[SEMINAR]
Speakers: Narcizo M. Souza-Neto, Head of Condensed Matter and Material Science Division, LNLS
Daniel de Oliveira Tavares, Head of Data Acquisition and Processing Division, LNLS
Jean Marie Polli, Leader of Detectors Group, LNLS
Mauricio Martins Donatti, Chief System Architect for ASIC project, LNLS
Titles:
1. Extreme conditions at current and future beamlines at Sirius, the Brazilian Synchrotron light source
2. X-Ray Detectors Development at LNLS/Sirius
Language: English presentation
Time: 13:30 - 16:00 PM, Wednesday, Jan. 15, 2025
Place: Onsite at Conference room 410, Building # 6
Online: https://meeting.tencent.com/dm/PzXmbIM7IxRB
Meeting ID: 736-675-809
Host: Drs. Arthur Haozhe Liu and Lisa Liu
Abstracts:
1. With the advent of fourth-generation synchrotron sources, such as Sirius in Brazil, many opportunities are open to study energy-related materials with conditions yet nonexistent. To tackle this problem, we have in place a complex set of interconnected synchrotron techniques to probe several materials under extreme conditions of high pressure/strain, low/high temperature, and high magnetic field. With x-ray spectroscopy and diffraction techniques we can then access such materials' atomic and magnetic structure under those conditions and help draw a clearer picture of their microscopic phenomena. In this talk, I will show how this is possible with a combination of state-of-the-art new instrumentation at the current extreme condition Beamline (EMA) at Sirius. I will also give a brief introduction the SIRIUS synchrotron and its possibilities as well as the plans for the near future facilities in the area of condensed matter and materials science. This will extend the possibilities already available at the EMA Beamline, creating new opportunities.
2. Pixel detectors with low noise, low deadtime, high speed and small pixel sizes are essential for a wide range of X-ray imaging and diffraction experiments at 4th-generation synchrotron facilities.
In this presentation we provide an overview of the decade-long X-ray detectors development program carried out by the Brazilian Synchrotron Light Laboratory (LNLS) to equip the Sirius light source with state-of-the-art photon counting pixel detectors. Four projects will be presented: (i) PIMEGA, a versatile detectors family based on Medipix3RX chips currently in operation at 6 Sirius beamlines, featuring 55 x 55 µm² pixel size and 2 kHz frame rate. The manufactured units range from 2.36 Megapixels to 9.4 Megapixels, with minimal gaps between modules; (ii) MOBIPIX, a compact air-cooled standalone Medipix3RX-based detector with 246 kilopixels featuring an embedded GPU capable of running fast image reconstructions; (iii) TUPI (Timepix-based Ultra-fast Photon Imaging), a new photon counter detector design based on the Timepix4 chip, currently in R&D phase, featuring large active areas (74 x 94 mm²) with an array of 1344 x 1536 pixels, 55 x 55 µm² pixel size and capable of tens kHz frame rates for imaging acquisition with a 16-bit dynamic range. The detector can discriminate high photon fluxes up to 5 x 10⁹ photons/s/mm² in frame-based mode. These detectors cover an energy range from 5 to 45 keV and can utilize various sensor materials, such as Si, GaAs, and CdTe. The first TUPI prototype is due 2026; (iv) SOPHON (Sub-pixel Optimized Photon-counter) ASIC design targeting 30 μm pixel pitch with GaAs sensors and incorporating a sub-pixel estimation algorithm inside the pixel circuitry, quickly allocating photon hits in 10 μm pitch virtual counters. Currently under microelectronics design, SOPHON proposes to cover scientific applications challenging state-of-the-art spatial resolution for hybrid detectors, respecting high flux capabilities and high detection efficiency for energies up to 50 keV. First prototypes with small active area (3 x 3 mm²) are expected in 2026.
