A new approach of equilibrium reconstruction for ITER

Imazawa, Ryota; Kawano, Y.; Kusama, Y.

doi:10.1088/0029-5515/51/11/113022

Cited by 29 publications

(28 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The difference between the numerical and the above two analysis solutions is that the numerical solution is the divertor configuration. This magnetic configuration was calculated by TOSCA code and has been used to develop the diagnostic design for ITER [16,17]. Fig.…”

Section: Input Modelmentioning

confidence: 99%

Meshless method for solving fixed boundary problem of plasma equilibrium

Imazawa

Kawano

Itami

2015

Journal of Computational Physics

View full text Add to dashboard Cite

Section: Input Modelmentioning

confidence: 99%

Meshless method for solving fixed boundary problem of plasma equilibrium

Imazawa

Kawano

Itami

2015

Journal of Computational Physics

View full text Add to dashboard Cite

“…[14] Step 2 Using ψ, the magnetic field, tentative n e and tentative T e , the Stokes equation is calculated to obtain the estimated values of the polarization state, Δθ E and Δε E (the suffix E denotes an "estimated" value).…”

Section: New Application Of Polarimetermentioning

confidence: 99%

Multiparameter measurement utilizing poloidal polarimeter for burning plasma reactor

Imazawa¹,

Kawano²,

Itami³

et al. 2014

AIP Conference Proceedings

View full text Add to dashboard Cite

The authors have made the basic and applied research on the polarimeter for plasma diagnostics. Recently, the authors have proposed an application of multiparameter measurement (magnetic field, B, electron density, n e , electron temperature, T e , and total plasma current, I p ) utilizing polarimeter to future fusion reactors. In this proceedings, the brief review of the polarimeter, the principle of the multiparameter measurement and the progress of the research on the multiparameter measurement are explained. The measurement method that the authors have proposed is suitable for the reactor for the following reasons; multiparameters can be obtained from a small number of diagnostics, the proposed method does not depend on time-history, and far-infrared light utilized by the polarimeter is less sensitive to degradation of of optical components. Taking into account the measuring error, performance assessment of the proposed method was carried. Assuming that the error of Δθ and Δε were 0.1 • and 0.6 • , respectively, the error of reconstructed j φ , n e and T e were 12 %, 8.4 % and 31 %, respectively. This study has shown that the reconstruction error can be decreased by increasing the number of the wavelength of the probing laser and by increasing the number of the viewing chords. For example, By increasing the number of viewing chords to forty-five, the error of j φ , n e and T e were reduced to 4.4 %, 4.4 %, and 17 %, respectively.

show abstract

“…1 The ITER poloidal polarimeter will use a far-infrared laser (wavelength is 119 µm) as a probing laser to measure both the Faraday effect and the Cotton-Mouton effect. 2 The Faraday effect rotates a polarization ellipse, and the Cotton-Mouton effect changes an ellipticity of the polarization ellipse. Thus, a method for measuring both an orientation angle and an ellipticity angle of a polarization state needs to be applied to the ITER poloidal polarimeter.…”

Section: Introductionmentioning

confidence: 99%

“…According to Ref. 2, the specifications of the accuracy enable the poloidal polarimeter to identify q-profile of ITER inductive scenario plasma with 10% accuracy. The accuracy includes all error sources such as calibration error and polarization change caused by invessel retro-reflector.…”

Section: Introductionmentioning

confidence: 99%

Development of real-time rotating waveplate Stokes polarimeter using multi-order retardation for ITER poloidal polarimeter

Imazawa

Kawano

Ono

et al. 2016

Review of Scientific Instruments

Self Cite

View full text Add to dashboard Cite

Faraday rotation measurements on compact helical system by using a phase sensitive heterodyne polarimeter Rev. Sci. Instrum. 70, 730 (1999); 10.1063/1.1149314 This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitationnew. The rotating waveplate Stokes polarimeter was developed for ITER (International Thermonuclear Experimental Reactor) poloidal polarimeter. The generalized model of the rotating waveplate Stokes polarimeter and the algorithm suitable for real-time field-programmable gate array (FPGA) processing were proposed. Since the generalized model takes into account each component associated with the rotation of the waveplate, the Stokes parameters can be accurately measured even in unideal condition such as non-uniformity of the waveplate retardation. Experiments using a He-Ne laser showed that the maximum error and the precision of the Stokes parameter were 3.5% and 1.2%, respectively. The rotation speed of waveplate was 20 000 rpm and time resolution of measuring the Stokes parameter was 3.3 ms. Software emulation showed that the real-time measurement of the Stokes parameter with time resolution of less than 10 ms is possible by using several FPGA boards. Evaluation of measurement capability using a far-infrared laser which ITER poloidal polarimeter will use concluded that measurement error will be reduced by a factor of nine. C 2016 AIP Publishing LLC.[http://dx

show abstract

A new approach of equilibrium reconstruction for ITER

Cited by 29 publications

References 22 publications

Meshless method for solving fixed boundary problem of plasma equilibrium

Meshless method for solving fixed boundary problem of plasma equilibrium

Multiparameter measurement utilizing poloidal polarimeter for burning plasma reactor

Development of real-time rotating waveplate Stokes polarimeter using multi-order retardation for ITER poloidal polarimeter

Contact Info

Product

Resources

About