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## Homework Statement

A collider has an average electron current of 10 milliAmps and an average positron current of

5 milliAmps.If the ring radius is 100 m and there is one electron bunch and one positron bunch

with uniform density, radius 1 µ and length 2 mm, what is the average luminosity in cm–2s–1 ?

## Homework Equations

L=N_1 N_2/A * f

density = N/(AT)

## The Attempt at a Solution

Ok so I know the target thickness (T) is 2mm with and Area (A) of pi * (1µ)^2

The density I am having a problem with.

I don't know how to incorporate the current given or the ring radius.

Just having a hard time with this question in general. Not sure where to start or where to plug everything in. Please help - thanks!