Technical Design Report Super Fragment Separator

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DRAFT The slow extraction mode would result in a smaller beam spot but a simple estimate of the heat diffusion time, following refs. [49,50], shows that the thermal diffusion time (tD) can be fast enough to distribute the heat from a smaller volume, tD = σ 2 Cp ρ/(4λ). Here σ is the spot size, the specific heat Cp = 1.83 J.kg -1 .K -1 at 1100 K, density ρ = 1.84 g/cm 3 and the thermal conductivity λ = 70 W.m -1 .K -1 . For σ = 0.5 cm, tD becomes 0.28 s. In case of 1 cm it would be tD = 1.1 s. This means that the temperature will not rise to values higher than in the fast extraction mode with a repetition rate of 1 s. The simulations also show that it is important for a tolerable maximum temperature in the centre to have the cooling water close, but not too close to avoid boiling of the water on the walls of the hot tubes which would drastically reduce the heat transfer. The thermal coupling from the graphite to the aluminium block needs further investigations. A liquid metal layer may be used. The heat transfer to the cooling tubes is increased by turbulent flow in special swirl tubes providing a steady turbulent flow [51]. A prototype must be built and heated with external heat sources. The thermal expansion of the graphite will lead to mechanical stress. The analysis with the ANSYS code shows a maximum deformation in the center of up to 0.1mm. This corresponds to an equivalent von-Mises stress of 10-20 MPa. In the fast extraction mode on top of this value the pressure wave from the instantaneous heating must be added. Together these pressures stay still below a critical limit for cyclic stress of ~ 60 MPa. In the DC mode the mechanical stress stays below the critical limits for a full graphite/aluminium construction. Nevertheless the mounting should be done on a cold side which will not increase the stress too much. A large uncertainty is the additional swelling of the material due to radiation damage. To allow more deformation the graphite block can be divided in an upper and a lower half, cut into many slices. This detailed design work is still in progress. Special care has to be taken about tensile forces such as from rarefaction waves following the initial positive pressure wave. A simulation of the distribution and damping of such waves is ongoing. 118
DRAFT Figure 2.4.110: Calculated equilibrium temperature profile of the beam catcher for an irradiation with a DC beam depositing 23 kW on a spot size of (9 x 4.5) cm 2 up to a depth of 9.1 cm. Cut through the central hot region seen from the front. Iron part After a certain distance in graphite the deposited energy density becomes low enough to use iron as a beam catcher material. For example, after a penetration depth of 20 cm of graphite the deposited energy per volume in the iron drops below 10 MeV/cm 3 per incident ion for a 1500 MeV/u uranium beam, see Figure 2.4.111. For 10 12 ions in one fast spill this causes a temperature rise of at most 0.5 K which corresponds to a pressure rise of smaller than 3 MPa. Most of the energy is deposited in the carbon part but still the total heating of the iron can reach a power of the order of 1 kW. This requires water cooling of the iron as well. 119
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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
Page 67 and 68: DRAFT Table 2.4.23 presents the lis
Page 69 and 70: 2.4.3 Power Converters DRAFT The po
Page 71 and 72: SCR structure DRAFT Regarding high
Page 73 and 74: a) Chopper circuit 3x400V b) Half b
Page 75 and 76: External Control System Data transf
Page 77 and 78: DRAFT Figure 2.4.77: Arrangement of
Page 79 and 80: SuperFRS Power Supply Effective App
Page 81 and 82: DRAFT The locations for the differe
Page 83 and 84: DRAFT Figure 2.4.80: Beam induced f
Page 85 and 86: DRAFT Figure 2.4.82: Two hybrids ca
Page 87 and 88: 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: 2.4.11.1.4 Design of the beam catch
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 and 140: DRAFT Like in the case of the rotat
Page 141 and 142: DRAFT Figure 2.4.126: Left: Schemat
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
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DRAFT 2.4.A3.2 Work packages: descr
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2.4.A3.2.4 Instrumentation Measurin
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DRAFT this, planning a network layo
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DRAFT 2.4.A3.3 Machine characterist
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DRAFT installation of RALF was done
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DRAFT The double ring synchrotrons,
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DRAFT The first refrigerator, Cryo1
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DRAFT shield 28874 + 25 g/s 22 bar
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LHe storage Helium storage Helium s
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Cryo2 Cryo3 CryoST DB 3 DRAFT Compr
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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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