Can beam ports, magnets, and neutrons live together in harmony?

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Presentation transcript:

Can beam ports, magnets, and neutrons live together in harmony? Presented by: Jeff Latkowski HAPL Program Workshop Naval Research Laboratory March 3-4, 2005 Work performed under the auspices of the U. S. Department of Energy by Lawrence Livermore National Laboratory under Contract W-7405-Eng-48.

Overview Radiation limits for superconducting magnets Proposed beam layouts & required modifications Radiation levels for unshielded magnets Preliminary shielding design & results

What limits the radiation lifetime of superconducting magnets? Total dose to the insulators is limited to 100 MGy (ref. 1); tends to be dominated (>95%) by contribution from gamma-rays “Conservative limit” for the fast neutron fluence (En  0.1 MeV) in NbTi superconductor is 1019 n/cm2 (ref. 1): Room-temperature anneal required after 3  1018 n/cm2 70% recovery assumed Inorganic insulators that may be usable with high-temperature superconductors (HTS) offer significantly (~103) greater limits (ref. 2) HTS appear to have fast neutron fluence limits that are at least as good as that for NbTi (ref. 2) References: (1) Sawan and Walstrom (2) Bromberg, ARIES meeting (Jan. 2002)

A 5-coil layout has been proposed by Bertie Robson 60 beam ports in the Omega direct-drive configuration 60-cm-diameter ports at top & bottom 55-cm-tall slot at the equator

Plots of the neutronics model shows beams, chamber, blanket, neutron dumps & coils

Plots of the neutronics model shows beams, chamber, blanket, neutron dumps & coils

The 1st and 5th set of coils had to be moved inward by 1.25 meters top & bottom coils get clobbered by beams

Malcolm McGeoch has proposed a 64-beam layout with 4-fold symmetry

The 2nd / 4th coils were moved 30 cm towards the equator avoid the nearest beamports

Without shielding the superconducting coils would not last long Estimated lifetimes from an insulator dose perspective

An un-optimized shielding design extends lifetimes to the desired range Shielding has been added to each coil in the McGeoch layout: Many optimization studies could be envisioned for the coil shielding: minimum cost, thickness, mass, etc. Note: Arbitrarily selected a flibe blanket (1-m-thick with 5% structure and 95% flibe)  TBR = 1.09

Plots of the neutronics model shows beams, chamber, blanket, neutron dumps & coils