Initial results from time-resolved LaBr based hard x-ray spectrometer for ADITYA-U tokamak

S Purohit; M K Gupta; M B Chowdhuri; I Mansuri; M Bhandarkar; B K Shukla; K Shah; R Manchanda; U C Nagora; S K Pathak; K A Jadeja; R L Tanna; J Ghosh; ADITYA-U Team

doi:10.1063/5.0101310

Initial results from time-resolved LaBr based hard x-ray spectrometer for ADITYA-U tokamak

Rev Sci Instrum. 2022 Sep 1;93(9):093512. doi: 10.1063/5.0101310.

Authors

S Purohit¹, M K Gupta¹, M B Chowdhuri¹, I Mansuri¹, M Bhandarkar¹, B K Shukla¹, K Shah², R Manchanda¹, U C Nagora¹, S K Pathak¹, K A Jadeja¹, R L Tanna¹, J Ghosh³; ADITYA-U Team³

Affiliations

¹ Institute for Plasma Research, Bhat, Gandhinagar 382 428, Gujarat, India.
² Department of Physics, Pandit Deendayal Energy University (PDEU), Raisan, Gandhinagar 382 007, Gujarat, India.
³ Institute for Plasma Research, Bhat, Gandhinagar 382 428, Gujarat, IndiaDepartment of Physics, Pandit Deendayal Energy University (PDEU), Raisan, Gandhinagar 382 007, Gujarat, IndiaHomi Bhaba National Institute, Training School Complex, Anushakti Nagar, Mumbai 400 094, India.

PMID: 36182481
DOI: 10.1063/5.0101310

Abstract

Runaway electrons (REs) are passively studied by hard x-ray (HX) emissions generated by REs. A LaBr₃(Ce) detector-based HX spectroscopic diagnostic (operational within ∼75 keV to 3.5 MeV) has been set up on the ADITYA-U. The diagnostic acquisition software utility is upgraded to obtain the temporal evolution of the HX spectrum to understand the RE energy distribution in plasma during its various phases. The peak position moves to lower energy for Ohmically heated discharges (200-80 keV), indicating a relative increase in the thermal particle content in the plasma. The peak position of RE energy shows a decreasing tendency with increasing n_e with Ne gas puffing and termination of the electron cyclotron resonance pulse.