1109962 SzGeCERN 20220817153735.0 oai:cds.cern.ch:1109962 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN SPIRES 7807902 Inspire 775018 CERN-AT-2007-037-MEL eng CERN Library AT-2007-037 Ballarino, A CERN Extending the Application of HTS in Particle Accelerators 2008 Geneva CERN 20 Dec 2007 7 p The year-to-year improvements in the characteristics of high temperature superconductor (HTS) materials encourage periodic reappraisal of their applicability for use in accelerators. With the successful large-scale application of HTS technology for the current leads of the Large Hadron Collider at CERN, this tendency is accentuated, and the new materials are now starting to receive more serious attention as candidates for other accelerator-related applications. The medium- to long-term goal will be to use the materials for magnets, but their characteristics are totally different from those of classical multi-filamentary Nb-Ti material and the transition will be difficult. In particular it seems likely to be inappropriate to carry over the presently conventional coil geometries and conductor excitation levels. A roadmap is proposed for R&D that will lead progressively to achieving the ultimate goal through consolidation of the necessary technology via intermediate steps, and progressive accumulation of successful applications. CC-BY publication CERN EDS OA CERN-AT UNCL SzGeCERN Accelerators and Storage Rings CERN ARTICLE Meß, K H CERN Taylor, T CERN AT 012288 J. Phys.: Conf. Ser. 97 2008 http://cds.cern.ch/record/1109962/files/CERN-AT-2007-037.pdf Preprint evelyne.delucinge@cern.ch n 200825 a2008 13 20100901 1605 CER01 20080616 1092138 012288 brussels20070916 PUBLIC 000700288CER ARTICLE ConferencePaper 1122754 SzGeCERN 20220817153647.0 oai:cds.cern.ch:1122754 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN SPIRES 8022755 Inspire 775471 CERN-AT-2007-040-MCS eng CERN Library AT-2007-040 Willering, G P CERN Twente U. Current Redistribution around the Superconducting-to-normal Transition in Superconducting Nb-Ti Rutherford Cables 2008 Geneva CERN 20 Dec 2007 8 p Sufficient thermal-electromagnetic stability against external heat sources is an essential design criterion for superconducting Rutherford cables, especially if operated close to the critical current. Due to the complex phenomena contributing to stability such as helium cooling, inter-strand current and heat transfer, its level is difficult to quantify. In order to improve our understanding, many stability tests were performed on different cable samples, each incorporating several point-like heaters. The current redistribution around the heat front is measured after inducing a local normal zone in one strand of the cable. By using voltage taps, expansion of the normal zone is monitored in the initially quenched strand as well as in adjacent strands. An array of Hall probes positioned at the cable edge is used to scan the selffield generated by the cable by which it becomes possible to estimate the inter-strand current transfer. In this paper it is demonstrated that two different stability regimes can be distinguished depending on the local conditions for local normal zone recovery through heat and current transfer to adjacent strands. It is shown that in the first regime every normal zone will lead to a quench, while in the second regime a normal zone in one strand can recover. Combining the predictions developed using a novel version of the numerical network model CUDI and new measurement results, it is possible to derive char acteristic quench decision times as well to calculate and predict the influence of a change in cable parameters. CC-BY publication CERN EDS OA CERN-AT CLAS1 SzGeCERN Accelerators and Storage Rings CERN ARTICLE XX XX Verweij, A CERN ten Kate, H H J CERN Twente U. AT 012119 J. Phys.: Conf. Ser. 97 2008 http://cds.cern.ch/record/1122754/files/CERN-AT-2007-040.pdf Fulltext evelyne.delucinge@cern.ch n 200835 a2008 13 20100901 1605 CER01 20080828 1092138 012119 brussels20070916 PUBLIC 000700485CER ARTICLE ConferencePaper 1121990 SzGeCERN 20220817153712.0 oai:cds.cern.ch:1121990 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN SPIRES 8022763 Inspire 775472 CERN-AT-2007-039-MCS eng CERN Library AT-2007-039 Boutboul, T CERN Nb$_{3}$Sn Conductor Development and Characterization for NED 2008 Geneva CERN 20 Dec 2008 10 p Supported in part by the European Community-Research Infrastructure Activity under the FP6 "Structuring the European Research Area" program (CARE, contract number RII3-CT-2003-506395) Collaboration The main purpose of Next European Dipole (NED) project is to design and to build an Nb$_{3}$Sn ~ 15 T dipole magnet. Due to budget constraints, NED is mainly focused on superconducting cable development and production. In this work, an update is given on the NED conductor development by Alstom-MSA and SMI, which uses, respectively, Internal-Tin-Diffusion and Powder-In-Tube methods, with the aim of reaching a non-copper critical current density of ~ 3000 A/mm2 at 12 T and 4.2 K. Characterization results, including critical current and magnetization data, are presented and discussed, as well, for conductors already developed by both companies for this project. SMI succeeded to produce a strand with 50 µm diameter filaments and with a critical current of ~ 1400 A at 4.2 K and 12 T, corresponding to a non-copper critical current density of ~ 2500 A/mm2. Cabling trials with this strand were successfully carried out at LBNL. CC-BY publication CERN EDS OA CERN-AT CLAS1 SzGeCERN Accelerators and Storage Rings CERN ARTICLE XX XX den Ouden, A Twente U. Devred, A CERN CEA Fabbricatore, P INFN, Genoa Greco, M INFN, Genoa Leroy, D CERN Oberli, L CERN Pedrini, D INFN-Milan/LASA Volpini, G INFN-Milan/LASA AT 012211 J. Phys.: Conf. Ser. 97 2008 http://cds.cern.ch/record/1121990/files/CERN-AT-2007-039.pdf Fulltext evelyne.delucinge@cern.ch n 200835 a2008 13 20100901 1605 CER01 20080826 1092138 012211 brussels20070916 PUBLIC 000700452CER ARTICLE ConferencePaper 1109978 SzGeCERN 20220817153737.0 oai:cds.cern.ch:1109978 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN SPIRES 7807880 Inspire 775017 CERN-AT-2007-038-MEL eng CERN Library AT-2007-038 March, S A CERN Southampton U. Towards the Design of Power Switches Utilizing HTS Material 2008 Geneva CERN 20 Dec 2007 7 p Conventional superconducting switches for power applications, which operate at liquid helium temperature, generally utilize Nb-Ti superconductor in a cupro-nickel matrix. For superconducting circuits based on High Temperature Superconductors (HTS) that work at higher temperatures, the associated superconducting switches must also be based on HTS. This paper addresses the issues concerning the requirements and the appropriate design of HTS switches, including approaches to fast triggering. CC-BY publication CERN EDS OA CERN-AT UNCL SzGeCERN Accelerators and Storage Rings CERN ARTICLE Ballarino, A CERN Beduz, C Southampton U. Mess, K H CERN Yang, Y Southampton U. AT 012002 J. Phys.: Conf. Ser. 97 2008 http://cds.cern.ch/record/1109978/files/CERN-AT-2007-038.pdf Preprint evelyne.delucinge@cern.ch n 200825 a2008 13 20100901 1605 CER01 20080616 1092138 012002 brussels20070916 PUBLIC 000700290CER ARTICLE ConferencePaper