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arXiv:1110.0306 (physics)
[Submitted on 3 Oct 2011]

Title:Measurement of the CMS Magnetic Field

Authors:V. I. Klyukhin, A. Ball, F. Bergsma, D. Campi, B. Curé, A. Gaddi, H. Gerwig, A. Hervé, J. Korienek, F. Linde, C. Lindenmeyer, R. Loveless, M. Mulders, T. Nebel, R. P. Smith, D. Stickland, G. Teafoe, L. Veillet, J. K. Zimmerman
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Abstract:The measurement of the magnetic field in the tracking volume inside the superconducting coil of the Compact Muon Solenoid (CMS) detector under construction at CERN is done with a fieldmapper designed and produced at Fermilab. The fieldmapper uses 10 3-D B-sensors (Hall probes) developed at NIKHEF and calibrated at CERN to precision 0.05% for a nominal 4 T field. The precise fieldmapper measurements are done in 33840 points inside a cylinder of 1.724 m radius and 7 m long at central fields of 2, 3, 3.5, 3.8, and 4 T. Three components of the magnetic flux density at the CMS coil maximum excitation and the remanent fields on the steel-air interface after discharge of the coil are measured in check-points with 95 3-D B-sensors located near the magnetic flux return yoke elements. Voltages induced in 22 flux-loops made of 405-turn installed on selected segments of the yoke are sampled online during the entire fast discharge (190 s time-constant) of the CMS coil and integrated offline to provide a measurement of the initial magnetic flux density in steel at the maximum field to an accuracy of a few percent. The results of the measurements made at 4 T are reported and compared with a three-dimensional model of the CMS magnet system calculated with TOSCA.
Comments: 4 pages, 5 figures, 15 references
Subjects: Instrumentation and Detectors (physics.ins-det); High Energy Physics - Experiment (hep-ex)
Cite as: arXiv:1110.0306 [physics.ins-det]
  (or arXiv:1110.0306v1 [physics.ins-det] for this version)
  https://doi.org/10.48550/arXiv.1110.0306
Journal reference: IEEE Trans on Appl. Superconduct., vol. 18, no. 2, pp. 295-298, June 2008
Related DOI: https://doi.org/10.1109/TASC.2008.921242

Submission history

From: Vyacheslav Klyukhin [view email]
[v1] Mon, 3 Oct 2011 09:20:20 UTC (576 KB)
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