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内容記述 |
A Relativistic Flying Mirror (RFM) is a wake wave near the breaking threshold,created by a high-power laser pulse (Driver) in an underdense plasma. A counterpropagating laser pulse (Source) can be partially reflected by the mirror with itswavelength and pulse duration compressed due to the double Doppler effect. The RFM is predicted to accelerate because of plasma density gradients and Driver pulse evolution.Here, we report on an experimental campaign at ELI-Beamlines aimed at generating and characterizing RFM acceleration using the L3 high-power laser system . The L3 laser was split into two pulses acting as the Driver and Source, respectively. The RFM was formed by the Driver pulse, while the counter-propagating Source pulse was aligned for reflection from the RFM. To enable acceleration measurement, the temporal profile of the Source pulse had a modulated shape before interacting with the RFM. By analyzing the reflected XUV signals, we observed two distinct wavelengths corresponding to different γfactors, indicating mirror acceleration in well-aligned shots. These results provide new insights to wake wave dynamics, control of coherent attosecond X-ray pulse generation, and a potential pathway toward laboratory analog black holes. |
