3月12日 GEM detectors for Soft X-Ray diagnostics on tokamaks

报告题目：GEM detectors for Soft X-Ray diagnostics on tokamaks

报告人：Federico Caruggi

主持人：Guoqiang Zhong

时间：周四(3月12日)下午2:00，

地点：四号楼6楼中间会议室

报告摘要：

Soft X-ray diagnostics (SXR) are a fundamental tool for the study of plasma performance in the context of magnetic confinement machines (tokamaks). The analysis of heavy impurity transport and accumulation relies on the ability to reconstruct the emissivity profiles of their characteristic X-ray lines and to monitor their temporal evolution. In addition, soft X-rays diagnostics can provide a complementary measurement for monitoring the plasma shape and its displacement. Innovative detectors capable of measurements concurrently resolved in time, space and energy can thus represent unique sources of information not available with more conventional detection techniques.

Detectors based on Gas Electron Multiplier (GEM) technology can provide a viable solution, offering a relatively inexpensive and versatile instrument for the measurement of soft X-rays. With appropriate design and suitable readout electronics, they can be operated in single photon counting mode, combining excellent temporal resolution, good spatial resolution and spectroscopic capabilities, all within a single detector.

This seminar presents the recent experiences of the Milan team on the development and application of GEM detectors for soft X-ray measurements. The design of the prototypes and their readout electronics (based on GEMINI ASICs) are described, and the results from two cases of study are presented: the performances at the High Voltage Padova Test Facility (HVPTF) in Italy, for the study of vacuum discharges, and their use as SXR diagnostics at the Mega Amp Spherical Tokamak Upgrade (MAST-U) in the UK. Finally, prospects for integrating this diagnostic at the Experimental Advanced Superconducting Tokamak (EAST) are outlined.

报告人简介：

Federico Caruggi obtained his M.Sc. in Nuclear Engineering from the Politecnico di Milano in 2021, with a thesis on simulations for Generation IV fission reactors. He then worked as a research fellow at the University of Milan-Bicocca, contributing to the development of gamma-ray and neutron diagnostic systems for the DEMO tokamak.

He later completed his Ph.D. at the same university, working on vacuum discharges and X-ray diagnostics at the High Voltage Padova Test Facility within the framework of the ITER Neutral Beam Injector project. He is currently working at the Institute of Plasma Science and Technology of the Italian National Research Council, where his research focuses on neutron diagnostics for tokamaks.