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Bringing the Synchrotron Light Out of the Ring

By A. P. Sabersky


The ‘SLAC storage ring, SPEAR, emits up to 150 kW per beam of synchrotron radiation. The power density on components inside the ring reaches 1 kW per cm2, so iransparent windows struck directly by the synchrotron radiation are out of the question. Only 5 x 113~ ~ of the total radiated power is visible light at 1.5 GeV. This power can be absorbed before the light passes through a window by having the radiation strike a metal mirror from which the visible light is reflected and in which the x-rays are absorbed. We then face the problem of thermal deformation of the, mirror. The x-ray power is concentrated in an angular cone of approximately 0.2 mrad width in the vertical plane, while the visible light has a divergence of 4 mrad. A slot in the mirror.would pass the x-rays, and avoid most of the heating problems, but this is relatively impractical for a fixed mirror, since the vertical position of the beam is uncertain

Year: 1973
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