Measuring the magnetic flux density with the flux loops and hall probes in the CMS magnet flux return yokeстатья

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1. Полный текст PDF file B_Cure_TAS_NSSMIC16_abt_id1971_20161118.pdf 279,3 КБ 12 декабря 2017 [klyukhin]

[1] Measuring the magnetic flux density with the flux loops and hall probes in the cms magnet flux return yoke / B. Curé, N. Amapane, A. Ball et al. // 2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD). — IEEE, 2016. — P. 1–4. The Compact Muon Solenoid (CMS) is a general purpose detector, designed to run at the highest luminosity at the CERN Large Hadron Collider (LHC). Its distinctive features include a 4 T superconducting solenoid with 6-m-diameter by 12.5-m-length free bore, enclosed inside a 10,000-ton return yoke made of construction steel. The flux return yoke consists of five dodecagonal three-layered barrel wheels and four end-cap disks at each end comprised of steel blocks up to 620 mm thick, which serve as the absorber plates of the muon detection system. To measure the field in and around the steel, a system of 22 flux loops and 82 3-D Hall sensors is installed on the return yoke blocks. A TOSCA 3-D model of the CMS magnet is developed to describe the magnetic field everywhere outside the tracking volume that was measured with the field-mapping machine. The voltages induced in the flux loops by the magnetic flux changing during the CMS magnet standard ramps up and down are measured with six 16-bit DAQ modules. The off-line integration of the induced voltages reconstructs the magnetic flux density in the yoke steel blocks at the operational magnet current of 18.164 kA. The results of the flux loop measurements during the magnet ramps up and down are presented and discussed. [ DOI ]

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