Force Field Technology

As New Diasporia is intended to establish a game universe rather than a particular game system this section will not give particular game stats. Since such systems are superscience rather than based on a particular real world technology I will probably followup with a set of proposed rules which can be integrated into a GURPS rule set (since that's what I use.) Feel free to modify those rules to fit in your own favorite rule set as the broad tech specs are more important than the rule specifics.
Force field technology is a spin off of gravitic technology. The primary improvement in the transition from TL B to TL A is a reduction in size of available force field projectors from the vehicle to the man portable size.
There are two primary parameters of a force field which can be manipulated to give it variant characteristics and two modes in which it can operate. Other specifications of a force field are its defensive factor or how much damage it can take and the area it covers.
The operational modes are ablative and absorbent. The two parameters are permeability and transparency. 
In ablative mode a force field will weaken by a specific amount every time it is struck. It will also regenerate by a certain amount for every second it is not under attack until it returns to its rated strength.
In absorbent mode a force field will convert the kinetic or directed energy with which it is attacked into stored energy, typically in a set of power cells, though the energy can be redirected to any use, include into powering the force field itself. Once a force field in absorbent mode has filled its energy sink it will continue to store the attacking energy in the field until it experiences a catastrophic failure. Such a field will appear black from the outside (unless it is adjusted to pass visible light) it will then change color though the visible spectrum [red, orange, yellow, green, blue, indigo, violet] until it explodes, destroying all within and quite a bit outside.
By adjusting the permeability of a force field the user can make it sealed, in which case a life support system will be need to survive. Or it can be adjusted to allow gases to pass but still repel rain. A nuanced adjustment will allow people or even vehicles to penetrate, but prevent high speed projectiles or high energy particles from penetrating.
By adjusting the transparency, or rather by opening a window to a specific part of the electromagnetic spectrum the user of a force field can prevent laser weapons from penetrating the field. It is typical in absorbent mode to allow all visible light to penetrate the field by only absorbing some of the light, allowing the user to see out, but no one to see in. It is possible to allow a wider spectrum of electromagnetic energy to penetrate the field allowing the use of PESA and AESA sensors with the field on. By careful manipulation of the transparency settings a force field can act as a distortion field making the field and all it contains invisible to most sensors, but not gravscanners.
By adjusting  the permeability of the field it is even possible to fire missiles or railguns through a force field while denying penetration to energy weapons.
It is possible to build force field projectors which are locked into certain settings. In this way a balcony can have a rain shield or an airlock portal allow vehicles or individuals to pass while retaining atmosphere.
A planer force field is called a ward. Such a field can be established in a doorway or window. If established between two walls or in a strut such a field can provide increase structural integrity, making the structure stronger than would be possible with standard materials.
A conformal field is established along the surface of a person or object and follows the shape of the user. Conformal fields are flexible from the inside, but ridged and slippery to matter from the outside. Touching a force field can be an unpleasant experience if it is sealed.
Personal force fields are available at TL A. Such a device is not capable of operating in absorbent mode, because it is not yet possible to scale the appropriate projector technology small enough yet.