I read that the MCP-in is supposed to be operated at ground voltage. Is it possible to apply it a slightly positive voltage, lets say +50 Volts, to induce electrons to hit the MCP?
In general, MCP assemblies can be operated with any electrode (MCP-in, MCP-out or anode) at a ground potential. When detecting electrons it’s also possible to apply positive voltage to MCP-In electrode, keeping voltages between MCP-In MCP-Out and MCP-Out and Anode as recommended: Between MCP-in and MCP-out: Set this voltage according to the required gain, 700 -1000V per MCP typical, 1100 V maximum, MCP out at positive polarity. Between MCP-out and single anode: This is normally set at about 100 – 200 V. On the other hand, one should take into account the following: Positive potential on the MCP-In electrode can result in higher noise signal from residual electrons in the vacuum chamber. Background electrons can be generated by ion pumps, external laser and UV sources, electrical discharge near high voltage electrodes etc. Adding small positive voltage (around +50V) may be not enough for efficient detection of electrons. It was experimentally shown that for better detection efficiency i
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