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Final Focus Magnet Shielding Update Jeff Latkowski and Wayne Meier ARIES Meeting October 2-4, 2002 Work performed under the auspices of the U. S. Department.

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Presentation on theme: "Final Focus Magnet Shielding Update Jeff Latkowski and Wayne Meier ARIES Meeting October 2-4, 2002 Work performed under the auspices of the U. S. Department."— Presentation transcript:

1 Final Focus Magnet Shielding Update Jeff Latkowski and Wayne Meier ARIES Meeting October 2-4, 2002 Work performed under the auspices of the U. S. Department of Energy by Lawrence Livermore National Laboratory under Contract W-7405-Eng-48.

2 JFL—10/02 ARIES Outline Review/update of point design results from last meeting Analysis for “off-center” target implosions Issues/comments for case without beamline cross jets & plans for FY03

3 JFL—10/02 ARIES General requirements for the final focusing magnet shielding design Shielding design consistent with target beam requirements (e.g., half-angle of array <24º) Magnets don’t quench on a per-shot basis (limits energy deposition to ~100 mJ/cc/shot) Recirculating power for magnet cooling doesn’t cause unacceptably large economic hit Magnets have reasonable radiation damage lifetime Avoid generation of above Class C waste, if possible

4 JFL—10/02 ARIES What limits the radiation lifetime of the final focusing magnets? Total dose to the insulators is limited to 100 MGy (ref. 1); tends to be dominated (90-95%) by contribution from gamma-rays “Conservative limit” for the fast neutron fluence (E n  0.1 MeV) in Nb 3 Sn superconductor is 10 19 n/cm 2 (ref. 1): –Room-temperature anneal required after 3  10 18 n/cm 2 –70% recovery assumed Inorganic insulators that may be usable with high-temperature superconductors (HTS) offer significantly (~10 3  ) greater limits (ref. 2) HTS appear to have fast neutron fluence limits that are at least as good as that for Nb 3 Sn (ref. 2) References: (1)Sawan and Walstrom (2)Bromberg, ARIES meeting (Jan. 2002)

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6 shielding structure for last magnet set target injection pathway cylindrical crossing flibe jets for gross beamline shielding target location at shot time vortex tubes for precision beamline shielding

7 size of beam at front of last magnet 1 cm of structure, insulation, and H 2 O cooling alternating layers (1 cm each/5 cm total) of W and a proprietary material (good for neutrons) 1 cm of structure, insulation, and LN 2 cooling (inside and outside coil) 3 cm thick coil region (40 vol% each of Cu and Nb 3 Sn + 20 vol% LHe) 2.3 cm of SS304 for banding/shielding

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9 JFL—10/02 ARIES Review of point design results from last meeting Results for the final magnet: –Average insulator lifetime (total dose limited): 26 years (18-42) –Average superconductor lifetime (  n,fast limited): 33 years –WDR coil = 14 Second-to-last magnet: –Insulator lifetime: 300 years –Superconductor lifetime (  n,fast limited): 33 years –WDR coil = 5.6 Third-to-last magnet: –Insulator lifetime: 120 years –Superconductor lifetime (  n,fast limited): 33 years –WDR coil = 15 1 st room-temp anneal needed at ~10 years

10 JFL—10/02 ARIES Insulator lifetime of 100 MGy assumed. Analysis performed for “off-center” targets Target position was varied by 0.5 cm in two directions: –Along the axis of symmetry –Perpendicular to the axis of symmetry The average insulator lifetime is insensitive to the target position at “bang time.”

11 JFL—10/02 ARIES The distribution of magnet lifetimes (not all are equal) is essentially unchanged We observe a slight shift in the magnet lifetime distribution Effect is probably not real, but statistical Error bars are 15-20% (2-4 years at the low end and 5-9 years at the high end) Waste disposal results are unaffected

12 JFL—10/02 ARIES Issues/comments for case without beamline cross jets Assume that wetted wall protects structural material from x-ray and ion threats Removing liquid cross jets increases neutron damage to port plug structure by nearly 5x Expect magnet dose to increase by similar factor; Compensate by thickening port plug? Port plug is difficult location to tolerate damage given desire for precision shielding; need swelling- tolerant design  variable thickness liquid vortices?

13 JFL—10/02 ARIES Examine damage to vortex structures and flow nozzles Address port plug issues in more detail Waste disposal needs considerable improvement: WDR coil = 14 ( 94 Nb) for last magnet; consider high- temperature (low-activation, in some cases) superconductors? Look at life-cycle waste volume vs. shielding design (ironically, long life magnets may actually increase overall waste volume and lead to production of high- level waste) Work is planned for FY03 Additional work is needed for the final focus shielding issues

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