The increasing availability of small satellites such as CubeSats have improved low cost access to space. New scientific measurements may be made, and new concepts may be tested for larger scale missions in the future. Particle detection instruments in conventional size spacecraft have to meet significant constraints on mass, power and volume. These constraints are more substantial in the CubeSat platform. Microchannel plate (MCP) electron multipliers are frequently used in particle detection instruments because of their high gain, low mass, and thin planar configuration. However, non-planar MCPs can be used to improve instrument performance and make better use of available volume by adopting a shape that is compatible with the natural instrument geometry. Non-planar MCPs have been made in this work using a novel method, in which a glass microchannel substrate is coated with thin films that provide the necessary resistive and secondary electron emissive properties. The glass substrates were first slumped at a high temperature to a mandrel of the desired shape, after which the thin films were applied. The MCPs were cylindrically curved, with radii of curvature of 75 mm and 20 mm, and with angular spans of 90 degrees and 180 degrees respectively. The azimuthal gain and resistance uniformity was measured and will be presented.
Bundles of hollow glass capillaries can be tapered to produce quasi-focusing x-ray optics. These optics are known
as Kumakhov lenses. These optics are interesting for lab-based sources because they can be used to collimate
and concentrate x-rays originating from a point, such as a laser focus or an electron-beam focus in a microtube.
We report pilot production and advanced development performance results achieved for Large Area Picosecond
Photodetectors (LAPPD). The LAPPD is a microchannel plate (MCP) based photodetector, capable of imaging with
single-photon sensitivity at high spatial and temporal resolutions in a hermetic package with an active area of 400 square
centimeters. In December 2015, Incom Inc. completed installation of equipment and facilities for demonstration of
early stage pilot production of LAPPD. Initial fabrication trials commenced in January 2016. The “baseline” LAPPD
employs an all-glass hermetic package with top and bottom plates and sidewalls made of borosilicate float glass. Signals
are generated by a bi-alkali Na2KSb photocathode and amplified with a stacked chevron pair of “next generation” MCPs
produced by applying resistive and emissive atomic layer deposition coatings to borosilicate glass capillary array (GCA)
substrates. Signals are collected on RF strip-line anodes applied to the bottom plates which exit the detector via pinfree
hermetic seals under the side walls. Prior tests show that LAPPDs have electron gains greater than 107, submillimeter
space resolution for large pulses and several mm for single photons, time resolutions of 50 picoseconds for
single photons, predicted resolution of less than 5 picoseconds for large pulses, high stability versus charge extraction,
and good uniformity. LAPPD performance results for product produced during the first half of 2016 will be reviewed.
Recent advances in the development of LAPPD will also be reviewed, as the baseline design is adapted to meet the
requirements for a wide range of emerging application. These include a novel ceramic package design, ALD coated
MCPs optimized to have a low temperature coefficient of resistance (TCR) and further advances to adapt the LAPPD
for cryogenic applications using Liquid Argon (LAr). These developments will meet the needs for DOE-supported RD
for the Deep Underground Neutrino Experiment (DUNE), nuclear physics applications such as EIC, medical, homeland
security and astronomical applications for direct and indirect photon detection.