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Subject: Micro-Pattern Gas Detector Technologies for Physics Projects at the Energy, Intensity and Cosmic Frontiers
Speaker:    Maksym Titov
Centre de Saclay
Date: Monday, April 25, 2016
Time: 11:00 a.m.
Place: CEBAF Center Auditorium
Abstract:Improvements in detector technology often come from capitalizing on industrial progress. Advances are made with new insights; industrial developments in photo-lithography, microelectronics and printed circuits technique have opened the road for the production of micro-structured gas amplification devices. In particular, ease of manufacturing, operational stability and superior performances have given rise to two major designs: the gas electron-multiplier (GEM) and micro-mesh gaseous structure (Micromegas). By using a pitch size of a few hundred micrometers, both devices exhibit intrinsic high-rate capability (> 1MHz/mm2), excellent spatial and double-track resolution (~ 30 ìm and 500 ìm, respectively), and a time resolution for single photo-electrons down to a few-hundred pico-second range. For applications requiring imaging detectors with large-area coverage and moderate spatial resolution (e.g. ring-imaging Cherenkov (RICH) counters), coarser macro-patterned structures (e.g. thick-GEM (THGEM)) offer an interesting economic solution. Coupling the microelectronics industry and advanced PCB technology has been important for the development of gas detectors with increasingly smaller pitch size. An elegant example is the use of a CMOS pixel ASIC, assembled directly below the GEM or Micromegas amplification structure. Using this approach, Micro-Pattern Gas Detectors (MPGD) can reach the level of integration, compactness and resolving power typical of solid-state pixel devices.

Science is complex. The use mega-projects at particle accelerators, like the LHC, is very important to engage people with science and to receive public recognition. During the past five years, there have been major developments of Micromegas and GEMs for various upgrades for ATLAS, CMS and ALICE experiments at the LHC, as well as THGEMs for the upgrade of the COMPASS RICH at CERN. The choice of the MPGD technology fulfills the most stringent constraints imposed by future facilities, from the Nuclotron-based Ion Collider fAcility (NICA) and Facility for Antiproton and Ion Research (FAIR) to the Electron-Ion Collider (EIC), from the electron-positron Linear Colliders (ILC/CLIC) to the circular machine (Cepc), and proton-proton Future Circular Collider (FCC). MPGDs have also found numerous applications in other fields of fundamental and applied research at the Energy, Intensity and Cosmic Frontiers. They are being used or considered for X-ray imaging and neutron scattering science, neutrino-nucleus scattering experiments, dark matter and astrophysics experiments, including operation at cryogenic temperatures, plasma diagnostics at tokamaks, material sciences, radioactive-waste monitoring and security applications, medical physics, portal imaging and hadron therapy.

The interest in the technological development and the use of the novel MPGD technologies has led to the establishment of the RD51 collaboration at CERN in 2008. Originally created for the five-year term, the RD51 was prolonged for another five years beyond 2013. Many of the MPGD technologies we know today were introduced before RD51 was founded. But with more techniques becoming available (or affordable), new detection concepts are still being introduced and existing ones are substantially improved. This talk will highlight recent MPGD technology advances, review RD51 collaboration activities, and address numerous MPGD applications at the Energy, Intensity and Cosmic Frontiers.

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