Ultrasoft x-ray spectroscopy using multilayer mirrors on TCV

Piffl, V.; Weisen, H.; Zabolotsky, A.; Team, the TCV

doi:10.1088/0741-3335/46/11/001

Cited by 2 publications

(1 citation statement)

References 26 publications

(30 reference statements)

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“…The impurity transport code STRAHL calculates the radial density and radiation distributions of impurity in the core plasma, which has been applied to many fusion devices, including AUG [43], TCV [44], ADITYA [45], HL-2A [46], EAST [47,48], DIII-D [49]. The STRAHL code solves a coupled impurity particle conservation equation for each ionization stage [50,51],…”

Section: Strahl Modellingmentioning

confidence: 99%

Evaluation of edge transport and core accumulation of tungsten for CFETR with EMC3-EIRENE and STRAHL

Liu¹,

Dai²,

Yang³

et al. 2022

Nucl. Fusion

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The edge transport and core accumulation of tungsten (W) particles on CFETR have been studied by integrated modelling consisting of EMC3-EIRENE and STRAHL codes. The edge transport and power dissipation of W particles are simulated by EMC3-EIRENE. An in-out asymmetry of W(1-28)+ ions density has been revealed in the in- and out-board divertor regions. This is mainly due to the stronger reversal flow velocity of W ions at the outboard divertor. The upward flow of W ions near the separatrix leads to a moderate W impurity leakage from the divertor on CFETR compared to the existing full W device ASDEX Upgrade due to the high plasma density near the CFETR divertor targets. Further, the density distribution and radiation loss of W ions in the core region are investigated by STRAHL code. The high charge-state W(29-60)+ and W(61-74)+ ions mainly reside in the regions of Ψ_N = 0.20~0.98 and 0.00~0.90 (Ψ_N is the normalized poloidal magnetic flux), respectively. The W induced energy dissipation in different regions is assessed according to both STRAHL and EMC3-EIRENE simulations. Particularly, the impacts of the W core radiation on the operation regime are discussed according to the H-mode threshold scaling law proposed by Martin [Martin Y R et al 2008 J. Phys.: Conf. Ser. 123 012033] for the baseline plasma on CFETR. Further, parameter studies on the pinch velocity (v_imp) and diffusion coefficient (D_imp) have been performed to check their impacts on the operation regime of CFETR. A three-fold increase of v_imp/D_imp results in a higher W core energy loss, which can lead to the transition from H-mode back to L-mode.

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Section: Strahl Modellingmentioning

confidence: 99%

Evaluation of edge transport and core accumulation of tungsten for CFETR with EMC3-EIRENE and STRAHL

Liu¹,

Dai²,

Yang³

et al. 2022

Nucl. Fusion

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Neutral particle analyzer diagnostics on the TCV tokamak

Karpushov

Duval

Schlatter

et al. 2006

Review of Scientific Instruments

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Articles you may be interested inCompact, accurate description of diagnostic neutral beam propagation and attenuation in a high temperature plasma for charge exchange recombination spectroscopy analysisa) Rev. Sci. Instrum. 79, 10F315 (2008); Neutral beam diagnostics for the HT-7 tokamak Rev. Sci. Instrum. 75, 3496 (2004); 10.1063/1.1787952Plasma potential profile determination by a new diagnostic based on neutral particle beam injection and laser induced fluorescence Rev. Sci. Instrum. 70, 908 (1999); Experimental apparatus and data analysis techniques used in neutral particle analyzer ͑NPA͒ diagnostics on the Tokamak à Configuration Variable ͑TCV͒ are described. Two NPAs are used on TCV to measure the energy spectrum of neutral particle fluxes from the plasma. The "five-channel energy analyzer of atomic particles" used in double electrical analysis mode with fast voltage sweeping detect particles without atomic mass discrimination in the energy range of 0.6-8.0 keV with a time resolution of 0.5-2.0 ms and an energy resolution of 7%-20%. The 28-channel "compact neutral particle analyzer" ͑CNPA͒ is an EIIB spectrometer with mass and energy separations designed for medium sized fusion machines featuring a carbon neutral stripping foil, a permanent magnet for dispersion, and channel-electron multiplier detectors. The CNPA simultaneously detects two mass species ͓hydrogen ͑H͒ and deuterium ͑D͒ or D and helium ͑He͔͒ in the 0.5-50 keV energy range with a resolution of 60%-10% and a time resolution of 0.5-4.0 ms. The CNPA views the plasma across the path of the diagnostic neutral beam and can perform active charge-exchange NPA measurement. Data analysis procedures and numerical algorithms developed for NPA measurement are routinely used on TCV to obtain information on the plasma ion temperature, ion energy distribution function, plasma isotope ratios, and other plasma characteristics.

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Ultrasoft x-ray spectroscopy using multilayer mirrors on TCV

Cited by 2 publications

References 26 publications

Evaluation of edge transport and core accumulation of tungsten for CFETR with EMC3-EIRENE and STRAHL

Evaluation of edge transport and core accumulation of tungsten for CFETR with EMC3-EIRENE and STRAHL

Neutral particle analyzer diagnostics on the TCV tokamak

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