Measurements

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By H. Boffin, et al., [faint scan]

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K. E. , 2002. [5] A. Rose, “Sputtered boron films on silicon surface barrier detectors,” Nuclear Instruments and Methods, 52, pp. 166-170, 1967. [6] A. Mireshghi, G. S. S. Hong, T. Jing, H. N. Kaplan and V. Perez-Mendez, “High efficiency neutron sensitive amorphous silicon pixel detectors,” IEEE Transactions on Nuclear Science, 41, pp. 915-921, 1994. S. T. C. W. Olsen, “Semi-insulating bulk GaAs thermal neutron imaging arrays,” IEEE Transactions on Nuclear Science, 43, pp. 13571364, 1996. [8] C.

Instead of using epoxy plugs to seal in the fill gas, the gas was trapped inside when the substrates were sealed together inside of an argon filled glove box. The wires were connected to the substrate contacts using solder paste. These processing exceptions allowed the detectors to be constructed in a significantly shorter amount of time and they have been experimentally proven to work in previous prototype tests. Using the cabling setup described in sections 0 and 0, the detectors were wired to an Ortec 142IH preamplifier via 40 feet of cable.

Internal area with new shelving shown. Figure 4: Nytech oven with new controller and inert gas injection line. The initial platinum contacts were deposited at only 1000 Å instead of the desired 10000 Å. The resistance of these coatings started at 20 Ω and after the heat treatment the resistance rose to 300 Ω. This rise in resistance is due to the platinum settling into the rough surface of the alumina substrate. The platinum was thin enough to cause separations between sections of the coating. In order to correct this problem, the coatings were evaporated again with 100 Å of titanium and 12000 Å of platinum, which was the maximum that could be deposited at one time due to measurement limitations.

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Astrotomography by H. Boffin, et al., [faint scan]


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