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The HERA accelerator facility consists of independent accelerators designed to store respectively 820-GeV protons and 30-GeV electrons. The two counterrotating beams collide head on in up to four interaction regions, which are distributed uniformly around the accelerator circumference of 6336 m. In the arcs of the ring the protons are guided and focused by some 650 superconducting dipole and quadrupole magnets and more than 1500 superconducting correction coils. In the straight sections around the intersection points the proton beam is guided by about 120 normal conducting magnets.
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R. Meinke (1991) studied this question.
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