Top Hat Cathode Information

Applied Physics Technologies offers custom cathodes that can be fabricated with flat emission surface diameters ranging from a few micrometers to several millimeters, according to your needs. APTech refers to these large flat emission surface cathodes as top hats. A top hat configuration may be ideal for applications requiring high total current in a large beam spot and (310) oriented crystal for maximum emission. Top hat structures can be built for maximum emitting area with modest heating power. These cathodes may be from LaB6 or CeBix®, with (100) or (310) emitting surface orientations, to provide optimum performance for your application.


Top hats have large area emitting surfaces and are mounted in a stable Mini Vogel Mount (MVM). APTech is dedicated to meeting your custom cathode

requirements. We have the facilities to model and experimentally optimize cathode designs. APTech's experienced staff can work with you from the design stage of your project to the final manufacture.


Recently, APTech redesigned their top hat configuration. Changes were made to both the top hat crystal dimensions and the method in which the crystals are mounted. The shunted top hat configuration provides added stability and longer lifetimes for our top hat cathodes. APTech provides a shunted top hat of many different materials varying in sizes from 1 mm to 2.8 mm. These cathodes can be mounted on a variety of bases to fit your system configuration. View our Cathode Guide to see the different customizations available for a top hat cathode.



Transition Metal


Refractory Metals


Top Hat

Guard Ring

Etched Tip

Cathode Guide

Application Guide

Rebuilding Services

Refractory Metals

Source Types

Cathode Dimensions


Services & Parts


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1600 NE Miller St. McMinnville, OR 97128


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