Multimachine data–based prediction of high-frequency sensor signal noise for resistive wall mode control in ITER

Liu, Yueqiang; Sabbagh, S. A.; Chapman, I. T.; Gerasimov, S.; Gribov, Y.; Hender, T. C.; Igochine, V.; Maraschek, M.; Matsunaga, G.; Okabayashi, M.; Strait, E. J.

doi:10.13182/fst15-207

Title: Multimachine data–based prediction of high-frequency sensor signal noise for resistive wall mode control in ITER

Journal Article · Mon Mar 27 00:00:00 EDT 2017 · Fusion Science and Technology

DOI:https://doi.org/10.13182/fst15-207· OSTI ID:1340286

^[1]; Sabbagh, S. A. ^[2]; Chapman, I. T. ^[3]; Gerasimov, S. ^[3]; Gribov, Y. ^[4]; Hender, T. C. ^[3]; Igochine, V. ^[5]; Maraschek, M. ^[5]; Matsunaga, G. ^[6]; Okabayashi, M. ^[7]; Strait, E. J. ^[8]

Culham Science Centre, Abingdon (United Kingdom); Southwest Institute of Physics, Chengdu (China); Chalmers Univ. of Technology, Gothenburg (Sweden)
Columbia Univ., New York, NY (United States)
Culham Science Centre, Abingdon (United Kingdom)
ITER Organization, St. Paul Lez Durance Cedex (France)
Max Planck Inst. for Plasma Physics, Garching (Germany)
Japan Atomic Energy Agency, Ibaraki (Japan)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
General Atomics, San Diego, CA (United States)

The high frequency noise, above the frequency of typical resistive wall modes, from magnetic pickup coils is analysed across a range of present tokamak devices including DIII-D, JET, MAST, ASDEX Upgrade, JT-60U and NSTX. Application of a high-pass filter enables identification of the noise component with Gaussian-like statistics, that shares certain common characteristics in all devices considered. A conservative prediction is made for ITER plasmas based on the multi-machine database, for the high-frequency noise component of the sensor signals, for the purpose of feedback stabilisation of the resistive wall mode. The predicted root-mean-square n=1 (n is the toroidal mode number) noise level is 104 -105Gauss/second for the voltage signal, and 0.1-1Gauss for the perturbed magnetic field signal. The lower cutoff frequency of the Gaussian pickup noise scales linearly with the sampling frequency, with the scaling coefficient of about 0.1. These basic noise characteristics should be useful for the modelling based design of the feedback control system for the resistive wall mode in ITER.

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Research Organization:: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: CCFE, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England.; Southwestern Inst Phys, POB 432, Chengdu 610041, Peoples R China.; Chalmers, Dept Earth & Space Sci, SE-41296 Gothenburg, Sweden; Columbia Univ, Dept Appl Phys & Appl Math, New York, NY 10027 USA; .ITER Org, Route Vinon Verdon,CS90046, F-13067 St Paul Les Durance, France; Max Planck Inst Plasma Phys, Boltzmannstr 2, D-85748 Garching, Germany; Japan Atom Energy Agcy, 801-1 Mukouyama, Naka, Ibaraki 3110193, Japan

Grant/Contract Number:: AC02-09CH11466; FC02-04ER54698; FG02-99ER54524

OSTI ID:: 1340286

Alternate ID(s):: OSTI ID: 1376866

Journal Information:: Fusion Science and Technology, Vol. 70, Issue 3; ISSN 1536-1055

Publisher:: American Nuclear SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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Title: Multimachine data–based prediction of high-frequency sensor signal noise for resistive wall mode control in ITER

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