BowlOfRed
Master Poster
Today I was listening (CD version) to an article on cold fusion in the New Scientist of 5th November. I hasten to add that I didn't atually understand any of it, but find it so ineteresting to try. There was something about the LHC there too and about magnets and the experiments being done there. A question occurs: if particles are being sent off to travel, why is it better to make them travel in a circle and is it the magnets that make them follow that circle? I appreciate that it would of course be somewhat difficult to build a 27-mile straight tube!! In theory, would a straight tube work better?
Yes, the magnetic field directs the particles in a circle.
Yes, the accelerator is trying to speed up (or pump energy into) the particles. It can't do this instantaneously, so it has to do this over a distance.
It's not that you can't build a 27-mile straight tube, it's that you can't turn around at the end. A circular accelerator is effectively infinitely long, so the acceleration can be done over a longer path. It can also set up collisions to happen on multiple passes (since not all the accelerated particles will hit the target on the first pass).