15 miles away.

The high platform of the steel frame stands in the white snowfield, and it looks like the creation of this era - the dense exposed structure, the beams and steel ropes hanging with the ice cone, and the barbed wire fence surrounded by layers, all reveal the beauty of industry.

Hundreds of people were busy around him, preparing for the detonation.

Since the weight of the whole principle device is close to ten tons, the hummingbird has gone to the front line, so it is impossible to complete the assembly in Winterfell, and the parts can only be dragged to the test explosion site and assembled on site.

Fortunately, its structure itself is very simple, and the design has considered the need to split transportation, and the requirements for workers are not high.

This is also the difference between the "spring of the sun" and other weapons - even if the site and equipment have been arranged, it will still take a day or two to complete the final preparations.

Roland and Anna were standing at the top of the tower, directing the assembly of the device.

"Next is the core component of the third, pay attention to the direction of the interface, carefully bump!"

“Everyone listen to my orders!Three, two, one!”

With the trumpet of the worker captain, a silver-white cylinder was slowly pushed into the device.

It was not until this step was completed that Roland slowly relaxed.

The cylinder is loaded with the main energy source of the test explosion - two blocks of uranium-235 column, of which the mass of a single block is 20 kilograms.When combined, a total charge of 40 kg of mass will be provided.This value is below the critical limit of 53 kg, and in theory there is no drastic fission reaction, but as he said before, the criticality is not a fixed value.

Shape, temperature, pressure and other conditions may make this value change, which is the reason why "nuclear weapons" relying purely on pile materials have almost no practical value.For example, 52 kilograms of uranium 235 in the sphere seems to be stable, but it is actually a volcano that is about to erupt.Even a little impact or vibration may make it cross the critical.

Similarly, using multiple small uranium blocks, although safe, will also make the detonation difficulty exponentially - when several uranium blocks are integrated into one moment, the whole can indeed exceed the critical point, and the high temperature generated by the fission reaction will cause the uranium block to expand rapidly, reduce its density in disguise, and the violent explosion will push the raw material far away, so that the reaction is interrupted.

In short, a reasonable configuration should not only allow uranium to reach the critical point, but also maintain it in this state for as long as possible in order to exert the power of the fission reaction.

The gun type is called the gun type because its principle is very similar to the ancient musket, and through the detonation of explosives, one piece of uranium is pushed to another.Under great pressure, the density of the uranium block increases rapidly, even if it is slightly lower in mass, it can cross the critical point.

When the device's housing was connected, Anna personally inserted a can of encapsulated with a warning sign of the radioactive source into the reserved tail interface.

This is also the last key component of the test explosion.

For a moment, Roland felt as if his face had been pierced by something, and even his breath stopped for half a shot.

“Bronze-Bronium neutron source.”

Like its name, it provides a large number of free neutrons for fission and is the most direct way to reduce the critical value.Inside the can-like metal container, there is a row of hollow balls - each ball is similar in size to the ping-pong ball, the core is a marble-like polonium ball, and is tightly wrapped in gold foil, and it is surrounded by a circle of honeycomb beryllium.

When the uranium block collides, it will also be slapped with a small jar at the bottom of the "barrier", all the hollow balls will be weighed thinly thicker than the paper by the violent explosive gas, and after the gold foil rupture, the beryllium will be intimately attached to the polonium ball, and the alpha particles released by the latter will be fully absorbed, and then the neutrons will be fired several times.

These neutrons will participate in the fission reaction of uranium 235, and if they are lucky, they can consume more than 10% of the raw materials before the reaction is terminated, which will greatly increase the power of nuclear weapons.

Since the polonium 210 has a half-life of only 138 days, providing a replacement interface is an essential design.In addition, it is extremely dangerous to keep the neutron source in the weapon for a long time, after all, the polonium beryllium can be self-issued as long as it touches, and once the gold foil is damaged, the consequences are unimaginable.

After the polonium bean neutron source is loaded into the principle device, it becomes a monster that is likely to engulf everyone on the scene at any time from a mild harmless thing.

Although Roland knew that his feelings were only an illusion, it was impossible for a person to capture the change in the number of neutrons in the environment, but his breathing was still subconsciously lowered a lot.

At this point, the principle device is considered to have officially completed all the preparations before detonation.

Anna took hold of his hand.

“Order it.”

In the other side's calm and steady eyes, Roland nodded slightly.

Regardless of the outcome, the Sun’s glomeration program has finally come to this point.

After this step, humanity will move to a new field.

He looked at Sean, "Send my order, notify the command post, count down the six hours of fire!"

“Follow me, your majesty!”

"6:00"

“Oooh-”

"The No. 1 device has entered the ignition waiting stage, repeated, the No. 1 device has entered the ignition waiting stage, please immediately pack up the staff in the field, and leave the scene in an orderly manner in accordance with the exercise plan!"Note that this is not an exercise, the test site will be closed in an hour, and everyone must withdraw to safety before then!”

Soon, evacuation notices were heard along with the alarm.

"Quickly, everyone to the open space in front of the tower, don't pull a person!"

"Construction of the second team report, one, two, three..."

“The test-opening gate is blocked!”

“The whole team of the divinely punished witch team arrived and began to lead the team out.”

The quiet snowfield seemed to boil, and the cries of people were contrasted with the sound of alarms repeated over and over again, and the atmosphere became tense and heavy for a moment.Everyone knows in their hearts that they are about to witness an unprecedented experiment.

"3:00"

At the command post, Roland and Anna pulled out two keys and opened the cover of the console.

When a switch is pressed, the green light on the countertop is also lit in turn.

“The main cable is delivering electricity!”

"The first day of the mystery moon is working normally, and the load is steadily rising."

"Now switch to line one."

"Understand, once the line is connected, the principle device power is normal!"

Observers loudly reported the operation of the detonation system until the last green light was on, which meant that the current had been transmitted to a platform 15 kilometers away through multiple boosts.

“1:00”

An alarm was also sounded over the command post, which meant that there was only one final hour left in the detonation process.

The doors and windows of the bunker are all closed, and the oil lamp is also choked one by one to avoid accidents caused by vibration.

The winter high-rise entered a special observation room, and according to Roland's instructions, its facade was built into a trapezoid to better resist the shock wave, while the internal end was deepened to accommodate the huge body of the original carrier.

Pasha and the Tachira Witch had been waiting for a long time.

"0:15"

The sky is getting darker.

The last alarm finally arrived.

Whether it is high-level, soldier or worker, according to the content of the previous exercise, wears black sunglasses against strong light.

Although most people do not understand why, in this dark snow day, but also wear this eyeglasses that hinder the line of sight.

It's not all you can see.

"0:05"

Countdown, five minutes!

When the announcement sounded again, the scene became silent.

All communication and discussion have been suspended, and everyone stared at the dark front and held their breath involuntarily.

“Three minutes to count!”

Roland felt a deep sweat in his hand.

Anna smiled and looked at him and held him lightly.

“One minute to count!”

There was also a hand on the other side, and then the five fingers were stacked.

“Ten seconds to count!”

“Nine!”

Although it is a pity that it is impossible to press the detonation key himself, Roland knows that this long historical road has just begun.

“Three!”

“Two!”

“One!”

“The explosion!”

The snow in the distance was quiet, and nothing seemed to happen—time seemed to solidify at this moment, as if it had been a long time, and it seemed as if it were only a short moment.

Then a very dazzling blue light bloomed from the horizon, and in an instant it was torn to pieces the darkness in front of you!