Title:

Curved Microchannel Plates for Time of Flight Mass Spectrometer

The COmposition and DIstribution Function analyzer (CODIF) is a typical Time-of-Flight (TOF) mass spectrometer that uses thin carbon foils and flat micro-channel plates (MCP) in chevron stacks. To measure TOF of incoming ions a start signal is initiated by secondary electrons from the carbon foil and stop signal is generated by the MCP chevron assembly a known distance away. The purpose of the project was to modify and design an inner bracket system for the existing CODIF instrument to use newly developed curved MCPs. The MCPs are curved to simplify electron steering and accommodate the cylindrical shape of the CODIF. The goal of the bracket system was to secure a curved MCP stack in a modified holder at a desired distance from a toroidal shaped MCP stack. The bracket system created uses vertical rails with standoffs to separate thin plates that hold the start and stop chevron holders. This design allows for improved performance and efficiency of the CODIF instrument and the ability to change flight path length for various testing.

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