Abstract
The present generation of Micro-Pattern Gaseous Detectors (MPGDs) are radiation hard detectors, capable of detecting effciently particle rates of several MHz/cm2, while exhibiting good spatial resolution (≤ 50 µm) and modest time resolution of 5-10 ns, which satisfies the current generation of experiments (High Luminosity LHC upgrades of CMS and ATLAS) but it is not sufficient for bunch crossing identification of fast timing systems at FCC-hh. Thanks to the application of thin resistive films such as Diamond-Like Carbon (DLC) a new detector concept was conceived: Fast Timing MPGD (FTM). In the FTM the drift volume of the detector has been divided in several layers each with their own amplification structure. The use of resistive electrodes makes the entire structure transparent for electrical signals. After some first initial encouraging results, progress has been slowed down due to problems with the wet-etching of DLC-coated polyimide foils. To solve these problems a more in-depth knowledge of the internal stress of the DLC together with the DLC-polyimide adhesion is required. We will report on the production of DLC films produced in Italy with Ion Beam Sputtering and Pulsed Laser Deposition, where we are searching to improve the adhesion of the thin DLC films, combined with a very high uniformity of the resistivity values.
Highlights
Micro-Pattern Gaseous Detectors (MPGDs) are characterised by micro-metric anode structures that allow for fast collection of ions created during the avalanche process
The present generation of Micro-Pattern Gaseous Detectors (MPGDs) are radiation hard detectors, capable of detecting efficiently particle rates of several MHz/cm2, while exhibiting good spatial resolution (≤ 50 μm) and modest time resolution of 5–10 ns, which satisfies the current generation of experiments (High Luminosity LHC upgrades of CMS and ATLAS) but it is not sufficient for bunch crossing identification of fast timing systems at FCChh
In the Fast Timing MPGD (FTM) the drift volume of the detector has been divided in several layers each with their own amplification structure
Summary
MPGDs are characterised by micro-metric anode structures that allow for fast collection of ions created during the avalanche process. This leads to a design where there is typically a milimetric gap for creation of primary ion-electron pairs and an amplification structure with the dimension. If instead one makes a fully resistive detector, signals of any (intermediate) layer can be picked up by external readout strips This requires fully resistive amplification structures: one possible candidate to replace the metallic GEM electrodes is Diamond-Like Carbon is an amorphous film containing a significant fraction of sp hybridization with attractive mechanical and resistive properties [2, 3]. DLC films can be made with resistivities spanning 102 to 1016 Ωcm
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