Obtaining the Wakefield Due to Cell - to - Cell Misalignments in a Linear Accelerator Structure ∗
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چکیده
منابع مشابه
Random Walk Model for Cell-to-cell Misalignments in Accelerator Structures
Due to manufacturing and construction errors, cells in accelerator structures can be misaligned relative to each other. As a consequence, the beam generates a transverse wake eld even when it passes through the structure on axis. The most important e ect is the long-range transverse wake eld that de ects the bunches and causes growth of the bunch train projected emittance. In this paper, the e ...
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We study some effects of cell misalignments in accelerator structures in which each cell is displaced the same amount and direction but with sign which alternates from cell to cell. In particular we study the manifold radiation in a damped detuned structure (DDS1) and wakefield effects in a uniform constant impedance structure. A synchronous wave aliasing phenomenon is observed. In previous tre...
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Emittance growth of accelerated beams in the 50 GeV linear accelerator of the Stanford Linear Collider (SLC) arises from the effects of transverse wakefields and momentum dispersion. These effects are caused by small misalignments of the beam position monitors, lattice quadrupoles, and accelerating structure and by the energy specnum of the beam which changes along the accelerator. The introduc...
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Transverse wakefield kicks from misaligned accelerating structures in the SLC linac contribute significantly to emittance growth. If these kicks could be measured directly, it would be possible to align and/or steer the beam to a kick-free trajectory. In the Accelerator Structure Test Facility at SLAC, ASSET [1], the kicks due to a drive bunch are measured with a witness bunch at varying bunch ...
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A multi-bunch beam, traversing travelling wave accelerator structures, each with a 5π/6 phase advance per cell, is accelerated at a frequency that is synchronous with the fundamental mode frequency. As per design, the main interaction occurs at the working frequency of 11.424 GHz. However, modes with frequencies surrounding the dominant accelerating mode are also excited and these give rise to ...
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