The micron flat of a cathode.

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Hi everyone.

I have studied Lanthanum Hexaboride (LaB6) cathodes the last few days, but I have a few questions regarding them. There are two types of these cathodes; the flat one and one which is in the shape of a cone. I have attached two documents which handles about these two types of cathodes.

When they are referring to the complete flat of the flat cathode, I know it is the diameter of the cylinder. In this case it is 1.78 mm (LaB6_cathode_ES440). But when they refer to the cone shaped cathodes they refer to the microflat. My question is, is this the point of the cathode to which they are referring? As I understand the microflat is the top of the cone, but in one of the documents I have attached (LaB6_cathode_ES423), they refer to the roundness and smoothness of microflat. Aren't the point then supposed to be flat?

Thanks in advance for the help!

Kind regards,
Lourie
 

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