منابع مشابه
Beam Loading in Rf Cavities
Beam loading is the conventional term for the effect of beam passage through an RF cavity installed for the control of some beam parameters such as energy, bunch length, energy spread, etc... The fields developed in such a structure and their effect on the beam can be analyzed as for all other discontinuities of the vacuum chamber. In particular, F. Sacherer's theory of impedances and beam inst...
متن کاملField Emission in Rf Cavities
Electron field emission limits the accelerating gradient in superconducting cavities. The present paper shows how and why it is an important problem. The phenomenology of field emission is then described, both in DC and RF regimes. In a third part, the merits of a few plausible “remedies” to field emission are discussed. 1 . WHY IS IT A PROBLEM ? When exposed to an intense, properly oriented el...
متن کاملStudies of Breakdown in a Pressurized RF Cavity
Microscopic images of the surfaces of metallic electrodes used in high-pressure gas-filled 805 MHz RF cavity experiments [1] have been used to investigate the mechanism of RF breakdown [2]. The images show evidence for melting and boiling in small regions of ~10 micron diameter on tungsten, molybdenum, and beryllium electrode surfaces. In these experiments, the dense hydrogen gas in the cavity ...
متن کاملSuperconducting RF Cavities: Past, Present and Future
In the last two decades many laboratories around the world, notably Argonne (ANL), TJNAF (formerly CEBAF), CERN, DESY and KEK, undertook the development of the technology of superconducting (SC) accelerating cavities. The aim was either to increase the accelerator energy or to save electrical consumption or both. This technology has been used extensively in the operating machines showing good p...
متن کاملLarge-grain Superconducting Rf Cavities at Desy
The DESY R&D program on cavities fabricated from large-grain niobium explores the potential of this material for the production of approximately 1000 nine-cell cavities for the European XFEL. The program investigates both basic material properties, comparing large grain material to standard sheet niobium, and material availability, production, and preparation aspects. Several single-cell caviti...
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ژورنال
عنوان ژورنال: Physical Review Accelerators and Beams
سال: 2016
ISSN: 2469-9888
DOI: 10.1103/physrevaccelbeams.19.062004