CERN Accelerating science

Published Articles
Title	Superconducting beam charge monitors for antiproton storage rings
Author(s)	Tympel, Volker (Jena U.) ; Neubert, Ralf (Jena U.) ; Seidel, Paul (Jena U.) ; Geithner, René (Jena U. ; Helmholtz Inst., Jena) ; Golm, Jessica (Jena U. ; Helmholtz Inst., Jena) ; Stöhlker, Thomas (Jena U. ; Helmholtz Inst., Jena ; Darmstadt, GSI) ; Kurian, Febian (Jena U. ; Helmholtz Inst., Jena ; Darmstadt, GSI) ; Sieber, Thomas (Darmstadt, GSI) ; Schwickert, Marcus (Darmstadt, GSI) ; Fernandes, Miguel (Cockcroft Inst. Accel. Sci. Tech. ; Liverpool U. ; CERN)
Publication	2017
Number of pages	6
In:	JPS Conf. Proc. 18 (2017) 011042
In:	12th International Conference on Low Energy Antiproton Physics, Kanazawa, Japan, 6 - 11 Mar 2016, pp.011042
DOI	10.7566/JPSCP.18.011042
Subject category	Accelerators and Storage Rings
Abstract	A Cryogenic Current Comparator (CCC) is a new type of instruments for monitoring charged beams like ions or antiprotons. Using superconducting effects is it possible to create a nondestructive, contactless and easy to calibrate beam measurement system with a high current resolution in amplitude and time. The Meissner effect enables an effective magnetic shielding of the system. The screening current enables creation of DC-transformers and therefore a DC-current measurement system. The combination of two Josephson-junctions and coils form a superconducting quantum interference device (SQUID) in an analog magnetic feedback of the flux-locked loop (FLL), which is linearizing the SQUID’s transfer function. The performance of the CCC system opens beam currents range between 1 nA and 20 µA. Installations at the Antiproton Decelerator at CERN and GSI in Darmstadt shows a strong correlation between SEM/longitudinal-Schottky and CCC signals including the known spill pattern but with a better signal to noise ratio.
Copyright/License	©2017 The Author(s) (License: CC-BY-4.0)

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