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TUT3AH4 |
Coherent Wave Excitation in a High Current Storage Ring | |
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Funding: Work supported by the U.S. Department of Energy under contract number DE-AC02-76SF00515 We will discuss the fine structure of the forces acting on a particle in a bunch moving in a storage ring. These forces are due to coherent electromagnetic fields, which are excited by a charged bunch, moving along a curved path; or due to diffraction of its own electromagnetic field on irregularities of the metal beam pipe. Transverse forces have much in common, in spite of the different way of excitation. The strength of coherent fields is proportional to the square of the number of particles in the bunch. In case of a large beam current backward reaction of these fields will play an important role in the dynamics of the beam on one side and on the other side it leads to heating of the various elements of the beam pipe. Some part of these fields, electromagnetic waves with frequencies above the cut-out frequency can propagate over long distances in the ring and to be absorbed by some materials with low conductivity. Without proper cooling, the temperature rise can be so great that small pieces of metal (e.g., shielding fingers) can be melted. Additional effects can the spark and increasing the vacuum pressure. |
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