Upgrade of the ECE diagnostic on EAST

The electron cyclotron emission (ECE) diagnostic on the experimental advanced superconducting tokamak (EAST) was upgraded recently to provide electron temperature profile measurement with wider radial coverage and better precision. The lower limit of the ECE detection frequency band was extended fro...

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Bibliographic Details
Published in:Review of scientific instruments 2018-10, Vol.89 (10), p.10H111-10H111
Main Authors: Zhao, Hailin, Zhou, Tianfu, Liu, Yong, Ti, Ang, Ling, Bili, Austin, M. E., Houshmandyar, Saeid, Huang, H., Rowan, W. L., Hu, Liqun
Format: Article
Language:English
Subjects:
Cyclotrons
Diagnostic systems
Electron energy
Fluid dynamics
Fluid flow
Magnetohydrodynamics
Profile measurement
Radiometers
Scientific apparatus & instruments
Tearing modes (plasmas)
Temperature gradients
Tokamak devices
Yttrium
Yttrium-iron garnet
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Summary:The electron cyclotron emission (ECE) diagnostic on the experimental advanced superconducting tokamak (EAST) was upgraded recently to provide electron temperature profile measurement with wider radial coverage and better precision. The lower limit of the ECE detection frequency band was extended from 104 GHz to 97 GHz by adding a new 8-channel heterodyne radiometer, which ensures capability for the measurement of the second harmonic ECE with toroidal magnetic field down to 1.75 T. Also, the existing 32-channel heterodyne radiometer has been upgraded, with the frequency interval for the lower frequency range up to 120 GHz reduced from 2 GHz to 1 GHz by introducing eight channels in the intermediate frequency part. In addition, a plan is presented to incorporate tunable yttrium iron garnet filters into the existing heterodyne radiometer to obtain detailed measurements of the electron temperature gradient scale length as well as finer spatial pinpointing of magnetohydrodynamic modes. Examples from DIII-D are provided where similar ECE diagnostic allowed precise measurement of the center and width of neoclassical tearing modes.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.5035452