The discussion centers on the energy dynamics of an electron beam in a circular path under the influence of an electric field, specifically addressing whether photon emission leads to energy loss. It is established that while electrons do radiate photons when accelerating, stable circular electron beams, such as those in particle accelerators, require continuous energy input to maintain their trajectory. The 2.45 GHz frequency produced by electron beams in devices like microwave ovens does not result in visible light or significant photon emission. The conversation also touches on concepts like synchrotron radiation and Bremsstrahlung, emphasizing that energy loss is minimal in low-energy setups.
PREREQUISITESPhysicists, electrical engineers, and students in electromagnetism or particle physics who are interested in the behavior of electron beams and their energy dynamics in circular paths.
houlahound said:A non varying DC current in a wire would not emit EM but if the level changed then I expect it would.
A constant level DC current in a loop would not I expect emit EM but then I get tripped up because a circle motion implies acceleration and accelerating electrons radiate??
The device mentioned supplies a power to both the B field and the electrons, this power must compensate for radiative losses or the electrons would spiral out of a fixed radius...I'm so confused.
I have the idea that a charged particle can be manipulated by electrostatic focusing and electromagnet lenses.houlahound said:A non varying DC current in a wire would not emit EM but if the level changed then I expect it would.
A constant level DC current in a loop would not I expect emit EM but then I get tripped up because a circle motion implies acceleration and accelerating electrons radiate??
The device mentioned supplies a power to both the B field and the electrons, this power must compensate for radiative losses or the electrons would spiral out of a fixed radius...I'm so confused.
I like the straight sections containing periodic magnetic structures to produce different effects.ZapperZ said:Did you read all the responses you were given? I could have sworn someone asked you to look up "synchrotron radiation". If you haven't, read this:
http://www.eecs.berkeley.edu/~attwood/srms/2007/Lec08.pdf
Pay attention to page 3, and see what happen for v<<c, and compare that to v~c.
Zz.