Schottky TFE emitter module YPS-174-H for Hitachi TFE columns

Description

The YPS Schottky type thermal field emission sources are an excellent choice to replace used TFE sources in electron beam systems, including FESEM, SFEG-SEM, FETEM, EPMA, Auger and CD-SEM systems. The YPS sources are drop-in replacements for existing FEI and Denka style sources also known as 184 and 174 type suppressors. The YPS Schottky TFE source consists of a single crystal (100) tungsten wire with a very sharp tip including a zirconium reservoir around the tungsten tip wire. The tip is mounted on a hairpin filament which is used to maintain the tip ate a temperature of around 1800K. This assembly is mounted in a cylindrical suppressor electrode with an aperture through which the sharp tip protrudes. Electrons are emitted from the tip due to both thermal excitation and the electrical field at the tip. The YPS Schottky TFE source tip typically has a radius of 0.3µm and protrudes around 250µm to ensure high brightness of the source.

YPS Schottky TFE sources
YPS supplies standard designs, refurbishes legacy designs and designs and supplies custom TFE sources. These products are aimed to customers who are comfortable with changing field emission sources and know how to change, load and align the TFE sources in a clean environment. Operating vacuum for Schottky TFE sources is typically better than 1×10-9mbar. This is higher than the operating vacuum for tungsten or Lab6 sources, but less stringent than for cold field emission sources. The YPS Schottky thermal field emission sources exhibit excellent stability over a wide range of acceleration voltages and long operating times. Electron Source Performance Table

YPS-174 Standard Schottky TFE emitter module
The YPS-174 Schottky TFE module is a drop-in replacement for the most common standard Schottky thermal field emitter module. It is equivalent in dimensions with both Denka and FEI standard Schottky field emission cathodes. The suppressor aperture has a diameter of 400µm. The emitter typically protrudes 250µm from the suppressor electrode. The YPS-174 is compatible with thermal field emission sources used on E-beam systems from AmRay, Hitachi, JEOL, Zeiss, LEO, Philips, PHI and Riber.