Overview of the Wendelstein 7-X phase contrast imaging diagnostic
Abstract
A phase contrast imaging (PCI) diagnostic has been developed for the Wendelstein 7-X (W7-X) stellarator. This diagnostic, funded by the U.S. Department of Energy through the Office of Fusion Energy Sciences, is a collaboration between the Max Planck Institute for Plasmaphysics, MIT, and SUNY Cortland. The primary motivation for the development of the PCI diagnostic is measurement of turbulent fluctuations, such as the ion temperature gradient, electron temperature gradient, and the trapped electron mode instabilities. Understanding how the magnetic geometry and other externally controllable parameters, such as the fueling method and heating scheme, modify the amplitude and spectrum of turbulence is important for finding operational scenarios that can lead to improved performance at fusion-relevant temperatures and densities. The PCI system is also sensitive to coherent fluctuations, as may arise from Alfvén eigenmodes or other MHD activity, for example. The PCI method creates an image of line-integrated variations in the index of refraction. For a plasma, the image created is proportional to the line-integral of electron density fluctuations. Here, this paper provides an overview of some key features of the hardware and the optical system and presents two examples of recent measurements from the W7-X OP1.2a experimental campaign.
- Authors:
-
- SUNY Cortland, NY (United States)
- MIT Plasma Science and Fusion Center, Cambridge, MA (United States)
- Max Planck Inst. for Plasma Physics, Greifswald (Germany); Technical Univ. of Denmark, Kongens Lyngby (Denmark)
- Max Planck Inst. for Plasma Physics, Greifswald (Germany)
- Publication Date:
- Research Org.:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1612118
- Alternate Identifier(s):
- OSTI ID: 1464858
- Grant/Contract Number:
- SC0014229
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Review of Scientific Instruments
- Additional Journal Information:
- Journal Volume: 89; Journal Issue: 10; Journal ID: ISSN 0034-6748
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 47 OTHER INSTRUMENTATION; instruments & instrumentation; physics; fusion energy; plasma confinement; optical devices; stellarators
Citation Formats
Edlund, Eric M., Porkolab, M., Huang, Z., Grulke, O., Böttger, L. -G., von Sehren, C., and von Stechow, A. Overview of the Wendelstein 7-X phase contrast imaging diagnostic. United States: N. p., 2018.
Web. doi:10.1063/1.5038804.
Edlund, Eric M., Porkolab, M., Huang, Z., Grulke, O., Böttger, L. -G., von Sehren, C., & von Stechow, A. Overview of the Wendelstein 7-X phase contrast imaging diagnostic. United States. https://doi.org/10.1063/1.5038804
Edlund, Eric M., Porkolab, M., Huang, Z., Grulke, O., Böttger, L. -G., von Sehren, C., and von Stechow, A. Thu .
"Overview of the Wendelstein 7-X phase contrast imaging diagnostic". United States. https://doi.org/10.1063/1.5038804. https://www.osti.gov/servlets/purl/1612118.
@article{osti_1612118,
title = {Overview of the Wendelstein 7-X phase contrast imaging diagnostic},
author = {Edlund, Eric M. and Porkolab, M. and Huang, Z. and Grulke, O. and Böttger, L. -G. and von Sehren, C. and von Stechow, A.},
abstractNote = {A phase contrast imaging (PCI) diagnostic has been developed for the Wendelstein 7-X (W7-X) stellarator. This diagnostic, funded by the U.S. Department of Energy through the Office of Fusion Energy Sciences, is a collaboration between the Max Planck Institute for Plasmaphysics, MIT, and SUNY Cortland. The primary motivation for the development of the PCI diagnostic is measurement of turbulent fluctuations, such as the ion temperature gradient, electron temperature gradient, and the trapped electron mode instabilities. Understanding how the magnetic geometry and other externally controllable parameters, such as the fueling method and heating scheme, modify the amplitude and spectrum of turbulence is important for finding operational scenarios that can lead to improved performance at fusion-relevant temperatures and densities. The PCI system is also sensitive to coherent fluctuations, as may arise from Alfvén eigenmodes or other MHD activity, for example. The PCI method creates an image of line-integrated variations in the index of refraction. For a plasma, the image created is proportional to the line-integral of electron density fluctuations. Here, this paper provides an overview of some key features of the hardware and the optical system and presents two examples of recent measurements from the W7-X OP1.2a experimental campaign.},
doi = {10.1063/1.5038804},
journal = {Review of Scientific Instruments},
number = 10,
volume = 89,
place = {United States},
year = {Thu Aug 16 00:00:00 EDT 2018},
month = {Thu Aug 16 00:00:00 EDT 2018}
}
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Works referencing / citing this record:
Performance of Wendelstein 7-X stellarator plasmas during the first divertor operation phase
journal, August 2019
- Wolf, R. C.; Alonso, A.; Äkäslompolo, S.
- Physics of Plasmas, Vol. 26, Issue 8
Overview of first Wendelstein 7-X high-performance operation
journal, June 2019
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- Nuclear Fusion, Vol. 59, Issue 11
Overview of first Wendelstein 7-X high-performance operation
text, January 2019
- Klinger, T.; Andreeva, T.; Bozhenkov, Sergey
- Technische Universität Berlin