Abstract
The performance of a recently developed, movable, homemade microchannel plate detector (MCPD) assembly is comparable to that of a commercial design mounted onto a special flange. A 50-Omega cable with good vacuum characteristics coupled to a 50-Omega vacuum feedthrough allows flexibility in research studies while preserving signal pulse integrity in the special ion optical configurations where the MCPD cannot be positioned close to a vacuum port. This flexibility becomes important as more studies in TOF-MS are performed. For example, placing the detector at various locations along the ion path is especially useful when an ion reflector (13) is being installed and tested. Some experimental apparatus may require impedances other than 50 Omega, but similar techniques can be applied.
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