Tomographic reconstruction of two-dimensional radiated power distribution during impurity injection in KSTAR plasmas using an infrared imaging video bolometer
Based on the two-dimensional radiation images obtained by an infrared imaging video bolometer (IRVB) with tangential view, the two dimensional radiation profiles of plasmas in KSTAR were reconstructed. The IRVB installed on KSTAR has a tangential view of the plasma, and thus tomographic reconstructi...
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Published in | Current applied physics Vol. 18; no. 4; pp. 461 - 468 |
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Main Authors | , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.04.2018
한국물리학회 |
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Online Access | Get full text |
ISSN | 1567-1739 1878-1675 |
DOI | 10.1016/j.cap.2018.01.009 |
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Abstract | Based on the two-dimensional radiation images obtained by an infrared imaging video bolometer (IRVB) with tangential view, the two dimensional radiation profiles of plasmas in KSTAR were reconstructed. The IRVB installed on KSTAR has a tangential view of the plasma, and thus tomographic reconstruction of the raw images of radiation profiles was performed to remove the chord-integration effect by using a tomographic reconstruction code based on the Phillips-Tikhonov algorithm. Phantom reconstruction tests with various synthetic images were carried out to validate the accuracy of the reconstruction results. It is found that hollow radiation phantoms with strong divertor radiation were reconstructed with high accuracy. Furthermore, the effects of the number of channels of the IR camera, and the number of pixels of the plasma and of the IRVB on reconstruction performance are studied with phantom tests. Two-dimensionally reconstructed images of KSTAR plasmas demonstrated that radiation loss at the plasma edge and near the divertor region increased significantly after gaseous impurity injection. The total radiated power was up to 1.2 MW at the disruption, which was 40% of the NBI power. After argon and krypton gas injection, total radiated power was increased by 325 kW and 180 kW, respectively.
•The tomography code forthe infrared imaging video bolometer in KSTAR was developed to reconstruct plasma emissivity.•The effects of IRVB hardware on reconstruction performance are investigated by phantom reconstruction tests.•Total radiated power of KSTAR plasmas can be calculated using the two-dimensionally reconstructed emissivity.•The emissivity at both the plasma core and the divertor increased significantly due to gaseous impurity injection. |
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AbstractList | Based on the two-dimensional radiation images obtained by an infrared imaging video bolometer (IRVB) with tangential view, the two dimensional radiation profiles of plasmas in KSTAR were reconstructed. The IRVB installed on KSTAR has a tangential view of the plasma, and thus tomographic reconstruction of the raw images of radiation profiles was performed to remove the chord-integration effect by using a tomographic reconstruction code based on the Phillips-Tikhonov algorithm. Phantom reconstruction tests with various synthetic images were carried out to validate the accuracy of the reconstruction results. It is found that hollow radiation phantoms with strong divertor radiation were reconstructed with high accuracy. Furthermore, the effects of the number of channels of the IR camera, and the number of pixels of the plasma and of the IRVB on reconstruction performance are studied with phantom tests. Two-dimensionally reconstructed images of KSTAR plasmas demonstrated that radiation loss at the plasma edge and near the divertor region increased significantly after gaseous impurity injection. The total radiated power was up to 1.2MWat the disruption, which was 40% of the NBI power. After argon and krypton gas injection, total radiated power was increased by 325 kW and 180 kW, respectively. KCI Citation Count: 8 Based on the two-dimensional radiation images obtained by an infrared imaging video bolometer (IRVB) with tangential view, the two dimensional radiation profiles of plasmas in KSTAR were reconstructed. The IRVB installed on KSTAR has a tangential view of the plasma, and thus tomographic reconstruction of the raw images of radiation profiles was performed to remove the chord-integration effect by using a tomographic reconstruction code based on the Phillips-Tikhonov algorithm. Phantom reconstruction tests with various synthetic images were carried out to validate the accuracy of the reconstruction results. It is found that hollow radiation phantoms with strong divertor radiation were reconstructed with high accuracy. Furthermore, the effects of the number of channels of the IR camera, and the number of pixels of the plasma and of the IRVB on reconstruction performance are studied with phantom tests. Two-dimensionally reconstructed images of KSTAR plasmas demonstrated that radiation loss at the plasma edge and near the divertor region increased significantly after gaseous impurity injection. The total radiated power was up to 1.2 MW at the disruption, which was 40% of the NBI power. After argon and krypton gas injection, total radiated power was increased by 325 kW and 180 kW, respectively. •The tomography code forthe infrared imaging video bolometer in KSTAR was developed to reconstruct plasma emissivity.•The effects of IRVB hardware on reconstruction performance are investigated by phantom reconstruction tests.•Total radiated power of KSTAR plasmas can be calculated using the two-dimensionally reconstructed emissivity.•The emissivity at both the plasma core and the divertor increased significantly due to gaseous impurity injection. |
Author | Choe, Wonho Hong, S.H. Seo, D.C. Oh, S. Peterson, B.J. Mukai, K. Sano, R. Hong, Joohwan Lee, H.Y. Jang, Juhyeok |
Author_xml | – sequence: 1 givenname: Juhyeok surname: Jang fullname: Jang, Juhyeok organization: Department of Physics, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea – sequence: 2 givenname: Wonho surname: Choe fullname: Choe, Wonho email: wchoe@kaist.ac.kr organization: Department of Physics, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea – sequence: 3 givenname: B.J. surname: Peterson fullname: Peterson, B.J. organization: National Institute of Fusion Science, 322-6 Oroshi-cho, Toki-city, Gifu 509-5292, Japan – sequence: 4 givenname: D.C. surname: Seo fullname: Seo, D.C. organization: National Fusion Research Institute, 169-148 Gwahak-ro, Yuseong-gu, Daejeon 34133, Republic of Korea – sequence: 5 givenname: K. surname: Mukai fullname: Mukai, K. organization: National Institute of Fusion Science, 322-6 Oroshi-cho, Toki-city, Gifu 509-5292, Japan – sequence: 6 givenname: R. surname: Sano fullname: Sano, R. organization: National Institutes for Quantum and Radiological Science and Technology, Naka, Ibaraki 311-0193, Japan – sequence: 7 givenname: S. surname: Oh fullname: Oh, S. organization: National Fusion Research Institute, 169-148 Gwahak-ro, Yuseong-gu, Daejeon 34133, Republic of Korea – sequence: 8 givenname: S.H. surname: Hong fullname: Hong, S.H. organization: National Fusion Research Institute, 169-148 Gwahak-ro, Yuseong-gu, Daejeon 34133, Republic of Korea – sequence: 9 givenname: Joohwan surname: Hong fullname: Hong, Joohwan organization: Department of Physics, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea – sequence: 10 givenname: H.Y. surname: Lee fullname: Lee, H.Y. organization: Department of Physics, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea |
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Title | Tomographic reconstruction of two-dimensional radiated power distribution during impurity injection in KSTAR plasmas using an infrared imaging video bolometer |
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