Charged particle focusing device

Thread starter motorman
Start date Feb 9, 2013
Tags

Charged Charged particle Device Particle

AI Thread Summary

A device that can attract and focus alpha or beta particles exists, functioning similarly to a magnetic lens. These particles can be directed towards a small volume using appropriate positive or negative charges. However, achieving precise focusing to a single point is challenging. The discussion references the concept of a magnetic lens as a potential solution. The inquiry highlights interest in the practical applications of such technology.

Feb 9, 2013

motorman

Hi,

Is there a device that can attract alpha or beta particles and focus them on a point.

Something like the reverse of a CRT tube for electrons.

BR,
Adam

Physics news on Phys.org

Feb 9, 2013

mfb

Mentor

Insights Author

They can be attracted by negative or positive charges, respectively. Not to a single point, but to a small volume, if the conditions are right.
Why do you want to do that?

Feb 10, 2013

DrZoidberg

http://en.wikipedia.org/wiki/Magnetic_lens

Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...

View full post »

Thread 'Why measure the speed of light in one direction?'

It may be shown from the equations of electromagnetism, by James Clerk Maxwell in the 1860’s, that the speed of light in the vacuum of free space is related to electric permittivity (ϵ) and magnetic permeability (μ) by the equation: c=1/√( μ ϵ ) . This value is a constant for the vacuum of free space and is independent of the motion of the observer. It was this fact, in part, that led Albert Einstein to Special Relativity.

View full post »