Products > Cathodes / LaB6, CeBix > Top Hats
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 excels at developing specialized cathodes for custom applications and research purposes. For example, in applications requiring high total current in a large beam spot, a (310) oriented crystal (for maximum emission) in a "top hat" configuration may be ideal. 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 and APTech's experienced staff can work with you from the design stage of your final project to the final manufacture.
Applied Physics Technologies offers top hats with diameters of 1.0 mm, 1.6 mm, 2.0 mm and 2.8 mm. Top hats can be mounted on Cambridge, Omicron or Philips bases. Contact APTech for your design cathode and manufacture needs.
 
Material |
(100) Work Function |
(310) Work Function |
Evaporation Rate at 1800 K |
Current Density (310) face at 1800 K |
Maximum Current from 3-mm diameter top-hat at 1800 K |
LaB6 |
2.65 eV |
2.6eV |
16.8 nm/hr |
20.1 A/cm ² |
1.4 A |
CeBix |
2.5 eV |
2.4eV |
12.0 nm/hr |
73.1 A/cm ² |
5.1 A |
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