SLAC Electrons: Mass, Velocity & EM Energy

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Discussion Overview

The discussion revolves around the behavior of electrons in the Stanford Linear Accelerator, focusing on their mass, velocity, and electromagnetic (EM) energy during both acceleration and deceleration. It explores concepts related to energy conservation and the implications of mass changes in these processes.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant suggests that during deceleration, electrons might lose mass, raising questions about energy conservation and the possibility of creating "negative or imaginary mass."
  • Another participant explains that electrons are decelerated by electric or magnetic forces, exerting pressure against the magnets, and notes that the energy radiated during this process has mass, implying that energy and mass are conserved.
  • A question is posed about whether electrons retain their original "rest mass" after deceleration.
  • A later reply confirms that electrons would indeed have their original "rest mass" after deceleration.

Areas of Agreement / Disagreement

The discussion contains both agreement and uncertainty. While one participant confirms that electrons retain their rest mass after deceleration, the initial question about mass loss and energy conservation remains unresolved, indicating competing views on the implications of these processes.

Contextual Notes

The discussion does not clarify the assumptions regarding mass-energy equivalence or the definitions of mass in different contexts, leaving these aspects open to interpretation.

HarryWertM
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In the Stanford Linear Accelerator electrons are accelerated thereby gaining mass; velocity; and undoubtedly radiating EM energy. I'm sure they have grounded shielding to avoid loud pops on local AM radio.

But suppose they decelerate electrons the same way - thereby radiating EM energy; losing velocity; and losing mass?? How is energy then conserved?? By creating negative or imaginary mass?? Or do electrons gain even more mass during deceleration, creating "heavy electrons"??
 
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The electrons are decelerated against an electric or magnetic force. They exert pressure and force against the magnets to do this. Also, when they radiate energy, that energy has mass. Energy and mass are conserved.
 
So after deceleration, the electrons would have their original "rest mass"?
 
HarryWertM said:
So after deceleration, the electrons would have their original "rest mass"?

That is exactly correct. :biggrin:
 

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