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Title: Four-dimensional calibration turntable of the motional Stark effect diagnostic on EAST

Abstract

The motional Stark effect (MSE) diagnostic is applied to measure the safety factor q and current density profile of a tokamak device, which are important parameters in realizing the high-performance and long-pulse steady state of a tokamak. A single-channel MSE diagnostic based on dual photoelastic modulators, whose sightline meets with the neutral beam injection at a major radius of R = 2.12 m, has been built for the D window of the Experimental Advanced Superconducting Tokamak (EAST). According to the requirements of MSE diagnostic polarimetric calibration, a high-precision four-dimensional calibration turntable, driven by four stepping motors and controlled by software running on the computer, was designed for EAST. The turntable allows us to rapidly calibrate the MSE diagnostic in a series of positions and angles during EAST maintenance. The turntable can move in four dimensions of translation, yaw, pitch, and roll of the polarizer and can create linearly polarized light at any given angle with accuracy of ~0.05° for the MSE system offline calibration. As a result, the experimental results of the MSE diagnostic calibration in the laboratory show that the turntable has the advantages of high positioning accuracy, flexible spatial movement, and convenient control and fully meets the calibrationmore » requirements of an MSE diagnosis system.« less

Authors:
ORCiD logo [1];  [1];  [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2];  [3];  [4]; ORCiD logo [5];  [5];  [1]
  1. Hefei Univ. of Technology, Hefei (China)
  2. Chinese Academy of Sciences, Hefei (China)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. National Fusion Research Institute, Daejeon (South Korea)
  5. The Univ. of Texas at Austin, Austin, TX (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1545371
Grant/Contract Number:  
2015GB103003; 2015GB110005; 2014GB109114; AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 10; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

Huang, X., Liu, D. M., Liu, C., Fu, J., Wan, B. N., Lyu, B., Wu, Z. W., Holcomb, C. T., Ko, J., Rowan, W. L., Huang, H., and Miao, G. Z. Four-dimensional calibration turntable of the motional Stark effect diagnostic on EAST. United States: N. p., 2018. Web. doi:10.1063/1.5036938.
Huang, X., Liu, D. M., Liu, C., Fu, J., Wan, B. N., Lyu, B., Wu, Z. W., Holcomb, C. T., Ko, J., Rowan, W. L., Huang, H., & Miao, G. Z. Four-dimensional calibration turntable of the motional Stark effect diagnostic on EAST. United States. doi:10.1063/1.5036938.
Huang, X., Liu, D. M., Liu, C., Fu, J., Wan, B. N., Lyu, B., Wu, Z. W., Holcomb, C. T., Ko, J., Rowan, W. L., Huang, H., and Miao, G. Z. Tue . "Four-dimensional calibration turntable of the motional Stark effect diagnostic on EAST". United States. doi:10.1063/1.5036938. https://www.osti.gov/servlets/purl/1545371.
@article{osti_1545371,
title = {Four-dimensional calibration turntable of the motional Stark effect diagnostic on EAST},
author = {Huang, X. and Liu, D. M. and Liu, C. and Fu, J. and Wan, B. N. and Lyu, B. and Wu, Z. W. and Holcomb, C. T. and Ko, J. and Rowan, W. L. and Huang, H. and Miao, G. Z.},
abstractNote = {The motional Stark effect (MSE) diagnostic is applied to measure the safety factor q and current density profile of a tokamak device, which are important parameters in realizing the high-performance and long-pulse steady state of a tokamak. A single-channel MSE diagnostic based on dual photoelastic modulators, whose sightline meets with the neutral beam injection at a major radius of R = 2.12 m, has been built for the D window of the Experimental Advanced Superconducting Tokamak (EAST). According to the requirements of MSE diagnostic polarimetric calibration, a high-precision four-dimensional calibration turntable, driven by four stepping motors and controlled by software running on the computer, was designed for EAST. The turntable allows us to rapidly calibrate the MSE diagnostic in a series of positions and angles during EAST maintenance. The turntable can move in four dimensions of translation, yaw, pitch, and roll of the polarizer and can create linearly polarized light at any given angle with accuracy of ~0.05° for the MSE system offline calibration. As a result, the experimental results of the MSE diagnostic calibration in the laboratory show that the turntable has the advantages of high positioning accuracy, flexible spatial movement, and convenient control and fully meets the calibration requirements of an MSE diagnosis system.},
doi = {10.1063/1.5036938},
journal = {Review of Scientific Instruments},
number = 10,
volume = 89,
place = {United States},
year = {2018},
month = {8}
}

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