Abstract
A triple-axis goniometer was designed and constructed for positioning objects within an ultrahigh vacuum chamber. The goniometer is applied to move a large position-sensitive microchannel plate (MCP) detector which is used for scattering and recoiling imaging spectrometry (SARIS). The goniometer allows the MCP to be independently rotated in horizontal (φ) and vertical (θ) planes as well as translated with respect to a fixed sample position. The angle φ can be varied from 0° to 160° in order to change the scattering angle for SARIS. The angle θ can be varied from 0° to 80°, allowing the MCP to be moved out of the scattering plane. Translation allows the MCP to be moved relative to the sample position over a range of 10–60 cm. All of the movements are driven by computer-controlled stepping motors.
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