What are the advantages of the 60:1 L/D MCPs?
A.- We are increasingly supplying the Photonis Advanced Performance detector assemblies with the 60:1 Length to Pore Diameter(L/D) ratio. These thicker plates have a number of advantages over the 40:1 (L/D) MCPs that have been traditionally used in detector assemblies: • Durability: The higher (L/D), gives a thicker MCP for a given pore size yielding a more mechanically rugged design. • Higher gain: The 60:1 L/D MCPs are capable of x10 higher gain than the 40:1MCPs, with the thicker plates operating up to about 1,400V as opposed to 1,000V. This higher operating voltage capability allows the voltage to be increased as the gain drops over time essentially giving the 60:1 plates a “gain reserve” that allows the desired gain to be maintained for a longer lifetime. • Improved pulse height distribution: The use of 60:1 L/D MCPs in Chevron tm and Z-stack configurations for pulse counting typically reduces the Full Width Half Maximum (fwhm) by 50% while providing a greater than 2x higher modal
