# Homework Help: Particle Accelerators: How do I calculate the amount of particles per bunch?

1. Nov 5, 2009

### martinhiggs

1. The problem statement, all variables and given/known data

The circumference of the collider is 26.66 km, and there are 4 equally spaced points where the beams collide.

A collision takes place every 22microseconds at each one of the collision points, with 4 bunches in each beam.

The average current per beam is 3mA.

I have to work out how many particles per bunch this corresponds to?

I've looked everywhere for a relevant equation and can't find anything! Any ideas please?

2. Nov 5, 2009

### lanedance

do you know what the charge of the particles is? you're given a current...

3. Nov 5, 2009

### martinhiggs

Yes, sorry, they are electrons and positrons colliding.

4. Nov 5, 2009

### lanedance

ok, so if you know the charge of a particle & the overall current, you should be able to calculate the rate of particles passing a point... (from the definition of current)