CERN Accelerating science

Published Articles
Title	Design and optimisation of low heat load liquid helium cryostat to house cryogenic current comparator in antiproton decelerator at CERN
Author(s)	Lees, A (CERN) ; Koettig, T (CERN) ; Fernandes, M (CERN) ; Tan, J (CERN)
Publication	2017
In:	IOP Conf. Ser. Mater. Sci. Eng. 171 (2017) 012033
In:	26th International Cryogenic Engineering Conference and International Cryogenic Materials Conference 2016, New Delhi, India, 7 - 11 Mar 2016, pp.012033
DOI	10.1088/1757-899X/171/1/012033
Subject category	Accelerators and Storage Rings
Abstract	The Cryogenic Current Comparator (CCC) is installed in the low-energy Antiproton Decelerator (AD) at CERN to make an absolute measurement of the beam intensity. Operating below 4.2 K, it is based on a superconducting quantum interference device (SQUID) and employs a superconducting niobium shield to supress magnetic field components not linked to the beam current. The AD contains no permanent cryogenic infrastructure so the local continuous liquefaction of helium using a pulse-tube is required; limiting the available cooling power to 0.69 W at 4.2K. Due to the sensitivity of the SQUID to variations in magnetic fields, the CCC is highly sensitive to mechanical vibration which is limited to a minimum by the support systems of the cryostat. This article presents the cooling system of the cryostat and discusses the design challenges overcome to minimise the transmission of vibration to the CCC while operating within the cryogenic limits imposed by the cooling system.
Copyright/License	publication: (License: CC-BY-3.0)

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