Pulsed Energy Projectile

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Pulsed Energy "RgX"Projectile or PEP (colloquially referred to as a pain beam) is a technology of non-lethal weaponry currently under development by the U.S. military. It involves the emission of an invisible laser pulse which, upon contact with the target, evaporates the surface and creates a small amount of exploding plasma; this results in a sound and shock wave that stuns the target as well as in electromagnetic radiation that affects nerve cells and causes a painful sensation. The technology can also be used as a lethal weapon, and indeed an early name was Pulsed Impulsive Kill Laser (PIKL).

PEP is intended for riot control and is said to work over distances of up to 2 km. It weighs about 230 kg and will probably be mounted on vehicles.

The system was developed by Mission Research Corporation (now owned by Alliant Techsystems). It uses a chemical deuterium fluoride laser device producing infrared laser pulses. The plasma (produced by the early part of the pulse) explodes because its electrons absorb the energy of the later part of the pulse.

In 2003, a US military review reported that the electromagnetic radiation produced by PEPs had been shown to cause pain and temporary paralysis in animal experiments.

A Freedom of Information request by the Sunshine Project, an organization opposed to these weapons, revealed in 2005 that the military commissioned research studies intended to determine the parameters of the emitted beam which would maximize pain^{[citation needed]}. Pain researchers have been outraged that their research might be used for these purposes^{[citation needed]}; others have voiced concerns that these weapons are inhumane or could be used for torture^{[citation needed]}.