First Beam Spectra of SC Third Harmonic Cavity at FLASH

Details First Beam Spectra of SC Third Harmonic Cavity at FLASH First Beam Spectra of SC Third Harmonic Cavity at FLASH

2010-09-24

arxiv.org/abs/1009.4863v1

Physics

Accelerator Physics

Presented at XXV Linear Accelerator Conference (LINAC10), Tsukuba, Japan, Sep 12-17, 2010

Scientific paper

Third harmonic superconducting cavities have been designed and fabricated by FNAL to minimise the energy spread along bunches in the FLASH facility at DESY. A module, consisting of four nine-cell 3.9 GHz cavities, has been installed in FLASH. The first measurement with beam excitation is presented, and the comparisons to transmission measurement without beam and simulations are made. Higher order modes (HOMs) are able to propagate to adjacent cavities through attached beam tubes. Modes from 1.3 GHz cavities in the module nearby also propagate into this module.

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