My 12 year old son recently created a homemade particle accelerator, with help from his grandfather, for his upcoming science fair. Below is his description and youtube video link. Any insight would be helpful. "Hi, I just made this particle accelerator and I was confused on what I was seeing. I was using a copper anode and the test started just as I had seen in other online videos. I had a non-fixed 18 kv power supply and 60 cm of vacuum. There was a constant purple stream touching the anode with about an inch of crooke's effect. After about 45 seconds the stream turned white like it usually does when the bottle gets hot and the contaminant is killed. Then, all of the sudden there was a huge discharge. The stream came down in a tornado-like fashion then went back up and there was just a swirling white tornado touching the side with 3 inches of crooke's effect. There were a few electric lighting- light strikes at the end of the anode before it repeated the process. I have a video below. Please let me know your thoughts."