Plasma weapon
From The Stargate Omnipedia
Experimental prototype weapon designed by Dr. Jay Felger and his lab assistant, Chloe. Chloe believes the energy-based weapon is more similar, in principle, to Star Trek's photon torpedo than phasers. The plasma weapon is intended to replace missiles on the X-303, but Felger's first attempt to present the weapon to his superiors resulted in a massive power failure.
The failure of the plasma weapon led to Dr. Felger's rapid development of the Avenger computer virus as a way of keeping his job.
KEY EPISODE
Avenger 2.0 - Felger nearly loses his position at the S.G.C. after his plasma weapon prototype shorts out base power.