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Title: Correlation electron cyclotron emission diagnostic and improved calculation of turbulent temperature fluctuation levels on ASDEX Upgrade

Abstract

A newly upgraded correlation electron cyclotron emission (CECE) diagnostic has been installed on the ASDEX Upgrade tokamak and has begun to perform experimental measurements of electron temperature fluctuations. CECE diagnostics measure small amplitude electron temperature fluctuations by correlating closely spaced heterodyne radiometer channels. This upgrade expanded the system from six channels to thirty, allowing simultaneous measurement of fluctuation level radial profiles without repeat discharges, as well as opening up the possibility of measuring radial turbulent correlation lengths. Newly refined statistical techniques have been developed in order to accurately analyze the fluctuation data collected from the CECE system. This paper presents here the hardware upgrades for this system and the analysis techniques used to interpret the raw data, as well as measurements of fluctuation spectra and fluctuation level radial profiles.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1];  [3];  [1];  [1];  [1];  [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). MIT Plasma Science and Fusion Center
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). MIT Plasma Science and Fusion Center; Max Planck Inst. for Plasma Physics, Garching (Germany)
  3. Max Planck Inst. for Plasma Physics, Garching (Germany)
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24); US Air Force Office of Scientific Research (AFOSR)
OSTI Identifier:
1526020
Alternate Identifier(s):
OSTI ID: 1436548
Grant/Contract Number:  
SC0006419; SC0017381; 32 CFR 168a
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 5; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Creely, A. J., Freethy, S. J., Burke, W. M., Conway, G. D., Leccacorvi, R., Parkin, W. C., Terry, D. R., and White, A. E. Correlation electron cyclotron emission diagnostic and improved calculation of turbulent temperature fluctuation levels on ASDEX Upgrade. United States: N. p., 2018. Web. doi:10.1063/1.5005507.
Creely, A. J., Freethy, S. J., Burke, W. M., Conway, G. D., Leccacorvi, R., Parkin, W. C., Terry, D. R., & White, A. E. Correlation electron cyclotron emission diagnostic and improved calculation of turbulent temperature fluctuation levels on ASDEX Upgrade. United States. doi:10.1063/1.5005507.
Creely, A. J., Freethy, S. J., Burke, W. M., Conway, G. D., Leccacorvi, R., Parkin, W. C., Terry, D. R., and White, A. E. Wed . "Correlation electron cyclotron emission diagnostic and improved calculation of turbulent temperature fluctuation levels on ASDEX Upgrade". United States. doi:10.1063/1.5005507. https://www.osti.gov/servlets/purl/1526020.
@article{osti_1526020,
title = {Correlation electron cyclotron emission diagnostic and improved calculation of turbulent temperature fluctuation levels on ASDEX Upgrade},
author = {Creely, A. J. and Freethy, S. J. and Burke, W. M. and Conway, G. D. and Leccacorvi, R. and Parkin, W. C. and Terry, D. R. and White, A. E.},
abstractNote = {A newly upgraded correlation electron cyclotron emission (CECE) diagnostic has been installed on the ASDEX Upgrade tokamak and has begun to perform experimental measurements of electron temperature fluctuations. CECE diagnostics measure small amplitude electron temperature fluctuations by correlating closely spaced heterodyne radiometer channels. This upgrade expanded the system from six channels to thirty, allowing simultaneous measurement of fluctuation level radial profiles without repeat discharges, as well as opening up the possibility of measuring radial turbulent correlation lengths. Newly refined statistical techniques have been developed in order to accurately analyze the fluctuation data collected from the CECE system. This paper presents here the hardware upgrades for this system and the analysis techniques used to interpret the raw data, as well as measurements of fluctuation spectra and fluctuation level radial profiles.},
doi = {10.1063/1.5005507},
journal = {Review of Scientific Instruments},
number = 5,
volume = 89,
place = {United States},
year = {2018},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

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Cited by: 2 works
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Figures / Tables:

FIG. 1 FIG. 1: Schematic block diagram of the new ASDEX Upgrade CECE system. There are twenty four fixed frequency bandpass channels and six tunable bandpass channels, for a total of thirty channels.

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