Book: Fallen Arsenal.
Scorch Cannons are shoulder-mounted heavy impact weapons used by the Fallen for hull-puncturing in ship-to-ship raiding parties.
The Scorch Cannon uses a compressed Solar "furnace" to focus and direct superheated rods of solar energy. Each burst is mapped to the Cannon's firing matrix, allowing the wielder to hold a fired rod's charge. Release of the firing actuator triggers detonation. The longer the actuator is held the greater the rod's explosive impact.