Particle Accelerater wont get past 95% velocity?

[ryan6803]

I have made a 77*77 particle accelerator, and it is set up correctly with electromagnets stacked 3 high on either side with electromagnetic glass on the top and bottom forming the tube. It is powered by a fusion reactor which is more than strong enough. 

When you turn it on it works fine, the particle spins round the tube. However when it reaches 95% velocity the particle explodes and there is no antimatter made. It also did this with a 40*40 version i did earlier. 

I am on tekkit 1.6.4. (the one with the rocket logo, im not sure about the versions of things etc).

Any help would be great, cheers