Hello all! Firstly, thanks for reading this post! I am a high school student attempting to make a basic, dry ice cloud chamber. I have made several cloud chamber designs and I am about to start making it. However, before constructing the product I would appreciate some members to provide answers to the silly questions I have. One, it has recently come to my attention that an electrostatic field is required on top of the chamber to make tracks easier to visualise. However, after looking at several tutorials on cloud chambers I realised that not many put electrostatic fields on top of the chambers. Therefore, I am wondering how I could possibly adapt an electrostatic field to my designs? Screenshots of my design (made on sketchup): As visible in the images above, the cover for my cloud chamber is almost like a lid with some sort of a hinge, allowing it to open and close with being removed from the body of the chamber. There is a small hole in the side of the chamber for rubber stoppers that carry radioactive isotopes into the chamber (this is used in testing). The lid is preferably made of acrylic, with a simple rectangular (empty in the middle) strip of black felt stuck to the lids base. So there is still a visible area in the hole created by that black felt. Furthermore, the yellow lines next to the small hole are LED strips. Question: How can I supply an electrostatic field to the top of my chamber (in this specific design) - feel free to criticise the design itself before answering my main question, I am open to suggestions.