Estimation of reflected electron beam power falling on a target

[vinay289]

Hi,
I need to calculate an estimate of the reflected electron beam power in the form of back scattered electrons and secondary electron emissions from a tungsten/Graphite target. The Electron source is a 25kV source with operated at a power of around 25kW. The tungsten. graphite blocks are 50mm x 30mm and is 15mm thick. the heat produced from the surface is extracted by a water cooling system which runs through the tungsten block, below the 15mm thick layer of tungsten.

How do i approach such a problem? how do you calculate the total energy absorbed in the target, the amount reflected?

 

[elinap]

Hi,
Look at www.mc-set.com, where you can download a program to calculate BS electrons from an electron beam, such as the one in a scanning electron microscope.
From that, you can extend to your particular case.



Eli

 

[Bob S]

At 1 amp on the target, the backscattered electrons may cause a significant space charge problem. This would lead to defocusing of the incident beam.

Bob S