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DIRACsecondary Beams Design Project NUSTAR

DIRACsecondary Beams Design Project NUSTAR. Martin Winkler Kick-off meeting EU DS "DIRACsecondary-Beams", April 14-15, 2005, GSI, Darmstadt, Germany. Research Field and Production of Exotic Nuclei The NUSTAR Facility and the Super-FRS List of Tasks for the DP NUSTAR Implementation Plan

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DIRACsecondary Beams Design Project NUSTAR

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  1. DIRACsecondary Beams Design Project NUSTAR Martin Winkler Kick-off meeting EU DS "DIRACsecondary-Beams", April 14-15, 2005, GSI, Darmstadt, Germany • Research Field and Production of Exotic Nuclei • The NUSTAR Facility and the Super-FRS • List of Tasks for the DP NUSTAR • Implementation Plan • Summary of Project Resources and Budget NUSTAR := Nuclear Structure, Astrophysics and Reactions Martin Winkler, DP NUSTAR 14-4-05

  2. NUSTAR = Nuclear Structure, Astrophysics and ReactionsKey-Results from FRS Experiments 8B NP A665 (2000) 221 New Fission Studies NP A667 (2000) 75 New Mass Measurements PR C65 (2002)064603 EPJ A14 (2002) 279 100Sn 2-p Radioactivity PRL 86 (2001) 5442 Bound-state b--decay Giant Dipole Resonance to be published Pionic Atoms PRL 88 (2002) 122301 NP A720 (2003) 3 New Fission Fragments 78Ni PL B 444 (1998) 32 Halo Nuclei Shells far off Stability 11Li Skin Nuclei PRL 91 (2003) 162504 Martin Winkler, DP NUSTAR 14-4-05

  3. Production of Exotic Nuclei at Relativistic Energies Martin Winkler, DP NUSTAR 14-4-05

  4. Advantages of Projectile Fragmentationand – Fission at Relativistic Energies (0.5-1.5 GeV/u) • Chemistry independent separation • Secondary beams of all elements • Fast separation and transport to the experimental devices (less than s) • Providing secondary beams of short-lived isotopes • Kinematical focusing • Efficient injection into separators and storage rings • Full unambiguous Z-identification due to high velocities • Quasi-continuous secondary beams or alternatively short-pulsed beams • Option for beam cocktail of isotopes of similar A/Z Martin Winkler, DP NUSTAR 14-4-05

  5. The NUSTAR-Facility at FAIR Phase 1 Martin Winkler, DP NUSTAR 14-4-05

  6. Design Parameter of the Super-FRS e e p Emittance = 40 mm mrad x y Angle acceptance j - Horizontal ± 40 mrad x j - Vertical ± 20 mrad y D Momentum acceptance ± 2.5% p/p r Maximum magnetic rigidity B max - High - energy branch 2 0 Tm - Ring branch 13 Tm - Low - energy branch 10 Tm st Ion - optical resolving power (1 order) R 1500 ion Goal: Larger Acceptance  Design Parameters: Martin Winkler, DP NUSTAR 14-4-05

  7. Design parameters and layout of the Super-FRS • Multi-Stage • Super Conducting • Large-Acceptance • Multi-Branch Martin Winkler, DP NUSTAR 14-4-05

  8. Separation performance with two degrader stages100 Sn produced by fragmentation of 124Xe at 1000 MeV/u 2 stage separator (Super-FRS) 1 stage separator (FRS) • Introduction of another separation cut in the A-Z plane of the separated • isotopes • Reduction of the contaminants from fragments produced in the first degrader • Optimization of the fragment rate on the detectors in the Main-Separator • Pre- and Main-Separator can ideally be used for secondary reaction studies • if the separation of the Pre-Separator is already sufficient Martin Winkler, DP NUSTAR 14-4-05

  9. List of Tasks: Overview Martin Winkler, DP NUSTAR 14-4-05

  10. NUSTAR1: High-Power Production Targets(Concept for a Rotating Target Wheel) Target E at PSI Key parameters: • radiation cooled • continuous reliable operation (≈ 1 year) • safe handling concepts needed (plug system, vertical access) Milestones: • M6-1: Concept for rotating target wheel, 12/2006* Martin Winkler, DP NUSTAR 14-4-05

  11. NUSTAR1: High-Power Production Targets(Feasibility Study and Prototype Construction of a Liquid Metal Jet) Key parameters for fast extracted beams: • pulse length 50 ns • beam interaction with nominal target thickness • instantaneous power: 12 kJ/50 ns240 GW • small beam spot (x=1mm, y=2mm) • high power density •  windowless liquid-metal jet target • Critical aspects: • Damage due to shock waves? • Thickness and density homogeneity of the jet, re-formation after rupture • Efficiency of removing induced radioactivity from the jet • Safety of operation Milestones: • M6-2: Conceptual Design of liquid-metal jet target, 12/2007* • M6-3: Liquid-metal jet target prototype ready, 12/2007* Martin Winkler, DP NUSTAR 14-4-05

  12. NUSTAR2: Radiation-Resistant Large-Aperture Magnet Energy deposition distribution (calculated with PHITS) Geometry at target area <DE>/M= 0.46 mJ/g (quench limit: 2-3 mJ/g) Milestones: • M7-1: Decision on insulating material, 10/2005* • M7-2: Delivery of model coil, 9/2006* • M7-3: Design and test for Surveying and alignment system ready, 4/2007* • M7-4: Prototype Magnet delivered, 12/2007* Martin Winkler, DP NUSTAR 14-4-05

  13. NUSTAR3: Large-area beam tracking detecors for fast extracted beam • Task: • Measure ion trajectories for p to U • High intensities • large amount of deposited charge • Short beam pulses • Proposed Solution: • Devoloping of a Beam Chamber Detector • chamber readout consists of integrated delay • lines with inputs connected to the cathode wirdes • use of adjustable preamplifiers • work under variable pressure conditions • (<1mbar – 1bar) • x, y: position measurements • x', y': corresponding angle measurements • DE and TOF for particle identification Milestones: • M8-1: High-Flux beam chamber prototype delivered, 8/2007* Martin Winkler, DP NUSTAR 14-4-05

  14. NUSTAR4: Ion-Optics & ApplicationNUSTAR5: Superfluid-Helium Stopping Cell Experiments with Low-Energy and Stopped Beams Milestones: • M9-1: Beam-distribution prototype delivered to GSI, 8/2007* • M10-1: Key parameters of stopping cell defined, 1/2006* Martin Winkler, DP NUSTAR 14-4-05

  15. Participating Laboratories and Institutes in the DP NUSTAR Martin Winkler, DP NUSTAR 14-4-05

  16. Multi-annual implementation plan of the DP NUSTAR Martin Winkler, DP NUSTAR 14-4-05

  17. Summary of Project Resources and Budget of the DP NUSTAR Martin Winkler, DP NUSTAR 14-4-05

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