Laser wakefield accelerators can be an alternative to huge linear accelerators and cyclotrons. Electron bunches with 150-200 MeV energies are needed for Very High Energy Electron radiotherapy. Injection of electrons and their acceleration take place when the focused laser beam interacts with a gas plasma target. We utilise a combined laser micromachining technology with short-pulse and ultra-short-pulse lasers to manufacture complex gas nozzles in fused silica. TW-class lasers are able to accelerate electrons to high energies in a very short distance. A stable operation with electron energy around 3 MeV was demonstrated at a 1 kHz repetition rate. Flexibility in 3D carving within fused silica with lasers allows tailoring plasma targets to particular beams of ultra-high intensity lasers and achieving high energy of accelerated electrons with low energy spread and divergence. Electron energy above 100 MeV could be achieved using new kHz-class OPCPA lasers operating at pulse energy >50 mJ.
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