Electron kinetic effects on interferometry, polarimetry and Thomson scattering measurements in burning plasmas (invited)

Mirnov, V. V.; Brower, D. L.; Hartog, D. J. Den; Ding, W. X.; Duff, J.; Parke, E.

doi:10.1063/1.4891176

Cited by 12 publications

(42 citation statements)

References 15 publications

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“…In these works, the depolarisation effect is not taken into account and has not been studied in detail, even though it has been shown that the magnetic shear in a tokamak plays no role (Mazzucato 1998). This phenomenon is known in other domains of telecommunication (Tenouxa & Lostanlen 2012), space plasma Physics (Jandieri et al 2011) or laser plasma Physics (Javan & Adli 2013), and only recently in fusion in (Mirnov et al 2014). The polarisation changes have been studied in Astrophysics (Ledenev et al 2002).…”

Section: Contextmentioning

confidence: 99%

Simulation as a tool to improve wave heating in fusion plasmas

et al. 2015

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(Received ?; revised ?; accepted ?. -To be entered by editorial office)Firstly, a brief overview will be given on different models that are able to describe the behaviour of wave propagation as a function of specific frequency ranges. Each range corresponds to different heating systems, namely, 20-100 MHz for the Ion Cyclotron Resonant Heating (ICRH), 2-20 GHz for Lower Hybrid Heating or Current Drive (LHCD), and 100-250 GHz for Electron Cyclotron Resonant Heating (ERCH) or Current Drive (ECCD) systems. Every systems' specifications will be explained in detail, including the typical set of equations and the assumptions needed to describe the properties of these heating or current drive systems, as well as their specific domains of validity. In these descriptions, special attention will be paid to the boundary conditions. A review about specific physical problems associated with the wave heating systems will also be provided. Such review will detail the role of simulation in answering questions coming from experiments on magnetized plasma devices devoted to Fusion. A few examples which will be covered are the impact of edge turbulence on wave propagation and its consequences on the heating system performances, effects of the fast particles, ponderomotive effects, among others. A study that is more focused on Radio Frequency (RF) sheath effects will also be discussed. It shows that such simulations require very sophisticated tools to gain a partial understanding of the observations undertaken in dedicated experiments. To conclude this review, an overview will be given about the requirements and progress necessary to obtain relevant predictive simulation tools able to describe the wave heating systems used in fusion devices.

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Section: Contextmentioning

confidence: 99%

Simulation as a tool to improve wave heating in fusion plasmas

et al. 2015

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“…Reference [10] was built on this previous work and presented exact analytical relativistic solutions for the frequencyintegrated Mueller matrix elements. This result was applied to the LIDAR ITER Thomson scattering system.…”

Section: Introductionmentioning

confidence: 99%

“…The analytical solutions enable optimization of a polarization-based TS diagnostic setup over multidimensional parameter space. These solutions were used to study the general properties of the degree of depolarization in a wide range of T e and scattering angle θ variations [11,12]. Possible implementations of a polarization-based T e diagnostic were discussed in [13].…”

Section: Introductionmentioning

confidence: 99%

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Polarization of incoherent Thomson scattering for electron temperature measurement

Mirnov

Hartog

2017

Plasma Phys. Control. Fusion

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This paper reviews the polarization properties of Thomson scattered (TS) light as applied to electron temperature measurement. The theoretical background is based on Stokes vector transformations and Mueller matrices. The review starts from scattering on a single electron and proceeds to the combined effect of many particles. Then, this general approach is subdivided into frequency-integrated and frequency-resolved applications. For each of them, the exact relativistic analytical solutions are presented in the form of Mueller matrix elements averaged over the relativistic Maxwellian distribution function. The dependencies of the elements on the scattering angle, electron temperature, and frequency of the scattered radiation (in the frequency-resolved case) are presented. These solutions form the basis for accurate analysis of the degree of depolarization of TS radiation. Results obtained for the frequency-integrated regime are reviewed and new solutions for the frequency-resolved case are reported, making a bridge between the two limiting cases. Experimental setups for polarization-based TS diagnostics are compared. A combination of polarization-based and spectral-based techniques are also described.

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“…The values shown in table 10 are calculated including the relativistic corrections related to the plasma temperatures typical of the ITER and DEMO [31]. The theory derived in [32] was used.…”

Section: Measurement Of Electron Density By Interferometry-mentioning

confidence: 99%

Diagnostics and control for the steady state and pulsed tokamak DEMO

Orsitto¹,

Villari²,

Moro³

et al. 2016

Nucl. Fusion

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The present paper is devoted to a first assessment of the DEMO diagnostics systems and controls in the context of pulsed and steady state reactor design under study in Europe. In particular, the main arguments treated are: (i) The quantities to be measured in DEMO and the requirements for the measurements; (ii) the present capability of the diagnostic and control technology, determining the most urgent gaps, and (iii) the program and strategy of the research and development (R&D) needed to fill the gaps. Burn control, magnetohydrodynamic stability, and basic machine protection require improvements to the ITER technology, and moderated efforts in R&D can be dedicated to infrared diagnostics (reflectometry, electron cyclotron emission, polarimetry) and neutron diagnostics. Metallic Hall sensors appear to be a promising candidate for magnetic measurements in the high neutron fluence and long/steady state discharges of DEMO.

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Electron kinetic effects on interferometry, polarimetry and Thomson scattering measurements in burning plasmas (invited)

Cited by 12 publications

References 15 publications

Simulation as a tool to improve wave heating in fusion plasmas

Simulation as a tool to improve wave heating in fusion plasmas

Polarization of incoherent Thomson scattering for electron temperature measurement

Diagnostics and control for the steady state and pulsed tokamak DEMO

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