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The development of long, tunable structures is critical to increasing energygain in laser-driven dielectric accelerators (DLAs). Here we combinepulse-front-tilt illumination with slab-geometry structures assembled byprecisely aligning off-the-shelf 4~mm long transmission gratings to achieve upto 200 keV energy modulation for 6 MeV injected electrons. The effectiveinteraction length is longer than 1~mm, limited by dephasing of the acceleratedparticles in the structure. The piezo-based independent mounting system for thegratings allows tuning of the gap and field distribution inside the structure.

Extended Interaction Length Laser-Driven Acceleration in a Tunable Dielectric Structure