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Dr Ian Bradley

Dr Ian Bradley

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A29 Physics Building
Lancaster University
Bailrigg
Lancaster
United Kingdom
LA1 4YB

+44 (0)1524 593074

Research Interests

I am a member of the Lancaster Ultra-Low Temperature Group. My research interests are in the properties of matter at ultra-low temperatures, temperatures below a few thousands of a degree above absolute zero, and the obtaining of such low temperatures. Most of my time is spent investigating the superfluid properties of liquid 3He, the spin 1/2 isotope of helium. The exotic and complex superfluid phases of 3He are only accessible below ~3 millikelvin.

We routinely cool liquid 3He to temperatures of 100 microkelvin and dilute 3He-4He mixtures to below 3 millikelvin. My work is centred around a purpose built 2mK dilution refrigerator which, using additional adiabatic cooling techniques, can produce liquid 3He temperatures as low as 110 microkelvin. All our ULT apparatus is designed and constructed here in Lancaster. I have over 30-years personal experience of building and using dilution refrigerators.

Recent interests include investigating quantum turbulence produced by vibrating objects in superfluid 3He. Quantum turbulence is an ideal system for studying turbulence. In general, turbulence is still rather poorly understood, despite its significance and importance on all length scales. In superfluid 3He at very low temperatures, we can study turbulence in the pure inviscid superfluid without the complication of viscosity. An additional advantage is that the vortex lines all have the same magnitude of circulation - a fundamental property of a quantum fluid - adding a further simplification compared to the vortex lines in a classical fluid. We recently directly measured the energy released by the decay of turbulence at temperatures approaching T=0 by thermal means - the first time this turbulence dissipation energy had been measured in any fluid.

We are also studying the layers of solid 3He that form on the surfaces of any solid at low temperatures, in particular the solid on the strands of aerogel, by thermal and NMR techniques. We found that the solid is very strongly coupled to the surrounding liquid. The paramagnetic nature of the solid spins allowed us to use the solid as in refrigerant. Liquid 3He temperatures below 80 microkelvin were produced in this way.

We showed, for the first time, that superfluid 3He could be used as a particle detector, detecting individual neutron and gamma ray interactions in a small box of superfluid 3He at ~110 microkelvin. This technique may have applications to the detection of Dark Matter (Wimps) due to the very small excitation energy of the superfluid. This work has since been taken forward by another group funded by the EU.

Repetitive creation of single vortices by a vibrating wire in non-rotating superfluid 3He-B has been observed leading to spectacular features on the velocity-force characteristic of the vibrating wire. At certain critical velocities, plateaus are observed. Rapid fluctuations in the wire velocity occur on these plateaus which we ascribe to the production of single vortex loops. The enigmatic feature of these effects is that there appears to be not only a critical velocity for creation but also a critical velocity associated with the decoupling of the vortex from the wire - a model that others have since comfirmed by computer simulations.

Teaching

I have been involved in all aspects of physics teaching. I have taught courses on introductory astronomy and astrophysics, electromagnetism, thermodynamics, low temperature physics and quantum mechanics. Also, as part of the Department's novel Universe as an Art course for non-science students, I have given descriptive lectures on introductory astronomy.

I am Director of the Dame Kathleen Ollerenshaw Observatory. In this role, I manage the equipment in the observatory and supervise undergraduate student projects on observational astronomy. When time permits, I also observe using the observatory, or with my personal telescope. Several ideas for undergraduate projects have been trialled in this way.

Other Interests and Hobbies

My main non-academic interest outside of my family are mountaineering, in particular rock climbing, ice climbing and mountain walking and astrophotography. I am a keen member of the Preston Mountaineering Club, Kendal Mountaineering Club and the Eddington Astronomical Society of Kendal. From mountaineering, I developed an interest in rocks and the effect of the local geology on the landscape. I particularly like visiting regions of the world with interesting (and active!) geology e.g. volcanic and glacial regions.

Ian Bradley's Publications

2014

Stability of flow and the transition to turbulence around a quartz tuning fork in superfluid He-4 at very low temperatures

Bradley, D. I., Fear, M. J., Fisher, S., Guenault, A. M., Haley, R. P., Lawson, C. R., Pickett, G. R., Schanen, R., Tsepelin, V. & Wheatland, L. A. 9/06/2014 In : Physical Review B. 89, 21, 9 p.214503

Research output: Contribution to journalJournal article

Anomalous damping of a low frequency vibrating wire in superfluid He-3-B due to vortex shielding

Bradley, D. I., Fear, M. J., Fisher, S., Guenault, A. M., Haley, R. P., Lawson, C. R., Pickett, G. R., Schanen, R. & Tsepelin, V. 04/2014 In : Journal of Low Temperature Physics. 175, 1-2, p. 372-378 7 p.

Research output: Contribution to journalJournal article

Hysteresis, switching and anomalous behaviour of a quartz tuning fork in superfluid 4He

Bradley, I., Fear, M., Fisher, S., Guénault, T., Haley, R., Lawson, C., Pickett, G., Schanen, R., Tsepelin, V. & Wheatland, L. 04/2014 In : Journal of Low Temperature Physics. 175, 1-2, p. 379-384 6 p.

Research output: Contribution to journalJournal article

Plastic properties of solid 4He probed by a moving wire: viscoelastic and stochastic behavior under high stress

Ahlstrom, S., Bradley, I., Clovecko, M., Fisher, S., Guénault, T., Guise, E. A., Haley, R., Kumar, M., McClintock, P. V. E., Pickett, G., Polturak, E., Poole, M., Todoshchenko, I. A., Tsepelin, V. & Woods, A. 04/2014 In : Journal of Low Temperature Physics. 175, 1-2, p. 147-153 7 p.

Research output: Contribution to journalJournal article

Response of a mechanical oscillator in solid 4He

Ahlstrom, S., Bradley, I., Clovecko, M., Guénault, T., Guise, E. A., Haley, R., Kolosov, O., Kumar, M., McClintock, P. V. E., Pickett, G., Polturak, E., Poole, M., Todoshchenko, I. A., Tsepelin, V. & Woods, A. 04/2014 In : Journal of Low Temperature Physics. 175, 1-2, p. 140-146 7 p.

Research output: Contribution to journalJournal article

2013

The Onset of Vortex Production by a Vibrating Wire in Superfluid He-3-B

Bradley, D. I., Fisher, S. N., Ganshin, A., Guénault, A. M., Haley, R. P., Jackson, M. J., Pickett, G. R. & Tsepelin, V. 06/2013 In : Journal of Low Temperature Physics. 171, 5-6, p. 582-588 7 p.

Research output: Contribution to journalJournal article

Thermometry in Normal Liquid He-3 Using a Quartz Tuning Fork Viscometer

Bradley, D. I., Clovecko, M., Fisher, S. N., Garg, D., Guénault, A. M., Guise, E., Haley, R. P., Pickett, G. R., Poole, M. & Tsepelin, V. 06/2013 In : Journal of Low Temperature Physics. 171, 5-6, p. 750-756 7 p.

Research output: Contribution to journalJournal article

2012

Crossover from hydrodynamic to acoustic drag on quartz tuning forks in normal and superfluid 4He

Bradley, D. I., Clovecko, M., Fisher, S., Deepak, D., Guise, E., Haley, R., Kolosov, O., Pickett, G., Tsepelin, V., Schmoranzer, D. & Skrbek, L. 6/01/2012 In : Physical Review B. 85, 1, p. - 9 p.014501

Research output: Contribution to journalJournal article

2011

A New Device for Studying Low or Zero Frequency Mechanical Motion at Very Low Temperatures

Bradley, I., Clovecko, M., Fear, M., Fisher, S., Guénault, A. M., Haley, R., Lawson, C., Pickett, G., Schanen, R., Tsepelin, V. & Williams, P. 11/2011 In : Journal of Low Temperature Physics. 165, 3-4, p. 114-131 17 p.

Research output: Contribution to journalJournal article

Direct measurement of the energy dissipated by quantum turbulence

Bradley, I., Fisher, S., Guénault, A. M., Haley, R., Pickett, G., Potts, D. & Tsepelin, V. 06/2011 In : Nature Physics. 7, 6, p. 473-476

Research output: Contribution to journalJournal article

History Dependence of Turbulence Generated by a Vibrating Wire in Superfluid (4)He at 1.5 K

Bradley, I., Guénault, A. M., Fisher, S., Haley, R., Jackson, M., Nye, D., O'Shea, K., Pickett, G. & Tsepelin, V. 02/2011 In : Journal of Low Temperature Physics. 162, 3-4, p. 375-382

Research output: Contribution to journalJournal article

2010

Measuring the Prong Velocity of Quartz Tuning Forks Used to Probe Quantum Fluids

Bradley, I., Crookston, P., Fear, M., Fisher, S., Foulds, G., Garg, D., Guénault, A. M., Guise, E. A., Haley, R., Kolosov, O., Pickett, G., Schanen, R. & Tsepelin, V. 12/2010 In : Journal of Low Temperature Physics. 161, 5-6, p. 536-547

Research output: Contribution to journalJournal article

Magnetic phase transition in a nanonetwork of solid (3)He in aerogel

Bradley, I., Fisher, S., Guénault, A. M., Haley, R., Mulders, N., Pickett, G., Potts, D., Skyba, P., Smith, J., Tsepelin, V. & Whitehead, R. C. V. 09/2010 In : Physical Review Letters. 105, 12, 125303

Research output: Contribution to journalJournal article

Generation, evolution, and decay of pure quantum turbulence: a full Biot-Savart simulation

Fujiyama, S., Mitani, A., Tsubota, M., Bradley, D. I., Fisher, S. N., Guénault, A. M., Haley, R. P., Pickett, G. R. & Tsepelin, V. 1/05/2010 In : Physical Review B. 81, 18, p. - 4 p.180512

Research output: Contribution to journalJournal article

2009

The damping of a quartz tuning fork in superfluid He-3-B at low temperatures

Bradley, D. I., Crookston, P., Fisher, S. N., Ganshin, A., Guénault, A. M., Haley, R. P., Jackson, M. J., Pickett, G. R., Schanen, R. & Tsepelin, V. 12/2009 In : Journal of Low Temperature Physics. 157, 5-6, p. 476-501 26 p.

Research output: Contribution to journalJournal article

Transition to turbulence for a quartz tuning fork in superfluid He-4

Bradley, D. I., Fear, M. J., Fisher, S. N., Guénault, A. M., Haley, R. P., Lawson, C. R., McClintock, P. V. E., Pickett, G. R., Schanen, R., Tsepelin, V. & Wheatland, L. A. 09/2009 In : Journal of Low Temperature Physics. 156, 3-6, p. 116-131 16 p.

Research output: Contribution to journalJournal article

The Transition to Turbulent Drag for a Cylinder Oscillating in Superfluid He-4 : A Comparison of Quantum and Classical Behavior.

Bradley, D. I., Fisher, S. N., Guénault, A. M., Haley, R. P., Tsepelin, V., Pickett, G. R. & Zaki, K. L. 02/2009 In : Journal of Low Temperature Physics. 154, 3-4, p. 97-116 20 p.

Research output: Contribution to journalJournal article

2008

The Annihilation of Two Phase Interfaces in Superfluid He-3: Simulated Brane Annihilation in the Laboratory.

Bradley, D. I., Fisher, S. N., Guénault, A. M., Haley, R. P., Kopu, J., Martin, H., Pickett, G. R., Roberts, J. E. & Tsepelin, V. 11/2008 In : Journal of the Physical Society of Japan. 77, 11, p. 111005

Research output: Contribution to journalJournal article

Probing Andreev reflection in superfluid He-3-B using a quartz tuning fork.

Bradley, I., Clovecko, M., Gazo, E. & Skyba, P. 09/2008 In : Journal of Low Temperature Physics. 152, 5-6, p. 147-155 9 p.

Research output: Contribution to journalJournal article

Annihilation of an AB/BA interface pair in superfluid helium-3 as a simulation of cosmological brane interaction.

Bradley, D. I., Fisher, S. N., Guénault, A. M., Haley, R. P., Kopu, J., Martin, H., Pickett, G. R., Roberts, J. E. & Tsepelin, V. 28/08/2008 In : Philosophical Transactions A: Mathematical, Physical and Engineering Sciences . 366, 1877, p. 2803-2812 10 p.

Research output: Contribution to journalJournal article

Fluctuations and correlations of pure quantum turbulence in superfluid He-3_B.

Bradley, D. I., Fisher, S. N., Guénault, A. M., Haley, R. P., O'Sullivan, S., Pickett, G. R. & Tsepelin, V. 8/08/2008 In : Physical Review Letters. 101, 6, p. 065302

Research output: Contribution to journalJournal article

Grid turbulence in superfluid He-3-B at low temperatures.

Bradley, D. I., Fisher, S. N., Guénault, A. M., Haley, R. P., Holmes, M., O'Sullivan, S., Pickett, G. R. & Tsepelin, V. 02/2008 In : Journal of Low Temperature Physics. 150, 3-4, p. 364-372 9 p.

Research output: Contribution to journalJournal article

Magnetic distortion of the B-like phase of superfluid He-3 confined in aerogel.

Bradley, D. I., Fisher, S. N., Guénault, A. M., Haley, R. P., Pickett, G. R., Roberts, J. E., O'Sullivan, S. & Tsepelin, V. 02/2008 In : Journal of Low Temperature Physics. 150, 3-4, p. 445-452 8 p.

Research output: Contribution to journalJournal article

Relic topological defects from brane annihilation simulated in superfluid He-3.

Bradley, D. I., Fisher, S. N., Guénault, A. M., Haley, R. P., Kopu, J., Martin, H., Pickett, G. R., Roberts, J. E. & Tsepelin, V. 01/2008 In : Nature Physics. 4, 1, p. 46-49 4 p.

Research output: Contribution to journalJournal article

2007

Non-linear mechanical response of the a-like phase of superfluid He-3 in aerogel.

Bradley, D. I., Fisher, S. N., Guénault, A. M., Haley, R. P., Pickett, G. R., Roberts, J. E., O'Sullivan, S. & Tsepelin, V. 09/2007 In : Journal of Low Temperature Physics. 148, 5-6, p. 603-607 5 p.

Research output: Contribution to journalJournal article

The AB interface in superfluid He-3 as a simulated cosmological brane.

Bradley, I., Fisher, S. N., Guénault, A. M., Haley, R. P., Kopu, J., Martin, H., Pickett, G. R., Roberts, J. E. & Tsepelin, V. 09/2007 In : Journal of Low Temperature Physics. 148, 5-6, p. 465-473 9 p.

Research output: Contribution to journalJournal article

Vortex rings in superfluid He-3-B at low temperatures.

Bradley, D. I., Fisher, S. N., Guénault, A. M., Haley, R. P., Matthews, C. J., Pickett, G. R., Roberts, J. E., O'Sullivan, S. & Tsepelin, V. 08/2007 In : Journal of Low Temperature Physics. 148, 3-4, p. 235-243 9 p.

Research output: Contribution to journalJournal article

Contrasting mechanical anisotropies of the superfluid He-3 phases in aerogel.

Bradley, D. I., Fisher, S. N., Guénault, A. M., Haley, R. P., Mulders, N., O'Sullivan, S., Pickett, G. R., Roberts, J. E. & Tsepelin, V. 02/2007 In : Physical Review Letters. 98, 7, p. 075302

Research output: Contribution to journalJournal article

2006

Decay of quantum turbulence generated by a vibrating grid at low temperatures in superfluid He-3-B.

Bradley, D. I., Fisher, S. N., Guénault, A. M., Haley, R. P., Matthews, C. J., Pickett, G. R., Tsepelin, V. & Zaki, K. 7/09/2006 In : AIP Conference Proceedings. 850, p. 175-176 2 p.

Research output: Contribution to journalJournal article

The generation of quantum turbulence in He-3-B by a vibrating grid at low temperatures.

Bradley, D. I., Fisher, S. N., Guénault, A. M., Haley, R. P., Matthews, C. J., Pickett, G. R., Tsepelin, V. & Zaki, K. 7/09/2006 In : AIP Conference Proceedings. 850, p. 173-174 2 p.

Research output: Contribution to journalJournal article

The thermal boundary resistance of the superfluid He-3 A-B phase interface in the low temperature limit.

Bradley, D. I., Fisher, S. N., Guénault, A. M., Haley, R. P., Martin, H., Pickett, G. R., Roberts, J. E. & Tsepelin, V. 7/09/2006 In : AIP Conference Proceedings. 850, p. 87-88 2 p.

Research output: Contribution to journalJournal article

Thermal transport by ballistic quasiparticles in superfluid He-3-B in the low temperature limit.

Bradley, D. I., Fisher, S. N., Guénault, A. M., Haley, R. P., Martin, H., Pickett, G. R., Roberts, J. E. & Tsepelin, V. 7/09/2006 In : AIP Conference Proceedings. 850, p. 93-94 2 p.

Research output: Contribution to journalJournal article

Decay of pure quantum turbulence in superfluid He-3-B.

Bradley, D. I., Clubb, D. O., Fisher, S. N., Guénault, A. M., Haley, R. P., Matthews, C. J., Pickett, G. R., Tsepelin, V. & Zaki, K. 23/01/2006 In : Physical Review Letters. 96, 3, p. 035301

Research output: Contribution to journalJournal article

A levitated droplet of superfluid He-3-B entirely surrounded by He-3-A.

Bradley, D. I., Fisher, S. N., Guénault, A. M., Haley, R. P., Martin, H., Pickett, G. R., Roberts, J. E. & Tsepelin, V. 2006 In : AIP Conference Proceedings. 850, p. 95-96 2 p.

Research output: Contribution to journalJournal article

Coupling between solid He-3 on aerogel and superfluid He-3 in the low temperature limit.

Bradley, D. I., Fisher, S. N., Guénault, A. M., Haley, R. P., Pickett, G. R., Skyba, P., Tsepelin, V. & Whitehead, R. C. V. 2006 In : AIP Conference Proceedings. 850, p. 243-244 2 p.

Research output: Contribution to journalJournal article

2005

Emission of discrete vortex rings by a vibrating grid in superfluid He-3-B : a precursor to quantum turbulence.

Bradley, D. I., Clubb, D. O., Fisher, S. N., Guénault, A. M., Haley, R. P., Matthews, C. J., Pickett, G. R., Tsepelin, V. & Zaki, K. 13/07/2005 In : Physical Review Letters. 95, 3, p. 035302

Research output: Contribution to journalJournal article

The dynamic texture of superfluid He-3-B at very low temperatures and in high magnetic fields.

Bradley, D. I., Fisher, S. N., Guénault, A. M., Haley, R. P., Martin, H. & Pickett, G. R. 02/2005 In : Journal of Low Temperature Physics. 138, 3-4, p. 583-588 6 p.

Research output: Contribution to journalJournal article

Turbulence generated by vibrating wire resonators in superfluid He-4 at low temperatures.

Bradley, D. I., Clubb, D. O., Fisher, S. N., Guénault, A. M., Haley, R. P., Matthews, C. J., Pickett, G. R. & Zaki, K. L. 02/2005 In : Journal of Low Temperature Physics. 138, 3-4, p. 493-498 6 p.

Research output: Contribution to journalJournal article

Preliminary measurements on coupling between superfluid He-3 and Kapton or aerogel in the low temperature limit.

Bradley, D. I., Fisher, S. N., Guénault, A. M., Haley, R. P., Mulders, N., Pickett, G. R., Skyba, P. & Whitehead, R. C. V. 01/2005 In : Journal of Low Temperature Physics. 138, 1-2, p. 129-134 6 p.

Research output: Contribution to journalJournal article

The thermal damping of an aerogel resonator in superfluid He-3-B at ultra low temperatures.

Bradley, D. I., Fisher, S. N., Guénault, A. M., Matthews, C. J., Skyba, P., Pickett, G. R. & Zaki, K. L. 01/2005 In : Journal of Low Temperature Physics. 138, 1-2, p. 123-128 6 p.

Research output: Contribution to journalJournal article

2004

Quantum turbulence in superfluid He-3 illuminated by a beam of quasiparticle excitations.

Bradley, D. I., Fisher, S. N., Guénault, A. M., Lowe, M. R., Pickett, G. R., Rahm, A. & Whitehead, R. C. V. 12/2004 In : Physical Review Letters. 93, 23, p. 235302

Research output: Contribution to journalJournal article

Superfluid He-3 in the zero-temperature limit.

Bradley, D. I., Fisher, S. N., Guénault, A. M., Haley, R. P. & Pickett, G. R. 06/2004 In : Journal of Low Temperature Physics. 135, 5-6, p. 385-397 13 p.

Research output: Contribution to journalJournal article

Phonon excitation of quasiparticles in niobium and tantalum superconducting tunnel junction photon detectors.

Wigmore, J. K., Boyd, P., Steele, A. C., Kozorezov, A. G. & Bradley, D. I. 11/03/2004 In : Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 520, 1-3, p. 263-266 4 p.

Research output: Contribution to journalJournal article

Spatial manipulation of the persistent precessing spin domain in superfluid He-3-B.

Bradley, D. I., Clubb, D. O., Fisher, S. N., Guénault, A. M., Matthews, C. J., Pickett, G. R. & Skyba, P. 01/2004 In : Journal of Low Temperature Physics. 134, 1-2, p. 351-356 6 p.

Research output: Contribution to journalJournal article

The response of a mechanical oscillator at the superfluid He-3 AB interface.

Bartkowiak, M., Bradley, D. I., Fisher, S. N., Guénault, A. M., Haley, R. P. & Pickett, G. R. 01/2004 In : Journal of Low Temperature Physics. 134, 1-2, p. 345-350 6 p.

Research output: Contribution to journalJournal article

The stability of the superfluid He-3 AB interface pinned in an aperture.

Bartkowiak, M., Bradley, D. I., Fisher, S. N., Guénault, A. M., Haley, R. P., Pickett, G. R. & Skyba, P. 01/2004 In : Journal of Low Temperature Physics. 134, 1-2, p. 387-392 6 p.

Research output: Contribution to journalJournal article

Vortex generation in superfluid He-3 by a vibrating grid.

Bradley, D. I., Clubb, D. O., Fisher, S. N., Guénault, A. M., Matthews, C. J. & Pickett, G. R. 01/2004 In : Journal of Low Temperature Physics. 134, 1-2, p. 381-386 6 p.

Research output: Contribution to journalJournal article

Characterisation of Ta STJ photon detectors using phonon pulses at mK temperatures.

Wigmore, J. K., Boyd, P., Kozorezov, A. G. & Bradley, D. I. 2004 Proceedings of the 6th European conference on applied superconductivity: EUCAS. Bristol: Institute of Physics, p. 3007-3013 7 p.

Research output: Contribution in Book/Report/ProceedingsChapter

Quasiparticle dynamics in a tantalum superconducting tunnel junction photon detector studied using phonon pulses.

Wigmore, J. K., Boyd, P., Kozorezov, A. G. & Bradley, D. I. 2004 In : physica status solidi (c). 1, 11, p. 2791-2794 4 p.

Research output: Contribution to journalJournal article

2003

Direct observation of the Andreev reflection of a quasiparticle beam by quantum turbulence in superfluid He-3-B.

Bradley, D. I., Fisher, S. N., Guénault, A. M., Lowe, M. R., Pickett, G. R. & Rahm, A. 05/2003 In : Physica B: Condensed Matter. 329, 1, p. 64-65 2 p.

Research output: Contribution to journalJournal article

Spatial extent of quantum turbulence in non-rotating superfluid He-3-B.

Bradley, D. I., Fisher, S. N., Guénault, A. M., Lowe, M. R., Pickett, G. R. & Rahm, A. 05/2003 In : Physica B: Condensed Matter. 329, 1, p. 104-405 302 p.

Research output: Contribution to journalJournal article

2002

Heat pulse studies of quasiparticle dynamics in superconducting tunnel junction photon detectors.

Steele, A. C., Boyd, P., Kozorezov, A. G., Wigmore, J. K. & Bradley, D. I. 05/2002 In : Physica B: Condensed Matter. 316-31, 1, p. 583-585 3 p.

Research output: Contribution to journalJournal article

2001

Comment on "Repetitive single vortex-loop creation by a vibrating wire in superfluid He-3-B" - Reply.

Bradley, D. I. & Pickett, G. R. 07/2001 In : Physical Review Letters. 87, 5, 1 p.059602

Research output: Contribution to journalJournal article

Preliminary measurements of Andreev reflection of quasiparticles by turbulence in superfluid He-3.

Bradley, D. I., Fisher, S. N., Guénault, A. M., Lowe, M. R., Pickett, G. R. & Rahm, A. 07/2001 In : Journal of Low Temperature Physics. 124, 1-2, p. 113-122 10 p.

Research output: Contribution to journalJournal article

2000

An RF-SQUID amplifier system for use with vibrating wire resonators

Bradley, D. I. & Hayes, W. M. 06/2000 In : Journal of Low Temperature Physics. 119, 5-6, p. 703-713 11 p.

Research output: Contribution to journalJournal article

Possible vortex production by a vibrating wire in superfluid He-3-B

Bradley, D. I. & Guénault, A. M. 05/2000 In : Physica B: Condensed Matter. 280, 1-4, p. 128-129 2 p.

Research output: Contribution to journalJournal article

Repetitive single vortex-loop creation by a vibrating wire in superfluid He-3-B

Bradley, D. I. 7/02/2000 In : Physical review letters. 84, 6, p. 1252-1255 4 p.

Research output: Contribution to journalJournal article

Regular vortex production by a moving wire in superfluid He-3-B.

Bradley, D. I. & Pickett, G. R. 2000 Topological Defects and the non-equilibrium dynamics of symmetry breaking phase transitions. Bunkov, Y. M. & Godfrin, H. (eds.). Dordrecht: Springer, Vol. 549, p. 345-351 7 p. (NATO ADVANCED SCIENCE INSTITUTES SERIES, SERIES C, MATHEMATICAL AND PHYSICAL SCIENCES)

Research output: Contribution in Book/Report/ProceedingsChapter

1998

Measuring the decay of vorticity in superfluid He-3-B: a progress report

Bradley, I., Fisher, S. N., Hayes, W. M. & Bradley, I. 12/1998 In : Journal of Low Temperature Physics. 113, 5-6, p. 687-692 6 p.

Research output: Contribution to journalJournal article

Measurements on the generation and subsequent decay of vorticity in superfluid He-3-B

Bradley, D. I., Fisher, S. & Hayes, W. M. 1998 COSMO-97: First International Workshop on Particle Physics and the Early Universe. Roszkowski, L. (ed.). Singapore: World Scientific, p. 432-434 3 p.

Research output: Contribution in Book/Report/ProceedingsConference contribution

1996

The detection of low energy neutrons and gamma-rays by superfluid He-3, a potential dark matter detector

Bradley, D. I., Follows, M. R., Hayes, W. M. & Sloan, T. 11/02/1996 In : Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 370, 1, p. 141-143 3 p.

Research output: Contribution to journalJournal article

A theoretical simulation of a superfluid He-3-B nuclear recoil detector

Bradley, D. I., Hayes, W. M. & Sloan, T. 1996 In : Czechoslovak Journal of Physics. 46, 5 (supplement), p. 2885-2886 2 p.

Research output: Contribution to journalJournal article

1995

A highly sensitive nuclear recoil detector based on superfluid3He-B

Bradley, D. I., Bunkov, Y. M., Cousins, D. J., Enrico, M. P., Fisher, S. N., Follows, M. R., Guénault, A. M., Hayes, W. M., Pickett, G. R. & Sloan, T. 10/1995 In : Journal of Low Temperature Physics. 101, 1-2, p. 9-16 8 p.

Research output: Contribution to journalJournal article

Potential dark matter detector?: the detection of low energy neutrons by superfluid 3He

Bradley, D. I., Bunkov, Y. M., Cousins, D. J., Enrico, M. P., Fisher, S., Follows, M. R., Guénault, A. M., Hayes, W. M., Pickett, G. & Sloan, T. 4/09/1995 In : Physical review letters. 75, 10, p. 1887-1890 4 p.

Research output: Contribution to journalJournal article

1994

Simple design for dilution refrigerator with base temperature of 2.3 mK

Bradley, D. I., Follows, M. R., Miller, I., Oswald, R. & Ward, M. 1/01/1994 In : Cryogenics. 34, 6, p. 549-550 2 p.

Research output: Contribution to journalJournal article

1990

Viscosity of the 3He-4He dilute phase in the mixing chamber of a dilution refrigerator

Bradley, D. I. & OSWALD, R. 07/1990 In : Journal of Low Temperature Physics. 80, 1-2, p. 89-97 9 p.

Research output: Contribution to journalJournal article

Current Students

Research students currently supervised by Ian Bradley include: