CERN Accelerating science

Article
Report number	LHC-Project-Report-365 ; CERN-LHC-Project-Report-365
Title	The CERN Cryogenic Test Facility for the Atlas Barrel Toroid Magnets
Edition	1999 ed.
Author(s)	Haug, F ; Cambon, A ; Delruelle, N ; Orlic, J P ; Passardi, Giorgio ; Tischhauser, Johann
Affiliation	(CERN)
Publication	1999
Imprint	1 Dec 1999
Number of pages	5
In:	16th International Conference on Magnet Technology, Tallahassee, FL, USA, 26 Sep - 2 Oct 1999, pp.1514-1517
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Abstract	The superconducting magnet system of the ATLAS detector will consist of a central solenoid, two end-cap toroidal magnets (ECT) and the barrel toroid magnet (BT) made of eight coils symmetrically placed around the central axis of the detector. The magnets will be tested individually in a 5000 m2 experimental area prior to their final installation at an underground cavern of the LHC Collider. For the BT magnets, a dedicated cryogenic test facility has been designed which is currently under the construction and commissioning phase. A liquid nitrogen pre-cooling unit and a 1200 [email protected] refrigerator will allow flexible operating conditions via a rather complex distribution and transfer line system. Flow of two-phase helium for cooling the coils is provided by centrifugal pumps immersed in a saturated liquid helium bath. The integration of the pumps in an existing cryostat required the adoption of novel mechanical solutions. Tests conducted permitted the validation of the technical design of the cryostat and its instrumentation. The characteristics of one pump were measured and pressure rise of 300 mbar at nominal flow of 80 g/s confirmed the specifications.

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