| Article | |
| Report number | arXiv:1110.0306 |
| Title | Measurement of the CMS Magnetic Field |
| Author(s) | Klyukhin, V.I. (SINP, Moscow ; CERN) ; Ball, A. (CERN) ; Bergsma, F. (CERN) ; Campi, D. (CERN) ; Cure, B. (CERN) ; Gaddi, A. (CERN) ; Gerwig, H. (CERN) ; Herve, A. (CERN) ; Korienek, J. (Fermilab) ; Linde, F. (NIKHEF, Amsterdam) ; Lindenmeyer, C. (Fermilab) ; Loveless, R. (Wisconsin U., Madison) ; Mulders, M. (CERN) ; Nebel, T. (Fermilab) ; Smith, R.P. (Fermilab) ; Stickland, D. (Princeton U.) ; Teafoe, G. (Fermilab) ; Veillet, L. (CERN) ; Zimmerman, J.K. (Fermilab) |
| Publication | 2008-06-06 |
| Imprint | 04 Oct 2011 |
| Number of pages | 4 |
| Note | 4 pages, 5 figures, 15 references |
| In: | IEEE Trans. Appl. Supercond. 18 (2008) 395-398 |
| In: | 20th International Conference on Magnet Technology, Philadelphia, PA, USA, 27 - 31 Aug 2007, pp.395-398 |
| DOI | 10.1109/TASC.2008.921242 |
| Subject category | Detectors and Experimental Techniques ; Detectors and Experimental Techniques |
| Accelerator/Facility, Experiment | CERN LHC ; CMS |
| 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. |
| Copyright/License | publication: © 2008-2024 IEEE |
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