Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session Q13: Mini-Symposium: FRIB and ReA Instrumentation IFocus
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Sponsoring Units: DNP Chair: Andrew Rogers, UMass Lowell Room: Sheraton Plaza Court 2 |
Monday, April 15, 2019 10:45AM - 11:21AM |
Q13.00001: FRIB and ReA instrumentation for Nuclear Astrophysics Invited Speaker: Artemis Spyrou In the era of multi messenger astronomy, together with the electromagnetic, neutrino and gravitational-wave signals, having accurate nuclear input is more important than ever for interpreting astrophysical events. The properties of exotic nuclei, such as their mass, their half life, and their overall structure, together with how these nuclei can capture particles (neutrons, protons, alphas) or photodisintegrate in the stellar environment, are critical. Such a diverse need for nuclear properties, requires the development for a diverse set of tools. In this talk I will present the experimental equipment that is currently available at the National Superconducting Cyclotron Laboratory (NSCL) for Nuclear Astrophysics experiments, as well as the plans for new instrumentation, under development for the Facility for Rare Isotope Beams (FRIB). This equipment is (and will be) used in conjunction with fast radioactive beams (~100 MeV/u), with “stopped” beams (~40 keV), and with re-accelerated beams from the ReA facility (0.5-4 MeV/u). The broad suite of experimental equipment and its use in Nuclear Astrophysics experiments will be presented. |
Monday, April 15, 2019 11:21AM - 11:33AM |
Q13.00002: The SOLARIS spectrometer B. P. Kay SOLARIS is a dual-mode solenoidal spectrometer for the reaccelerated (ReA) beam facility at the National Superconducting Cyclotron Laboratory (NSCL), and subsequently the Facility for Rare Isotope Beams (FRIB). The design is optimized for the study of a broad range of transfer and inelastic-scattering reactions at incident beam energies around the Coulomb barrier with good Q-value resolution and efficiency. In one mode of operation, SOLARIS will support an on-axis Si array, like the HELIOS spectrometer at Argonne National Laboratory, primarily for reaction measurements with beam intensities greater than 104 particles per second. In the other mode, the NSCL Active Target Time Projection Chamber (AT-TPC) will occupy the bore of the solenoid, taking advantage of the up to 4-T field. An overview of SOLARIS, the planned implementation of SOLARIS on the ReA6 beamline, and physics opportunities will be presented. |
Monday, April 15, 2019 11:33AM - 11:45AM |
Q13.00003: ISLA Preliminary Design Performance A. Matthew Amthor, Daniel Bazin, Alexandre Comsa, Wolfgang Mittig The Isochronous Separator with Large Acceptance (ISLA) was identified by the ReA12 Recoil Separator working group of the FRIB Users Organization as the single device that meets the needs of all the physics cases proposed by the community for studies with reaccelerated rare isotope beams from ReA at FRIB. ReA will reaccelerate stopped FRIB beams to energies ideal for transfer reactions, multiple Coulomb excitation, fusion, and deep inelastic scattering. ISLA will provide efficient rejection of unreacted beam; large acceptances of momentum (±10%), angle (64 msr), and charge state (±10%) distributions; and high M/Q resolving power (>400) for reaction products. The purely magnetic system will accept magnetic rigidities up to 2.5Tm, to match ReA12 incoming beam rigidities and have no electric rigidity limit. M/Q separation in time-of-flight and a long preceding drift will allow efficient detection at a compact focal plane. Recent progress will be presented on the optimization of the magnetostatic design of the four large multi-function ISLA dipoles, the performance of the current designs in advanced Monte Carlo simulations of ISLA, and the evaluation of design alternatives for tunable quadrupole field components.
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Monday, April 15, 2019 11:45AM - 11:57AM |
Q13.00004: GODDESS and the ORRUBA arrays for ReA and Fast Beams at FRIB Steven D. Pain The Facility for Rare Isotope Beams (FRIB) will give unprecedented access to fast and reaccelerated beams of exotic nuclei with intensities and energies appropriate for direct reaction studies. The large-solid-angle, highly segmented ORRUBA and superORRUBA silicon detector arrays routinely operate at the NSCL/FRIB for both fast beam and reaccelerated beam experiments, and are anticipated to continue at FRIB. The deployment of these detectors is enhanced by coupling to GRETINA/GRETA in a system known as GODDESS, which will provide a ~4pi particle gamma spectrometer with mm spatial resolution and semiconductor energy resolution. superORRUBA is routinely coupled to the JENSA gas-jet target for direct reaction studies with ReA3 beams. These systems also include fast ionization chambers for beam/recoil measurement. An overview of the instrumentation and some of the physics interest will be discussed. |
Monday, April 15, 2019 11:57AM - 12:09PM |
Q13.00005: Production of thin, self-supporting 28Si foils for near barrier fusion experiments with radioactive beams Carley Folluo, James E Johnstone, Sylvie Hudan, Tyler A Werke, Romualdo Desouza In the era of radioactive beams several experiments require production of isotopically enriched targets. Use of enriched starting material requires that the production process for making the target be as efficient as possible. It is additionally challenging when the experiments are low-energy and require that the targets be thin and self-supporting. The design, construction and performance of an electron gun evaporation system at Indiana University is detailed. Using natSi the choice of substrate and thickness of release agent used in the evaporation process was determined. The successful production of the 28Si targets necessary for an upcoming experiment is described. |
Monday, April 15, 2019 12:09PM - 12:21PM |
Q13.00006: Measurements with the JENSA gas jet target and the status of SECAR at ReA Louis Wagner For a deeper understanding what drives nucleosynthesis in astrophysical scenarios like novae and x-ray bursts, p and α capture reactions with unstable isotopes are important. Radioactive ion beam accelerators like at the Facility for Rare Isotope Beams (FRIB) give us great opportunities to study these reactions experimentally. The Jet Experiments in Nuclear Structure and Astrophysics (JENSA) gas target system at ReA was constructed to take advantage of these beams at the National Superconducting Cyclotron Laboratory (NSCL) for direct measurements of α capture reactions. A recoil separator right behind the JENSA target called SEparator for CApture Reactions (SECAR) is currently under construction. Designed for a mass range of A=15 - 65 it will enhance the number of feasible reaction studies at NSCL and later FRIB. The reaction of 56Ni(α,p)59Cu, important for X-ray bursts and recently measured at NSCL will be presented to show the current capabilities of the JENSA system. In the outlook the status of the upgrade for hydrogen operation will be discussed together with the commissioning runs of the first section of SECAR. |
Monday, April 15, 2019 12:21PM - 12:33PM |
Q13.00007: Simulation and Aberration Corrections of the Super-Enge Splitpole Spectrograph at FSU Kenneth Hanselman, Ingo Wiedenhoever, Gordon McCann, Lagy T Baby, Jessica E Koros, Jon Lighthall, Jeffery C Blackmon, Catherine M Deibel, Ashley A Hood, Erin Good The recent installation and commissioning of the Super-Enge Splitpole Spectrograph (SE-SPS) at Florida State University has enabled the first round of experimental runs using the setup. A crucial pa\ |
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