Technical Design Report Super Fragment Separator

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Engineering design DRAFT Engineering aspects of a potential liquid-metal jet target have been studied in the framework of an EU-funded design study [66], with the goal to find a conceptual design of a suitable liquid-lithium jet and to build a prototype. The basic problems to be addressed are the following ones: 1. Is it possible to form a homogeneous liquid-Li flow with about 7 cm length in beam direction (corresponding to about 3.5 g/cm 2 of Li) and a width of about 1-2 cm? 2. Which technical components are required for the safe operation of a free-flowing jet of liquid lithium? Before starting complicated and time-consuming liquid-metal experiments, first studies with a water jet should define the nozzle shape and some basic operation parameters (even though scaling of the hydrodynamic properties from water to liquid-Li is not possible). After that, liquid-Na experiments allow studying the technical aspects; for this metal long-term experience exists at FZ Karlsruhe. Moreover, a similarity analysis has shown that scaling from Na to Li is possible. As a last step, the technical aspects of operating a liquid-Li loop can be addressed. Therefore, the following strategy has been followed in this part of the Design Study [83]: a) Investigate the jet flow patterns of a water jet as a function of nozzle shape, flow velocity and water-conditioning parameters. b) Develop non-destructive methods to experimentally classify the jet shape, velocity field and surface properties. c) Compare the measured jet properties with those calculated with continuous-fluid dynamics (CFD) calculations. d) Optimize the jet parameters according to b) in numerical CFD models. e) Set up a liquid-Na loop to provide an experimental set-up to determine the properties and operation conditions of a liquid-Na jet. f) Optimize by CFD calculations the jet parameters for liq.Na and compare the predictions to measurements. g) Repeat steps e) and f) for liquid lithium. Up to now, the design study has completed more or less all steps a) to e). For step b) it was necessary to develop novel techniques to scan totally-reflecting surfaces by the Double-Layer Projection (DLP) technique. Figure 2.4.126 shows the liquid-Na loopthat will be used to complete step f) until the end of the design study. During the course of the study it has become clear, however, that the use of liquid lithium poses additional chemical problems, mostly related to reactions of Li with trace elements in the liquid (e.g. N), that have to be solved before the use of a free Li jet can be considered as a practical target at the Super-FRS. 140
DRAFT Figure 2.4.126: Left: Schematic diagram of the liquid-Na loop designed for testing a windowless Na jet. Right: Experimental liquid-Na set-up installed at the FZ Karlsruhe KALLA laboratory [83]. 2.4.11.3.3 Conclusion In summary, we can state that the target design for slow extraction is technically solved and fulfils all the requirements for experiments with exotic nuclei at the Super-FRS. Prototyping and test experiments at the present FRS have already started and will be continued. For fast extracted beams the design of a universal production target is still in progress. However, the rotating graphite wheel, ideally suited for slow-extraction, can also be used for fast extraction at the highest intensities under the condition that the separation power of the Super-FRS and the transmission are reduced. Replacing the graphite wheel by a liquid target, together with an enlarged beam spot at the target, may yield even more favourable conditions for a long-term stable operation with 10 12 of the heaviest ions in 50 ns pulses. Both 3-dimensional hydro-dynamical calculations and experimental investigations on the behaviour of a liquid-metal jet are underway. 141
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DRAFT Technical Design Report Super
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Preface DRAFT The International Fac
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Contents DRAFT 2.4.1 System Design
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DRAFT Table 2.4.1: Parameters of th
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DRAFT degrader stage which provides
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Pre-Separator DRAFT In order to acc
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DRAFT coupling coefficients is give
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DRAFT Table 2.4.3: First-order matr
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DRAFT Main-Separator to the high-en
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DRAFT Table 2.4.5: Transmission T o
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DRAFT Figure 2.4.15: Resolution nec
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DRAFT Figure 2.4.17: Spectrometer m
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DRAFT Table 2.4.8: Design parameter
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DRAFT Figure 2.4.20: Side view of t
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DRAFT Figure 2.4.23: Coil cross-sec
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DRAFT Figure 2.4.25: Flux density d
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Figure 2.4.29: Assembly of two half
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DRAFT Figure 2.4.31: Cross section
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Figure 2.4.34: Sketch of the therma
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DRAFT To fulfill the required field
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DRAFT Figure 2.4.39: The 3D model o
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DRAFT Pole radius mm 100 210 250 25
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DRAFT Figure 2.4.43: Front, side, a
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∆B/B 0.0 DRAFT Figure 2.4.46: Ave
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DRAFT Figure 2.4.50: 3D model of th
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DRAFT Figure 2.4.54 and Table 2.4.1
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DRAFT 2.4.2.3.1 Radiation resistant
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DRAFT The water-cooled radiator con
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DRAFT Table 2.4.17: Coil parameters
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DRAFT Figure 2.4.63: Field distribu
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DRAFT Figure 2.4.65: Multiplet conf
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DRAFT Table 2.4.21 summarizes the r
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2.4.2.6 Current Leads DRAFT The cur
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DRAFT Table 2.4.23 presents the lis
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2.4.3 Power Converters DRAFT The po
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SCR structure DRAFT Regarding high
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a) Chopper circuit 3x400V b) Half b
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External Control System Data transf
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DRAFT Figure 2.4.77: Arrangement of
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SuperFRS Power Supply Effective App
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DRAFT The locations for the differe
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DRAFT Figure 2.4.80: Beam induced f
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DRAFT Figure 2.4.82: Two hybrids ca
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DRAFT Figure 2.4.84: Left panel: TP
Page 89 and 90: DRAFT extracted beams. Its use for
Page 91 and 92: Time of Flight measurement DRAFT At
Page 93 and 94: DRAFT together. Another option is t
Page 95 and 96: DRAFT Figure 2.4.88: Pillow seal po
Page 97 and 98: DRAFT Figure 2.4.90: Setup at the m
Page 99 and 100: DRAFT An overview of the total vacu
Page 101 and 102: 2.4.7.4 Appendix - Technical Drawin
Page 103 and 104: DRAFT Figure 2.4.96: Diagnostic cha
Page 105 and 106: DRAFT Figure 2.4.98: Diagnostic cha
Page 107 and 108: DRAFT Figure 2.4.100: Diagnostic ch
Page 109 and 110: 2.4.8 Particles Sources n/a 2.4.9 E
Page 111 and 112: DRAFT movable, but BC3 must be able
Page 113 and 114: DRAFT Figure 2.4.106: Spot size of
Page 115 and 116: dE/dV [kJ/cm 3 ] 3 2 1 DRAFT includ
Page 117 and 118: 2.4.11.1.4 Design of the beam catch
Page 119 and 120: DRAFT Figure 2.4.110: Calculated eq
Page 121 and 122: DRAFT Figure 2.4.112: Location of b
Page 123 and 124: DRAFT the carbon. Again mainly 7 Be
Page 125 and 126: DRAFT maintenance of the carbon or
Page 127 and 128: DRAFT material) and received the an
Page 129 and 130: DRAFT commissioned in February 2005
Page 131 and 132: DRAFT Table 2.4.28: Typical beam pa
Page 133 and 134: DRAFT Figure 2.4.120: Surface tempe
Page 135 and 136: DRAFT Figure 2.4.123: Schematic lay
Page 137 and 138: DRAFT These results show that the i
Page 139: DRAFT Like in the case of the rotat
Page 143 and 144: DRAFT Figure 2.4.128: Schematic lay
Page 145 and 146: DRAFT Figure 2.4.129: Flow scheme o
Page 147 and 148: DRAFT Since the weight of the cold
Page 149 and 150: DRAFT With the cooling capacity spe
Page 151 and 152: DRAFT Figure 2.4.134: Schematic of
Page 153 and 154: S1 (a) Figure 2.4.136: (a) Zoom of
Page 155 and 156: 2.4.A Appendix DRAFT The appendix o
Page 157 and 158: DRAFT experiment the EXL community
Page 159 and 160: 2.4.A1.3 Slow control and monitorin
Page 161 and 162: DRAFT Figure 2.4.139: Architecture
Page 163 and 164: DRAFT all FAIR accelerators will be
Page 165 and 166: DRAFT source tier are split in two
Page 167 and 168: DRAFT coupled from the ACS which is
Page 169 and 170: DRAFT 2.4.A3.2 Work packages: descr
Page 171 and 172: 2.4.A3.2.4 Instrumentation Measurin
Page 173 and 174: DRAFT this, planning a network layo
Page 175 and 176: DRAFT 2.4.A3.3 Machine characterist
Page 177 and 178: DRAFT installation of RALF was done
Page 179 and 180: DRAFT The double ring synchrotrons,
Page 181 and 182: DRAFT The first refrigerator, Cryo1
Page 183 and 184: DRAFT shield 28874 + 25 g/s 22 bar
Page 185 and 186: LHe storage Helium storage Helium s
Page 187 and 188: Cryo2 Cryo3 CryoST DB 3 DRAFT Compr
Page 189 and 190: DRAFT The cold connection will be m
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DRAFT Measurements planned for each
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DRAFT For magnets with less stringe
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DRAFT The value, parameters, condit
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DRAFT 3. Geometry tests For cryosta
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DRAFT The Quench Heaters Tests has
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DRAFT Figure 2.4.159: Photograph of
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DRAFT The field properties listed i
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DRAFT Figure 2.4.161: Schematic vie
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DRAFT Figure 2.4.162: Scheme of the
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2.4.A6.2.2 Shielding against direct
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DRAFT Figure 2.4.164: Schematic lay
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DRAFT Figure 2.4.165: An iron beam
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DRAFT In a side view the flux of pr
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DRAFT catcher 7 Be, 22 Na and 24 Na
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DRAFT at the FRS (2·10 9 /spill as
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DRAFT [1] H. Geissel et al., Nucl.
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DRAFT [74] A. Fabich and J. Lettry,
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Technical Design Report Super Fragment Separator

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