Estimation of reflected electron beam power falling on a target

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SUMMARY

The discussion focuses on estimating the reflected electron beam power from a tungsten/graphite target when subjected to a 25kV electron source operating at 25kW. The target dimensions are specified as 50mm x 30mm x 15mm, with a water cooling system implemented to manage heat. Participants recommend using the MCSET software from www.mc-set.com to calculate backscattered electrons and secondary electron emissions, which can be adapted for specific scenarios. Additionally, concerns about space charge effects at 1 amp on the target are highlighted, indicating potential beam defocusing issues.

PREREQUISITES
  • Understanding of electron beam physics
  • Familiarity with tungsten and graphite material properties
  • Knowledge of secondary electron emission mechanisms
  • Experience with thermal management systems in electron beam applications
NEXT STEPS
  • Research the MCSET software for calculating backscattered electrons
  • Study the principles of secondary electron emissions from solid materials
  • Explore methods for mitigating space charge effects in electron beams
  • Investigate thermal management techniques for electron beam targets
USEFUL FOR

This discussion is beneficial for physicists, materials scientists, and engineers involved in electron beam applications, particularly those working with tungsten and graphite targets in high-energy environments.

vinay289
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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?
 
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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
 
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
 

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