Electron Beam Excitation of a Surface Wave in mm-Wave Open Accelerating Structures
| Autor: | Dal Forno, Massimo, Bowden, Gordon, Clarke, Christine, Dolgashev, Valery, Hogan, Mark, McCormick, Douglas, Novokhatski, Alexander, O'Shea, Brendan, Spataro, Bruno, Tantawi, Sami, Weathersby, Stephen |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: | |
| DOI: | 10.18429/jacow-ipac2016-mopmw040 |
| Popis: | As part of research on the physics of rf breakdowns we performed experiments with high gradient traveling-wave mm-wave accelerating structures. The accelerating structures are open, composed of two identical halves separated by an adjustable gap. The electromagnetic fields are excited by an ultra-relativistic electron beam. We observed that a confined travelling-wave mode exists in half of the accelerating structure. The experiments were conducted at FACET facility at SLAC National Accelerator Laboratory. Depending on the gap width, the accelerating structure had beam-synchronous frequencies that vary from 90 to 140 GHz. When we opened the gap by more than half wavelength the synchronous wave remains trapped. Its behavior is consistent with the so called "surface wave". We characterized this beam-wave interaction by several methods: measurement of the radiated rf energy with the pyro-detector, measurement of the spectrum with an interferometer, measurement of the beam deflection by using the beam position monitors and profile monitor. Proceedings of the 7th Int. Particle Accelerator Conf., IPAC2016, Busan, Korea |
| Databáze: | OpenAIRE |
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