Title: Test and Analysis of 4 Technology Quadrupole Shell (TQS) models for LARP
Abstract: 3E05 Test and Analysis of 4 Technology Quadrupole Shell (TQS) models for LARP S. Caspi, G. Ambrosio, A.N. Andreev, E. Barzi, R. Bossert, D. R. Dietderich, H. Felice, P. Ferracin, A. Ghosh, A. R. Hafalia, A. F. Lietzke, I. Novitski, G.L. Sabbi, and A.V. Zlobin Abstract—Test results are reported on TQS02a, a second model in support of the development of a large-aperture Nb 3 Sn superconducting quadrupole for the US LHC Accelerator Research Program (LARP). The magnet uses key and bladder technology with supporting iron yoke and an aluminum shell. Changes from the previous first model (tested in 2006) include:1) Titanium island poles 2) no axial island gaps during reaction and 3) RRP Nb 3 Sn conductor. Design changes resulted from previous tests with three different magnet assemblies (TQS01a, TQS01b and TQS01c) using coils with bronze segmented islands, with gaps and MJR conductor The paper summarizes the assembly, cool-down and performance of TQS01a, TQS01b, TQS01c, and TQS02 and compares measurements with design expectations Index Terms— LARP, Nb 3 Sn, Superconducting Quadrupole Magnet, TQS. parallel path of two different structures to test virtually identical coils. The LBNL approach (TQS) [6]-[9] is to use a shell-based structure with “keys and bladders” assembly (see Fig. 1 and Fig. 2), while the FNAL approach (TQC) [10], [11] is to use a collar-based structure, applying a modified NbTi assembly procedure, to the assembly of Nb 3 Sn coils. I. INTRODUCTION H E Technology Quadrupole (TQ) magnet series, under development by the U.S.-LHC Accelerator Research Program (LARP), is a close partnership between magnet physicists and engineers from BNL, FNAL and LBNL [1]. The program long term goal is to demonstrate, by the year 2009, that Nb 3 Sn magnets are a viable choice for an LHC IR upgrade [2]. A successful test will have to demonstrate a 3.6 m long magnet with a 90 mm bore and a gradient above 200 T/m. Over the past three years several steps in that direction were taken. A Subscale Quadrupole magnet program (SQ) [3] was lunched to study small Nb 3 Sn racetrack coils, a Technology Quadrupole (TQ) program extended the SQ technology to 1 m long cos-theta coils and the Long Racetrack program (LR) [4] extended the same technology to 3.6 m long coils. The Long Racetrack program had recently successfully tested a magnet (LRS01) using two Nb 3 Sn racetrack coils assembled as “common coils” within a shell structure pre- stressed using “keys and bladders” technology [5]. At the present time the LARP TQ program is using a Manuscript received August 28, 2007. This work was supported by the Director, Office of Energy Research, Office of High Energy and Nuclear Physics, High Energy Physics Division, U. S. Department of Energy, under Contract No. DE-AC02-05CH11231 S. Caspi, D.R. Dietderich, P. Ferracin, A.R. Hafalia, A.F. Lietzke and G.L. Sabbi are with Lawrence Berkeley National Laboratory, Berkeley, CA 94720 USA (phone: 510-486-7244; fax: 510-486-5310; e-mail: [email protected]). G. Ambrosio, A.N. Andreev, E. Barzi, R. Bossert, I. Novitski and A.V. Zlobin, are with Fermi National Laboratory, Batavia, IL 60510-0500 USA. A. Ghosh is with Brookhaven National Laboratory, Upton, NY 11973- 5000 USA. T Fig.1. An assembled TQS magnet ready for testing. Showings are the outer aluminum shell, end-plate, and four axial rods. This paper focuses on the recent test results of magnet TQS02a. It also summarizes and compares test results of 4 different TQS assemblies in an attempt to address technological issues and provide guidance to future tests.
Publication Year: 2008
Publication Date: 2008-11-19
Language: en
Type: article
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