High Magnetic Field Facility for Neutron Scattering
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1 High Magnetic Field Facility for Neutron Scattering Project HFM-EXED NHMFL: M. Bird, I. Dixon, J. Toth, S. Bole, S. Hannahs, J. Kynoch, H. Bai, S. Marshall, T. Adkins, G. Boebinger J. Miller, A. Bonito-Oliva EPFL-CRPP: P. Bruzzone, R. Wesche HZB: P. Smeibidl, A. Daske, H. Ehmler, C. Fritsche, J. Heinrich, M. Hoffmann, S. Kempfer, R. Wahle MT-24 Seoul 21. Oct
2 What is Helmholtz? What is HZB? 2
3 What is Helmholtz? What is HZB? HZB Campus Wannsee HZB Campus Adlershof 3
4 Investigation of Structure and Dynamics of Complex Materials and Material Systems with Neutrons Atom Atoms within crystal d Neutron scatters at the lattice Neutrons Detector area Neutron reflection Diffraction picture Nuclei Unit cell Magnetism Beugungswinkel Scattering Angle 4
5 Unconventional Superconductors Understanding the interplay between superconductivity and other competing orders Identification of different vortex phases (lattice, liquid, disentangled, entangled, decoupled) Method: diffraction / inelastic scattering / SANS B/T phase diagram of underdoped YBCO Le Boeuf et. al., Nature Physics 9 (2013) 79 5
6 Magnet Systems for n-scattering at HZB Continuous Field max. ~ 15 T split pair configuration 6
7 Present Cryomagnets for n-scattering Experiments Limitations Sample Sample chamber SANS SC-Magnet Vertical Field Horizontal Field 7
8 High Field Magnets for Neutron Science Monochromatic Triple-Axis Instrument Split-Coil-Magnet (vertical field) Magnetic Structures Single Crystal Measurements Broad Wavelength Band of Neutrons TOF-Instrument Tapered Solenoid (horizontal field) Powder Diffraction Single Crystal Measurements (restrictions!) SANS with B k i Inelastic Measurements Inelastic Measurements (flux reduction!) 8
9 Neutron-Guide-Hall-2 with Multi-Spectral Guide Neutron Guide Hall-I Exp-Hall Neutron Guide Hall-II Cold Source 3x10 7 thermal cold mixed Cold Neutrons Super Mirror Flux (n / s cm 2 A) 2x10 7 1x10 7 Thermal Neutrons Neutron Guide (Ni coated) Wavelength (A) Thermal Neutron Beam Cold Neutron Beam 9
10 Project Preparation Phase TOF instrumentation with multispectral neutron guide and horizontal magnet to allow optimum magnet design Resistive Magnet or Superconducting Magnet or Series-Connected-Hybrid Magnet (SCH) Fermi Chopper 6 Disc Choppers Hybrid data: Max. Field: > 25 Tesla (4 MW) > 30 Tesla (8 MW) (conical opening: 30 ) Multi Purpose Instrument: Diffraction Small Angle Neutron Scattering Spectroscopy Magnet Detector Chamber 10
11 Magnets for n-scattering Experiments Future =30 25 T 31 T Hybrid Magnet (Solenoid) Geometry and power of resistive coil determine maximum field 11
12 Why not a Superconducting Magnet? Plot maintained by Peter Lee at: 12
13 Design Parameter Hybrid Magnet Central Field Bore > 25 T (> 30) T 50 mm horizontal Service Turret Opening Angle 30 Power Resistive Insert 4 MW (8 MW) CICC Coil Field Homogeneity < 0.5% (15 mm x 15 mm Vol.) Operating Current 20 ka Sample Magnetic Field of Resistive Insert Magnetic Field of Supercond. Coil Height Total Weight Cold Mass 13 T 18 T (4 MW / 8 MW) 13 T ~ 5 m ~ 25 t ~ 6 t Resistive Coils HTS in future? 13
14 Simplified Electrical Circuit Coil Protection 14
15 Quench Detection System (Two independent systems)
16 Superconducting Outsert Coil Nb 3 Sn Strand and 3 Types of Superconductor High Field Mid Field Low Field Cable Pattern 4x3x3x3x3=324 5x4x4x3=240 4x4x4x3=192 N sc strands/cu strands 324/0 120/120 64/128 Strand diameter 0.81mm 0.81mm 0.81mm Jc-nocu (12T,4.2K) >2100A/mm2 >2100 A/mm2 >2100 A/mm2 Type of strand : Nb 3 Sn RRP or PIT RRP or PIT RRP or PIT Strand coating Chrome plating Chrome plating Chrome plating Void fraction 29+/-1% 29+/-1% 29+/-1% 16
17 Resistive Insert Coil Horizontal 17
18 Superconducting Outsert Coil Final Assembly 18
19 Superconducting Outsert Coil Final Assembly 19
20 Superconducting Outsert Coil Final Assembly 20
21 Sample Environment Sample 3 He Evaporator 4 He Evaporator Closed Cycle Refrigerator as precooling stage 21
22 Hybrid Magnet + Technical Infrastructure Operation: 400 V / 20 ka DC power supply Helium refrigerator for CICC coil, radiation shields and current leads high pressure, high purity cooling water 4 / 8 MW cooling power for resistive coil 22
23 HZB Neutron Scattering Facilities Technics Building: DC power supply Helium refrigerator cooling water facility Neutron Instrument & HFM HFM Assembly and Test Site in Technics Building 23
24 Infrastructure Building Cooling Towers Helium- Refrigerator Test Load Test Load Compressors Pumps AC-Power Transformers DC-Power Controls Water Treatment Water Cooling Chiller 24
25 Control System Hybrid Magnet Combine Controls for: Magnet + Power Supply + Water Cooling + Helium Refrigerator + Data monitoring and safety procedures User Terminal 25
26 Aug 2015 Commissioning Hybrid Magnet Start of cooldown of superconducting coil 16 Oct 2014 First successful magnet test at 20 ka (26 T) 12 Dec 2014 Relocation of magnet system from HFM technics building to Neutron Guide Hall Jan to Feb Installation of magnet on neutron instrument EXED Start HFM/EXED commissioning 07 Apr 2015 Successful test on instrument 20 ka (26 T) for 3 hours 26
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