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Proceedings Particle Accelerator Conference
Dipole vacuum chambers for the PEP-II HER, fabricated from copper extrusions, must follow the arc of the electron beam in order to minimize impedance losses. The 165 m bend radius requires that the chambers have a sagitta of 25 mm over each 5.84 m length. Stretchforming provides a relatively smooth continuous bend radius and results in low overall residual stresses. Structural analyses of the chamber during the forming process are discussed. These analyses are used to estimate the residualdoi:10.1109/pac.1995.505451 fatcat:ggxwueyzs5ejlbj5tqv2fltbwy