Imaging charge exchange recombination spectroscopy on the TEXTOR tokamak

Howard, J.; Jaspers, Rje Roger; Lischtschenko, O.; Delabie, E.; Chung, Jae-Hoon

doi:10.1088/0741-3335/52/12/125002

Cited by 11 publications

(15 citation statements)

References 10 publications

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“…Following Doppler CIS instruments used on other devices, 2,6 the MAST instrument uses a static polarisationbased interferometer, in which orthogonal polarisation states act as the two interferometer beams and share a common physical beam path. This makes the system compact, easy to align, and relatively robust to mechanical disturbance.…”

Section: Hardwarementioning

confidence: 99%

“…5 Note that due to this line shape sensitivity, the contrast varies with ion temperature for Doppler broadened lines and can be used as a T i diagnostic. 3,6,8 However, this complicates the interpretation of the fringe phase images, thus to optimise for flow measurements we choose a delay where the contrast is relatively insensitive to T i . Based on modelling of ζ for the measured multiplet line structures, a delay plate thickness of L = 6.5 mm was chosen as a good compromise between maximising ζ , maximising the phase sensitivity to flows, and minimising T i sensitivity for all three spectral lines.…”

Section: Hardwarementioning

confidence: 99%

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Coherence imaging of scrape-off-layer and divertor impurity flows in the Mega Amp Spherical Tokamak (invited)

Silburn

Harrison

Howard

et al. 2014

Review of Scientific Instruments

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. A new coherence imaging Doppler spectroscopy diagnostic has been deployed on the UK's Mega Amp Spherical Tokamak for scrape-off-layer and divertor impurity flow measurements. The system has successfully obtained 2D images of C III, C II, and He II line-of-sight flows, in both the lower divertor and main scrape-off-layer. Flow imaging has been obtained at frame rates up to 1 kHz, with flow resolution of around 1 km/s and spatial resolution better than 1 cm, over a 40 • field of view. C III data have been tomographically inverted to obtain poloidal profiles of the parallel impurity flow in the divertor under various conditions. In this paper we present the details of the instrument design, operation, calibration, and data analysis as well as a selection of flow imaging results which demonstrate the diagnostic's capabilities.

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Section: Hardwarementioning

confidence: 99%

Section: Hardwarementioning

confidence: 99%

Coherence imaging of scrape-off-layer and divertor impurity flows in the Mega Amp Spherical Tokamak (invited)

Silburn

Harrison

Howard

et al. 2014

Review of Scientific Instruments

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“…This is much higher than the time resolution of Doppler CIS systems viewing SOL on other conventional tokamaks. 24,29,39 This feature allows for timeresolved 2D measurements in short-time phenomena on the HL-2A tokamak, such as ELMs.…”

Section: Review Of Scientific Instrumentsmentioning

confidence: 99%

“…12 CIS techniques have been applied on various magnetic confinement devices, including linear device, 18 dipole device, 19 stellarators, [20][21][22] and tokamaks. [23][24][25][26][27][28][29] Doppler CIS measurements on the MAST tokamak show that counter-streaming flows of impurities 28 due to gas puffing increase the pressure on field lines. These results are reproduced by EMC3-EIRENE simulations.…”

Section: Introductionmentioning

confidence: 99%

Doppler coherence imaging of scrape-off-layer impurity flows in the HL-2A tokamak

Long

Allcock

Nie

et al. 2020

Review of Scientific Instruments

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The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.

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“…Doppler "coherence imaging" systems are deployed on many devices around the world. In particular, these systems have revealed the structure of impurity ion flows in the divertor and scrapeoff-layer (SOL) regions of the DIII-D and MAST tokamaks [4,5] and been deployed for charge exchange recombination spectroscopy on the TEXTOR tokamak [6]. We discuss the optical principles and instrumental details in section 2 and present new results of synchronous Doppler imaging of instabilities on a linear magnetized plasma with flow velocity resolution ∼ 1 m/s in section 3.…”

Section: Introductionmentioning

confidence: 99%

Spectro-polarimetrc optical systems for imaging plasma internal fields, structures and flows

et al. 2015

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Spectro-polarimetric imaging systems have opened new and better ways to study the spatio-temporal behaviour of plasma properties including current distribution, pedestal fields and the velocity distribution function of radiating species from the plasma edge to the core. Using spatial-heterodyne polarimetric techniques, these coherence-imaging (CI) systems have been deployed for motional Stark effect (MSE) imaging and charge-exchange Doppler imaging (CXRS) on KSTAR and ASDEX-Upgrade, and for passive Doppler spectroscopy of the plasma edge on DIII-D and MAST. They have also been used for Doppler imaging of low-temperature argon discharges on the linear mirror device MAGPIE at the ANU, including synchronous Doppler imaging of flow vortices associated with low frequency instabilities. We describe the diagnostic technologies, discuss the results and comparisons with simple models, and consider new applications and future developments.

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Imaging charge exchange recombination spectroscopy on the TEXTOR tokamak

Cited by 11 publications

References 10 publications

Coherence imaging of scrape-off-layer and divertor impurity flows in the Mega Amp Spherical Tokamak (invited)

Coherence imaging of scrape-off-layer and divertor impurity flows in the Mega Amp Spherical Tokamak (invited)

Doppler coherence imaging of scrape-off-layer impurity flows in the HL-2A tokamak

Spectro-polarimetrc optical systems for imaging plasma internal fields, structures and flows

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