A 19‐channel fast grating polychromator for ECE measurements in the MTX tokamak
A 19‐channel grating polychromator is developed to measure the temporal evolution of the electron cyclotron emission spectrum in the second and third harmonics in MTX tokamak with an aim to determine the electron temperature in ohmically heated thermal plasmas as well as the electron energy distribu...
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| Veröffentlicht in: | Review of Scientific Instruments 1990-11, Vol.61 (11), p.3520-3523 |
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| container_end_page | 3523 |
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| container_issue | 11 |
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| container_title | Review of Scientific Instruments |
| container_volume | 61 |
| creator | Guharay, S. K. Boyd, D. A. Ellis, R. F. Stauffer, F. J. Lasnier, C. J. |
| description | A 19‐channel grating polychromator is developed to measure the temporal evolution of the electron cyclotron emission spectrum in the second and third harmonics in MTX tokamak with an aim to determine the electron temperature in ohmically heated thermal plasmas as well as the electron energy distribution function in gyrotron and free‐electron laser‐pumped nonthermal plasmas. The spectrometer can cover a spectral range of about 0.3 to 1.4 mm and deliver a maximum spatial resolution of about 1 cm radially. A combination of a 90° off‐axis paraboloidal mirror as the collimating element and a toroidal mirror to focus the diffracted beam yields images on the exit slits with a modest astigmatic distortion. Liquid‐helium‐cooled InSb detectors are installed in nine channels and associated electronics are optimized for a very low noise and fast response time ( ∼ 2 μs). A faster detector element, with response < 100 ns, is envisioned for the remaining ten channels. |
| doi_str_mv | 10.1063/1.1141561 |
| format | Article |
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K. ; Boyd, D. A. ; Ellis, R. F. ; Stauffer, F. J. ; Lasnier, C. J.</creator><creatorcontrib>Guharay, S. K. ; Boyd, D. A. ; Ellis, R. F. ; Stauffer, F. J. ; Lasnier, C. J.</creatorcontrib><description>A 19‐channel grating polychromator is developed to measure the temporal evolution of the electron cyclotron emission spectrum in the second and third harmonics in MTX tokamak with an aim to determine the electron temperature in ohmically heated thermal plasmas as well as the electron energy distribution function in gyrotron and free‐electron laser‐pumped nonthermal plasmas. The spectrometer can cover a spectral range of about 0.3 to 1.4 mm and deliver a maximum spatial resolution of about 1 cm radially. A combination of a 90° off‐axis paraboloidal mirror as the collimating element and a toroidal mirror to focus the diffracted beam yields images on the exit slits with a modest astigmatic distortion. Liquid‐helium‐cooled InSb detectors are installed in nine channels and associated electronics are optimized for a very low noise and fast response time ( ∼ 2 μs). 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K.</creatorcontrib><creatorcontrib>Boyd, D. A.</creatorcontrib><creatorcontrib>Ellis, R. F.</creatorcontrib><creatorcontrib>Stauffer, F. J.</creatorcontrib><creatorcontrib>Lasnier, C. J.</creatorcontrib><title>A 19‐channel fast grating polychromator for ECE measurements in the MTX tokamak</title><title>Review of Scientific Instruments</title><description>A 19‐channel grating polychromator is developed to measure the temporal evolution of the electron cyclotron emission spectrum in the second and third harmonics in MTX tokamak with an aim to determine the electron temperature in ohmically heated thermal plasmas as well as the electron energy distribution function in gyrotron and free‐electron laser‐pumped nonthermal plasmas. The spectrometer can cover a spectral range of about 0.3 to 1.4 mm and deliver a maximum spatial resolution of about 1 cm radially. A combination of a 90° off‐axis paraboloidal mirror as the collimating element and a toroidal mirror to focus the diffracted beam yields images on the exit slits with a modest astigmatic distortion. Liquid‐helium‐cooled InSb detectors are installed in nine channels and associated electronics are optimized for a very low noise and fast response time ( ∼ 2 μs). A faster detector element, with response < 100 ns, is envisioned for the remaining ten channels.</description><subject>70 PLASMA PHYSICS AND FUSION TECHNOLOGY</subject><subject>700102 - Fusion Energy- Plasma Research- Diagnostics</subject><subject>CLOSED PLASMA DEVICES</subject><subject>CYCLOTRON RESONANCE</subject><subject>DISTRIBUTION FUNCTIONS</subject><subject>ELECTRON CYCLOTRON-RESONANCE</subject><subject>ELECTRON SPECTROMETERS</subject><subject>EMISSION SPECTRA</subject><subject>Exact sciences and technology</subject><subject>FREQUENCY MIXING</subject><subject>FUNCTIONS</subject><subject>GRATINGS</subject><subject>HARMONIC GENERATION</subject><subject>Instruments, apparatus, components and techniques common to several branches of physics and astronomy</subject><subject>MEASURING INSTRUMENTS</subject><subject>Optical instruments, equipment and techniques</subject><subject>Physics</subject><subject>PLASMA DIAGNOSTICS</subject><subject>RESOLUTION</subject><subject>RESONANCE</subject><subject>SPATIAL RESOLUTION</subject><subject>SPECTRA</subject><subject>SPECTROMETERS</subject><subject>THERMONUCLEAR DEVICES</subject><subject>TOKAMAK DEVICES</subject><subject>Visible and ultraviolet spectrometers</subject><issn>0034-6748</issn><issn>1089-7623</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1990</creationdate><recordtype>article</recordtype><recordid>eNp90N1KwzAUB_AgCs7phW8QxBuFzpwmTdtLGfMDJiJM8K6kabLWtc1IorA7H8Fn9EnM6NArDRxy88s5J3-EToFMgHB6BRMABgmHPTQCkuVRymO6j0aEUBbxlGWH6Mi5VxJOAjBCT9cY8q-PT1mLvlct1sJ5vLTCN_0Sr027kbU1nfDGYh1qNp3hTgn3ZlWneu9w02NfK_yweMHerEQnVsfoQIvWqZPdPUbPN7PF9C6aP97eT6_nkaQJ9ZHMK0kyVqUsFYzKlBNVxbnMOCExo7nWsc7KVNOylKSsBGVlBVAlXITNy5IIOkZnQ1_jfFM42Xgla2nCL6QvOCQp41lAFwOS1jhnlS7WtumE3RRAim1gBRS7wII9H-xaOClabUUvG_fzIGExZIQFdjmw7ciQk-n_7fknfjf2FxbrStNvJfmF3g</recordid><startdate>19901101</startdate><enddate>19901101</enddate><creator>Guharay, S. 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K.</creatorcontrib><creatorcontrib>Boyd, D. A.</creatorcontrib><creatorcontrib>Ellis, R. F.</creatorcontrib><creatorcontrib>Stauffer, F. J.</creatorcontrib><creatorcontrib>Lasnier, C. J.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>OSTI.GOV</collection><jtitle>Review of Scientific Instruments</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Guharay, S. K.</au><au>Boyd, D. A.</au><au>Ellis, R. F.</au><au>Stauffer, F. J.</au><au>Lasnier, C. J.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A 19‐channel fast grating polychromator for ECE measurements in the MTX tokamak</atitle><jtitle>Review of Scientific Instruments</jtitle><date>1990-11-01</date><risdate>1990</risdate><volume>61</volume><issue>11</issue><spage>3520</spage><epage>3523</epage><pages>3520-3523</pages><issn>0034-6748</issn><eissn>1089-7623</eissn><coden>RSINAK</coden><abstract>A 19‐channel grating polychromator is developed to measure the temporal evolution of the electron cyclotron emission spectrum in the second and third harmonics in MTX tokamak with an aim to determine the electron temperature in ohmically heated thermal plasmas as well as the electron energy distribution function in gyrotron and free‐electron laser‐pumped nonthermal plasmas. The spectrometer can cover a spectral range of about 0.3 to 1.4 mm and deliver a maximum spatial resolution of about 1 cm radially. A combination of a 90° off‐axis paraboloidal mirror as the collimating element and a toroidal mirror to focus the diffracted beam yields images on the exit slits with a modest astigmatic distortion. Liquid‐helium‐cooled InSb detectors are installed in nine channels and associated electronics are optimized for a very low noise and fast response time ( ∼ 2 μs). A faster detector element, with response < 100 ns, is envisioned for the remaining ten channels.</abstract><cop>Woodbury, NY</cop><pub>American Institute of Physics</pub><doi>10.1063/1.1141561</doi><tpages>4</tpages></addata></record> |
| fulltext | fulltext |
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| ispartof | Review of Scientific Instruments, 1990-11, Vol.61 (11), p.3520-3523 |
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| language | eng |
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| source | AIP Digital Archive |
| subjects | 70 PLASMA PHYSICS AND FUSION TECHNOLOGY 700102 - Fusion Energy- Plasma Research- Diagnostics CLOSED PLASMA DEVICES CYCLOTRON RESONANCE DISTRIBUTION FUNCTIONS ELECTRON CYCLOTRON-RESONANCE ELECTRON SPECTROMETERS EMISSION SPECTRA Exact sciences and technology FREQUENCY MIXING FUNCTIONS GRATINGS HARMONIC GENERATION Instruments, apparatus, components and techniques common to several branches of physics and astronomy MEASURING INSTRUMENTS Optical instruments, equipment and techniques Physics PLASMA DIAGNOSTICS RESOLUTION RESONANCE SPATIAL RESOLUTION SPECTRA SPECTROMETERS THERMONUCLEAR DEVICES TOKAMAK DEVICES Visible and ultraviolet spectrometers |
| title | A 19‐channel fast grating polychromator for ECE measurements in the MTX tokamak |
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