Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9845380 | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | 2005 | 14 Pages |
Abstract
The paper reports on the field mapping measurements which were conducted to determine the bending integral under a range of excitation currents and coil temperatures. These were made in the laboratory before and after spectrometer operation, using a test-bench equipped with a moving arm, carrying an NMR probe and Hall probes, and in the LEP tunnel itself, with a mapping trolley inside the vacuum chamber. The mapping data are related to local readings supplied by fixed NMR probes in the dipole, and a predictive model developed which shows good consistency for all datasets within the estimated uncertainty, which is 14Ã10-5 for the moving arm, and 3Ã10-5 for the mapping trolley. Measurements are also presented of the field gradient inside the dipole, and of the environmental magnetic fields in the LEP tunnel. When applied to the spectrometer energy calibrations, the bending field model calculates the ratio of integrated fields with an estimated uncertainty of 1.5Ã10-5.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Instrumentation
Authors
R. Chritin, D. Cornuet, B. Dehning, A. Hidalgo, M. Hildreth, W. Kalbreier, P. Leclère, G. Mugnai, J. Palacios, F. Roncarolo, E. Torrence, G. Wilkinson,