A radiation hard dipole magnet coils using aluminum clad copper conductors

Leonhardt, W.

doi:10.1109/pac.1989.72844

Cited by 2 publications

(1 citation statement)

References 2 publications

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“…A more efficient hollow conductor would have a sheath that is much stronger than copper and insulation that is thinner-perhaps anodized aluminum [5], or a ceramic coating [6] or wrap [7]. If the insulation could survive radiation when wet, then one could consider a Bitter magnet, such as the one at MIT's Francis Bitter National Magnet Laboratory that, at 9 MW, contributed 11 T to a hybrid magnet that generated 22.5 T in a 15 cm bore.…”

Section: R and D Needed For More Efficient Insertsmentioning

confidence: 99%

Design study for 20 T 15 cm bore hybrid magnet with radiation-resistant insert for pion capture

Weggel

Pearson²,

King³

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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To capture pions the Neutrino Factory and Muon Collider Collaboration needs a field of~20 T throughout a cylinder 15 cm in diameter and 60 cm long, falling over the next 18 m to 1.25 T, while the bore increases fourfold inversely as the square root of the field. We propose a hybrid system. The superconducting magnet is of worldclass parameters, storing 600 MJ and including a coil to generate 14 T in a bore of~1.3 m. Intercoil forces reach 100 MN. For high radiation resistance, the insert coil is of mineral-insulated hollow conductor, as developed for the Japan Hadron Facility; it would require 12 MW to generate 6 T. Needed is research to develop a more efficient hollow conductor or radiation-resistant insulator for a Bitter coil. SYSTEM PARAMETERSFor a neutrino factory one can generate pions by bombarding a target with a multi-GeV proton beam of 1 MW or more. As the target, the Collaboration's "Feasibility Study II" proposes a mercury jet or a moving metal band. A solenoidal magnetic field bends the pion trajectories into helices; 20 T in a bore of 15 cm captures pions with a transverse momentum up to 225 MeV/c.The desired field profile is uniform over the target, followed by a gradual transition to the much lower field of subsequent components of the neutrino factory. For minimal particle loss the optimum field profile is B(z) = B 0 /[1+kz/L], where B 0 is the field at z = 0, the downstream end of the target, and k+1 is the ratio of B 0 to the field at L = 18 m, the downstream end of the transition region. Within the target region itself, l < z < 0, the field should sag no more than~5% near its ends, to limit the field gradient that tends to shear the jet of mercury entering and leaving the target region.To generate this field we employ magnets of three types: superconducting (SC), resistive and ferromagnetic. SC magnets generate almost all the field, except near the target. There one needs a resistive insert that, with shielding only 10 cm, not 30 cm, thick, can survive the intense radiation emanating from the target. Just upstream of the target region is a ferromagnetic plug, to contributẽ 1.0 T. Its field gradient cancels some of the field inhomogeneity of the other coils, which tends to shear the jet of mercury.

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Section: R and D Needed For More Efficient Insertsmentioning

confidence: 99%