NDLI: Reproducibility of the Coil Positioning in <formula formulatype=inline><tex Notation=TeX>${rm Nb}_{3}{rm Sn}$</tex></formula> Magnet Models Through Magnetic Measurements

Content Provider	IEEE Xplore Digital Library
Author	Borgnolutti, F. Caspi, S. Ferracin, P. Kashikhin, V.V. Sabbi, G. Velev, G. Todesco, E. Zlobin, A.V.
Copyright Year	2002
Abstract	The random part of the integral field harmonics in a series of superconducting magnets has been used in the past to identify the reproducibility of the coil positioning. Using a magnetic model and a Monte-Carlo approach, coil blocks are randomly moved and the amplitude that best fits the magnetic measurements is interpreted as the reproducibility of the coil position. Previous values for r.m.s. coil displacements for Nb-Ti magnets range from 0.05 to 0.01 mm. In this paper, we use this approach to estimate the reproducibility in the coil position for Nb₃Sn short models that have been built in the framework of the FNAL core program (HFDA dipoles) and of the LARP program (TQ quadrupoles). Our analysis shows that the Nb₃Sn models manufactured in the past years correspond to r.m.s. coil displacements of at least 5 times what is found for the series production of a mature Nb-Ti technology. On the other hand, the variability of the field harmonics along the magnet axis shows that Nb₃Sn magnets have already reached values similar to this obtained for Nb-Ti ones.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1100
Ending Page	1105
Page Count	6
File Size	453880
File Format	PDF
ISSN	10518223
Volume Number	19
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Reproducibility of results Tin Superconducting coils Niobium Superconducting magnets Magnetic variables measurement Magnetic cores Time series analysis Virtual manufacturing Production superconducting accelerator magnets Field quality
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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