Laboratory tests of CO2 laser collective Thomson scattering for measurements of ion temperature in the divertor
Collective Thomson scattering (CTS) is a diagnostic method that measures the ion velocity distribution of a plasma. CO2 laser CTS measurements are challenging because of the inherently small Doppler broadening and scattering signals that are difficult to detect. We implemented a heterodyne detection...
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Veröffentlicht in: | Review of scientific instruments 2022-11, Vol.93 (11), p.113547-113547 |
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creator | Hisakado, T. H. Akiyama, T. Carlstrom, T. N. |
description | Collective Thomson scattering (CTS) is a diagnostic method that measures the ion velocity distribution of a plasma. CO2 laser CTS measurements are challenging because of the inherently small Doppler broadening and scattering signals that are difficult to detect. We implemented a heterodyne detection scheme to measure spectrum changes of less than a GHz. To maximize the collected light at small scattering angles, we designed a unique light collection approach consisting of a customized conical-shaped (axicon) lens with a hole in the center. The axicon lens is used to collect the scattered light emitted within an annular cross-section from the scattering volume while the probe beam is passed through the hole at the center of the lens. The performance of the heterodyne detection scheme and annular collection approach was demonstrated using a Transverse Excited Atmospheric pressure CO2 laser with a pulse energy of 160 mJ at λ = 10.59 µm. |
doi_str_mv | 10.1063/5.0101407 |
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The performance of the heterodyne detection scheme and annular collection approach was demonstrated using a Transverse Excited Atmospheric pressure CO2 laser with a pulse energy of 160 mJ at λ = 10.59 µm.</description><identifier>ISSN: 0034-6748</identifier><identifier>EISSN: 1089-7623</identifier><identifier>DOI: 10.1063/5.0101407</identifier><identifier>CODEN: RSINAK</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>Carbon dioxide ; Carbon dioxide lasers ; Ion temperature ; Ion velocity ; Laboratory tests ; Lenses ; Scattering angle ; Scientific apparatus & instruments ; Thomson scattering ; Velocity distribution</subject><ispartof>Review of scientific instruments, 2022-11, Vol.93 (11), p.113547-113547</ispartof><rights>Author(s)</rights><rights>2022 Author(s). 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H.</creatorcontrib><creatorcontrib>Akiyama, T.</creatorcontrib><creatorcontrib>Carlstrom, T. N.</creatorcontrib><title>Laboratory tests of CO2 laser collective Thomson scattering for measurements of ion temperature in the divertor</title><title>Review of scientific instruments</title><description>Collective Thomson scattering (CTS) is a diagnostic method that measures the ion velocity distribution of a plasma. CO2 laser CTS measurements are challenging because of the inherently small Doppler broadening and scattering signals that are difficult to detect. We implemented a heterodyne detection scheme to measure spectrum changes of less than a GHz. To maximize the collected light at small scattering angles, we designed a unique light collection approach consisting of a customized conical-shaped (axicon) lens with a hole in the center. The axicon lens is used to collect the scattered light emitted within an annular cross-section from the scattering volume while the probe beam is passed through the hole at the center of the lens. The performance of the heterodyne detection scheme and annular collection approach was demonstrated using a Transverse Excited Atmospheric pressure CO2 laser with a pulse energy of 160 mJ at λ = 10.59 µm.</description><subject>Carbon dioxide</subject><subject>Carbon dioxide lasers</subject><subject>Ion temperature</subject><subject>Ion velocity</subject><subject>Laboratory tests</subject><subject>Lenses</subject><subject>Scattering angle</subject><subject>Scientific apparatus & instruments</subject><subject>Thomson scattering</subject><subject>Velocity distribution</subject><issn>0034-6748</issn><issn>1089-7623</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2022</creationdate><recordtype>article</recordtype><recordid>eNp9kcFq4zAQhkVpoWm2h76B2F62Bacjy7bk4xLa7kIgl_YsFHncONhWKimFvn0nuGxhF3YuYsQ3_8w_w9iVgIWASt6VCxAgClAnbCZA15mqcnnKZgCyyCpV6HN2EeMOKEohZsyv7MYHm3x45wljity3fLnOeW8jBu5836NL3Rvyp60foh95dDYlDN34wlsf-IA2HgIOOE61HSEJhz2SKP3zjtIt8oYkAnX5xs5a20e8_Hzn7Pnh_mn5K1utH38vf64yJ0WeMtWUdZ0rZ6u6qJ2FjULEBlqBjVYFIOqm1kq3UoDUWDWF1m0uoSG3kG8kyjn7Pun6mDoTXZfQbZ0fR3JjhKZiIQj6MUH74F8P5N4MXXTY93ZEf4gmV0UlaQBa7Jxd_4Xu_CGMZIEoWdUgKlkSdTNRLvgYA7ZmH7rBhncjwBzvY0rzeR9ibyf2OJxNtLc_8JsPX6DZN-3_4H-VPwD6VZ4W</recordid><startdate>20221101</startdate><enddate>20221101</enddate><creator>Hisakado, T. 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N.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Laboratory tests of CO2 laser collective Thomson scattering for measurements of ion temperature in the divertor</atitle><jtitle>Review of scientific instruments</jtitle><date>2022-11-01</date><risdate>2022</risdate><volume>93</volume><issue>11</issue><spage>113547</spage><epage>113547</epage><pages>113547-113547</pages><issn>0034-6748</issn><eissn>1089-7623</eissn><coden>RSINAK</coden><abstract>Collective Thomson scattering (CTS) is a diagnostic method that measures the ion velocity distribution of a plasma. CO2 laser CTS measurements are challenging because of the inherently small Doppler broadening and scattering signals that are difficult to detect. We implemented a heterodyne detection scheme to measure spectrum changes of less than a GHz. To maximize the collected light at small scattering angles, we designed a unique light collection approach consisting of a customized conical-shaped (axicon) lens with a hole in the center. The axicon lens is used to collect the scattered light emitted within an annular cross-section from the scattering volume while the probe beam is passed through the hole at the center of the lens. 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subjects | Carbon dioxide Carbon dioxide lasers Ion temperature Ion velocity Laboratory tests Lenses Scattering angle Scientific apparatus & instruments Thomson scattering Velocity distribution |
title | Laboratory tests of CO2 laser collective Thomson scattering for measurements of ion temperature in the divertor |
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