Cloaking Devices
'avwI' batlh tlhIngan (Klingon Honor Guard)
A cloaking device is an energy screen generator used to render an object (typically, a space vehicle) invisible to the eye and to most sensor systems. This is accomplished by gravitational lensing, the creation of a distorted image of an object when it's light is focused by gravity. In the case of a cloaking device, the light is focused so that the object's index of refraction (the phase velocity of radiation in free space divided by the phase velocity of the same radiation in a specified medium) matches its surroundings, making the object transparent. Cloaking a ship requires precisely balancing the radiative emissions from the warp drive nacelles, dissipating all electromagnetic radiation, gravitational fields and other energy emissions emanating from the ship, and distorting space in such a way that electromagnetic radiation and energy emissions are directed around the ship through subspace at velocities faster than light.
Off-axis warp field controllers balance the radiative emissions from the warp drive nacelles. This is necessary because the power source must be in phase with the cloaking device. These devices are used on warp-capable ships without cloaking devices, as well as warp-capable ships with cloaking devices, because they increase the engine operating efficiency. If any one of these controllers is misaligned, or in some way damaged, it would produce a polarized, magnetic distortion, detectable by other ships' sensors. When a cloaked ship is traveling faster than light in warp, the fact that the ship is moving so quickly makes it difficult to pin-point the location of the ship even if one of the controllers is in some way damaged or misaligned.
Nullifier cores dissipate all electromagnetic radiation and other energy emissions produced by the ship and its crew. This is done by remodulating the energy signature to have the appearence of background energy, as well as reducing the apparent output. The amount of energy required by the nullifier cores to mask a certain amount of energy is not directly proportional to the amount of energy to be masked. For increasingly larger amounts of energy to be masked, the amount of energy required by the nullifier cores to mask that energy comes ever closer to being equal to the amount of energy to be masked. Providing shielding against the entire electromagnetic spectrum is energy-costly, but necessary if a ship is within close proximity. However, if there are no ships within the immediate vicinity, then the nullifier cores are capable of dissipating electromagnetic radiation on the wavelengths that would only be detectable on long-range scanners, ignoring the wavelengths detectable on only short-range scanners. Another necessary function of the nullifier cores is to create a null area of gravity between the ship and the cloaking field, so that any gravity coming from the ship will not interfere with the cloaking field, or be detected by a gravimetric distortion mapping scanner on another ship.
Cloaking generator coils use a coherent graviton emission to distort space so that incidental electromagnetic radiation and other forms of energy are directed around the ship through subspace at velocities faster than light, making the appearance that the light or energy never left its original course. One of the main parts of a cloaking generator coil is a graviton polarity source generator. Graviton polarity source generators create a highly focused spatial distortion which directs the course of the energy and light. The graviton polarity sources in each generator feed into subspace field distortion amplifiers that are phase-synchronized with each other by a network of small conduits that allow field bleed for gravitational stability between the graviton polarity sources. These conduits are equipped with tetryon compositors, to prevent a build-up of tetryons in the conduits, which would decrease the operating efficiency and eventually significantly damage the subspace field distortion amplifiers. The flux energy output is directed and focused by a series of subspace field generator coils, according to the energy dispersal pattern. The energy dispersal pattern, or the energy transformational matrix, is the way in which the energy and light is directed around the ship. The actual subspace field generator coils are similar to warp field coils, but they create a multi-layered field in the space around the ship, not also within it. The propulsive, asymmetrical, peristaltic field distortion propels the energy faster than light. This compensates for the extra distance that the energy has to travel around the ship before returning to its original course, and any red-shift or blue-shift caused by the Doppler Effect, or a gravitational field.
The cloaking generator coils are controlled by special purpose, or dedicated, computers designed to perform this specific task. They are extremely fast computers that contain a complex array of processors, each designed to perform a specific function. These computers must handle huge databases, and perform complex mathematical operations in order to provide an accurate energy dispersal pattern. Input data is provided for the computers by a network of refractometers placed on the hull of the ship. The more refractometers placed on the hull of the ship, the more effective the energy dispersal pattern. The only limiting factor is the speed of the computers, which must provide a realtime energy dispersal pattern to effectively cloak the ship. These computer are completely separate from the computers that perform other ship functions, because they are limited to the specific function built into them.
Magnetic constriction coils create a localized magnetic waveguide plane for the energy to pass through in subspace, which ensures proper alignment of the energy when the ship is in warp. If a ship was using the magnetic constriction coils while not in warp, an active magnetic interferometry scanner could detect the use of the coils.
All of the parts of the cloaking generator coils are powered by plasma coils. These coils must all have an identical energy frequency. This is accomplished by a plasma buffer. If there is no plasma buffer, then the cloaking generator coils could easily be disrupted, by something like an ionic pulse.
Subspace listening posts, gravitic sensor nets and tachyon heterodyne detection grids can be used to track cloaked ships. Subspace listening posts are designed to listen for any subspace radio, subspace field distortions (these indicate the presence of a warp drive), any subspace compression (a possible warp drive malfunction), or subspace shock waves small enough to be undetectable by standard sensor arrays (these indicate a spontaneous warp field collapse.) Subspace relay stations, which boost subspace radio transmissions, can be converted to subspace listening posts without much difficulty.
Gravitic sensor nets are a network of detection devices that are partially effective in detecting cloaked ships. Gravitic sensor nets utilize highly sensitive gravimetric distortion mapping scanners to map the gravitational forces throughout the area in which it would be probable that a cloaked ship would pass. If a cloaked ship's nullifier cores were not creating a complete area of null gravity around the ship, then it would be possible to observe the changes in the space around the ship.
Tachyon heterodyne detection grids are a network of active tachyon beams used to detect cloaked ships passing through the net. Tachyon heterodynes are charged tachyons having alternating currents of two different frequencies that are combined to generate a new frequency equal to the sum or difference of the two.
As a cloak engages and disengages, a momentary gravitational wave forms from the graviton polarity sources, while the subspace field distortion amplifiers phase-synchronize with each other. (Gravitational waves also called gravitational radiation or spatial ripples.) A gravitational wave is a ripple in the curvature of space-time. In other words, it is a propagating gravitational field, or propagating pattern of strain, traveling at the speed of light. It carries energy and can exert forces on matter in its path, producing, for instance, very small vibrations in elastic bodies. As the ripple forms, the ship's inertial damping system will attempt to respond, but, because, on average, the inertial damping system lags 295 milliseconds in response time, there is a slight strain of the physical spaceframe of the craft. If the ripple is fairly limited, no considerable effect will result, but, should the ripple be large, the systems will fail to adequately compensate, and the ripple can cause a significant effect on the ship and crew. This distortion, although the relatively weak interaction between gravitional radiation and matter, can create an effect similar to that of spatial interphase, which alters the neural pathways in the brain, effectively rendering any humanoids exposed to the spatial radiation insane, or worse. Statistically, on a Mark 3.2a (standard Klingon) cloaking device, a ripple large enough that it cannot be adequately compensated for would statistically occur some 0.00007854% (39,271/50,000,000,000) of the time. A build-up of tetryons in the conduits that allow field bleed between the graviton polarity sources will significantly increase the chance of a spatial ripple occuring. A neural disturbance would statistically occur approximately 0.0000001386% of the time, with a 0.000000000341% (341/100,000,000,000,000) chance of complete structural failure due to spatial ripple stress.
In addition to the production of gravitational waves, cloaking devices have several other significant disadvantages. The greatest disadvantage is the tremendous amount of energy required to maintain all of the parts of the cloaking device. If a ship had the ability to generate enough energy to maintain the cloaking device as well as defensive shields, the nullifier cores could neither mask all of the erergy required to accomplish this, nor the interference created by defensive shields. In addition, the spatial distortions created by defensive shields would mean that the shield itself would have to exist within the cloaking field, and the larger the cloaking field is, the more energy is required to generate it. These reasons completely eliminate the possibility of using defensive shields. When a starship's cloaking device is active, several ship's systems operate under special protocols to minimize the interference of the cloaking device.
If the cloaking generator coils distorted space so that all incidental electromagnetic radiation and other forms of energy were directed around the ship, then the sensor systems could not gather any data. As a result, the cloaking generator coils create frequency windows to allow specific wavelengths to pass through the cloaking field at certain times. This limits the gathering of many types of scientific and tactical data, but is adequate for most situations. Active scanners may not be used while the cloaking device is operating.
Federation-type beam weapons (phasers) make use of the rapid nadion effect, while Klingon and Romulan beam weapons (disruptors) use the slow nadion effect. All of these weapons are very disruptive to the cloaking device's plasma coils, even with a plasma buffer, and therefore cannot be used. If a cloaked ship did use their beam weapons, the beam would be bent off course and hit the ship at a diametric point and angle. In addition, the nullifier cores would attempt to dissipate the beam and remodulate its energy signature to give the appearence of background emmisions. The cloaking field would most likely collapse, causing powerful gravitational waves. However, it is possible for a beam weapon to penetrate the cloak from the outside, if it is tuned to the frequency of a window opened in the cloak for sensory input.
Warp drive operation is considerably affected by the cloaking device. The geometry of the warp field must be significantly altered because of the spatial distortions created by the cloaking device. Warp drive control software works in parallel with the cloaking generator coil's dedicated computer to minimize the effect on both systems. The translational field interaction between the cloaking device and the warp drive is somewhat chaotic, creating potentially catastrophic effects, such as a spontaneous collapse of the warp field, or subspace compression. This is why subspace listening posts are an efficient way of tracking cloaked ships.
It is possible to open an interference window in a finely tuned cloak, so that a photon torpedo will pass through, as opposed to being bent off course or even crushed by the gravitational distortion. This interference window is generated, at the moment of firing, by a cloaking generator coil configured to operate on a different frequency than the other cloaking generator coils. This is accomplished by temporarily disconnecting from the plasma buffer the plasma coil powering the cloaking generator coil for the area where the torpedo will leave the cloaking field. The translational field interaction between the cloaking generator coils causes a gap to open in the cloak. The calculations that are necessary to allow the ship to properly cloak after the launch of the torpedo are very complex. As a result, there is a lag in firing, the length of which depends on the speed of the cloaking generator coil's dedicated computer.
Because the navigational deflector radiates significant amounts of both subspace and electromagnetic radiation, it cannot be used when cloaked without an extremely powerful network of nullifier cores, which would consume a considerable amount of energy. Instead of this, a variant of the transporter system is used. This device converts the micrometeorite particulates to energy, lets the energy be directed around the ship as with all of the other light and energy, and then converts the energy back to matter. This method is only used when a ship is in very close proximity. Otherwise the magnetic constriction coils are tuned with the cloaking generator coils to reflect interstellar gases and micrometeoroid particulates. This method is more energy effecient than the method using a variant of the transporter system. Although the transporter system could be tuned to the same frequency as the cloaking device, the gravitational distortions usually prevent usage of the transporter system, except when no danger is imminent, and the proper adjustments in the cloaking field can be made to open a window in the field sufficient to allow a transporter beam to pass through.