How do I store MCPs and Channeltrons?
A.- The nature of the materials used in manufacturing microchannel plates and Channeltron detectors are such that certain precautions are required in order to preserve the high performance characteristics of these detectors. The secondary electron emissive surface is composed primarily of an alkali doped silica layer, and as a result, these materials are very hydroscopic. Special care and handling is necessary in order to prevent the absorption of water vapour and ensure optimal detector performance. Typically, Microchannel Plates (MCPs) are placed inside a metal shipping can and the can is then heat sealed in a laminated foil bag. The bag is back-filled with dry nitrogen and then evacuated. This container is suitable for the shipping period only. Upon receipt of the MCP, the device should be removed from its shipping case and the foil bag and stored in a vacuum. If the MCP has been shipped in a metal can, the can should be opened in a clean room environment and the top metal “spider”
