First observation of full radial profile of Z<sub>eff</sub> using a high-performance visible spectrometer in EAST tokamak with full tungsten divertors
Abstract The effective ion charge, Z eff , is a critical parameter in quantifying the impurity content and collisionality, and studying neutron yield and impurity transport in magnetically confined fusion plasmas. In order to obtain a full radial Z eff profile in the EAST tokamak, a visible spectrometer system with endscope type optics has been newly developed. A vertical profile of visible bremsstrahlung continuum is observed at 597.8±1.0 nm with well-focused fiber images in a typical L-mode discharge. A local emissivity profile of the visible bremsstrahlung is analyzed using Abel inversion algorithm. The Z eff radial profile is thus obtained for the first time in the EAST experiment.
Authors
- S. Morita (ORCID: https://orcid.org/0000-0003-4139-7721)
- Hao Wu (ORCID: https://orcid.org/0000-0003-2014-8961)
- Yunxin Cheng (ORCID: https://orcid.org/0000-0002-9195-2757)
- Jingxin Yang
- Wei Zhang (ORCID: https://orcid.org/0000-0003-1621-9843)
- Xiang Gao (ORCID: https://orcid.org/0000-0003-1885-2538)
- M. Kobayashi (ORCID: https://orcid.org/0000-0002-0990-7093)
- Chen Zhou (ORCID: https://orcid.org/0000-0003-3529-4283)
- J. Chen (ORCID: https://orcid.org/0009-0006-2079-7493)
- Zheng Wei Li
- Hai Qing Liu
- S.X. Wang (ORCID: https://orcid.org/0009-0008-8423-7924)
- Feng Zhang (ORCID: https://orcid.org/0000-0003-0326-5365)
- Ling Zhang (ORCID: https://orcid.org/0000-0002-8778-8704)
- Ai Lan Hu
- Yushu Cao (ORCID: https://orcid.org/0000-0002-9922-413X)
Institutions
- University of Science and Technology of China (CN)
- Anhui University (CN)
- Chinese Academy of Sciences (CN)
- Hefei Institutes of Physical Science (CN)
- National Institute for Fusion Science (JP)
Publication Details
- Journal
- Journal of Instrumentation
- Published
- 2025-07-01
- DOI
- https://doi.org/10.1088/1748-0221/20/07/c07016
- Primary Topic
- Magnetic confinement fusion research
- Type
- article
- Field-Weighted Citation Impact
- 0.00