Technical Design Report Super Fragment Separator

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DRAFT yoke. For the purpose of making fiducial references the outer side of the lamination should have a groove of 20 mm width (±0,02 mm) and 10 mm height which represents to the ideal beam path on the upper and lower yoke. Furthermore three fit drill-hole in the yoke surfaces, representing precisely the intersection point of the path tangents and their direction, and some reference planes, well defined relative to the pole surface, are required. The reproducibility of the position of the upper and lower yoke among each other after disassembling and reassembling must be better than 0.050 mm. Reference planes, fit drill-holes and groove have to be protected against corrosion, but not varnished. Voltage taps are placed along the coil to detect where a possible quench starts and to measure joint resistances. Voltage and current taps are connected to the high voltage socket. The wires of the temperature sensors are connected to the low voltage socket. Accurate support and stable positioning of the superconducting magnets within their cryostats is essential for the machine alignment. High flexural stiffness of the supports is therefore the basic mechanical requirement in order to guarantee that magnets are stable within 0.2 mm under variation of external forces; respectively the position of the cold mass with respect to cryostat fiducials should be reproducible to within 0.2 mm. The cryostat – wherein the magnet must move with - must be capable to be positioned in x, y, z direction independently, and to be corrected for rotation errors of the magnetic field. Three adjustable feet should support the cryostat and should provide a controlled motion in the vertical and horizontal direction. Parameter for the alignment feet are: • Adjustable range in horizontal / vertical direction: ± 20mm; • Setting resolution: 0.05 mm; • Long term stability < 0.1 mm/year; • Maximum loads on alignment feet: to be customised according to arising overall weight of cryostat incl. cold mass etc. The most important tolerances of the quadrupole iron yoke are: parallelism of contact surfaces ±20 µm coordinates of pole profile ±20 µm tolerance of remaining dimensions of lamellas 0.1 mm tolerance of width of reference groove +20 µm / 0 height of burr at the lamellas max. 0.1 mm filling factor of yokes 98% tolerance of weight weight of lamella flatness of stack 0.1 mm maximum twist of stack 0.1 mm maximum height of the bur 0.1 mm 64
2.4.2.6 Current Leads DRAFT The current leads provide the electrical link between the normal conducting cables connected to the power converter at ambient temperature and the superconducting cables connected to the magnets at liquid helium temperature and must therefore operate in the temperature range from 300 K to 4.5 K. The large heat load introduced by the currents leads into the magnet cryostat is attributed to heat conduction down the lead from ambient to liquid helium temperature and ohmic heat generation within the leads. The attempt to minimise both thermal conductivity and electrical resistivity is constrained by the fact that most materials obey the Wiedemann-Franz Law. This results in the existence of a minimum heat leak which is practically independent of material properties, but is determined by the optimum shape of the leads [18]. The magnets of the <strong>Super</strong>-FRS will be powered via vapour-cooled current leads at currents ranging from 170 A up to 300 A. Every magnet will have an individual pair of current leads located on the magnet cryostat. The total numbers of leads required and the correspondent currents are listed in Table 2.4.22 [19]. Table 2.4.22: Number and currents of current leads required for the <strong>Super</strong>-FRS. No. of current lead pairs Current [A] Dipoles (separator) 24 246 Dipoles (Energy Buncher) 4 200 Quadrupoles 68 292 Hexapoles 41 171 Octupoles 36 Vapour-cooled leads are usually designed as high efficiency heat exchangers made of copper or brass. The lower end of the lead, which is directly connected to the low temperature superconductor (LTS), is immersed in liquid helium. The heat conducted down the lead causes evaporation of the helium and the vapour is used as cooling gas for the conductor, see Fig.1. The gas escaping the lead at the warm end is controlled by a valve. Thus the full cooling capacity of the helium can be utilised, not only the latent heat of vaporization but also the change in enthalpy of the gas as it warms up to room temperature. Nowadays there exist standard designs commercially available for vapour-cooled current leads and they can be optimised for different current ratings with a minimum heat leak which is close to the optimum value of 1.1 mW/A per lead. 65
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DRAFT Technical Design Report Super
Page 3 and 4:
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
Page 13 and 14: DRAFT coupling coefficients is give
Page 15 and 16: DRAFT Table 2.4.3: First-order matr
Page 17 and 18: DRAFT Main-Separator to the high-en
Page 19 and 20: DRAFT Table 2.4.5: Transmission T o
Page 21 and 22: DRAFT Figure 2.4.15: Resolution nec
Page 23 and 24: DRAFT Figure 2.4.17: Spectrometer m
Page 25 and 26: DRAFT Table 2.4.8: Design parameter
Page 27 and 28: DRAFT Figure 2.4.20: Side view of t
Page 29 and 30: DRAFT Figure 2.4.23: Coil cross-sec
Page 31 and 32: DRAFT Figure 2.4.25: Flux density d
Page 33 and 34: Figure 2.4.29: Assembly of two half
Page 35 and 36: DRAFT Figure 2.4.31: Cross section
Page 37 and 38: Figure 2.4.34: Sketch of the therma
Page 39 and 40: DRAFT To fulfill the required field
Page 41 and 42: DRAFT Figure 2.4.39: The 3D model o
Page 43 and 44: DRAFT Pole radius mm 100 210 250 25
Page 45 and 46: DRAFT Figure 2.4.43: Front, side, a
Page 47 and 48: ∆B/B 0.0 DRAFT Figure 2.4.46: Ave
Page 49 and 50: DRAFT Figure 2.4.50: 3D model of th
Page 51 and 52: DRAFT Figure 2.4.54 and Table 2.4.1
Page 53 and 54: DRAFT 2.4.2.3.1 Radiation resistant
Page 55 and 56: DRAFT The water-cooled radiator con
Page 57 and 58: DRAFT Table 2.4.17: Coil parameters
Page 59 and 60: DRAFT Figure 2.4.63: Field distribu
Page 61 and 62: DRAFT Figure 2.4.65: Multiplet conf
Page 63: DRAFT Table 2.4.21 summarizes the r
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
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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 2.4.129: 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
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DRAFT Figure 2.4.139: Architecture
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DRAFT all FAIR accelerators will be
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DRAFT source tier are split in two
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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 2.4.165: 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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