Predicted performance of a tangential viewing hard x-ray camera for the DIII-D high field side lower hybrid current drive experiment
<jats:p> High field side launch of lower hybrid current drive (LHCD) has improved accessibility and penetration over low field side launch on DIII-D. Simulations predict single pass absorption under a wide range of plasma conditions. Hard x-ray (HXR) measurement of LHCD generated fast electron...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
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AIP Publishing
2023
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| Online Access: | https://hdl.handle.net/1721.1/146973 |
| _version_ | 1811072495490433024 |
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| author | Rutherford, Grant Seltzman, Andrew H Wukitch, Stephen J |
| author2 | Massachusetts Institute of Technology. Plasma Science and Fusion Center |
| author_facet | Massachusetts Institute of Technology. Plasma Science and Fusion Center Rutherford, Grant Seltzman, Andrew H Wukitch, Stephen J |
| author_sort | Rutherford, Grant |
| collection | MIT |
| description | <jats:p> High field side launch of lower hybrid current drive (LHCD) has improved accessibility and penetration over low field side launch on DIII-D. Simulations predict single pass absorption under a wide range of plasma conditions. Hard x-ray (HXR) measurement of LHCD generated fast electron bremsstrahlung (50–250 keV) will validate wave propagation and absorption. Emissivity profiles are recovered from one-dimensional inversion of HXR brightness to determine LH damping location, fast electron slowing down time, and some indication of the fast electron energy. The camera will be implemented by populating 32 tangential sightlines of the existing Gamma Ray Imager with Kromek SPEAR<jats:sup>TM</jats:sup> Cadmium Zinc Telluride (CZT) detectors sensitive to 10–1000 keV photons with 10 keV energy resolution. Expected count rates allow for <0.5 ms time resolution. Pulses are processed using 50 ns shaping time Cremat CR-200 Gaussian shaping modules and are digitized by 25 MHz D-TACQ ACQ216 digitizers. The performance of the HXR camera is evaluated by comparing predicted fast electron density profiles and inverted synthetic brightnesses obtained from the ray-tracing/Fokker–Planck codes GENRAY/CQL3D. Inversions closely matched predicted fast electron profiles for a range of experimental parameters. </jats:p> |
| first_indexed | 2024-09-23T09:06:52Z |
| format | Article |
| id | mit-1721.1/146973 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T09:06:52Z |
| publishDate | 2023 |
| publisher | AIP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/1469732023-01-20T20:23:53Z Predicted performance of a tangential viewing hard x-ray camera for the DIII-D high field side lower hybrid current drive experiment Rutherford, Grant Seltzman, Andrew H Wukitch, Stephen J Massachusetts Institute of Technology. Plasma Science and Fusion Center <jats:p> High field side launch of lower hybrid current drive (LHCD) has improved accessibility and penetration over low field side launch on DIII-D. Simulations predict single pass absorption under a wide range of plasma conditions. Hard x-ray (HXR) measurement of LHCD generated fast electron bremsstrahlung (50–250 keV) will validate wave propagation and absorption. Emissivity profiles are recovered from one-dimensional inversion of HXR brightness to determine LH damping location, fast electron slowing down time, and some indication of the fast electron energy. The camera will be implemented by populating 32 tangential sightlines of the existing Gamma Ray Imager with Kromek SPEAR<jats:sup>TM</jats:sup> Cadmium Zinc Telluride (CZT) detectors sensitive to 10–1000 keV photons with 10 keV energy resolution. Expected count rates allow for <0.5 ms time resolution. Pulses are processed using 50 ns shaping time Cremat CR-200 Gaussian shaping modules and are digitized by 25 MHz D-TACQ ACQ216 digitizers. The performance of the HXR camera is evaluated by comparing predicted fast electron density profiles and inverted synthetic brightnesses obtained from the ray-tracing/Fokker–Planck codes GENRAY/CQL3D. Inversions closely matched predicted fast electron profiles for a range of experimental parameters. </jats:p> 2023-01-04T18:49:19Z 2023-01-04T18:49:19Z 2022-10-01 2023-01-04T18:34:11Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/146973 Rutherford, Grant, Seltzman, Andrew H and Wukitch, Stephen J. 2022. "Predicted performance of a tangential viewing hard x-ray camera for the DIII-D high field side lower hybrid current drive experiment." Review of Scientific Instruments, 93 (10). en 10.1063/5.0099168 Review of Scientific Instruments Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ application/pdf AIP Publishing American Institute of Physics (AIP) |
| spellingShingle | Rutherford, Grant Seltzman, Andrew H Wukitch, Stephen J Predicted performance of a tangential viewing hard x-ray camera for the DIII-D high field side lower hybrid current drive experiment |
| title | Predicted performance of a tangential viewing hard x-ray camera for the DIII-D high field side lower hybrid current drive experiment |
| title_full | Predicted performance of a tangential viewing hard x-ray camera for the DIII-D high field side lower hybrid current drive experiment |
| title_fullStr | Predicted performance of a tangential viewing hard x-ray camera for the DIII-D high field side lower hybrid current drive experiment |
| title_full_unstemmed | Predicted performance of a tangential viewing hard x-ray camera for the DIII-D high field side lower hybrid current drive experiment |
| title_short | Predicted performance of a tangential viewing hard x-ray camera for the DIII-D high field side lower hybrid current drive experiment |
| title_sort | predicted performance of a tangential viewing hard x ray camera for the diii d high field side lower hybrid current drive experiment |
| url | https://hdl.handle.net/1721.1/146973 |
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