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Shielding of the Final Focusing System in the HIF Point Design* by Jeff Latkowski and Wayne Meier ARIES Projct Meeting January 8-9, 2003 *Work performed.

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Presentation on theme: "Shielding of the Final Focusing System in the HIF Point Design* by Jeff Latkowski and Wayne Meier ARIES Projct Meeting January 8-9, 2003 *Work performed."— Presentation transcript:

1 Shielding of the Final Focusing System in the HIF Point Design* by Jeff Latkowski and Wayne Meier ARIES Projct Meeting January 8-9, 2003 *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—ARIES 1/8/03 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 10 19 n/cm 2 for NbTi superconductor (room temp anneal at 3  10 18 with 70% recovery) Avoid generation of above Class C waste, if possible

3 JFL—ARIES 1/8/03 The new HIF point design was modeled Chamber Beam Map 24 foot / 36 main (Same both sides) Neutronics Model Shown is slice through last set of magnets (Note: model rotates actual by 45º)

4 JFL—ARIES 1/8/03 HIF point design, (Cont’d.) HIF RPD-2002 Cross Jets Jets are positioned in rows at specified distances from the target, on vectors spaced 5.4° apart. Neutronics Model Details of the cross jets are included

5 JFL—ARIES 1/8/03 The flibe jets, vortex tubes, and final three focusing magnets are modeled

6 JFL—ARIES 1/8/03 Neutronics modeling for the new HIF point design is quite detailed

7 JFL—ARIES 1/8/03 Results: Magnet heating & cooling Prompt heating of superconductor, stabilizer, and insulation is very low (~17  J/cc/shot)  little risk of quench from nuclear heating Even if all magnets had to be cooled to liquid helium temperatures, the recirculating power would be only ~3 MW e Cooling of the larger shielding blocks, however, would be expensive. If these must be cooled to LHe temperatures, an additional 40 MW e is required

8 JFL—ARIES 1/8/03 Results: Magnet lifetimes and waste disposal rating (WDR) Last magnet: Insulator lifetime = 230 full-power-years (FPY) Superconductor lifetime = 260 FPYWDR = 1.68 2 nd -to-last magnet: Insulator lifetime = 410 FPY Superconductor lifetime = 1580 FPYWDR = 0.42 3 rd -to-last magnet: Insulator lifetime = 100 FPY Superconductor lifetime = 610 FPYWDR = 0.48

9 JFL—ARIES 1/8/03 Significant performance increases result from: (1) a reduction in vortex liquid stand-off distance, and (2) a reduction in the beam focusing angle (10 mrad) Aggressive liquid stand-off distance of only 1 mm assumed in vortices; Past work suggests that increasing this to 5 mm reduces lifetimes by ~2x  Need to confirm for this specific layout Trade-off insulator lifetime (gammas) vs. superconductor WDR for last magnet  with large margin, should be able to achieve both WDR<1 and lifetime magnets Add beam neutralization hardware, liquid jet nozzles Look at life-cycle waste volume vs. shielding design (long life magnets may actually increase overall waste volume) Synthesis & additional work

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