Voyage of the Stars

Whenever a new technology appears, humans can always think of using it in war.

Perhaps it was also the result of worries about war. When the positron cannon appeared, the top brass of the Ministry of Armed Forces considered defense issues, but unfortunately, no normal material could resist hard steel positrons.

Therefore, when the super strong magnetic field appeared, the long-dusted discussion topic was brought back again.

Positron cannons are positron cluster weapons that can defend against charged particles. Naturally, it is easy to think of magnetic fields.

I learned in junior high school or ninth grade that charged particles moving in a magnetic field will be affected by the Lorentz force.

The direction of the Lorentz force follows the left-hand rule.

So it is easy to imagine the working principle of the magnetic shield, which is to install two or more magnetic field generators on the warship, and then adjust the parameters of the magnetic field generator according to factors such as orientation, thereby forming a large magnetic field that wraps the warship.

The technology has been achieved, but it is still a complex project.

Just like after you have reinforced concrete manufacturing technology, if you want to build a building, you still have to carry out various designs.

The same goes for magnetic field shields.

As we all know, charged particles entering the magnetic field in different directions will have different motion properties. The first is when the charged particles enter the magnetic field parallel to the magnetic field. In this case, the particles are not affected by the Lorentz force, so they move in a straight line at a constant speed.

The second step is to enter the magnetic field perpendicularly. In this case, the Lorentz force is always perpendicular to the velocity and acts as a centripetal force. Therefore, the charged particles will perform uniform circular motion under the action of the Lorentz force.

The third type is entering the magnetic field neither perpendicularly nor parallelly. In this case, the velocity needs to be split into the direction along the magnetic field and the direction perpendicular to the magnetic field. After analyzing the components and combining them, it will be found that the resultant motion in this case is equidistant. Spiral motion, the trajectory is similar to that of a spring.

Compared with the first and second types, the third type is more suitable for complex combat environments. After all, no one can guarantee that the particle flow fired by the opponent is perpendicular to the magnetic field you set.

Of course, a real magnetic field shield is much more complicated than the third type, and it is not just a matter of getting a magnetic field generator.

Because it is necessary to consider that positron beams are injected from all directions, when human scientists designed magnetic field shields, they added many adjustable magnetic field line direction parameters to several magnetic field generators, and it cannot be just a single magnetic field.

Not only that, several magnetic field generators also need to meet the magnetic field lines between each other to form a larger magnetic field, rather than a chaotic magnetic field.

As a result, the design requirements are higher by an unknown number of levels.

Various parameters must be incredibly accurate, such as where to place the magnetic field generator, which of the several magnetic field generators needs to produce a stronger magnetic field, and how to fine-tune the direction of the magnetic field lines when the warship moves or turns.

Such things require scientists to conduct repeated experiments. It is necessary to start with an experimental model and a small magnetic field. Only after obtaining these complete parameters can we start to create a magnetic field generator that is actually used on warships. It's impossible to say that it can be built, so just make a large magnetic field and put it on the warship.

In addition, humans also need to consider one thing, and that is the issue of magnetization.

The so-called magnetization is the phenomenon that under the action of a magnetic field, the orientation of the magnetic moments in the material tends to be consistent and it exhibits a certain degree of magnetism.

This is a very troublesome problem for mankind.

Contrary to people's imagination that only iron can be magnetized, in fact, everything can be magnetized. Because almost all matter in our universe has a magnetic moment.

As mentioned before, a strong magnetic field laboratory can levitate frogs. This is actually the frog being magnetized in a magnetic field with a strength of 16T.

The magnetic field shield suitable for battleships is much stronger than this magnetic field, so humans have to consider the issue of magnetization of everything in the battleship, including the human body.

It can be said that if the magnetization phenomenon is not considered. Then once the magnetic field shield is opened, all the equipment and personnel inside the warship will be magnetized before the opponent's positron cannon is fired. All electronic equipment will malfunction as a result, and people exposed to the strong magnetic field will die as a result. .

If he was killed by his own shield, then the joke would be too big.

Therefore, if a warship wants to install a magnetic field shield, it must make all preparations to prevent magnetization.

So how to do it?

This certainly does not trouble human scientists. Preventing magnetization means shielding electromagnetic fields, so the first thing scientists think of is magnetic shielding materials.

As the saying goes, only magic can defeat magic.

Human beings use strong currents to generate strong magnetic fields to obtain magnetic field shields. Then the only thing that can shield this electromagnetic field is the electromagnetic field.

As you can imagine, this electromagnetic shielding material is also made of metal materials.

The basic principle is to confine electromagnetic waves to a certain area through shielding bodies such as shells, boxes, and plates made of metal.

Of course, magnetically shielding the entire interior is far more complicated than this.

Scientists need to know all the information about the magnetic field source, including where in space it generates the field, whether it is a single field or a superposition of multiple fields, where the dividing point between the far field and the near field is, the characteristics of the field source and the propagation characteristics. How different, the energy density of the field source, etc.

After mastering various parameters, scientists can analyze the fields generated by electric dipoles and magnetic poles, and then obtain the far and near fields, wave resistance, and field characteristics of the actual field sources, thereby providing various responses to the shielding field. parameter.

In this way, shielding materials, or shielders, that match the magnetic field shield can be produced.

Yes, it is both a material and a device, because the principle of magnetic shielding is to use high magnetic permeability materials to form a magnetic circuit, allowing the interference magnetic field to pass through the shield, thereby avoiding the interference of the interference magnetic field on the outside of the shield.

Specifically, when the shield is close to the magnetic field source, it will sense the magnetic field of the magnetic field source and generate a corresponding induced current in the shield.

This current will form an opposite magnetic field in the shield, and the opposite magnetic field will weaken the magnetic field interference in the shield from the external magnetic field source, thereby achieving a magnetic shielding effect.

Therefore, magnetic shielding and magnetic field shielding must be under the same system. Because on the battlefield, the magnetic field shield cannot always maintain the same direction of magnetic field lines.

And this so-called magnetic shielding material is actually a superconducting material.

Therefore, it is obvious that the magnetic shield generator cannot be placed in the center of the battleship.

In the engineer's design, the magnetic field shield generators should be distributed in the front, rear, upper and lower positions of the battleship, outside the inner cabin and various equipment compartments of the battleship.

So obviously, the layout of a warship equipped with a magnetic field shield should be like this. The outermost layer is the armor layer. Various weapons and detectors are embedded in the armor layer. Inward from the armor layer is the mezzanine where the magnetic field generator is located. Going inside is the magnetic shielding layer made of superconducting material, then the shipboard equipment layer, then various heat insulation layers, radiation protection layers, and finally the personnel activity layer.