Yttria Coated Iridium Disc Cathodes

Yttria Coated Iridium Disc Cathodes


See specifications below.

Part #: - Categories: ,
Model #: yttria-coated-iridium-discs


Kimball Physics offers a Yttria Coated Iridium Disc Cathode. In addition to being a ruggedized thermionic emitter that resists oxidation, these cathodes provide stable and uniform electron emission for a wide variety of electron source applications, especially where vacuum conditions are not ideal. The cathode structure of the ES-535, ES-526, and ES-529 consists of a yttrium oxide coated iridium disc that is heated by conduction from an iridium hairpin and mounted on an AEI or a Kimball Physics base. The ES-535W consists of a yttrium oxide coated iridium disc with tungsten hairpin in place of the iridium hairpin. Other bases are available on a custom basis.

  • Chemically resistant
  • Operating pressure < 10-4 torr for lr (Iridium) heater
  • Operating pressure < 10-5 torr for W (Tungsten) heater
  • Low work function
  • Current densities up to 0.5 A/cm2
  • Disc emission up to 10 mA
  • 3 disc sizes (0.033″, 0.048″, 0.062″ diameters)
  • On AEI (all Yttria Disc Cathodes) or compact CB-104 (ES-535W ) or CB-105 (ES-526, ES-529) bases


Yttrium Coated iridium Disc Cathode Comparison Table


Additional information

Weight 0.55 lbs
Cathode base

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Cathode model number

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