Development of a thin-target hard X-ray bremsstrahlung detection system to study confined runaway electrons in Aditya-U Tokamak
Abstract
A specially shielded CdTe detector based hard X-ray (HXR) monitoring system equipped with a lead collimator has been developed and installed on the Aditya-U tokamak to investigate the dynamics of fast electrons (~20-200 keV) generated during sawtooth activity. The pre-existing HXR monitor in Aditya-U is exposed to the entire HXR bremsstrahlung emission from the plasma volume, peripheral limiters, and other structural components, which limits its ability to separately study the dynamics of lost and confined runaway electrons (REs). In contrast, the newly developed diagnostic has successfully measured the chord-averaged thin-target HXR bremsstrahlung emission encompassing the core plasma region, particularly within and around the sawtooth inversion radius. The measured HXR spectra are validated through forward modelling code that incorporates plasma parameters, confined RE characteristics, and the geometric configuration of the diagnostic system. The results confirm the capability of the developed HXR monitor to probe the fast-electron dynamics during internal plasma instabilities.
Cite
@article{arxiv.2607.01488,
title = {Development of a thin-target hard X-ray bremsstrahlung detection system to study confined runaway electrons in Aditya-U Tokamak},
author = {Suman Dolui and Santosh Pandya and J. Kumar and Bharat Hegde and Kaushlender Singh and J. Ghosh and Komal Yadav and Mitul Abhangi and Shishir Purohit and Minsha Shah and Laxmikanta Pradhan and Harshita Raj and R. L. Tanna and Ashok K. Kumawat and Injamul Hoque and Soumitra Banerjee and Ruchi Varshney and S. Aich and Rohit Kumar and K. A. Jadeja and K. M. Patel and M. K. Gupta and P. K. Chattopadhyay and A. Sen and Y. C. Saxena and R. Pal},
journal= {arXiv preprint arXiv:2607.01488},
year = {2026}
}
Comments
13 pages, 6 figures