Accelerator Design
There are several different ways to design these accelerators, each with its 
benefits and drawbacks. Here's a quick list of the major accelerator design 
choices:
- Accelerators can be arranged to provide collisions of two types:
 - 

Fixed target:  Shoot a particle at a fixed target. 
 
- 
 
Colliding beams: Two beams of particles are made to cross each other. 
 
- Accelerators are shaped in one of two ways:
 - 
 
Linacs:  Linear accelerators, 
in which the particle starts at one end and comes out the other.
- 
 
Synchrotrons:  Accelerators built in a circle, 
in which the particle goes around and around and around...