Jeff Latkowski and Wayne Meier

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Presentation transcript:

Jeff Latkowski and Wayne Meier Waste Disposal Assessment for the Final Focusing Magnets in the RPD-2002* by Jeff Latkowski and Wayne Meier ARIES Project Meeting May 5-6, 2003 *Work performed under the auspices of the U. S. Department of Energy by Lawrence Livermore National Laboratory under Contract W-7405-Eng-48.

General requirements for the final focusing magnet shielding design Shielding design consistent with target beam requirements (e.g., half-angle of array <30º) Magnets don’t quench on a per-shot basis (limits energy deposition in superconductor regions to ~100 mJ/cc/shot) Recirculating power for magnet cooling doesn’t cause unacceptably large economic hit Magnets have reasonable radiation damage lifetime: 100 MGy for insulators (dominated by gamma-rays) Fast neutron fluence of 1019 n/cm2 for NbTi superconductor (room temp anneal at 3  1018 with 70% recovery) Avoid generation of above Class C waste, if possible

General requirements for the final focusing magnet shielding design Shielding design consistent with target beam requirements (e.g., half-angle of array <30º) Magnets don’t quench on a per-shot basis (limits energy deposition in superconductor regions to ~100 mJ/cc/shot) Recirculating power for magnet cooling doesn’t cause unacceptably large economic hit Magnets have reasonable radiation damage lifetime: 100 MGy for insulators (dominated by gamma-rays) Fast neutron fluence of 1019 n/cm2 for NbTi superconductor (room temp anneal at 3  1018 with 70% recovery) Avoid generation of above Class C waste, if possible

Neutronics modeling for the new HIF point design is quite detailed

Results: Magnet lifetimes and waste disposal rating (WDR) Last magnet: Insulator lifetime = 230 full-power-years (FPY) Superconductor lifetime = 260 FPY WDR = 1.68 2nd-to-last magnet: Insulator lifetime = 410 FPY Superconductor lifetime = 1580 FPY WDR = 0.42 3rd-to-last magnet: Insulator lifetime = 100 FPY Superconductor lifetime = 610 FPY WDR = 0.48

Results: Magnet lifetimes and waste disposal rating (WDR) Last magnet: Insulator lifetime = 230 full-power-years (FPY) Superconductor lifetime = 260 FPY WDR = 1.68 Last magnet: Insulator lifetime = 230 full-power-years (FPY) Superconductor lifetime = 260 FPY WDR = 1.68 2nd-to-last magnet: Insulator lifetime = 410 FPY Superconductor lifetime = 1580 FPY WDR = 0.42 3rd-to-last magnet: Insulator lifetime = 100 FPY Superconductor lifetime = 610 FPY WDR = 0.48

Results: Magnet lifetimes and waste disposal rating (WDR) Last magnet: Insulator lifetime = 230 full-power-years (FPY) Superconductor lifetime = 260 FPY WDR = 1.68 Last magnet: Insulator lifetime = 230 full-power-years (FPY) Superconductor lifetime = 260 FPY WDR = 1.68 2nd-to-last magnet: Insulator lifetime = 410 FPY Superconductor lifetime = 1580 FPY WDR = 0.42 3rd-to-last magnet: Insulator lifetime = 100 FPY Superconductor lifetime = 610 FPY WDR = 0.48 This is waste disposal rating for the NbTi coil. What is the value for the magnet as a whole?

Magnet radial build Central void 1.5 cm NbTi (28 v%) + Cu (48 v%) + LHe (14 v%) + insulation (10 v%) 1 cm steel beampipe (40 v%) + H2O cooling (30 v%) + Insulation (30 v%) 1 cm layers of Ti-poly* 1 cm steel casing 1 cm layers of W-poly* 0.5 cm steel liner Insulation/gaps (1.0, 0.2, 0.5 cm) 6 cm steel banding * Reactor Experiments, Inc.

SS #304 composition includes 0.005 wt% Nb and 0.33 wt% Mo WDR for average magnet } SS #304 composition includes 0.005 wt% Nb and 0.33 wt% Mo

WDR for average magnet Total volume = 32.1 m3

WDR for average magnet Total volume = 32.1 m3 Mixed WDR = 0.18

Magnet waste disposal ratings are low enough to meet Class C requirements Last set of magnets would have average WDR of 0.18  should qualify as Class C even with increased beam-to-structure stand-off distance (present results all assume 1 mm clearance; move to 5 mm clearance gives ~2x increase in activation & doses) Even coil regions of 2nd-to-last and 3rd-to-last magnets have WDR<1 Variability between magnets is relatively small – certainly not 5 about average  no individual magnets should exceed WDR=1 Have not included impurities in shielding materials from R/X, Inc.: Impurities are unlikely to be bad enough to change classification Will perform study to determine impurity limits in W-poly and Ti-poly As designs progress, should continue to monitor magnet lifetime, waste disposal rating, etc.