NDLI: Measuring the magnetic field inside the CMS steel yoke elements

Content Provider	IEEE Xplore Digital Library
Author	Klyukhin, V. I. Ball, A. Campi, D. Cure, B. Dattola, D. Gaddi, A. Gerwig, H. Herve, A. Loveless, R. Reithler, H. Smith, R. P.
Copyright Year	2008
Description	Author affiliation: CERN, CH-1211, Geneva 23, Switzerland (Ball, A.; Campi, D.; Cure, B.; Gaddi, A.; Gerwig, H.; Herve, A.) \|\| RWTH, III. Physikalisches Institut A, Aachen, Germany (Reithler, H.) \|\| Skobeltsyn Institute of Nuclear Physics, Moscow State University, RU-119992, Russia (Klyukhin, V. I.) \|\| Università di Torino e Sezione dell¿ INFN, Italy (Dattola, D.) \|\| Department of Physics, University of Wisconsin, Madison, 53706, USA (Loveless, R.)
Abstract	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 long free bore, enclosed inside a 10000-ton return yoke made of construction steel. The 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. Accurate characterization of the magnetic field everywhere in the CMS detector is required. To measure the field in and around the steel a system of 22 flux-loops and 82 3-D Hall probe B-sensors is installed on the return yoke blocks. Fast discharges of the solenoid (190 s time-constant) made during the CMS magnet surface commissioning test at the solenoid central fields of 2.64, 3.16, 3.69 and 4.01 T were used to induce voltages in the flux-loops. The voltages are measured on-line and integrated off-line to obtain the magnetic flux in the steel yoke close to the muon chambers at full excitations of the solenoid. The Hall probe B-sensors installed on the steel-air interfaces give supplementary information on the components of magnetic field and permit to estimate the remanent field in steel to be added to the magnetic flux density obtained by the voltages integration. A TOSCA 3-D model of the CMS magnet is developed to describe the magnetic field everywhere outside the tracking volume measured with the field-mapping machine. The results of the measurements and calculations are presented, compared and discussed.
Starting Page	2270
Ending Page	2273
File Size	2859555
Page Count	4
File Format	PDF
ISBN	9781424427147
ISSN	10957863
DOI	10.1109/NSSMIC.2008.4774806
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-10-19
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic field measurement Collision mitigation Steel Solenoids Mesons Superconducting magnets Magnetic flux Voltage Detectors Large Hadron Collider
Content Type	Text
Resource Type	Article

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Developing the technique of measurements of magnetic field in the CMS steel yoke elements with flux-loops and Hall probes

The CMS Muon detectors

Analysis of eddy current distributions in the CMS magnet yoke during the solenoid discharge

Measuring the magnetic field in the CMS steel yoke elements

The CMS central tracker

Developing the technique of measurements of magnetic field in the CMS steel yoke elements with flux-loops and Hall probes

The CMS Magnetic Field Map Performance

Magnetic Tests of the CMS Superconducting Magnet

Experience Gained From the Construction, Test and Operation of the Large 4-T CMS Coil

Measuring the magnetic field inside the CMS steel yoke elements

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