[Total Beginner]Trivium-style Screams?

What kind of screams does Matt from Trivium use? Any good guides on how to imitate the sound? All I want to be able to do is sing along with the music I listen to(pretty lame, I know) so I'm not looking to spend money on a vocal coach, but I have no idea where to even start with unclean vocals. Thanks.

Edit: I like the screams the best from In Waves so if he changes technique over the albums, In Waves is my target.