Estimation of reflected electron beam power falling on a target

In summary, the conversation is about calculating the reflected electron beam power from a tungsten/Graphite target using a 25kV source operating at 25kW. The target consists of 50mm x 30mm tungsten blocks with a 15mm thickness and is cooled by a water cooling system. The person is seeking advice on how to approach this problem and is directed to a website for a program that can help with the calculation. The issue of space charge is also mentioned as a potential problem.
  • #1
vinay289
1
0
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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  • #2
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
 
  • #3
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
 

1. What is the purpose of estimating reflected electron beam power on a target?

The estimation of reflected electron beam power on a target is important in understanding the interaction between the electron beam and the target material. This information can be used to optimize the performance of electron beam systems and to prevent damage to the target.

2. How is the reflected electron beam power calculated?

The reflected electron beam power is calculated by measuring the voltage and current of the electron beam and using the formula P = IV, where P is power, I is current, and V is voltage. This calculation assumes that the electron beam is completely absorbed by the target.

3. What factors affect the amount of reflected electron beam power?

The amount of reflected electron beam power is affected by the material and geometry of the target, as well as the energy and intensity of the electron beam. Other factors such as surface roughness, temperature, and contaminants on the target surface can also impact the reflected power.

4. How can reflected electron beam power be minimized?

To minimize the amount of reflected electron beam power, the material and geometry of the target can be optimized to better absorb the electron beam. In addition, controlling the energy and intensity of the electron beam and ensuring a clean and smooth target surface can also help reduce reflection.

5. What are some potential applications of estimating reflected electron beam power?

Estimating reflected electron beam power is important in a variety of fields, including materials science, semiconductor manufacturing, and electron microscopy. It can also be useful in understanding the behavior of electron beam devices, such as electron guns and cathode ray tubes.

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