CERN Accelerating science

ATLAS Note
Report number	ATL-MAGNET-PUB-2007-001 ; ATL-COM-MAGNET-2007-002
Title	Measurement of the solenoid magnetic field
Author(s)	Aleksa, M ; Bergsma, F ; Giudici, P-A ; Kehrli, A ; Losasso, M ; Pons, X ; Sandaker, H ; Miyagawa, PS ; Snow, SW ; Hart, JC ; Chevalier, L
Publication	2007
Imprint	04 Sep 2007
Number of pages	35
Series	(Magnets)
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	magnet solenoid field map
Abstract	We describe the machine used to map the solenoid field and the data sets that were collected. The bulk of the note describes the analysis of this data. A series of small corrections are made; some taken from surveys and some derived from the data itself. Two fitting methods are defined and applied to all data sets. The final result is that the field map at normal operating current can be fitted to a function that obeys Maxwell with an r.m.s. residual of less than 5 Gauss. Systematic errors on the measurement of track sagitta due to the field uncertainty are estimated to be in the range 2.3E-4 to 12E-4, depending on the track rapidity. Finally, the representation of the map in Athena is briefly described.
Copyright/License	Preprint: (License: CC-BY-4.0)

Corresponding record in: Inspire