Calendario Dottorato

Ph.D in Physics

Journal Club Seminari 2023

10/10/2023  
AULA C - piano terra - Via della Vasca Navale n. 84

ore: 15:30	Daniele Tagliacozzo DOTTORATO IN FISICA	The geometry of the hot corona in Radio Quiet AGN constrained by X-ray polarimetry
		The X-Ray spectra of Radio Quiet Active Galactic Nuclei (RQ AGN) are dominated by radiation emitted via accretion onto a supermassive black hole and energized via comptonization in a hot and compact medium of unknown geometry and enigmatic physical origin: the corona. Now, the NASA-ASI mission IXPE is giving us the chance to unveil the X-Ray polarization properties of these objects, aligning a new tool to spectroscopical analyses. In this talk I will present the IXPE view of RQ AGN. Indeed, IXPE observed three of these sources in its first two years of activity (NGC 4151, MCG-05-23-16 and IC4329A). I will discuss the spectropolarimetric analysis of MCG-05-23-16, which I dealt with personally, in detail and summarize the analyses of the other two sources, trying to point out the hints we got on the morphology of the comptonizing medium obtained through a comparison with simulations performed with the Monte Carlo code MONK. Then, I will briefly summarize the future steps in order to shed finally light on the enigmatic origin of the AGN corona.

ore: 16:00	Dario Vincenzi DOTTORATO IN FISICA	Automatic Generation of Redundant Configuration in FPGAs
		Field programmable gate arrays (FPGAs) play a key role in nuclear and particle physics experiments for real-time data transfer and processing. The usage of such devices in the radiation environments of detectors at colliders or at fixed-target experiments requires to cope with radiation effects. Radiation- induced single event upsets in the device configuration are the dominant issue for static random-access memory based (SRAM-based) FPGAs. Solutions based on configuration redundancy have been proposed for hardening the configuration memory of commercial off-the-shelf SRAM-based FPGAs. In these solutions, the configuration is majority voted by the firmware to correct configuration errors.  In this tal, I will introduce an automatic methodology to generate a redundant configuration for SRAM- based FPGAs. The methodology is based on copying the configuration fragments to be protected to unused ones, measuring the impact of the copy on the power consumption of the FPGA and on the functionality of the firmware. This method can be considered as an additional step in the design flow for FPGAs, and it runs after the bitstream generation.  Different from others in the literature, this method is completely agnostic with respect to the device, the only requirement being the possibility to write and read back the configuration, which is supported by most of the modern FPGAs.