According to the latest research report of masakatsu Murakami, an engineer at Osaka University in Japan, and his colleagues, laser bombardment of microtubules can produce a very strong magnetic field, which will be of great significance for basic physics, materials science and astronomy. On October 6, the study was published in the open access journal Science report. < / P > < p > most of the magnetic fields on the earth, even man-made ones, are not particularly strong. Magnetic resonance imaging (MRI) used in hospitals usually produces 1 Tesla (equivalent to 10000 Gauss). In contrast, the magnetic field produced by the compass pointer swinging northward is 0.3-0.5 Gauss, and the magnetic field produced by some magnetic resonance imaging equipment is up to 105 Tesla (105000 Gauss). In 2018, scientists used lasers to create a magnetic field up to 1200 Tesla in the laboratory, and scientists have not exceeded the “limit magnetic field” since. < / P > < p > the latest simulation experiments show that it is possible to produce a 1 million Tesla magnetic field, masakatsu Through computer simulation and modeling experiments, Murakami and his team found that shooting super intense laser pulses in a hollow tube with a diameter of only a few microns can activate electrons on the wall of the tube, causing electrons to jump into the cavity in the center of the hollow tube, and produce centripetal explosion in the hollow tube. The interaction of these hot electrons and the centripetal explosion of hollow tubes lead to the current flow, which forms a magnetic field. The researchers found that in this case, the current can amplify the existing magnetic field by two to three orders of magnitude. < / P > < p > this super magnetic field will not last for a long time and will disappear after about 10 nanoseconds. But for modern physics experiments, this is plenty of time, because modern physics often studies the particles that disappear in an instant and the corresponding conditions. < p > < p > masakatsu Murakami and the research team will further use supercomputer simulation to confirm that these super magnetic fields can be realized by using modern technology. Their calculation shows that under real conditions, it requires a laser system with pulse energy of 0.1-1 joules and a total power of 10-100 gigawatts (1 gigawatt equals 100 trillion Watts). According to a report in Science in 2018, 10 trillion watts of lasers have been deployed in the European extreme light infrastructure, and Chinese scientists intend to build 100 trillion watt lasers, known as “super intense laser stations.”. < / P > < p > ultra strong magnetic fields have many applications in basic physics, including searching for dark matter. American science media have reported that the super magnet can also limit the plasma in the fusion reactor to a smaller area, laying the foundation for future fusion energy. (Ye Qingcheng)= https://ibmwl.com/the-report-shows-that-the-number-of-app-store-purchases-soared-in-the-first-half-of-this-year-due-to-the-impact-of-covid-19/ target=_ blank>The report shows that the number of app store purchases soared in the first half of this year due to the impact of covid-19

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