How mask mesh or Particle In Unity VFX Graph?

Hello Guys, I am working on This project I want to make it like a beam emitting From Circle I use so How can I make it like that How can I mask Or Hide that part of the mesh? I am using VFX Graph. Dropbox - movie_076.mp4 - Simplify your life

You can pass uv param to hide part of mesh over time, but here is no need to create such overcomplicated solution, when you can use simple ribon