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Japan is going through one of the most crucial transformations in recent decades: that of its rearmament. It is its most aggressive defense policy since Second World Warand the Ministry of Defense justifies because we are in the “most severe and complex phase of the last 80 years.” And there is nothing that better exemplifies Japanese rearmament than a cannon that, until not long agoit was science fiction material. The electromagnetic cannon. Reconfiguration. Starting in the 1990s, Japan stopped investing significantly in its Self-Defense Forces. He economic bubble burstthe “lost decade” and demographic difficulties implied that the military spending of 1% of GDP that they adopted after the Constitution of 1947 would be maintained. In 2023, things changed. As a result of geopolitical complexity, they decided that they would invest 2% of their GDP in rearmament. In figures, we are talking about about 271,000 million euros until 2027, but recently The target has been brought forward to March 2026. This reconfiguration will manifest itself in four dimensions: the aforementioned increase in military spending, the restructuring of the Self-Defense Forces, a relaxation of restrictions on the export of weapons and the expansion of long-range offensive capabilities. That’s where the railgun comes into play. Electromagnetic cannon. Like gunpowder, it fires a projectile that gains speed as it passes through a barrel. However, it uses electricity instead of gunpowder. Two metal rails form a circuit that, when closed by the projectile, generates an intense magnetic field. This produces a beastly force that propels the projectile at high speed, allowing hypersonic, precise and long-range shots. This speed would allow that would travel without detour even in the most unfavorable weather conditions. Japan has been investing in this field since mid of the 2010s, and a few weeks ago, the Japan Acquisition, Technology and Logistics Agency (ATLA) performed the first proof documented firing of a naval electromagnetic cannon at a real ship. Mounted in it JS Asuka test shipthe prototype is a cannon of 40 millimeters in caliber and six meters in length. It requires four huge energy containers to power the weapon and the projectiles used were small missiles of about 320 grams, stabilized by fins and without an explosive head. There is no need for an explosion: upon reaching those 2,300 meters per second, the kinetic energy is comparable to that of a 1,000 kilo car crashing into something at 140 km/h. Success. During them, the system achieved a record by firing projectiles at a speed of 2,300 meters per second. It is a speed of Mach 6-7, but in addition, they also pushed the useful life of the barrel to the limit. The estimate was about 120 shots, since it was established in previous phases of the investigation, but they got perform more than 200 shots without the system failing. ATLA had conducted open sea tests before, but never against a real target. And although they had already commented that the tests were a success, now they have shared photographs in which you can see the holes left by these projectiles. The target ship was in motion, but due to the enormous speed and stability of the projectiles thanks to the enormous power of the system, the entry holes allow an almost perfect view of the “cross” left by the projectile passing through the hull. Challenges. Now, understanding how a railgun works is easy, but executing it is extremely complex. It is a brutal technical challenge due to several factors: The stability of the barrel: the system generates tremendous heat, so dissipation systems must be effective enough not to compromise the integrity of the barrel. Wear and tear not only affects the speed and accuracy of the projectile, but can cause accidents on the boat itself. The energy: since it requires so much electricity to operate, it must have storage systems large enough to allow it to operate with the necessary power and during intense fire sessions. Miniaturization of the system: these cannons are extremely large and, although ATLA has managed to contain it quite a bit, mounting them on ships is not easy due to both the length of the cannon itself and the set of batteries required. Integrating a railgun into a ship is not easy. Perspectives. Currently, ATLA is working on evolving a system which might not be as far from the action as was thought a few months ago, and this miniaturization would allow it to be mounted on other types of vehicles, in addition to ground defense lines. But apart from as a weapon, the agency has mentioned that the concept of electromagnetic acceleration could be applied to other areas. For example, to the “mass throwers” ​​that would allow launching materials electromagnetically in space transportation. The problem is that other challenges are added, such as the imperative need to calculate the trajectory millimetrically or develop recovery methods for these goods. USA and China. And, although it may seem like another test of weapons, what Japan has achieved is a milestone. After fifteen years of research and some 500 million dollars invested in the technology, The United States left in 2021 the development of electromagnetic railguns (although they are now with larger versions). Japan has persevered and its testing demonstrates that the system can be viable in a real-world context. And another that has continued to develop this technology is China. They are keeping it more secret, but we have already seen images of Chinese ships with an electromagnetic cannon and power containers on the front. And that, precisely, it was these two countries that They are taking steps forward when developing this technology It’s not a coincidence. They are both engrossed in technological warbut also in a escalation of military tension that has been going on for months and that is leading both countries to accuse each other of invading their respective territory. Images | ATLA, Japan Maritime Self-Defense Force In Xataka | Taiwan has had an idea if Beijing invades it: surprise China underground