A shockwave is also left in the wake of the Displacer Cannon’s self-teleport feature, and so safety precautions must still be taken. When a Displacer Cannon is used as a tool to teleport objects or beings, care must be taken that there is no one near that could be harmed by the shockwave, or objects that could sustain damage. When the portal collapses it causes a displacement shockwave, a wave of extremely dangerous space-time distortions, anomalies and exotic particles that will damage the structure of matter. This limit tends to be slightly greater than the mass of a human being larger creatures (bosses), vehicles, dense objects or walls cannot be transported.

In the brief moment before this occurs the matter in contact with the portal will be teleported, unless its mass exceeds the limits of the displacement field. When the portal comes into contact with a significant amount of mass, it will lose enough energy to destabilize and collapse. This process will ionize the air and can result in a form of lightning arcing between the portal and objects that it passes, a hazard that Displacer Cannon operators must be conscious of. The other key component was a nuclear mini-reactor fueled by Uranium-235, also used in the Tau Cannon and Gluon Gun weapons that were developed at Black Mesa.Ī moving Displacer Cannon portal will travel in a straight line in defiance of gravity, teleporting the air and dust particles that it passes through, as they do not significantly deplete the displacement energy. To generate this degree of energy within such a compact device required a Xen crystal or some other imitation with exotic matter properties. The portals generated by Displacer Cannons were somewhat unique compared to other teleportation technology, as they did not have to be maintained by a constant supply of displacement energy instead the displacement field was given a large amount of energy in a concentrated burst, allowing the portal to remain open for some time before the portal’s energy was depleted.

Portal gun in hl2