CERN Accelerating science

EuCARD Conference Paper
Report number	EuCARD-CON-2011-072
Date(s), location
Imprint	2011
Title	Diode Down-mixing of HOM Coupler Signals for Beam Position Determination in 1.3-GHz- and 3.9-GHz-Cavities at FLASH
Author(s)	Glock, H W (U. Rostock) ; Ecklebe, H (U. Rostock) ; Flisgen, T (U. Rostock) ; Baboi, N (DESY) ; Zhang, P (Manchester U. ; DESY ; Cockcroft Inst. Accel. Sci. Tech.)
WP	10: SC RF technology for higher intensity proton accelerators and higher energy electron linacs
Task	10.5: HOM Distribution
Abstract	Beam excited signals available at the HOM coupler ports of superconducting accelerating cavities cover a wide frequency range and carry information about (amongst others) the transverse beam position. Down-mixing these signals using detector diodes is a mean to measure the time dependence of the power leaving the HOM coupler with standard and non-specific oscilloscope technology. Experiments undertaken at the accelerator modules ACC1 and ACC39 at FLASH demonstrated the possibility to extract beam position data out of low frequency signals sampled with such a setup. These experiments as part of an ongoing study are described together with mathematical details of the evaluation scheme.
Published in	Conf. Proc. C11-05-16.4 (2011) pp.MOPD25
Presented at	10th European Workshop on Beam Diagnostics and Instrumentation for Particle Accelerators, Hamburg, Germany, 16 - 18 May 2011, pp.101-103

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