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					              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
NUSTAR = Nuclear Structure, Astrophysics and Reactions
         Key-Results from FRS Experiments

                                                                    NP A665 (2000) 221

                                 NP A667 (2000) 75            New Fission Studies

                                  New Mass Measurements


                               PR C65 (2002)064603
                                                                                                      BF=4MeV
          EPJ A14 (2002) 279          100Sn
                                                Bp=0                                                r-process
         2-p Radioactivity                                                                Bn=0
      PRL 86 (2001) 5442
                                                                                 Bound-state b--decay
       Giant Dipole
                                                                                            to be published
       Resonance                                                      Pionic Atoms
NP A720 (2003) 3                                                     PRL 88 (2002) 122301

                                                       78Ni      New Fission Fragments
         8
             B
                                                                     PL B 444 (1998) 32

      Halo                                    Shells far off Stability
      Nuclei
                               11Li     Skin Nuclei
       PRL 91 (2003) 162504
                                        Martin Winkler, DP NUSTAR 14-4-05
Production of Exotic Nuclei at Relativistic Energies


                    Projectile Fragmentation


                                                   Projectile                          EPAX
                                                   Fragment
       Projectile       Target




                                                                cross section (barn)
    Nucleon-Nucleon-Collissions (Abrasion Ablation)

                                               Vf  V p



                    Projectile Fission                                                 129
                                                                                             Xe fragmentation
   Projectile                                                                                      238
                                                                                                       U projectile fission




                                                  Fission
                                 Target           Fragments


      Coulomb Excitation in Peripheral Collisions                                        Fragment Mass Number A
                                                                                                                     K.Sümmerer
                                          Vf  Vp  Vfission




                                               Martin Winkler, DP NUSTAR 14-4-05
      Advantages of Projectile Fragmentation
and – 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
The NUSTAR-Facility at FAIR




           Phase 1
      Martin Winkler, DP NUSTAR 14-4-05
                                                         Design Parameter of the Super-FRS


         Goal:
     Larger Acceptance                                                                   Design Parameters:
                                238              78
                                      U+C             Ni - (Fission)
                        40

                        20
                                                                       Emittance                                  ex = ey   40 p mm mrad
                          0                                            Angle acceptance
                        -20
                                                                                        - Horizontal              jx        ± 40 mrad
                        -40
                              -0.1     -0.05         0    0.05   0.1                    - Vertical                jy        ± 20 mrad
ntation                       238              132
                                    U+C              Sn - (Fission)
                                                                       Momentum acceptance                        p/p      ± 2.5%
                         40

                                                                                                                  Brmax
              / mrad




                         20                                            Maximum magnetic rigidity
                          0
                                                                                       - High -energy branch                20 Tm
                        -20
                                                                                       - Ring branch                        13 Tm
                        -40
                               -0.1    -0.05         0    0.05   0.1                   - Low -energy branch                 10 Tm
                 124                    100
                        Xe + C                Sn - (Fragmentation)
                                                                       Ion -optical resolving power (1st order)   Rion      1500
                        40

                        20

n                         0

                        -20

                        -40
          1500
                              -0.1     -0.05         0    0.05   0.1
                                                p/p

                                                                          Martin Winkler, DP NUSTAR 14-4-05
Design parameters and layout of the Super-FRS




                      • Multi-Stage
                      • Super Conducting
                      • Large-Acceptance
                      • Multi-Branch

               Martin Winkler, DP NUSTAR 14-4-05
Separation performance with two degrader stages
         100 Sn   produced by fragmentation of 124Xe at 1000 MeV/u


              1 stage separator (FRS)
   2 stage separator (Super-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
     List of Tasks: Overview



         Task No
                                    Topic
       (short title)

6      NUSTAR1         High-power production targets

7      NUSTAR2         Radiation-resistant magnets

8      NUSTAR3         Detector development

                       Ion-optical design studies and
9      NUSTAR4
                       application

10     NUSTAR5         Stopping cell dvelopment




            Martin Winkler, DP NUSTAR 14-4-05
         NUSTAR1: High-Power Production Targets
                      (Concept for a Rotating Target Wheel)


                                                                               Target E at PSI
                                            Graphite                Specific
                            Total Beam                  Deposited
                                              Target                 Power
                              Power                      Power
      Facility       Beam                   Thickness                ΔP/M
                             P [kW]                     ΔP [kW]
                                             [g cm-2]               [kW/g]
Super-FRS        all ions      < 38           4- 8        < 12      < 0.15
PSI              P            1000            10.8         54        0.18
RIKEN/BigRIPS    all ions     < 100            1          < 20       0.81
SPIRAL-II        D             200            ~ 0.8       200       ~ 0.25

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
       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
                    NUSTAR2:
    Radiation-Resistant Large-Aperture Magnet


                                            Energy deposition distribution
 Geometry at target area                       (calculated with PHITS)




                                                               <E>/M= 0.46 mJ/g
 Milestones:                                                   (quench limit: 2-3 mJ/g)
• 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
      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
• x, y: position measurements
                                                  lines with inputs connected to the cathode wirdes
• x', y': corresponding angle measurements
                                                - use of adjustable preamplifiers
• E and TOF for particle identification
                                                - work under variable pressure conditions
                                                  (<1mbar – 1bar)
   Milestones:
  • M8-1: High-Flux beam chamber prototype delivered, 8/2007*
                                   Martin Winkler, DP NUSTAR 14-4-05
          NUSTAR4: Ion-Optics & Application
     NUSTAR5: 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
          Participating Laboratories and Institutes
                      in the DP NUSTAR
Participant
                         Organisation                Country     Acronym       Coordinator
 number
              Gesellschaft für Schwerionen-
    1                                                   D             GSI   M. Winkler
              forschung Darmstadt

    7         Justus-Liebig Universität Giessen         D        Giessen    W. Plass

    16        Technische Universität Dresden            D        Dresden    H. Quack

    19        Forschungszentrum Karlsruhe               D             FZK   R. Stieglitz

    20        Philipps Universität Marburg              D             PUM   W. Ensinger
    21        Fachhochschule Mainz                      D             FHM   F. Boochs

    22        Babcock Noell Nuclear (industry)          D             BNN   M. Gehring

    23        Comenius University Bratislava           SK             CUB   B. Sitar

    24        University of Surrey                     GB             UOS   Zs. Podolyak

    33        Jyväskyla Yliopisto Fysiikan laitos      FIN            JYU   J. Äystö

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




                 Martin Winkler, DP NUSTAR 14-4-05
                     Summary of Project Resources and
                        Budget of the DP NUSTAR
                                      Manpower / [PM]        Investment / [k€]      Expected
 Part.                                                                                         Request
            Organisation    Task                                                     budget
Numb.                                Contrib.    EU Requ.   Contrib.       EU Requ.              [k€]
                                                                                      [k€]
                           NUSTAR1         24          24         63             63      462        231
                           NUSTAR2         16          15        277            284      778        389
  1      GSI, Darmstadt    NUSTAR3          6           0              0          0       42          0
                           NUSTAR4          6           0              0          0       42          0
                           NUSTAR5          6           0              0          0       42          0
  7      JLU, Giessen      NUSTAR4         66          36              0         17      432        196
  16     TUD, Dresden      NUSTAR2          3           3              0          0       30         15
  19     FZK, Karlsruhe    NUSTAR1         24          24         70             70      492        246
  20     PUM, Marburg, D   NUSTAR2          9           9              0          0       96         48
  21     FHM, Mainz, D     NUSTAR2         21          18              0          8      209        104
         BNN (Industry
  22                       NUSTAR2         2.5        2.5              0          0       66         33
         partner)
  23     CUB, Bratislava   NUSTAR3         90           0              0         66      334         91
  24     UOS, Surrey       NUSTAR4         12          12              0          0      120         60
  33     Jyväskylä         NUSTAR5         12           0              0         13       67         27

               Total:                  297.5       143.5        410            521     3.212     1.440



                                      Martin Winkler, DP NUSTAR 14-4-05

				
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