On the Feasibility of a Tripler Upgrade for LHC

Abstract

The design of high-field dipoles has been optimized using a block coil geometry. The optimization includes stress management and flux plate suppression of multipoles from snapback. The design has been extended to higher field by devising a hybrid coil geometry containing inner windings of Bi-2212 and outer windings of Nb 3 Sn. A 24 Tesla dual dipole using this design offers the possibility of an LHC tripler. Issues of fabrication technology and synchrotron radiation control are discussed. There is no obvious upper limit to the field that could be attained for the dipoles of future hadron colliders. AbstractThe design of high-field dipoles has been optimized using a block coil geometry. The optimization includes stress management and flux plate suppression of multipoles from snap-back. The design has been extended to higher field by devising a hybrid coil geometry containing inner windings of Bi-2212 and outer windings of Nb 3 Sn. A 24 Tesla dual dipole using this design offers the possibility of an LHC tripler. Issues of fabrication technology and synchrotron radiation control are discussed. There is no obvious upper limit to the field that could be attained for the dipoles of future hadron colliders.

Fabrication of ‘TAMU3’, a ‘Wind/React’ stress-managed 14T Nb3Sn block coil design

“…The innovations embodied in TAMU3 should pave the way for developing dipoles up to much higher fields. A design has been proposed to extend the approach to use Bi-2212 inner windings, perhaps opening the path to 25 T and an LHC Tripler [9]. Process simplification may allow a higher energy HEP frontier machine to be affordable.…”

Advanced Accelerator Magnets for Upgrading the LHC

“…The possibility of an energy upgrade of the LHC has been already mentioned in 2001 [32] and a few years later a proposal for a LHC tripler based on a 24 T operating field dipole was put forward in 2006 [33], however with a current density of 800 A/mm 2 , today not yet achievable. Recently at CERN a study have been carried out [34], [35]: the target field for the main dipoles, the main driver of the entire project, has been set to 20 T operative field in a 40 mm bore, which will enable the High Energy LHC (HE-LHC) to reach 33 TeV center-of-mass energy for proton collisions.…”

Superconducting Magnet Development for the LHC Upgrades

“…The possibility of an energy upgrade of the LHC based on a dipole having an operating field of 24 T was put forward in 2006 35) . This was based, however, on a current density of 800 A/mm 2 -still far from being achievable.…”