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A NEW GENERATION NB 3 SN WIRE, AND THE PROSPECTS FOR ITS USE IN PARTICLE ACCELERATORS R.M.Scanlan 1 , D.R. Dietderich 1 , and S.A.Gourlay 1 Lawrence Berkeley National Laboratory Berkeley, CA, 94720, USA ABSTRACT The US DOE has initiated a Conductor Development Program aimed at demonstrating a high current density, cost effective Nb 3 Sn conductor for use in accelerator magnets. The first goal, an increase in current density by 50 %, has been achieved in a practical conductor. The program is focused at present on achieving the second goal of reduced losses. The different approaches for achieving these goals will be discussed, and the status will be presented. Magnet technology R&D has been proceeding in parallel with the conductor development efforts, and these two technologies are reaching the level required for the next step--introduction into operating accelerator magnets. An obvious point for introducing this technology is the LHC interaction region magnets, which require large apertures and high fields (or high field gradients). By upgrading the interaction region magnets, machine performance can be enhanced significantly without replacing the arc magnets, which represent most of the cost of an accelerator. Design requirements generated by recent studies and workshops will be reviewed, and a roadmap for the development of the next-generation interaction region magnets will be presented .. INTRODUCTION The Large Hadron Collider (LHC), under construction at CERN, will be the world's most powerful particle accelerator, with a luminosity of about 2 x 10 34 cm -1 s -1 , and a proton beam energy of 7 TeV. As construction of this phase is nearing completion, CERN has initiated a task force to study the feasibility of upgrades to the LHC [1]. Two possible upgrade scenarios for LHC are being evaluated--a luminosity upgrade and an energy upgrade. Both upgrades will require higher performance superconducting magnets, beyond the capability of the NbTi superconductor that was used in the LHC. Several luminosity upgrade options are being considered, with the most likely being a replacement

A New Generation Nb3Sn Wire, and the Prospects for Its Use in Particle Accelerators