Helium line ratio spectroscopy for high spatiotemporal resolution plasma edge profile measurements at ASDEX Upgrade (invited)

Griener, Michael; Wolfrum, E.; Cavedon, M.; Dux, R.; Rohde, V.; Sochor, M.; Muñoz Burgos, J. M.; Schmitz, O.; Stroth, U.

doi:10.1063/1.5034446

Title: Helium line ratio spectroscopy for high spatiotemporal resolution plasma edge profile measurements at ASDEX Upgrade (invited)

Journal Article · Thu Jul 12 00:00:00 EDT 2018 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.5034446· OSTI ID:1612110

^[1]; Wolfrum, E. ^[2]; Cavedon, M. ^[2]; Dux, R. ^[2]; Rohde, V. ^[2]; Sochor, M. ^[2];

^[3];

^[4]; Stroth, U. ^[1]

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)

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.

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Research Organization:: Univ. of Wisconsin, Madison, WI (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Contributing Organization:: ASDEX Upgrade Team

Grant/Contract Number:: SC0014210; SC00013911

OSTI ID:: 1612110

Alternate ID(s):: OSTI ID: 1460030

Journal Information:: Review of Scientific Instruments, Vol. 89, Issue 10; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 32 works

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References (14)

Fast piezoelectric valve offering controlled gas injection in magnetically confined fusion plasmas for diagnostic and fuelling purposes Griener, M.; Schmitz, O.; Bald, K. Review of Scientific Instruments, Vol. 88, Issue 3 https://doi.org/10.1063/1.4978629	journal	March 2017
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 Muñoz Burgos, J. M.; Schmitz, O.; Loch, S. D. Physics of Plasmas, Vol. 19, Issue 1 https://doi.org/10.1063/1.3672230	journal	January 2012
Avalanche photodiode based detector for beam emission spectroscopy Dunai, D.; Zoletnik, S.; Sárközi, J. Review of Scientific Instruments, Vol. 81, Issue 10 https://doi.org/10.1063/1.3488458	journal	October 2010
Comparison of He I line intensity ratio method and electrostatic probe for electron density and temperature measurements in NAGDIS-II Kajita, Shin; Ohno, Noriyasu; Takamura, Shuichi Physics of Plasmas, Vol. 13, Issue 1 https://doi.org/10.1063/1.2164461	journal	January 2006
Deployment and future prospects of high performance diagnostics featuring serial I/O (SIO) data acquisition (DAQ) at ASDEX Upgrade Behler, K.; Blank, H.; Eixenberger, H. Fusion Engineering and Design, Vol. 87, Issue 12 https://doi.org/10.1016/j.fusengdes.2012.09.020	journal	December 2012
Blob properties in L- and H-mode from gas-puff imaging in ASDEX upgrade Fuchert, G.; Birkenmeier, G.; Carralero, D. Plasma Physics and Controlled Fusion, Vol. 56, Issue 12 https://doi.org/10.1088/0741-3335/56/12/125001	journal	October 2014
Supersonic helium beam diagnostic for fluctuation measurements of electron temperature and density at the Tokamak TEXTOR Kruezi, U.; Stoschus, H.; Schweer, B. Review of Scientific Instruments, Vol. 83, Issue 6 https://doi.org/10.1063/1.4707150	journal	June 2012
Fast Thermal Helium Beam diagnostic for measurements of edge electron profiles and fluctuations Agostini, M.; Scarin, P.; Cavazzana, R. Review of Scientific Instruments, Vol. 86, Issue 12 https://doi.org/10.1063/1.4939003	journal	December 2015
Real-time diagnostics at ASDEX Upgrade—Architecture and operation Behler, K.; Blank, H.; Eixenberger, H. Fusion Engineering and Design, Vol. 83, Issue 2-3 https://doi.org/10.1016/j.fusengdes.2008.01.015	journal	April 2008
Feasibility of line-ratio spectroscopy on helium and neon as edge diagnostic tool for Wendelstein 7-X Barbui, T.; Krychowiak, M.; König, R. Review of Scientific Instruments, Vol. 87, Issue 11 https://doi.org/10.1063/1.4962989	journal	September 2016
The Filterscope Colchin, R. J.; Hillis, D. L.; Maingi, R. Review of Scientific Instruments, Vol. 74, Issue 3 https://doi.org/10.1063/1.1537038	journal	March 2003
HELIOS: A helium line-ratio spectral-monitoring diagnostic used to generate high resolution profiles near the ion cyclotron resonant heating antenna on TEXTOR Unterberg, E. A.; Schmitz, O.; Fehling, D. H. Review of Scientific Instruments, Vol. 83, Issue 10 https://doi.org/10.1063/1.4739236	journal	October 2012
Qualification and implementation of line ratio spectroscopy on helium as plasma edge diagnostic at ASDEX Upgrade Griener, M.; Burgos, J. M. Muñoz; Cavedon, M. Plasma Physics and Controlled Fusion, Vol. 60, Issue 2 https://doi.org/10.1088/1361-6587/aa97e8	journal	December 2017
Invited Review Article: Gas puff imaging diagnostics of edge plasma turbulence in magnetic fusion devices Zweben, S. J.; Terry, J. L.; Stotler, D. P. Review of Scientific Instruments, Vol. 88, Issue 4 https://doi.org/10.1063/1.4981873	journal	April 2017

Cited By (3)

Dynamics of ideal modes and subsequent ELM crashes in 3D tokamak geometry from external magnetic perturbations Willensdorfer, M.; Cote, T. B.; Griener, M. Plasma Physics and Controlled Fusion, Vol. 61, Issue 1 https://doi.org/10.1088/1361-6587/aadc39	journal	November 2018
Scrape-off layer transport and filament characteristics in high-density tokamak regimes Vianello, N.; Carralero, D.; Tsui, C. K. Nuclear Fusion, Vol. 60, Issue 1 https://doi.org/10.1088/1741-4326/ab423e	journal	October 2019
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 Muñoz Burgos, J. M.; Griener, M.; Loreau, J. Physics of Plasmas, Vol. 26, Issue 6 https://doi.org/10.1063/1.5088363	journal	June 2019

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47 OTHER INSTRUMENTATION
instruments & instrumentation
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Title: Helium line ratio spectroscopy for high spatiotemporal resolution plasma edge profile measurements at ASDEX Upgrade (invited)

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