## Trapping Particals in magnetic feild.

For the discussion of the sciences. Physics problems, chemistry equations, biology weirdness, it all goes here.

Moderators: gmalivuk, Moderators General, Prelates

Goblin080
Posts: 7
Joined: Mon Jan 18, 2010 5:55 am UTC

### Trapping Particals in magnetic feild.

Hi all.

Would it be possible to fire a particle at an angle from a round object and trap it in orbit using magnetic fields?

Posts: 1392
Joined: Sat Mar 07, 2009 11:33 am UTC
Location: ᘝᓄᘈᖉᐣ
Contact:

### Re: Trapping Particals in magnetic feild.

If the particle is charged, then yes; see cyclotron resonance.

Section 5.1.2 of Introduction to Electrodynamics by David J. Griffiths (4th ed., pages 212-215) gives an easy-to-follow derivation, although it's a bit long to quote here.
Last edited by Link on Fri Aug 16, 2013 10:04 pm UTC, edited 1 time in total.

flownt
Posts: 70
Joined: Sat Feb 09, 2013 5:24 pm UTC

### Re: Trapping Particals in magnetic feild.

Given arbitrary instruments to create the magnetic field: yes*. only using the sphere: I doubt it. However, binding it electrostatically might be easier, just put the opposite charge in the sphere.

By the way, if your particle isn't charged, like a neutron, then the answer is no.

*: constant magnettic field perpendicular to the circle you want the particle to move about. IIRC this requires current spinning through a cylinder around your particle.

idobox
Posts: 1591
Joined: Wed Apr 02, 2008 8:54 pm UTC
Location: Marseille, France

### Re: Trapping Particals in magnetic feild.

A charged particle in a void, travelling perpendicularly to a constant magnetic field will 'orbit' for some time, but it will loose energy (and speed) through synchrotron radiation. Particle accelerators commonly do that.
It might be possible to get this effect with non-uniform fields, but it's probably more difficult.

Another, more complex design involves toroidal electromagnets and is used to confine plasmas (look for tokamak).
If there is no answer, there is no question. If there is no solution, there is no problem.

Waffles to space = 100% pure WIN.