A design is being developed to prototype for a dipole for this purpose: a block-coil dipole with ... more A design is being developed to prototype for a dipole for this purpose: a block-coil dipole with 13 T shortsample field, 11 T working field, and 6 cm aperture. The dipole is a natural application of the high-field dipole strategy developed at Texas A&M, using simple pancake windings, flux-plate suppression of low-field multipoles, and bladder preloading. A short model dipole is planned.
The block coil geometry utilized in recent high-field dipole development has significant benefit ... more The block coil geometry utilized in recent high-field dipole development has significant benefit for applications requiring rapid cycling, since it intrinsically suppresses coupling currents between strands. A conceptual design for a 6 Tesla dipole has been studied for such applications, in which the intra-strand losses are minimized by using bronze-process Nb 3 Sn superconducting wire developed for ITER. That conductor provides isolated fine filaments and optimum matrix resistance between filaments. The block-coil geometry further accommodates placement of He cooling channels inside the coil, so that heat from radiation and from AC losses can be removed with minimum temperature rise in the coil. The design could be operated with supercritical helium cooling, and should make it possible to operate with a continuous ramp rate of 5-10 T/s.
A design is presented for a hadron collider in which the magnetic storage ring is configured as a... more A design is presented for a hadron collider in which the magnetic storage ring is configured as a circular pipeline, supported in neutral buoyancy in the sea at a depth of ~100 m. Each collider detector is housed in a bathysphere the size of the CMS hall at LHC, also neutral-buoyant. Each half-cell of the collider lattice is ~300 m long, housed in a single pipe that contains one dipole, one quadrupole, a correction package, and all umbilical connections. A choice of ~4 T dipole field, 2000 km circumference provides a collision energy of 700 TeV. Beam dynamics is dominated by synchrotron radiation damping, which sustains luminosity for >10 hours. Issues of radiation shielding and abort can be accommodated inexpensively. There are at least ten sites world-wide where the collider could be located, all near major urban centers. The paper summarizes several key issues; how to connect and disconnect half-cell segments of the pipeline at-depth using remote submersibles; how to maintain ...
A succession of Nb3Sn block-type dipoles has been developed at the Texas Agricultural and Mechani... more A succession of Nb3Sn block-type dipoles has been developed at the Texas Agricultural and Mechanical (A&M) University and tested, in a progression of stages aimed toward 16 T operation field. This chapter describes the details of magnet design, fabrication procedures, and test results.
Recent developments in accelerator physics and superconducting magnet technology make it reasonab... more Recent developments in accelerator physics and superconducting magnet technology make it reasonable to extend proton-antiproton colliding beams from the 2 TeV of the Tevatron to 100 TeV in the existing SSC tunnel. The antiproton source and collider scenarios at the Tevatron yield accumulation of >2 x 10 p /hr, cooling and stacking of >2 x 10 p in 10 hr. Control of emittance growth mechanisms yields collisions with luminosity >2 x 10 cms in each store and luminosity lifetime >10 hr. Nb3Sn dipole development has yielded field strength >16 T, and 4-m-long coils using this technology have been tested successfully. We present a conceptual for a 100 TeV collider in which a single 16 T magnet ring is located in the SSC tunnel, and discuss issues from synchrotron radiation, electron cloud effect, and beam separation.
A flux-coupled stack of isochronous cyclotrons has been proposed as a driver for Accelerator-Driv... more A flux-coupled stack of isochronous cyclotrons has been proposed as a driver for Accelerator-Driven Subcritical Systems (ADSS) for thorium-cycle fission power. The issues that limit beam current and phase space brightness are evaluated, including space charge tune shift, synchro-betatron coupling, orbit separation at injection and extraction, RF parasitic modes and propagation within the accelerator envelope, and stability of electrostatic septum operation.
A conceptual design is presented for a 100 TeV hadron collider based upon a 4.5 T NbTi cable-in-c... more A conceptual design is presented for a 100 TeV hadron collider based upon a 4.5 T NbTi cable-in-conduit dipole technology. It incorporates a side radiation channel to extract synchrotron radiation from the beam channel so that it does not produce limitations from heating on a beam liner or gas load limits on collider performance. Synchrotron damping can be used to support ‘bottom-up’ stacking to sustain maximum luminosity in the collisions.
IEEE Transactions on Applied Superconductivity, 2018
Dipoles with 15-20 T operating field are required for some designs of future hadron colliders. Su... more Dipoles with 15-20 T operating field are required for some designs of future hadron colliders. Such dipoles require the use of high-field superconductors Nb3Sn, Bi-2212, and REBCO. Designs are presented for hybrid block-coil dipoles using superconducting cable-in-conduit (CICC). CICC conveys several benefits that optimize cost and performance at high field: cable-level stress management; compact, robust flared ends; and in-cable cryogen flow. CICC windings uniquely make possible a hybrid coil configuration in which sub-windings of Bi-2212, Nb3Sn, and NbTi can be separately wound and heat-treated, and then assembled and preloaded in a compact assembly.
A conceptual design is presented for the 50 Tesla superconducting solenoids that are required for... more A conceptual design is presented for the 50 Tesla superconducting solenoids that are required for an optimized fast cooling ring in current designs for multi-TeV muon colliders. The solenoid utilizes high-performance multifilament Bi-2212/Ag round strand. The conductor is a cable-in-conduit consisting of six such strands cabled around a thin-wall spring tube then drawn within an outer sheath. The spring tube and the sheath are made from high-strength superalloy Inconel. The solenoid coil comprises 5 concentric shells supported independently in the conventional manner. Each shell consists of a winding of the structured cable, impregnated in the voids between cables but empty inside so that the spring tubes decouple stress so that it cannot straindegrade the fragile strands, and a high-E stress shell. An expansion bladder is located between the winding and the stress shell. It is pressurized and then frozen to provide hydraulic compressive preload to each shell. These provisions makes it possible to accommodate ~10 T field contribution from each shell without degradation, and to distribute refrigeration so that heat is removed throughout the volume of the windings.
The design of high-field dipoles has been optimized using a block coil geometry. The object of th... more The design of high-field dipoles has been optimized using a block coil geometry. The object of the optimization is to produce the highest possible field strength with the least superconductor, while managing the challenges of Lorentz stress, field uniformity, and quench stability and protection. The optimization includes strategies for stress manage- ment, mixed-strand cables, and flux plate suppression of magnetization multipoles. We have recently developed a further step in this optimization: a hybrid coil geometry con- taining inner windings of Bi-2212 and outer windings of Nb3Sn. We have used this ap- proach to design a 24 Tesla dual dipole that should be suitable for an upgrade of the Large Hadron Collider, tripling its beam energy. Issues of fabrication technology and synchrotron radiation control are discussed. With this approach there is no obvious limit to the field that could be attained in the dipoles of future hadron colliders. The impact upon potential for discovery in ...
IEEE Transactions on Appiled Superconductivity, 1997
A succession of Nb 3 Sn block-type dipoles has been developed at the Texas Agricultural and Mecha... more A succession of Nb 3 Sn block-type dipoles has been developed at the Texas Agricultural and Mechanical (A&M) University and tested, in a progression of stages aimed toward 16 T operation field. This chapter describes the details of magnet design, fabrication procedures, and test results.
The potential for thorium as an alternative or supplement to uranium in fission power generation ... more The potential for thorium as an alternative or supplement to uranium in fission power generation has long been recognised, and several reactors, of various types, have already operated using thorium-based fuels. Accelerator Driven Subcritical (ADS) systems have benefits and drawbacks when compared to conventional critical thorium reactors, for both solid and molten salt fuels. None of the four options–liquid or solid, with or without an accelerator–can yet be rated as better or worse than the other three, given today's ...
A design for accelerator-driven subcritical fission in a molten salt core (ADAM) has been made fo... more A design for accelerator-driven subcritical fission in a molten salt core (ADAM) has been made for the purpose of destroying the transuranic elements in used nuclear fuel as fast as they are made in a conventional nuclear power plant. The oxide fuel is extracted from the used fuel assemblies into molten chloride salt using pyroprocessing, and the transuranic, uranium, and fission product salts are separated into three batches using electroseparation. The transuranic salt is then transferred to a subcritical core, with neutron gain 0.97. The core is driven by 800 MeV proton beams from a 12 mA CW strongfocusing cyclotron. The transuranics are destroyed and the fission heat is used to produce electric power. Simulations of many potential failure modes have been performed; the core cannot reach criticality in any failuremode scenario considered. It operates as an energy amplifier with an energy gain ~5.5.
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Papers by Peter McIntyre