2nd Microwave Calibration Workshop

Contribution List

4. Absolute Calibration Procedure of the ECE Radiometer at WEST

Samuele Mazzi (CEA Cadarache)

In this contribution, we describe the absolute calibration procedure of the heterodyne radiometer at WEST for the measurement of the Electron Cyclotron Emission (ECE). The ECE radiometer [1] at WEST has 32 channels, with a purely horizontal line-of-sight, and can operate in both O-mode fundamental or X-mode 2nd harmonic, depending on the toroidal magnetic field intensity. The corresponding...

6. Continuous Ultrafast Sampling for CTS: Implementation and Consequences for ITER Calibration

Theo Verdier (DTU - Technical University of Denmark)

Collective Thomson Scattering (CTS) diagnostics require high signal fidelity, temporal coverage, and calibration robustness, particularly looking ahead toward long-pulse and steady-state fusion devices. Until 2024, the CTS fast-digitization chain employed at ASDEX Upgrade (AUG) was limited by a duty cycle below 6% over 10 s, constraining both temporal continuity and the statistical quality of...

2. Optimization of the Magnetic Difference Calibration Method on HL-3 Tokamak

xin yu

Blackbody In-Situ Calibration is the standard calibration method for Electron Cyclotron Emission (ECE) diagnostics, but it poses risks of performance degradation or even failure under future deuterium-tritium (DT) environments. To offer more ECE calibration methods, the Magnetic Difference Calibration Method (MDM) was developed on the HL-3 Tokamak, which reduces the risk of failure. Based on...

5. Performance Estimate for the ITER ECE High Frequency Radiometer

William Rowan (University of Texas at Austin, The (US))

The ITER High Frequency Radiometer (HFR) is designed to measure electron temperature and to detect neoclassical tearing modes in real time. In addition, it will provide numerous support measurements including detection of ELMS and MHD modes. A unique feature of the system is an in-situ calibration tool -- a hot source operating at 700 C -- which is needed to account for gradual degradation of...

1. Preliminary calibration plans for the electron cyclotron emission profile radiometer on the SPARC tokamak

Christian Yoo (Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA)

SPARC [1] is a high-field (12T), superconducting, D-T tokamak under development by Commonwealth Fusion Systems. SPARC aims to demonstrate a fusion gain (Q) > 1, with projections to reach Q ~ 11 in high-performance plasmas [1]. An electron cyclotron emission (ECE) radiometer will provide kinetic profile measurements important for thermal stored energy measurements and verifying fusion gain as...

3. Sensitivity Estimation for ITER ECE FTS Systems

Johannes van den Berg (ITER Organization (IO))

The Fourier-Transform Spectrometers (FTS) planned for ITER measure broadband Electron Cyclotron Emission (ECE) for plasma temperature profile estimation.

The diagnostic principle requires it to be absolutely calibrated so that the intensity of the emission is derivable from the measurement at every frequency in the specified spectral range of 70–1000 GHz.

This work finds an approximation...