Settings:

Phasers have three distinct effects on the target. At low power settings - setting 1 to 3 on a hand phaser - the impact of phaser energy is almost wholly limited to simple electromagnetic and mild thermal effects. These are concentrated on the nervous system of the target, causing pain and/or unconsciousness in most beings.

At higher levels the thermal effect becomes prevalent, and the phaser will begin to cause physical damage to the target resulting in moderate or severe injuries. By the time the power level is at setting 7 the energy is distributed equally between thermal and nuclear disruption energy. Disruption effects become widespread, resulting in immediate death to most Humanoid life forms.

Type 1:

This is a small hand unit, approximately the size of a pack of cards. They can fire up to Setting 8, which causes total vaporization of humanoids as 50% of affected matter transitions out of the continuum

Type 2:

This is a larger hand unit. Early models of the type 2 phaser used a type 1 phaser clipped into a pistol grip, but modern weapons seem to have little in common with the smaller model. The modern type 2 phaser can fire up to setting 16, which causes the destruction of some 3,900 metric tons of rock per 0.28 second discharge

Type 3:

The type 3 is a rifle version of the type 2 phaser. It uses a nearly identical "business end" as the type 2, and is also capable of firing to setting 16. The advantages of the type 2 are a 50% greater energy reserve, a multiple target acquisition system and a gyrostabilizer system. Recently the standard type 3 phaser rifle has apparently received the same advanced targeting system as the Heavy phaser rifle

Compression Phaser Rifle:

When the Dominion threat became urgent in late 2370, UFED decided to issue its forces with a new class of heavy rifles to increase the firepower available to them. The Modern Phaser Rifle project would evaluate two competing designs, the Heavy phaser rifle and the Compression phaser rifle. Both would be rushed into service as fast as possible

The Compression rifle concentrated on simplicity. The LiCu 521 discharge crystal was doped with arsenic atoms and trisilinate molecules in order to restrict the phaser energy discharge. The doping materials diverted a small part of the discharging energy to re-establish the charge barrier between the discharge crystal and the Sarium kelleride power crystal, limiting or compressing the beam to a maximum of 200 picoseconds of firing. This would fire the entire energy discharge in a beam of only 6 centimeters length, greatly increasing the intensity of the energy and so enhancing the effect on the target.

Although it was by far the simpler of the two weapons, great difficulties were encountered during the development of the compression rifle. Most of these centered on thermal damage to the discharge crystal resulting from the very high-energy intensities flowing through it. Average firing lifetime of an emitter crystal in the first model developed was only 9.6 nanoseconds - 48 discharges - a far from acceptable figure. Redesign of the shape of the emitter boosted this figure to 28 nanoseconds, still not sufficient for a field weapon. The solution arrived at was to install two high capacity cooling systems, one mounted on either side of the rifle. This boosted the emitter crystals lifetime to 600 nanoseconds, or 3,000 discharges. UFED deemed this just about acceptable and rushed the compression rifle into limited service.

The weapon was never satisfactory - although the cooling systems worked reasonably well they made the weapon heavy and difficult to use properly at long ranges. The emitter crystal was also rather sensitive to adverse environmental conditions, and if not treated carefully cracking could occur - a breakdown, which would lead to a thermal explosion on the next discharge. Although it was issued to some ground forces units and to the four units of the Intrepid class Starship then in service, several thermal explosion accidents forced UFED to withdraw the compression rifle shortly after it entered service in 2371. None now remain in use

Heavy Phaser Rifle:

The heavy phaser rifle was to be a much larger, more sophisticated weapon than its compression rifle rival. It is capable of firing phaser energy in either beams or pulses of variable length. Rather than tamper with the materials in the discharge crystal, the design team built a small isolinear artificial intelligence unit into the rifle, which had complete control of the energy discharge. This approach met with considerable success in a testing program that was surprisingly free of difficulties. The use of a computer control system also allows the beam characteristics to be modified much more easily than in previous phaser rifles, a measure clearly important when dealing with the Borg.

The heavy rifle also includes a much more effective and elaborate targeting system, a more powerful gyrostabilizer, and a larger energy reserve. The rifle can fire to a maximum of Setting 18. The targeting unit is now being retrofitted into earlier models of phaser rifle. The first model of heavy phaser rifle had a duranium alloy metal stiffening to the barrel, but in service this has proved to be unnecessary and a subsequent model was issued without this feature.

Type 4:

The type 4 phaser is a medium sized device fitted to small vehicles such as shuttlecraft.

As of 2364 this was the heaviest weapon in use aboard Federation vessels, comprising the main armament of the Galaxy class Starship

Type 10:

Previously designated as the 'Type 10+' for security reasons, the Type 12 phaser has been used in dedicated planetary defense arrays and as the main armament of heavy fortified Starbases since 2263. It was considered that the Type 12 was unsuitable for use on a Starship platform because the energy requirements of the array where too high and the supporting hardware too bulky. However, by 2268 the power plant of the Sovereign class had grown large enough to support Type 12 arrays in place of the planned Type 10 models; technical improvements had also allowed for considerable shrinkage in the size of the equipment. The main phaser armament of the new Sovereign class Starship therefore comprises Type 12 phaser arrays as does the armament of the Prometheus class currently under development. These are the most powerful phaser weapons currently in use by the Federation

Type 12:

It has long been recognized that the initial impact of a phaser strike on a shield system is the most damaging part of the firing sequence. Many cultures have sought to increase weapon effectiveness against shields by developing pulse cannon - that is, weapons which fire large numbers of tightly packaged bursts rather than a continuous stream. Early Federation vessels such as the Constitution class where equipped with such pulse cannon, but the weapon is not without its drawbacks; the hardware involved tends to be very difficult to manage precisely, resulting in much poorer control over the beam characteristics. The Federations Starship design ethic has always stressed that full control must be maintained over all weapons at all times, in order to allow non lethal force to be used in Starship combat situations; in addition, many scientific experiments use weapon systems to apply energy in controlled amounts to external phenomena in order to study reactions. Given this, the Federation gradually moved away from pulse cannon. The refit given to the Constitutions in the 2230's removed the pulse firing feature from that class, equipping them with a 'rapid burst mode' which was something of a compromise between pulse and continuous phaser beams. Further designs continued to de-emphasize the pulse-firing feature, although all basic phaser hardware is capable of firing relatively short bursts and this has remained a feature of Federation combat tactics

With the development of the USS Defiant, the pulse phaser cannon was finally reintroduced to UFED. Defiant is a warship, pure and simple; her designers had no real interest in conducting experiments, and the attitude towards the level of lethality of her armament could perhaps best be summed up by the phrase 'take no prisoners'! Defiant's main armament comprises four heavy pulse cannon, which fire very tightly confined bursts of phaser energy for maximum impact on shielding systems. High overall energy delivered over a very short period combines with a high firing rate to produce a performance against modern shield systems which can best be described as devastating