Technical Design Report Super Fragment Separator

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2.4.12 Local Cryogenics 2.4.12.1 Cryogenics for dipole stages DRAFT There are 28 superconducting dipoles units in the Pre- and in the Main-Separator including the three branches (High-Energy-Branch, Low-Energy-Branch, and Ring-Branch) and in the experimental area of the Super-FRS (Magnetic Spectrometer and Energy-Buncher) as well. The superconducting dipole consists of a warm iron yoke and a warm bore. Only the upper and the lower coils are housed in one cryostat. According to the lattice design, always three dipole units of each dipole stage are always grouped together and will be supplied in parallel by one feedbox unit with liquid helium. The flow scheme which is shown in Figure 2.4.129 demonstrates the following cooling concepts. Supercritical helium (5 K, 3.0 bar, pink line in the cryogenic transfer line) is expanded through the mass flow rate control valve, which works also as a J-T valve (FCV J-T) and its discharging pressure is variable between 1.2 bar and 1.5 bar (or even higher) as requested by the magnets. To re-condensate the flash gas produced by the control valve (FCV J-T), the discharging flow (dark blue) will be re-cooled through a heat exchanger in the so called subcooler. The heat exchanger is immersed in a liquid helium bath whose liquid level and temperature are adjusted by two pressure-control valves (PCV): a) one is on the circuit for collecting the return flow (light blue) from the magnet cryostats and b) another is on the circuit for the vapor return (yellow) from the subcooler. The helium flow at the outlet of the subcooler should contain only one-phase liquid helium that allows the helium supply to be equally distributed into three streams in parallel, each feeding one magnet cryostat. The liquid helium is transferred under the discharging pressure to each magnet cryostat via the so called jumper that makes the connection between the feedbox unit (subcooler and cryogenic transfer line) and the magnet cryostats. Liquid helium is fed from the bottom of the coil container in the magnet cryostat and circulated through the flow channels around the coils. The heat load (steady state heat in-leaks, Joule heating of the instrumentation cables, SC wire junctions and AC loss during ramping, etc.) in the magnet cryostat may cause the evaporation of liquid helium. Therefore two-phase helium may be present in the return flow which comes out from the top on the coil container. A small fraction of such flow is used for cooling the resistive current leads whose cold ends are seated in the so called chimney helium vessel (light blue). The rest of the return flow (possibly two-phase helium) from one magnet cryostat merges with the other two streams before it enters into the subcooler. The cooldown of the magnets can be carried out on the base of a group. The cold helium gas is tuned in its flow rate by the cooldown control valve (violet) in a circuit which bypasses the subcooler. The control of the inlet temperature of the cooldown flow is also possible by mixing the cold helium with 300 K warm helium at required flow rates. The flow control valve (FCV) in the warm circuit that connects the helium vessel to the insulated quench gas collection/cooldown/warmup gas return line allows fine-tuning the cooldown flow through individual cold mass at request. Therefore the cooldown speed and the temperature gradient over the individual cold mass structures are controllable with respect to the specification. The warmup of the magnets can be done also on the base of a group by circulating the 300 K helium gas through both the 4 K and 50 K shield loops of the magnet cryostat. 144
DRAFT Figure 2.4.129: Flow scheme of three Super-FRS dipole units and one feedbox unit. The 4 K helium vessel and coil container in each magnet cryostat are protected from the pressure increase in case of possible quenches by their own safety relief valves. Two additional safety valves are necessary, one for the subcooler protection and the other for the 50 K shield circuit protection. When a quench happens in any magnet of one group, the flow control valve (FCV J-T) located at the upstream of the 4 K flow process will be shut off and the two pressure control valves (PCV) at the downstream will be completely opened as the active action of the quench protection logic control. The protection measure is expected to ease the pressure buildup in the helium vessels. Nevertheless, as a passive action of the quench protection the safety relief valve will be opened once its set pressure is exceeded by the pressure peak resulting from the rapid energy dump in the liquid helium. The 50 K to 80 K shield flow is connected in series for three dipole units in one group but in parallel with respect to the main transfer lines and to the other magnet groups. It is tuned in its flow rates by the flow control valve (light green) at the inlet and the on/off valve (DV) at the outlet. Therefore the cooldown / warmup / operation processes and commissioning/ maintenance / service / repairing of each magnet group are independent. Non-return check valves (NV) are used to reduce the potential risk of the thermoacoustic oscillations and the induced large heat in-leaks. Warm valves and piping are necessary for the purging process and the cooling gas return of the current leads. 145
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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
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 and 140: DRAFT Like in the case of the rotat
Page 141 and 142: DRAFT Figure 2.4.126: Left: Schemat
Page 143: DRAFT Figure 2.4.128: Schematic lay
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
Page 191 and 192: DRAFT Measurements planned for each
Page 193 and 194: 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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