| Budget Amount *help |
¥18,980,000 (Direct Cost: ¥14,600,000、Indirect Cost: ¥4,380,000)
Fiscal Year 2019: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2018: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
Fiscal Year 2017: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
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| Outline of Final Research Achievements |
The vacuum was excited by an intense electromagnetic field of 5e18 W/cm2 (equivalent to a magnetic field of 15,000 T) generated by focusing a high intensity laser (0.6 TW) synchronized with the SACLA XFEL to about 2 μm, and macroscopic refractive index changes were explored using the XFEL as a probe. During the 2019 beamtime, the intense laser was focused near the diffraction limit using wavefront-compensating optics, and the XFEL was focused using a Si beam shaper to suppress the increase in angular divergence. We performed a prototype experiment and obtained the world's first result of vacuum diffraction experiment that is 18 orders of magnitude closer to the prediction of quantum electrodynamics.
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