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

The high-frequency noise measured by magnetic sensors, at levels above the typical frequency of resistive wall modes, is analyzed across a range of present tokamak devices including DIII-D, JET, MAST, ASDEX Upgrade, JT-60U, and NSTX. 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 plasma operation of the high-frequency noise component of the sensor signals, to be used for resistive wall mode feedback stabilization, based on the multimachine database. The predicted root-mean-square n = 1 (n is the toroidal mode number) noise level is 10 4 to 10 5 G/s for the voltage signal, and 0.1 to 1 G for the perturbed magnetic field signal. The lower cutoff frequency of the Gaussian pickup noise scales linearly with the sampling frequency, with a scaling coefficient of about 0.1. As a result, these basic noise characteristics should be useful for the modeling-based design of the feedback control system for the resistive wall mode in ITER.
Authors:
ORCiD logo [1] ;  [2] ;  [3] ;  [3] ;  [4] ;  [3] ;  [5] ;  [5] ;  [6] ;  [7] ;  [8]
  1. Culham Science Centre, Abingdon (United Kingdom); Southwest Institute of Physics, Chengdu (China); Chalmers Univ. of Technology, Gothenburg (Sweden)
  2. Columbia Univ., New York, NY (United States)
  3. Culham Science Centre, Abingdon (United Kingdom)
  4. ITER Organization, St. Paul Lez Durance Cedex (France)
  5. Max Planck Inst. for Plasma Physics, Garching (Germany)
  6. Japan Atomic Energy Agency, Ibaraki (Japan)
  7. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  8. General Atomics, San Diego, CA (United States)
Publication Date:
Grant/Contract Number:
AC02-09CH11466; FC02-04ER54698; FG02-99ER54524
Type:
Accepted Manuscript
Journal Name:
Fusion Science and Technology
Additional Journal Information:
Journal Volume: 70; Journal Issue: 3; Journal ID: ISSN 1536-1055
Publisher:
American Nuclear Society
Research Org:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); General Atomics, San Diego, CA (United States)
Sponsoring Org:
USDOE
Contributing Orgs:
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
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; sensor noise; resistive wall mode; diii-d tokamak; feedback stabilization; plasma rotation; active; feedback; external-modes; RMW
OSTI Identifier:
1376866
Alternate Identifier(s):
OSTI ID: 1340286