Incom Inc. is developing and commercializing microchannel plate (MCP) electron multiplier devices made from leadfree glass capillary array (GCA) substrates that are functionalized using atomic layer deposition (ALD) thin film coating technology. Notable benefits over conventional lead-oxide based MCP technology are larger MCP size, high and stable gain, low dark counts and gamma-ray sensitivity, improved mechanical and thermal stability, and the unique ability to tune the MCP resistance and electron amplification characteristics over a much wider range and independently from the glass substrate. Incom now routinely produces ALD-GCA-MCPs with 10 and 20 m pore size at MCP dimensions up to 20 cm x 20 cm. ALD-GCA-MCPs are used for photon counting and charged particle detection in analytical instruments, high energy physics, nuclear physics, and space science applications. For future astronomical applications such as LUVOIR, HabEx, and CETUS, large-area, high-performance MCP electron amplifiers are paired with high-performance cross-strip readout systems and integrated into large format (≥ 50 mm sq.) photodetectors operating in the UV and optical regimes. Incom’s large area ALD-MCP-GCA technology is critical for realizing such large format photodetectors. In this paper, we provide a brief update on recent developments addressing the quality of the glass substrate as well as the thermal stability of the MCPs.
Incom, Inc. is now producing commercially available Large Area Picosecond Photo-Detectors (LAPPD™) usable in applications by early adopters. The first generation LAPPD™ is an all-glass 230 x 220 x 22 mm3 flat panel photodetector with a chevron stack of glass capillary array microchannel plates functionalized by atomic layer deposition, a semitransparent bi-alkali photocathode, and a strip-line anode. The photodetector is being optimized for applications requiring picosecond timing and millimeter spatial resolution and has achieved single photoelectron (PE) timing resolutions of α≤52 ps. Typical performance metrics include electron gains of 107 at 1 kV per MCP, low dark noise rates (15-30 Hz/cm2 at moderate gains), single PE spatial response along and across strips of 1.8 mm and 0.76 mm respectively and quantum efficiencies that are typically ≥20% at 365 nm. Changes to the “baseline” LAPPD™ are under development to optimize the photodetector for applications requiring very high spatial resolutions.
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