Technical Design Report Super Fragment Separator

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Beam from FRS -7 10 mbar MUSIC Scintillator Vacuum Window Monoenergetic Degrader Homogeneous Degrader 3 x Scintillator Movable Slits DRAFT 100 mbar He Helium gas filled stopping cell 252 Cf Source (for Offline Test) -2 10 mbar Extraction- RFQ -5 10 mbar RFQ-Beam Distribution System Cooler- RFQ Silicondetector Ortho-TOF-MS Figure 2.4.119: Schematic figure of the experimental setup of the Ion Catcher experiment behind the FRS. A multi-wire proportional chamber (MWPC) is used for beam tracking and ion rates are measured in a multiple sampling ionisation chamber (MUSIC). The ions are range-focused in the degrader system, consisting of a homogeneous and a monoenergetic degrader. Three scintillators in front of the gas cell are employed to measure the ratio of ions that do not enter the gas cell. Ions are stopped in the gas cell in helium at a pressure of 100 mbar and extracted, separated from the gas in an extraction RFQ, and guided in an RFQ-based beam distribution system alternatively to a silicon detector for counting radioactive ions or a time-of-flight mass spectrometer with orthogonal acceleration (Ortho-TOF-MS) for identification of the ions and extraction time measurement. 2.4.11.3 Production targets Similar to the present SIS18/FRS/ESR facility, both, slow and fast extraction from SIS100/300 will be used at Super-FRS: the former (with typical extraction times of a few seconds) for counter experiments at the experimental caves, the latter for experiments with radioactive secondary beams in the storage rings (here short beam pulses with a length of typically τ ~ 50 ns will be needed). The very high instantaneous power deposited in the target by fast-extracted beams (up to ~ 200 GW) could lead to destruction of the production target [64] by a single beam pulse. It is, therefore, essential to take special care in designing a target for fast extraction. The key parameter for target technology is the specific power deposited by the primary beam and by the fragments produced in the target. Since only ions lighter than the projectile are formed in projectile fragmentation and fission, it is reasonable to consider only the parameters of the incident beams. The optimum target thickness will range from a few g/cm 2 up to about 8 g/cm 2 depending on the atomic number Z of the projectile and the selected energy. Table 2.4.28 lists typical specific energies deposited in graphite chosen as the target material by three benchmark beams, 40 Ar, 136 Xe and 238 U. All beam intensities are taken as 10 12 ions/cycle, and the beam energies are 1 A GeV. The beam spot is assumed to be a two-dimensional Gaussian distribution with σx = 1 mm and σy = 2 mm. 130
DRAFT Table 2.4.28: Typical beam parameters considered for planning production targets at the Super-FRS. Beam Total beam energy E [kJ] Graphite target thickness [g cm -2 ] Deposited Energy ∆E [kJ] Specific Energy ∆E/M [kJ/g] 40 Ar 6.4 8.0 0.83 0.75 136 Xe 21.8 6.0 6.0 7.5 238 U 38.1 4.0 12.0 22 2.4.11.3.1 Target design for slow-extraction In slow extraction mode, the typical extraction time is 1 s, and, consequently, the energy values given in Table 2.4.28 can easily be converted into power with the same numerical values. The maximum beam power of 12 kW deposited by 238 U in the Super-FRS target can be compared to the values found in operating facilities (PSI) or to those considered in planned facilities (RIKEN/BigRIPS and GANIL/SPIRAL-II), see Table 2.4.29. The Super-FRS beam power in slow extraction is lower than in the above-mentioned facilities, and it should, therefore, be possible to use the same target material as chosen for the other facilities, namely graphite. Although graphite has one of the best thermal characteristics, the energy deposited by the uranium beam in a stationary target would lead to very high temperatures of about 20,000 K, which are well above the sublimation point. The solution that has therefore been chosen at PSI, RIKEN and SPIRAL-II involves a rotating-wheel concept, which allows to increases the volume where the energy is deposited. The same concept will be used at the Super-FRS. Table 2.4.29: Typical beam parameters for production targets of existing or planned secondary-beam facilities. All target concepts use rotating wheels and DC beams. For Super-FRS slowly extracted beams of a rate 1 /s were assumed. Specific power values are calculated assuming that targets rotate with 60 rpm. Facility Beam Total Beam Power P [kW] Graphite Target Thickness [g cm -2 ] Deposited Power ∆P [kW] Specific Power ∆P/M [kW/g] PSI P 1000 10.8 54 0.18 RIKEN/BigRIPS SPIRAL-II all ions < 100 1 < 20 0.81 D 200 ~ 0.8 200 ~ 0.25 Super-FRS all ions < 38 1 - 8 < 12 < 0.15 Calculations of an engineering model of the graphite target wheel Concerning the engineering design of the Super-FRS target for slow extraction the solution developed and used at PSI [65] will be followed. A more detailed description of the rotating target wheel has been given in the final report of task 6 of the EU Design Study "DIRACsecondarybeams" [66]. 131
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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
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 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: DRAFT commissioned in February 2005
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
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,
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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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Technical Design Report Super Fragment Separator

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