Technical Design Report Super Fragment Separator

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DRAFT The distributions of the losses of fragment beams have been calculated with the fragmentation model of ABRABLA [122] and the simulation code for fragment separators Lieschen [123]. Figure 2.4.164 shows the calculated thicknesses of the concrete walls along the Super-FRS. The thicknesses reach from ~7.0 m downstream of the target PF2 down to 6 m at the middle focal plane MF2 of the main separator. In the close vicinity of the target a compact iron shielding will be used to replace the concrete. Further on concrete will be partially replaced by soil taking into account the somewhat larger absorption length. 2.4.A2.2.3 Shielding of magnets behind the target and beam catcher The inevitable nuclear interaction in the target and the beam catcher requires special considerations on the damage of the magnetic elements. In addition also the heating due to radiation is a critical issue for the operation of superconducting magnets. The following magnet sections deserve special investigations: • The first quadrupole behind the target, • The dipole magnets in the 1 st Pre-Separator stage, • The first hexapole magnet behind PF1. The deposited energy in the coils of these magnets is calculated in the following by PHITS [41] simulations. Quadrupole magnets behind the target The radiation field behind the target is mainly caused by the fragments emitted in wide angles outside the acceptance of the Pre-Separator and by light secondary particles like protons and neutrons. Therefore, we have foreseen to install a (40 x 40 x 40) cm 3 iron shielding block in front of the first quadrupole magnet which stops the lighter ions and neutrons. This iron block should have an aperture just small enough to let the intense heavy ions pass. The light particles cannot be completely shielded by this iron block, therefore a detailed investigation was performed with the computer code PHITS [41]. The assumed geometry is depicted in Figure 2.4.165 and the case for 10 12 238 U ions at 1500 MeV/u impinging on a 4 g/cm 2 carbon target is simulated. 212
DRAFT Figure 2.4.165: An iron beam block behind the target wheel shields the subsequent quadrupole magnets Q1 and Q2. Figure 2.4.166 shows the heating of the iron block per incident uranium ion. The total power deposited can reach 2 kW which would exceed the performance of a practical cryogenic system. Critical are the coils of the subsequent magnets especially in case of superconducting magnets. The heating must stay below a quench limit of about 1 mJ/g. In the simulation a pure copper conductor was used because the Nb/Ti part is only a small fraction. A detailed plot of the deposited energy at the entrance of the quadrupole magnets is given in Figure 2.4.167. Note that 1 MeV/cm 3 per incident ion corresponds to 18 mJ/g for 10 12 ions in copper. Figure 2.4.166: Energy deposition per primary 1.5 GeV/u uranium ion impinging on the 4 g/cm2 C target. The primary beam and fragments pass through the gap in the shielding block. 213
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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
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DRAFT extracted beams. Its use for
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Time of Flight measurement DRAFT At
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DRAFT together. Another option is t
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DRAFT Figure 2.4.88: Pillow seal po
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DRAFT Figure 2.4.90: Setup at the m
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DRAFT An overview of the total vacu
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2.4.7.4 Appendix - Technical Drawin
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DRAFT Figure 2.4.96: Diagnostic cha
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DRAFT Figure 2.4.98: Diagnostic cha
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DRAFT Figure 2.4.100: Diagnostic ch
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2.4.8 Particles Sources n/a 2.4.9 E
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DRAFT movable, but BC3 must be able
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DRAFT Figure 2.4.106: Spot size of
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dE/dV [kJ/cm 3 ] 3 2 1 DRAFT includ
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2.4.11.1.4 Design of the beam catch
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DRAFT Figure 2.4.110: Calculated eq
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DRAFT Figure 2.4.112: Location of b
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DRAFT the carbon. Again mainly 7 Be
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DRAFT maintenance of the carbon or
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DRAFT material) and received the an
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DRAFT commissioned in February 2005
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DRAFT Table 2.4.28: Typical beam pa
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DRAFT Figure 2.4.120: Surface tempe
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DRAFT Figure 2.4.123: Schematic lay
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DRAFT These results show that the i
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DRAFT Like in the case of the rotat
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DRAFT Figure 2.4.126: Left: Schemat
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DRAFT Figure 2.4.128: Schematic lay
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DRAFT Figure 2.4.129: Flow scheme o
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DRAFT Since the weight of the cold
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DRAFT With the cooling capacity spe
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DRAFT Figure 2.4.134: Schematic of
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S1 (a) Figure 2.4.136: (a) Zoom of
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2.4.A Appendix DRAFT The appendix o
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DRAFT experiment the EXL community
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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
Page 191 and 192: DRAFT Measurements planned for each
Page 193 and 194: DRAFT For magnets with less stringe
Page 195 and 196: DRAFT The value, parameters, condit
Page 197 and 198: DRAFT 3. Geometry tests For cryosta
Page 199 and 200: DRAFT The Quench Heaters Tests has
Page 201 and 202: DRAFT Figure 2.4.159: Photograph of
Page 203 and 204: DRAFT The field properties listed i
Page 205 and 206: DRAFT Figure 2.4.161: Schematic vie
Page 207 and 208: DRAFT Figure 2.4.162: Scheme of the
Page 209 and 210: 2.4.A6.2.2 Shielding against direct
Page 211: DRAFT Figure 2.4.164: Schematic lay
Page 215 and 216: DRAFT In a side view the flux of pr
Page 217 and 218: DRAFT catcher 7 Be, 22 Na and 24 Na
Page 219 and 220: DRAFT at the FRS (2·10 9 /spill as
Page 221 and 222: DRAFT [1] H. Geissel et al., Nucl.
Page 223 and 224: DRAFT [74] A. Fabich and J. Lettry,
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Technical Design Report Super Fragment Separator

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