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Relatively scaled ECE temperature profiles of KSTAR plasmas.
1Department of Physics, Pohang University of Science and Technology, Pohang, Gyungbuk 790-784, South Korea.
The Review of Scientific Instruments
|November 2, 2010
Summary
A new method scales electron cyclotron emission (ECE) temperature profiles from uncalibrated data using plasma movement. This technique offers a reliable alternative when absolute calibration is difficult or time-consuming.
Area of Science:
- Plasma physics
- Fusion energy research
- Diagnostic techniques
Background:
- Accurate electron temperature measurements are crucial for understanding plasma behavior in fusion devices.
- Electron Cyclotron Emission (ECE) is a powerful diagnostic for measuring plasma temperature.
- Absolute calibration of ECE radiometers can be challenging and time-consuming.
Purpose of the Study:
- To develop a method for obtaining relatively scaled electron temperature profiles from uncalibrated ECE radiometer data.
- To provide an alternative to absolute calibration for ECE diagnostics.
- To assess the applicability of the method to KSTAR tokamak plasmas.
Main Methods:
- Utilized a position-controlled system to move the plasma adiabatically.
- Compared ECE radiometer channels at identical relative radial positions during adiabatic plasma changes.
- Assumed profile consistency during adiabatic plasma movement for scaling.
Main Results:
- Successfully obtained relatively scaled electron temperature profiles from raw, uncalibrated ECE data.
- Demonstrated the method's effectiveness on 2009 KSTAR campaign plasmas.
- The proposed scaling method provides a viable alternative to absolute calibration.
Conclusions:
- The developed scaling scheme is a practical approach for deriving ECE temperature profiles when absolute calibration is unreliable.
- This method shows potential for application to complex ECE imaging data where calibration is particularly difficult.
- The technique enhances the utility of ECE diagnostics in fusion research.
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