Title: Development and Test of LARP Technological Quadrupole (TQC) Magnet
Abstract: 4LX04 Development and Test of LARP Technological Quadrupole (TQC) Magnet S. Feher, R.C. Bossert, G. Ambrosio, N. Andreev, E. Barzi, R. Carcagno, V.S. Kashikhin, V.V. Kashikhin, M.J. Lamm, F. Nobrega, I. Novitski, Yu. Pischalnikov, C. Sylvester, M. Tartaglia, D. Turrioni, G. Whitson, R. Yamada, A.V. Zlobin, S. Caspi, D. Dietderich, P. Ferracin, R. Hannaford, A.R. Hafalia, G. Sabbi structural design and 2D analysis have been previously discussed [3]. B. Instrumentation TQC01 is instrumented with strain gauges at various locations to measure preloads and stresses within structural components during assembly and testing. Coil instrumentation included azimuthal gauges on the inner coil and axial gauges on the inner surface of the bronze pole pieces, both in the straight section and at the pole on the lead end. Control spacers, skins and end preload bolts (bullets) were also instrumented. Shims were placed at specified locations to provide coil design preload. Fig. 1 shows the TQ structure with the main structural components labeled, and the positions of strain gauges and shims noted. Fig. 2 shows the lead end of a coil with positions of strain gauges shown. Coil Azimuthal Gauges Abstract—In support of the development of a large-aperture Nb 3 Sn superconducting quadrupole for the Large Hadron Collider (LHC) luminosity upgrade, two-layer quadrupole models (TQC and TQS) with 90 mm aperture are being constructed at Fermilab and LBNL within the framework of the US LHC Accelerator Research Program (LARP). This paper describes the construction and test of model TQC01. ANSYS calculations of the structure are compared with measurements during construction. Fabrication experience is described and in- process measurements are reported. Test results at 4.5 K are presented, including magnet training, current ramp rate studies and magnet quench current. Results of magnetic measurements at helium temperature are also presented. Index Terms—LARP, LHC, IR, Nb3Sn, quadrupole magnet, collars, yoke, skin. O I. I NTRODUCTION of the primary objectives of the US LHC Accelerator Research Program is to develop Nb 3 Sn quadrupole technology for a future LHC upgrade [1]. Technology quadrupole models using two different structures [2][3], each with identical coils, are being constructed in collaboration between Lawrence Berkeley Lab (LBNL) and Fermilab (FNAL). The TQC01 structure, developed and built at Fermilab, consists of stainless steel collars surrounding the coils supported by an iron yoke and stainless steel skin [3]. NE Bronze outer pole piece Inner bronze pole piece with stress relief slot Collar- Yoke Preload Shim Collaring Key Collar Gauges on Control Spacers Skin Yoke Gap Yoke Control Spacer Skin Gauge Coil Midplane Shim II. M AGNET D ESIGN AND A NALYSIS A. Magnet Design The TQ coils (common to TQC and TQS) are manufactured using a 2-layer cos-2θ configuration with a 90 mm bore and one wedge per octant in the inner layer. TQC coil and Manuscript received August 29, 2006. This work was supported the U.S. Department of Energy. S. Feher, R.C. Bossert, G. Ambrosio, N. Andreev, E. Barzi, R. Carcagno, V.S.Kashikhin, V.V. Kashikhin, M.J. Lamm, F. Nobrega, I. Novitski, Yu. Pishalnikov, C. Sylvester, M. Tartaglia, D. Turrione, R. Yamada and A. Zlobin are with Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, Il. USA (corresponding author to provide phone: 630-840-2240, fax: 630-840-8079, e-mail: fehers@ fnal.gov). S. Caspi, D. Dietderich, P. Ferracin, R. Hafalia R. Hannaford and G. Sabbi are with :Lawrence Berkeley National Laboratory, Berkeley, CA 92740 USA. Fig. 1. TQ structure with positions of instrumentation. Azimuthal Guages Axial Guage Axial Guage Fig. 2. Inner surface of instrumented coil. C. Analysis 2D and 3D analysis for TQC01 has been completed [3] [4]. Table I shows expected stresses within the structure according to the 2D analysis. End load was chosen based on 3D
Publication Year: 2008
Publication Date: 2008-09-22
Language: en
Type: article
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