(a) Schematic showing the boron-10 dot array test sample and a model of the CB-KID superconducting neutron microscope. The CB-KID is a stack of different layers of materials. The incident neutron beam undergoes nuclear reactions in the boron-10 conversion layer, which releases ⁴He and ⁷Li particles that are then detected by the superconducting wires. (b) Simulated neutron tracks, where the colors indicate the neutron fluence, or the number of neutrons per unit area. The horizontal red line in the figure shows the focused neutron beam which was simulated incident to the center of the detector. (c) Simulation results of a neutron transmission image from the CB-KID of the boron-10 dot array test sample (left side of panel (a)), where a uniform neutron beam was simulated incident on the CB-KID. Only a small number of neutrons could pass through the boron-10 dots; these show up as dark regions in the image.