1 / 9

Personnel

Personnel. NHMF High B/T Facility (Gainesville) Personnel. Jian-Sheng Xia (Associate Leader) Yoonseok Lee (NHMFL Faculty) Carlos Vicente (Postdoc) Mykola Omelaenko (Postdoc) Jill Kirkpatrick (Program Assistant) YT Affiliated Faculty Dwight Adams Gary Ihas

bijan
Télécharger la présentation

Personnel

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Personnel NHMF High B/T Facility (Gainesville) Personnel Jian-Sheng Xia (Associate Leader) Yoonseok Lee (NHMFL Faculty) Carlos Vicente (Postdoc) Mykola Omelaenko (Postdoc) Jill Kirkpatrick (Program Assistant) YT Affiliated Faculty Dwight Adams Gary Ihas Mark Meisel Neil Sullivan

  2. Schematic View of High B/T Facility

  3. Scientific Mission of the Facility Dedicated to high-field experiments which require temperatures lower than 20 mK, the base temperature of the SCM 1 cryostat at he DC Field Facility in Tallahassee. These experiments generally require a quiet environmentand/or a long cooling time. High Field B = 15.3/16.5 T (Will be upgraded to 18/20 T or better in 2005) Homogeneity 1.6x10-5 10 mm DSV < 3x10-3 over 100 mm axial length 2.5 cm-dia experimental space Ultra-Low Temperatures 5 mole PrNi5 (nuclear refrigerant), Tmin < 0.4 mK 8 nW cooling power, t > 6 weeks @ 1 mK Dilution fridge base temperature 8 mK 700 W cooling power @ 100 mK Top & Bottom Loader NHMFL HIGH B/T FACILITYBasic Characteristics

  4. Specialized Instruments High frequency NMR (300 MHz – 1.6 GHz) Ultrasound High sensitivity bridges Vibrating-wire viscometers Sample rotator (–10 to +90, with a liq-3He actuator) rf and dc SQIUDs (Quantum Design) Thermometry Pt NMR (PLM4) T < 20 mK, in the low-field space 3He melting curve thermometer 0.4 mK < T Dilute 3He vibrating-wire thermometer 1.7 mK < T Kapton capacitance thermometer 1.5 mK < T CMN susceptibility thermometer 15 mK < T, in the low-field space 220 Speer resistor (sliced) 15 mK < T, in the low-field space RuO2 resistor (LakeShore sensor, with LR-110 and AVS47) 20 mK < T, in the low-field space NHMFL HIGH B/T FACILITYBasic Characteristics

  5. Rotator sample rotator heat exchanger

  6. Science 2003-2004 Users and Experiments Planned

  7. Upgrading to 20 + Tesla

  8. Budget: $1.2M from the State $25k each for up to three design studies Inhomogeneity: < 2 x 10-5 10 mm DSV < 3 x 10-3 over 100 mm axial length Compensation coils for the demagnetization magnet and the dilution fridge Z0 coil ±10 mT at ± 5 A Max current 150 A. He boil off: 1 l/h (persistent mode) 2 l/h (during ramping) Upgrading to 20 + Tesla 24 in

  9. Publications 2003-2004 Publications, etc. Publications 1. “New Evidence for Zero-Temperature Relaxation in a Spin-Polarized Fermi Liquid”, H. Akimoto, D. Candela, J.S. Xia, W.J. Mullin, E.D. Adams, and N.S. Sullivan, Phys. Rev. Lett. 90, 10531 (2003). 2. “Angular Dependent Measurements of the n = 5/2 Fractional Quantum Hall Effect State at Ultra-low Temperatures”, J.S. Xia, W. Pan, E.D. Adams, N.S. Sullivan, H.L.Stormer, D.C. Tsui, L.N. Pfeiffer, K.W. Baldwin, and K.W. West, Physica E 18, 109 (2003). 3. “A1 and A2 Transitions in Superfluid 3He in 98% Porosity Aerogel”, H.C. Choi, A.J. Gray, C.L. Vicente, J.S. Xia, G. Gervais, W.P. Halperin, N. Mulders, and Y. Lee, Phys. Rev. Lett. 93, 145302 (2004). 4. “Electron Correlation in the Second Landau Level; A Competition Between many, nearly Degenerate Quantum Phases”, W. Pan, J.S. Xia, E.D. Adams, N.S. Sullivan, H.L. Stormer, and D.C. Tsui, L.N. Pfeiffer, K.W. Baldwin, and K.W. West, accepted for publication in PRL (2004). 5. Transverse Acoustic impedance Measurements of the A-B Transition in 3He/Aerogel”, C.L. Vicente, H.C. Choi, J.S. Xia, W.P. Halperin, N. Mulders, and Y. Lee, Submit to PRL (2004). Invited talks 1. “Effect of Strong Magnetic Fields on Superfluid 3He in 98% Porosity Aerogel”, International Symposium on Quantum Fluids and Solids, Trento, July 5-9, 2004 Conference Presentations 1. “Investigation of the A-B Transition in 3He/Aerogel by Transverse Acoustic Impedance Measurements”, International Symposium on Quantum Fluids and Solids, Trento, July 5-9, 2004 2. “New Results of Ultra-low Temperatures in the Second Landau Level in two-dimensional Electron System”, SemMag16, Tallahassee FL, Aug. 4-10, 2004

More Related