Technical data

Overview 1
Front-end ion optics
Agilent 6200 Series TOF and 6500 Series Q-TOF LC/MS System Concepts Guide 43
ever-increasing cascade of electrons travels to the rear of the
plate. Roughly 10 times more electrons exit the MCP than
incoming ions contact the surface.
These electrons are then focused onto a scintillator, which,
when struck by electrons, produces a flash of light. The light
from the scintillator is focused through two small lenses onto
a photomultiplier tube (PMT), which produces the electrical
signal read by the data system. The reason for producing an
optical signal from the MCP electrons is because the output of
the MCP is at roughly -6000 volts. The light produced by the
scintillator passes to the PMT, which has a signal output at
ground potential.