NHMFL-PFF Strategic Plans: Achieving 100 T Chuck Mielke Director of the NHMFL-PFF

Where are we today 85 T Operations user program – World Leading and Unique User Environment – Currently executing our second call of proposals Set World Record for non-destructive high field (89 Tesla) Have the Worlds largest (electrical) Pulsed Power System – 1.4 GVA Has Enabled the Only Reliable Fields > 80T +600 MJ pulse capacity use 140 MJ for the 85 T magnet outsert Have established a world leading competency in Fermi Surface Topology using all NHMFL magnets (especially the 85 T)

Where are we going? 100 T (Operational System Verification) Acceptable risk field for user operations – Based on analysis of mechanics at peak field. (Primarily determined by outsert) 100 T user operations

How? By reducing bore from 15 to 10 mm – Insert delivers 61.3 T by itself – Outsert delivers (37.0 – 3.3) T = 33.7 T Same risk to outsert as current 85 T operations To reach 100 T outsert must deliver 5 T more Assess risk of 42 T outsert field

When? (Major Milestones) 10 mm Insert Cad Design ( Done Aug 2011) 42T outsert Eng. Risk Assessment Nov 30 th mm insert completed by Jan 30 th 2011 Test to 95 T or higher (Mar – Apr 2011) 100 T user operations analysis (June 2011) Upgrade for 100 T user ops … (2012 – 2014) – Upgraded outsert and spares (coils 1-4 of the outsert)

Timeline details Jul Sep JanMar-Apr June Commissioned to 89 T First Call User ops to 85 T Second Call User ops to 85 T Repaired Coils 2 & 3 on Outsert ERA for 42T Outsert Ops ARRA Project Completed 10 mm Tooling Design Complete 10 mm Tooling Complete 10 mm Assembly Complete Test to 95 T + 100T Ops Analysis 100 T User Ops Install & Hi-Pot 10 mm Assembly Feb Aug Nov Oct Dec Scientist Hire EE Hire

100T Users Call #1 Micro-cantilever magnetometry [quantum magnets] Micro-cantilever magnetometry & contactless conductivity [Hg high-T c ] dHvA & contactless conductivity [U-based heavy fermions] Magneto-transport measurements LSCO Quantum Oscillations Micro-cantilever magnetometry Quantum Oscillations in doped pnictides Transport in pnictide superconductor measurement of upper critical fields HTC Contactless Conductivity Sebastian et al. PNAS HTC Contactless Conductivity Singleton et al. PRL

Performance of 100T Magnet Systems