doi>10.1016/j.fusengdes.2021.112911</doi></addata></record> |
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| source | ScienceDirect Journals (5 years ago - present) |
| subjects | Emission spectroscopy Neutral beams Particle beams Plasma density Spatial resolution Spectrum analysis Temporal resolution Tokamak devices |
| title | Design of a Lyman-Alpha-Based BES for edge plasma density diagnosing on the HL-2A tokamak |
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