Abstract: An electron accelerator of the microtron type, housing a vacuum chamber with two spaced apart, nearly parallel, flat pole pieces, between which a static, substantially homogeneous magnetic field is maintainable, a microwave resonating cavity interposed between the pole pieces, a source for supplying electrons and injecting them into the accelerator, said electrons moving in circular orbits in a plane parallel to the pole pieces under the influence of the homogeneous magnetic field and undergoing acceleration at each crossing of the microwave resonating cavity, as well as a device for withdrawing the electrons from the accelerator after they have been sufficiently accelerated, said source for injecting electrons ensuring source of electrons through one of the pole pieces, at an angle to the circular orbits of the electrons, and including a deflecting magnet interposed between the pole pieces for deflecting the injected beam into the plane of the circular orbits of the electrons.

Abstract: A gas laser for emitting ultraviolet laser light with a wave length of 248-249 nm, the gas mixture in the resonance chamber containing krypton, fluor or a fluor compound, and argon in such quantities that at room temperature the partial argon pressure exceeds 0.5 bar and the partial pressure of krypton and fluor or the fluor compound is smaller than 0.2 bar. The gas mixture in the resonance chamber also contains neon in such a quantity that its partial pressure at room temperature is at least equal to that of the argon.

Abstract: A high power pulsed laser set-up comprising a laser-tube and a generator, screened at least transversely from the environment, by a housing that forms a conductor for one of the electrodes of the tube.