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

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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