Super Fragment Separator (Super-FRS) Machine and Magnets H. Leibrock, GSI Darmstadt Review on Cryogenics, February 27th, 2012, GSI Darmstadt

Layout of the Super-FRS Ion-optical Design Parameters 2 Stage in flight separator Multi-Branch Large acceptance → Large aperture → Superconducting magnets

Comparison of FRS with Super-FRS, intensity gain FRS Super-FRS

Superferric Dipoles for the Pre-Separator Number of dipoles3 Dipole fieldT Bending angleDegree11.0 Curvature radius, Rm12.5 Effective length, L effe. mm2400 Good field regionmm  190 Pole gap heightmm170 Integral field quality (rel.)  3  Total weight: ~56 t H-Type, straight magnet, warm bore, laminated warm iron, sector shape, one pair of current leads per magnet

Superferric Dipoles for the Main Separator Number of main dipoles21 Dipole fieldT Bending angleDegree9.75 Curvature radius, Rm12.5 Effective length, L effe. mm2127 Good field regionmm  190 Pole gap heightmm170 Integral field quality (rel.)  3  Prototype fabrication by FCG Inst. of Modern Phys. Lanzhou, Inst. of El. Eng. Beijing, Inst. of Plasma Phys. Hefei Total weight: ~50 t

Prototype Prototype made by FAIR China Group Inst. of El. Eng., Beijing: conceptual design Inst. of Plasma Phys., Hefei: cryostat and coil Inst. of Modern Phys. Lanzhou: yoke and test IEE, Beijing IPP, Hefei IMP, Lanzhou

Wire and coil case Operating current230A Number of turns 28  20=560 Turn Section size of coil 52.1  48.8 mm LHe capacity25Liter Weight of coil and cryostat 1744Kg the cross section of coils and cryostat Superconducting strandsNbTi (Oxford) Dimension of conductor 1.43  2.23 mm 2 Filament diameter d f 66  m Number of Sc filaments55 Ratio of Cu and NbTi10 RRR of Cu in core wire133

prototype coil and cryostat H-Type, straight magnet => easy to wind racetrack coils maximum flux density at coil: 1.3 T Jc(4.2 K, 5 T)measured = 2880 A/mm2 => the temperature margin is about 3.3 K 14 support links (G10) weight of cold mass: about 1 t prototype coil tested in Hefei

Test of Superferric IMP Measurement (cold test) Magnetic flux: B gap = 1.6 I = 232 A (design value: I = 230 A) Required field quality:  B/B =  3  (over  190 mm, 5 mm steps) field quality tests successful quench tests successful calculated: maximum hot spot ~100K, maximum coil to ground voltage ~300V stored energy ≈ 400 kJ inductance ≈ 15 H heat 4.2 K: W (0-232A)

10 Ramping tests Triangular cycling charging of the dipole (t ramp = 120 s, I max = 232 A) Single triangular cycling charging of the dipole (t ramp = 120 s, I max = 278 A)

11 Superferric Multiplets for the Super-FRS Quadrupol triplet + up to 3 sextupoles Octupole coils in short quadrupoles warm beam pipe (38 cm inner diameter) iron dominated, cold iron (up to 37 tons) common helium bath (~1500 liter helium) per magnet 1 pair of current leads max. current <300A for all magnets 7 short Multiplets with 2 magnets (2.6 m) 20 standard Multiplets (7 m) 3 special Multiplets with 2-3 long quadrupols one special Multiplet with two quadrupoles

Parameters The main requirements of the main multiplet-magnets 13 vertical steering magnets (0.2 Tesla, 0.5 m) 1 horizontal steering magnets (0.2 Tesla, 0.5 m)

Configurations with multiplet magnets 33 Cryostats. 15 different types of configuration

3d Opera model of the quadrupole The quadrupole with main coils and the octupole coils The main parameters of the magnet are: Yoke diameter: 1400 mm Pole tip radius: 250 mm Main coil: Coil cross section: 55×50mm 2 Maximum current density: 127 A/mm 2 Pole tip field: 2.5 T max. coil: 4.5 T Mass of short quads: ~8 tons Mass of long quads: ~12 tons field r=190 mm

3d Opera model of sextupole and steering dipole The main parameters of the sextupole: Yoke diameter: 840 mm Pole tip radius: 235 mm Coil cross section: 23×23 mm 2 Maximum current density: 132 A/mm 2 Gradient range: 4-40 T/m 2 Maximum field at pole/coil: 1.1 T / 2.2 T steering dipoleunitsValue Number of steering dipoles14 Maximum fieldT0.2 Lengthm0.5 Useable horizontal aperturem±0.19 Useable vertical aperturem±0.19

16 Standard Multiplet Overall mass >50 tons Cold mass ~37 tons 5 (*2) voltage taps for quench detection and current leads protection for each magnet Up to 9 pairs of current leads vapor cooled planned conduction cooled?

17 Standard Multiplet Overall mass ~50 tons Cold mass ~37 tons E (long quad) : 0.9 MJ L = 21.2 H I max = 292 A E (short quad) : 0.6 MJ L = 14.1 H I max = 292 A E (sextupole) : MJ L = 1.8 H I max = 171 A >20 temperature sensors liquid level sensor 5 (*2) voltage taps for quench detection and current leads protection for each magnet <1500 liter of LHe Up to 9 pairs of current leads vapor cooled planned conduction cooled?

conclusion Multiplets: 31 Multiplets (+ 2 spare Multiplets). Magnet departments of GSI are preparing specification of superferric Multiplets based on principles of Toshiba's conceptual design study. Documents for procurement will be ready First Multiplet: 2015 (estimation) Last Multiplet: 2019 (estimation) Dipoles: 24 dipoles Prototype built and tested Only very small modifications are required for the series France (CEA, Saclay) and Spain (CIEMAT, Madrid) are interested in superferric dipoles as contribution in kind. First dipole: 2014