Active beam spectroscopy diagnostics for ITER: Present status (invited)

Malaquias, A.; Hellermann, M. von; Tugarinov, S. N.; Lotte, P.; Hawkes, N.; Kuldkepp, Mattias; Rachlew, Elisabeth; Gorshkov, A. V.; Walker, Chris; Costley, A.E.; Vayakis, G.

doi:10.1063/1.1790041

Cited by 23 publications

(14 citation statements)

References 3 publications

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“…The optical properties and the thickness of the film strongly depend on the experimental conditions, the mirror material and the location of installation in the machine [61]. Experiments have shown that thin films (10 nm) of C-H or Be can strongly modify the reflectance of mirrors as well as its polarization characteristics [268,269]. The latter is of concern in particular for the important MSE diagnostics.…”

Section: Coatingmentioning

confidence: 99%

Diagnostics for steady state plasmas

Hartfuß¹,

König²,

Werner³

2006

Plasma Phys. Control. Fusion

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Problems related to the development of diagnostics for steady state fusion plasma experiments are being discussed. The paper concentrates on those necessities already appearing in nowadays non-burning plasma fusion experiments when extending pulse lengths beyond 10 s, i.e. thermal load, erosion, deposition, and long-time signal integration in magnetic diagnostics. Problems arising from high power ECRH under conditions of incomplete absorption are outlined. Individual standard diagnostic systems are discussed to identify their specific problems as well as the opportunities connected with long pulse operation. Burning plasma experiments characterized by intense n-and g-radiation are briefly reviewed for reasons of completeness, dealing with radiation induced processes in windows, fibres, cables, and mirrors. Methods of data handling, real time monitoring, and plasma control are outlined. Index

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Section: Coatingmentioning

confidence: 99%

Diagnostics for steady state plasmas

Hartfuß¹,

König²,

Werner³

2006

Plasma Phys. Control. Fusion

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“…This independence of polarization states is an advantage compared to MSE polarimetry especially in devices with high densities and temperatures, such as ITER. In ITER plasmas plasma facing mirrors are expected to be coated which can change the polarization state of the emitted light significantly [26][27][28] . Figures for the accuracy have been determined by systematic analyses of a well diagnosed plasma discharge at different heating scenarios, from comparisons with equilibrium modelling (CLISTE 2 ) and by comparison with independent measurements of the plasma pressure.…”

Section: Measurement Of the Magnetic Fieldmentioning

confidence: 99%

Spectrally resolved motional Stark effect measurements on ASDEX Upgrade

Reimer

Dinklage

Fischer

et al. 2013

Review of Scientific Instruments

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A spectrally resolved MSE diagnostic has been installed at ASDEX Upgrade. The MSE data have been fitted by a forward model providing access to information about the magnetic field in the plasma interior. The forward model for the beam emission spectra comprises also the fast ion D α (FIDA) signal and the smearing on the CCD-chip. The calculated magnetic field data as well as the revealed (dia)magnetic effects are consistent with the results from equilibrium reconstruction solver. Measurements of the direction of the magnetic field are affected by unknown and varying polarization effects in the observation.

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“…assessment of Motional Stark Effect [6] and Charge Exchange Recombination Spectroscopy [7] for ITER). Yet for turbulence diagnostics, detailed modeling using nonlinear gyrokinetic simulations has not been previously performed as part of a diagnostic design and feasibility study.…”

Section: Introductionmentioning

confidence: 99%

Feasibility study for a correlation electron cyclotron emission turbulence diagnostic based on nonlinear gyrokinetic simulations

White

Howard

Mikkelsen

et al. 2011

Plasma Phys. Control. Fusion

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Abstract. This paper describes the use of nonlinear gyrokinetic simulations to assess the feasibility of a new correlation electron cyclotron emission (CECE) diagnostic that has been proposed for the . The simulations are used to predict ranges of fluctuation level, peak poloidal wavenumber and radial correlation length of electron temperature fluctuations in the core of the plasma. The impact of antenna pattern and poloidal viewing location on measurable turbulence characteristics is addressed using synthetic diagnostics. An upper limit on the CECE sample volume size is determined. The modeling results show that a CECE diagnostic capable of measuring transport-relevant, long-wavelength (k θ ρ s < 0.5) electron temperature fluctuations is feasible at Alcator C-Mod.

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Active beam spectroscopy diagnostics for ITER: Present status (invited)

Cited by 23 publications

References 3 publications

Diagnostics for steady state plasmas

Diagnostics for steady state plasmas

Spectrally resolved motional Stark effect measurements on ASDEX Upgrade

Feasibility study for a correlation electron cyclotron emission turbulence diagnostic based on nonlinear gyrokinetic simulations

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