Helium line ratio spectroscopy for high spatiotemporal resolution plasma edge profile measurements at ASDEX Upgrade (invited)
Abstract
The thermal helium beam edge diagnostic has recently been upgraded at the ASDEX Upgrade (AUG) tokamak experiment. Line ratio spectroscopy on neutral helium is a valuable tool for simultaneous determination of the electron temperature and density of plasmas. The diagnostic now offers a temporal resolution of 900 kHz with a spatial resolution of up to 3 mm at 32 lines of sight (LOS) simultaneously. The LOS covers a radial region of 8.5 cm, starting at the limiter radius and reaching into the confined region beyond the separatrix. Two components are of particular importance for the aforementioned hardware improvements. The first is the optical head, which collects the light from the experiment. Equipped with an innovative clamping system for optical fiber ends, an arbitrary distribution pattern of LOS can be achieved to gain radial and poloidal profiles. The second major development is a new polychromator system that measures the intensity of the 587 nm, 667 nm, 706 nm, and 728 nm helium lines simultaneously for 32 channels with filter-photomultiplier tube arrays. Thus, the thermal helium beam diagnostic supplements the AUG edge diagnostics, offering fast and spatially highly resolved electron temperature and density profile measurements that cover the plasma edge and scrape-offmore »
- Authors:
-
- Max Planck Inst. for Plasma Physics, Garching (Germany); Technische Univ. München, Garching (Germany)
- Max Planck Inst. for Plasma Physics, Garching (Germany)
- Astro Fusion Spectre, LLC, San Diego, CA (United States)
- Univ.of Wisconsin, Madison, WI (United States)
- Publication Date:
- Research Org.:
- Univ. of Wisconsin, Madison, WI (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- Contributing Org.:
- ASDEX Upgrade Team
- OSTI Identifier:
- 1612110
- Alternate Identifier(s):
- OSTI ID: 1460030
- Grant/Contract Number:
- SC0014210; SC00013911
- 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; plasma diagnostics; polychromator; optical fibers; photomultipliers; helium; electron density; lenses; spectroscopy; plasma fluctuations; geometrical optics
Citation Formats
Griener, Michael, Wolfrum, E., Cavedon, M., Dux, R., Rohde, V., Sochor, M., Muñoz Burgos, J. M., Schmitz, O., and Stroth, U. Helium line ratio spectroscopy for high spatiotemporal resolution plasma edge profile measurements at ASDEX Upgrade (invited). United States: N. p., 2018.
Web. doi:10.1063/1.5034446.
Griener, Michael, Wolfrum, E., Cavedon, M., Dux, R., Rohde, V., Sochor, M., Muñoz Burgos, J. M., Schmitz, O., & Stroth, U. Helium line ratio spectroscopy for high spatiotemporal resolution plasma edge profile measurements at ASDEX Upgrade (invited). United States. https://doi.org/10.1063/1.5034446
Griener, Michael, Wolfrum, E., Cavedon, M., Dux, R., Rohde, V., Sochor, M., Muñoz Burgos, J. M., Schmitz, O., and Stroth, U. Thu .
"Helium line ratio spectroscopy for high spatiotemporal resolution plasma edge profile measurements at ASDEX Upgrade (invited)". United States. https://doi.org/10.1063/1.5034446. https://www.osti.gov/servlets/purl/1612110.
@article{osti_1612110,
title = {Helium line ratio spectroscopy for high spatiotemporal resolution plasma edge profile measurements at ASDEX Upgrade (invited)},
author = {Griener, Michael and Wolfrum, E. and Cavedon, M. and Dux, R. and Rohde, V. and Sochor, M. and Muñoz Burgos, J. M. and Schmitz, O. and Stroth, U.},
abstractNote = {The thermal helium beam edge diagnostic has recently been upgraded at the ASDEX Upgrade (AUG) tokamak experiment. Line ratio spectroscopy on neutral helium is a valuable tool for simultaneous determination of the electron temperature and density of plasmas. The diagnostic now offers a temporal resolution of 900 kHz with a spatial resolution of up to 3 mm at 32 lines of sight (LOS) simultaneously. The LOS covers a radial region of 8.5 cm, starting at the limiter radius and reaching into the confined region beyond the separatrix. Two components are of particular importance for the aforementioned hardware improvements. The first is the optical head, which collects the light from the experiment. Equipped with an innovative clamping system for optical fiber ends, an arbitrary distribution pattern of LOS can be achieved to gain radial and poloidal profiles. The second major development is a new polychromator system that measures the intensity of the 587 nm, 667 nm, 706 nm, and 728 nm helium lines simultaneously for 32 channels with filter-photomultiplier tube arrays. Thus, the thermal helium beam diagnostic supplements the AUG edge diagnostics, offering fast and spatially highly resolved electron temperature and density profile measurements that cover the plasma edge and scrape-off layer region. Plasma fluctuations, edge localized modes, filaments, and other turbulent structures are resolved, allowing analysis of their frequency and localization or their propagation velocity.},
doi = {10.1063/1.5034446},
journal = {Review of Scientific Instruments},
number = 10,
volume = 89,
place = {United States},
year = {Thu Jul 12 00:00:00 EDT 2018},
month = {Thu Jul 12 00:00:00 EDT 2018}
}
Web of Science
Works referenced in this record:
Fast piezoelectric valve offering controlled gas injection in magnetically confined fusion plasmas for diagnostic and fuelling purposes
journal, March 2017
- Griener, M.; Schmitz, O.; Bald, K.
- Review of Scientific Instruments, Vol. 88, Issue 3
Hybrid time dependent/independent solution for the He I line ratio temperature and density diagnostic for a thermal helium beam with applications in the scrape-off layer-edge regions in tokamaks
journal, January 2012
- Muñoz Burgos, J. M.; Schmitz, O.; Loch, S. D.
- Physics of Plasmas, Vol. 19, Issue 1
Avalanche photodiode based detector for beam emission spectroscopy
journal, October 2010
- Dunai, D.; Zoletnik, S.; Sárközi, J.
- Review of Scientific Instruments, Vol. 81, Issue 10
Comparison of He I line intensity ratio method and electrostatic probe for electron density and temperature measurements in NAGDIS-II
journal, January 2006
- Kajita, Shin; Ohno, Noriyasu; Takamura, Shuichi
- Physics of Plasmas, Vol. 13, Issue 1
Deployment and future prospects of high performance diagnostics featuring serial I/O (SIO) data acquisition (DAQ) at ASDEX Upgrade
journal, December 2012
- Behler, K.; Blank, H.; Eixenberger, H.
- Fusion Engineering and Design, Vol. 87, Issue 12
Blob properties in L- and H-mode from gas-puff imaging in ASDEX upgrade
journal, October 2014
- Fuchert, G.; Birkenmeier, G.; Carralero, D.
- Plasma Physics and Controlled Fusion, Vol. 56, Issue 12
Supersonic helium beam diagnostic for fluctuation measurements of electron temperature and density at the Tokamak TEXTOR
journal, June 2012
- Kruezi, U.; Stoschus, H.; Schweer, B.
- Review of Scientific Instruments, Vol. 83, Issue 6
Fast Thermal Helium Beam diagnostic for measurements of edge electron profiles and fluctuations
journal, December 2015
- Agostini, M.; Scarin, P.; Cavazzana, R.
- Review of Scientific Instruments, Vol. 86, Issue 12
Real-time diagnostics at ASDEX Upgrade—Architecture and operation
journal, April 2008
- Behler, K.; Blank, H.; Eixenberger, H.
- Fusion Engineering and Design, Vol. 83, Issue 2-3
Feasibility of line-ratio spectroscopy on helium and neon as edge diagnostic tool for Wendelstein 7-X
journal, September 2016
- Barbui, T.; Krychowiak, M.; König, R.
- Review of Scientific Instruments, Vol. 87, Issue 11
The Filterscope
journal, March 2003
- Colchin, R. J.; Hillis, D. L.; Maingi, R.
- Review of Scientific Instruments, Vol. 74, Issue 3
HELIOS: A helium line-ratio spectral-monitoring diagnostic used to generate high resolution profiles near the ion cyclotron resonant heating antenna on TEXTOR
journal, October 2012
- Unterberg, E. A.; Schmitz, O.; Fehling, D. H.
- Review of Scientific Instruments, Vol. 83, Issue 10
Qualification and implementation of line ratio spectroscopy on helium as plasma edge diagnostic at ASDEX Upgrade
journal, December 2017
- Griener, M.; Burgos, J. M. Muñoz; Cavedon, M.
- Plasma Physics and Controlled Fusion, Vol. 60, Issue 2
Invited Review Article: Gas puff imaging diagnostics of edge plasma turbulence in magnetic fusion devices
journal, April 2017
- Zweben, S. J.; Terry, J. L.; Stotler, D. P.
- Review of Scientific Instruments, Vol. 88, Issue 4
Works referencing / citing this record:
Dynamics of ideal modes and subsequent ELM crashes in 3D tokamak geometry from external magnetic perturbations
journal, November 2018
- Willensdorfer, M.; Cote, T. B.; Griener, M.
- Plasma Physics and Controlled Fusion, Vol. 61, Issue 1
Scrape-off layer transport and filament characteristics in high-density tokamak regimes
journal, October 2019
- Vianello, N.; Carralero, D.; Tsui, C. K.
- Nuclear Fusion, Vol. 60, Issue 1
Evaluation of emission contributions from charge-exchange between the excited states of deuterium with He + during diagnostic of thermal helium gas beam injection and laser-induced fluorescence
journal, June 2019
- Muñoz Burgos, J. M.; Griener, M.; Loreau, J.
- Physics of Plasmas, Vol. 26, Issue 6