CERN Accelerating science

Published Articles
Report number	CERN-ACC-2015-0115
Title	Design and first measurements of an alternative calorimetry chamber for the HZB quadrupole resonator
Author(s)	Keckert, Sebastian (Helmholtz-Zentrum, Berlin) ; Kleindienst, Raphael (Helmholtz-Zentrum, Berlin) ; Knobloch, Jens (Helmholtz-Zentrum, Berlin) ; Kugeler, Oliver (Helmholtz-Zentrum, Berlin)
Publication	2015
Imprint	2015-09-13
In:	17th International Conference on RF Superconductivity, Whistler, Canada, 13 - 18 Sep 2015, pp.TUPB067
DOI	10.18429/JACoW-SRF2015-TUPB067
Subject category	Accelerators and Storage Rings ; 12: Innovative Radio Frequency Technologies (RF) ; 12.2: Thin films
Abstract	The systematic research on superconducting thin films requires dedicated testing equipment. The Quadrupole Resonator (QPR) is a specialized tool to characterize the superconducting RF properties of circular planar samples. A calorimetric measurement of the RF surface losses allows the surface resistance to be measured with sub nano-ohm resolution. This measurement can be performed over a wide temperature and magnetic field range, at frequencies of 433, 866 and 1300 MHz. The system at Helmholtz-Zentrum Berlin (HZB) is based on a resonator built at CERN and has been optimized to lower peak electric fields and an improved resolution. In this paper the design of an alternative calorimetry chamber is presented, providing flat samples for coating which are easy changeable. All parts are connected by screwing connections and no electron beam welding is required. Furthermore this design enables exchangeability of samples between the resonators at HZB and CERN. First measurements with the new design show ambiguous results, partly explainable by RF losses at the indium gasket.

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