Unformatted text preview: magnets is about 6 Tesla. Assume an accelerator that follows the earth’s equator. What is the maximum beam energy for protons in such a machine? • Consider two lenses of focal length f, one focusing, and the other defocusing. Show that the combination of the two lenses separated by a distance, d, with d<f, is always focusing, independent of whether the focusing or defocusing lens comes first. This is equivalent to showing that a quadrupole doublet with focusing and defocusing planes rotated by 90 degrees will have a net focusing effect. Hint: use the thing lens approximation and your favorite optics textbook (e.g. Hecht)...
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 Fall '11
 ENO
 Physics, Charge, Work, Magnet, maximum beam energy, currently available superconducting, favorite optics textbook

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