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

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Presentation on theme: "Can beam ports, magnets, and neutrons live together in harmony?"— Presentation transcript:

1 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.

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

3 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)

4 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

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

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

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

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

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

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

11 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

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

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