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Implementation of an in-vessel calibration light source for JET
T M Biewer1, C Belcher, I Hassall
1Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA. tmbiewer@ornl.gov
The Review of Scientific Instruments
|November 8, 2012
Summary
A new in-vessel calibration light source (ICLS) enables remote, in situ calibration of optical diagnostics at the Joint European Torus (JET). This method accurately calibrates diagnostic systems without removal, improving data reliability.
Area of Science:
- Fusion Energy Research
- Plasma Physics
- Optical Engineering
Background:
- Accurate calibration of optical diagnostics is crucial for fusion energy research.
- Traditional calibration methods required removing diagnostics from the Joint European Torus (JET), leading to downtime and potential misalignment.
- Extended shutdown periods presented an opportunity to implement novel in-situ calibration techniques.
Purpose of the Study:
- To implement and validate an in-vessel calibration light source (ICLS) for remote use at JET.
- To enable in-situ calibration of optical diagnostics, improving accuracy and efficiency.
- To account for optical path losses, including vignetting and viewport transmission, during calibration.
Main Methods:
- Development and implementation of an in-vessel calibration light source (ICLS).
- Remote operation of the ICLS during extended shutdown periods at JET.
- Calibration of optical diagnostics over their entire operational optical path.
Main Results:
- The ICLS successfully facilitated in-situ calibration for at least ten diagnostic systems.
- Calibration implicitly accounted for vignetting losses and vacuum window transmission.
- Enabled calibration without the need for diagnostic removal from the JET vessel.
Conclusions:
- The ICLS is an effective tool for remote, in-situ calibration of optical diagnostics at JET.
- This method enhances the accuracy and reliability of plasma discharge data.
- The ICLS significantly improves operational efficiency during shutdown periods.
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