I am hoping to make a particle accelerator for a science fair, but am not sure on how to go about doing it. Can someone please give me some advice on what materials i will need to make an accelerator while at the same time being at a reasonable cost. Any websites will also help a lot. P.S. I do not want anything too fancy, just something that can convey the msg of how it works, while at the same time, being presentable. Any help is greatly appreciated!!!