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Status of the FRIB Project and a New Fragment Separator

Status of the FRIB Project and a New Fragment Separator. D.J. Morrissey, NSCL & Dept. of Chemistry, Michigan State Univ. 1976. Projectile Fragmentation provides an enormous range of unusual ions without decay losses and without chemical speciation. Search for n-Dripline Future Facility.

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Status of the FRIB Project and a New Fragment Separator

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  1. Status of the FRIB Project and a New Fragment Separator D.J. Morrissey, NSCL & Dept. of Chemistry, Michigan State Univ. 1976 • Projectile Fragmentation provides an enormous range of unusual ions without decay losses and without chemical speciation. • Search for n-Dripline • Future Facility 2o1o

  2. The NSCL: a national user facility for rare isotope research and education Parking Chemistry Law Physics Biochemistry Crop & Soil Sci. 2oo8

  3. The Neutron Drip Line for low Z nuclei The location of the neutron drip line is only known up to Oxygen! No 25, 26O .. Fauerbach, et al. Phys. Rev. C53 (96) 647 Yes 34Ne & 37Na .. Notani et al., Phys. Lett. B542 (2oo2) 49 Yes 44Si .. Tarasov, et al. Phys. Rev. C75(o7) 064613 Yes 40Mg & 42Al .. Baumann, et al. Nature449 (o7) 1022

  4. Where is the Neutron Drip line in Theory? Z=13 Z=13 Yellow Squares: already observed Black Line: Finite-Range Liquid-Drop Moeller, et al. ADNDT 59 (1995) 185 Greeen Lines: Hartree-Foch-Bogoliubov Goriely, et al. Nucl.Phys. A750 (2oo5)425 http://www-astro.ulb.ac.be/Html/hfb14.html

  5. A19oo only A19oo & S8oo line Where is the Neutron Drip Line? Two Stage Separator natW(48Ca,29F) 140 MeV/u • Example of Beam Purification with a tandem separator: • Fragment Separators set for maximum yield of 29F9+ • Particle ID with equivalent total number of events • 29F, 27F, 24O highlighted in both figures • One separator data is dominated by low-Z events that are rejected in tandem separator • 7.6 days beam on W target, ~1x10-15 suppression during 40Mg run – A1900: O. Tarasov, et al. Phys.Rev.C75 (2oo7) 064613 – A1900/S800: T. Baumann et al. Nature 449 (2oo7) 1022

  6. Systematics of Production: 44Si30 from 48Ca28 O. Tarasov, et al. Phys.Rev.C75 (2oo7) 064613 Qg = MassExcess(20,48) - MassExcess(Z,A) lower mass data from: – Mocko, et al. Phys. Rev. C74 (2oo6) 054614 – Notani, et al. Phys. Lett.B542 (2oo2) 49

  7. Approaching the Neutron Drip Line Our work from 2oo7 in Nature 449 (2oo7) 1022 with the unexpected production of heavy aluminum isotopes was followed up with the observation late in 2oo8 of 15 new isotopes from 76Ge beam using a new target-technique New region Pink line is a prediction: Koura, Tachibana, Uno & Yamada Prog.Theo. Phys. 113 (2oo5) 305 O. Tarasov et al. PRL 102 (2oo9) 142501

  8. Approaching the Neutron Drip Line: a More importantly the variation of the production cross sections of some of the most exotic nuclei lie above the systematic slope … New region Pink line is a prediction: Koura, Tachibana, Uno & Yamada Prog.Theo. Phys. 113 (2oo5) 305 O. Tarasov et al. PRL 102 (2oo9) 142501

  9. Approaching the Neutron Drip Line: b More importantly the variation of the production cross sections of some of the most exotic nuclei lie above the systematic slope … Pink line is a prediction: Koura, Tachibana, Uno & Yamada Prog.Theo. Phys. 113 (2oo5) 305 O. Tarasov et al. PRL 102 (2oo9) 142501

  10. Theoretical Prediction of Intruder G.States Fig. 22 Variation of S2n , solid points measured, open theory. Fig. 1 … The circles show the regions of intruder ground-state configurations. [Text suggests 62Ti is center ]

  11. US Dept. of Energy interest in FRIB? DOE Nuclear Physics Mission: to understand the fundamental forces and particles of nature as manifested in nuclear matter and provide the necessary expertise and tools from nuclear science to meet national needs. This mission is accomplished by supporting scientists who can answer overarching questions in major scientific thrusts of nuclear physics research. Thrusts defined by, e.g., National Academy of Science, Nucl. Sci. Adv. Comm. 2007

  12. ~ 1.5 year ago, Proposal for FRIB accepted • Driver linac with E/A  200 MeV for all ions, Pbeam = 400 kW • Various possibilities for optional upgrade • (e.g., higher energy, ISOL, multi-user capability …) • Fast, stopped, and reaccelerated beams • Use of existing NSCL • Enables continuing scientific program • Fast start of FRIB scientific program

  13. FRIB Location on the MSU Campus Brown .. Existing Buildings Red .. Present Experimental hall Green .. Reaccelerator Exp. and Offices just completed, 2oo9 Blue .. FRIB new construction

  14. 2o1o: Intense Reviews, Alternatives Analyzed ✔ = chosen 8 = not chosen 3 8 ✔ 8 3 1 1 1 2 2 • > 200 MeV/nucleon, 400 kW for all ions; fast, stopped, reaccelerated beams • Upgrade options Upgrade options Upgrade options • > 400 MeV/nucl for all ions > 400 MeV/nucl for all ions > 300 MeV/nucl for all ions • Space to double exp. area 1) Space to double exp. area 1) Space to double exp. area • ISOL 2) ISOL 2) ISOL • Light ion injector 3) Light ion injector 3) Light ion injector • Multi-user Multi-user Multi-user G. Bollen, 26 April 2010 , Slide 17

  15. FRIB Linac Configuration, 2o1o • Physically compact layout • Minimize subterranean structures • Single tunnel for all linac segments Ground level

  16. Proposed FRIB 3-Stage Fragment Separator Large acceptance preseparator under detailed ion-optical study [ Sherrill and Hausmann ] High power target, beam dump and remote handling play very significant roles in the design considerations

  17. NSCL in 2o1o • High-bay expansion to accommodate reaccelerated beam program • MSU has constructed a new 10,000 ft2 highbay • ReA3 reaccelerator is under construction (injection, RFQ, 1 of 3 cryomodules in place) • New stopped beam area to accommodate: • Exisiting LEBIT facility (moving now) • New laser spectroscopy line (under construction) • N4 gas stopping vault with three beam lines • New momentum compression line for new cryogenic linear stopper (~60% complete) • New large acceptance momentum • compression line (installation beginning) • New beamline stub for thermal ionizer New experimental area for reaccelerated beams New stopped beam area

  18. NSCL in 2o18 ? • FRIB will provide projectile fragments at unprecedented rates • Project is up and running • Formal review of Conceptual Design (CD-1) in July, 2o1o • A full suite of experimental equipment will be available for fast (F) , stopped (S) and reaccelerated beams (R ) • New equipment will be available for thermal and reaccelerated beams • Thermal beam area (Trap and Atomic Spec.) • Active Target TPC (under construction)

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