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Temperature gradient scale length measurement: A high accuracy application of electron cyclotron emission without
S Houshmandyar1, Z J Yang2, P E Phillips1
1Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712, USA.
Abstract:
Calibration is a crucial procedure in electron temperature (Te) inference from a typical electron cyclotron emission (ECE) diagnostic on tokamaks. Although the calibration provides an important multiplying factor for an individual ECE channel, the parameter ΔTe/Te is independent of any calibration. Since an ECE channel measures the cyclotron emission for a particular flux surface, a non-perturbing change in toroidal magnetic field changes the view of that channel. Hence the calibration-free parameter is a measure of Te gradient. BT-jog technique is presented here which employs the parameter and the raw ECE signals for direct measurement of electron temperature gradient scale length.
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