Optimized block-coil dipoles for future hadron colliders

Construction of block-coil high-field model dipoles for future hadron colliders

“…The additional copper needed in the outer windings (where B is least and j c (SC) is greatest) is provided by cabling copper strands along with the composite (Nb 3 Sn and copper) SC strands [5], or by cabling the composite SC strands around a copper/stainless steel core, thereby minimizing the volume of composite strand.…”

Very large hadron collider R&D

“…The first class is A15-compound low temperature superconductors: Nb 3 Sn and Nb 3 Al. These conductors would be operated at 4.5 o K. The second class includes copper-oxide high temperature superconductors (HTS), such as BSCCO-2212, BSCCO-2223, and YBCO-123 [18]; these conductors could be operated from 4.5 o K to [20][21][22][23][24][25][26][27][28][29][30] o K, with some reduction in critical current at the higher temperatures.…”

“…They plan to use the magnet as a test vehicle for BSCCO at [20][21][22][23][24][25][26][27][28][29][30] o K, and eventually YBCO. It will be a 1m long, 4-cm bore hybrid magnet, with NbTi background field coils and HTS (or Nb 3 Sn) inserts.…”

The Tevatron Tripler - magnet design and lattice issues

“…The block-coil structure incorporates stress management [9], in which a support matrix of Inconel and titanium ribs and plates is integrated into the coil so that Lorentz stress is intercepted midway through the coil and bypassed. In this way the peak stress in the coil should never exceed 100 MPa, and the magnets should be robust against training.…”

“…The dipole also uses conductor optimization [9] in which the cables of the outer windings are wound from a combination of superconducting strands (60%Nb 3 Sn, 40% Cu) and pure Cu strands. In this way we provide the copper necessary for quench protection without the expense of drawing it into the superconducting strands.…”