Imperial College London

ProfessorNeilAlford

Central FacultyOffice of the Provost

Associate Provost (Academic Planning)
 
 
 
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Contact

 

+44 (0)20 7594 6724n.alford

 
 
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Assistant

 

Miss Catherine Graham +44 (0)20 7594 3330

 
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Location

 

2..05 (in RSM) or 3.09 (in the Faculty Building)Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

409 results found

Miklich AH, Koelle D, Shaw TJ, Ludwig F, Nemeth DT, Dantsker E, Clarke J, Alford NM, Button TW, Colclough MSet al., 1994, Low-frequency excess noise in YBa<inf>2</inf>Cu<inf>3</inf>O<inf>7-x</inf> dc superconducting quantum interference devices cooled in static magnetic fields, Applied Physics Letters, Vol: 64, Pages: 3494-3496, ISSN: 0003-6951

We have investigated the performance of YBa2Cu3O 7-x dc superconducting quantum interference devices (SQUIDs) cooled in static magnetic fields, B0, of 0.01-1 mT. For fields less than the earth's ambient field, about 0.05 mT, the white noise of the devices at 77 K is not materially affected. However, at a frequency f of 1 Hz the spectral density of the 1/f noise, SΦ (1 Hz), at 0.05 mT increases by an order of magnitude over that for zero field. Furthermore, SΦ (1 Hz) scales approximately linearly with B0, suggesting strongly that the noise originates in the motion of vortices in the YBCO film. This increase in noise is likely to be an issue for SQUIDs operated in the earth's field.

Journal article

IVRISSIMTZIS LP, LANCASTER MJ, MCLEAN TSM, ALFORD NMet al., 1994, HIGH-GAIN SERIES FED PRINTED DIPOLE ARRAYS MADE OF HIGH-T(C) SUPERCONDUCTORS, IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, Vol: 42, Pages: 1419-1429, ISSN: 0018-926X

Journal article

JONES AR, CARDWELL DA, INGLE NJC, ASHWORTH SP, CAMPBELL AM, ALFORD NM, BUTTON TW, WELLHOFER F, ABELL JSet al., 1994, CORRELATION OF TRANSPORT AND MAGNETIC CRITICAL CURRENTS IN MELT-PROCESSED YBA2CU3O7-DELTA THICK-FILMS, JOURNAL OF APPLIED PHYSICS, Vol: 76, Pages: 1720-1725, ISSN: 0021-8979

Journal article

CARDWELL DA, JONES AR, INGLE NJC, CAMPBELL AM, BUTTON TW, ALFORD NM, WELLHOFER F, ABELL JSet al., 1994, INVESTIGATION OF CRITICAL-STATE IN MELT-PROCESSED YBA2CU3O7-DELTA THICK-FILMS, CRYOGENICS, Vol: 34, Pages: 671-677, ISSN: 0011-2275

Journal article

IVRISSIMTZIS LP, LANCASTER MJ, MACLEAN TSM, ALFORD NMet al., 1994, ON THE DESIGN AND PERFORMANCE OF ELECTRICALLY SMALL PRINTED THICK-FILM YBA2CU3O7-X ANTENNAS, IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Vol: 4, Pages: 33-40, ISSN: 1051-8223

Journal article

IVRISSIMTZIS LP, LANCASTER MJ, MACLEAN TSM, ALFORD NMet al., 1994, HIGH-GAIN PRINTED DIPOLE ARRAY MADE OF THICK-FILM HIGH-T-C SUPERCONDUCTING MATERIAL, ELECTRONICS LETTERS, Vol: 30, Pages: 92-93, ISSN: 0013-5194

Journal article

Phillips WA, Jedamzik D, Lamacraft K, Zammattio S, Greed RB, Hedges SJ, Whitehead PR, Nicholson BF, Button TW, Alford NMCN, Peters N, Grier Jet al., 1994, An Integrated 11GHz Cryogenic Downconverter, Pages: 658-663

© 1994 IEEE. A cryogenic downconverter has been designed and built to demonstrate the integration of semiconducting and superconducting components in a complete subsystem cooled by a closed cycle Stirling cryocooler. The frequency selective receiver converts 11 GHz (X-band) signals to an IF of 1000 MHz using a high temperature superconducting (HTS) microstrip input filter with a 1% bandwidth, a silicon diode mixer and a local oscillator stabilized by means of a 10 GHz HTS cavity and driven by a GaAs HEMT. The components are packaged into a cryogenic unit cooled to 60K Details of the system integration are presented, together with microwave and thermal test results.

Conference paper

PENN SJ, ALFORD NM, HALL AS, BUTTON TW, JOHNSTONE R, ZAMMATTIO SJ, YOUNG IRet al., 1993, DESIGN OF RF RECEIVER COILS FABRICATED FROM HIGH-TEMPERATURE SUPERCONDUCTOR FOR USE IN WHOLE-BODY IMAGING EQUIPMENT, WORLD CONGRESS ON SUPERCONDUCTIVITY, Publisher: PERGAMON-ELSEVIER SCIENCE LTD, Pages: 1855-1861, ISSN: 0964-1807

Conference paper

EASTHAM JF, HALL AS, ALFORD NM, HILLCOTTINGHAM R, AKMESE R, YOUNG IRet al., 1993, PRELIMINARY INVESTIGATION OF THE UTILITY OF HIGH-TEMPERATURE SUPERCONDUCTOR AS A MEANS OF STABILIZING A RESISTIVE NMR MAGNET, WORLD CONGRESS ON SUPERCONDUCTIVITY, Publisher: PERGAMON-ELSEVIER SCIENCE LTD, Pages: 1849-1854, ISSN: 0964-1807

Conference paper

ALFORD NEIL MCNEILL, 1993, Article of ceramic material and production thereof, US5248464

Patent

KHAMAS SK, COOK GG, KINGSLEY SP, WOODS RC, ALFORD NMet al., 1993, INVESTIGATION OF THE ENHANCED EFFICIENCIES OF SMALL SUPERCONDUCTING LOOP ANTENNA ELEMENTS, JOURNAL OF APPLIED PHYSICS, Vol: 74, Pages: 2914-2918, ISSN: 0021-8979

Journal article

HOSKING MW, TONKIN BA, PROYKOVA YG, HEWITT A, ALFORD NM, BUTTON TWet al., 1993, THE DIELECTRIC-CONSTANT OF LIQUID-NITROGEN OVER THE FREQUENCY-RANGE 0.5 TO 10.4 GHZ, SUPERCONDUCTOR SCIENCE & TECHNOLOGY, Vol: 6, Pages: 549-552, ISSN: 0953-2048

Journal article

HOSKING MW, TONKIN BA, PROYKOVA YG, HEWITT A, ALFORD NM, BUTTON TWet al., 1993, THE LINEAR EXPANSION OF YTTRIA-STABILIZED ZIRCONIA AT 77-K USING A MICROWAVE RING-RESONATOR METHOD, JOURNAL OF MATERIALS SCIENCE LETTERS, Vol: 12, Pages: 878-879, ISSN: 0261-8028

Journal article

Penn SJ, Alford NM, Button TW, Court GRet al., 1993, THE MAGNETIC HYSTERESIS OF POLYCRYSTALLINE YBa2Cu3Ox, IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Vol: 3, Pages: 1157-1160, ISSN: 1051-8223

Journal article

Askew TR, Nestell JG, Flippen RB, Groski DM, Alford NMet al., 1993, DYNAMIC MEASUREMENT OF FLUX FLOW RESISTIVITY IN YBa2Cu3O7 WIRES, IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Vol: 3, Pages: 1398-1401, ISSN: 1051-8223

Journal article

Holt TB, Grovenor CRM, Button TW, Alford NM, Dew-Hughes Det al., 1993, CONTINUOUS MELT PROCESSING OF YBCO THICK FILMS ON ZIRCONIA RODS, IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Vol: 3, Pages: 1698-1701, ISSN: 1051-8223

Journal article

Lancaster MJ, Maclean TSM, Niblett J, Alford NM, Button TWet al., 1993, YBCO THICK FILM LOOP ANTENNA AND MATCHING NETWORK, IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Vol: 3, Pages: 2903-2905, ISSN: 1051-8223

Journal article

Muirhead CM, Wellhofer F, Button TW, Alford NMet al., 1993, ASSESSMENT OF THICK FILM YBCO FOR FLUX TRANSFORMER AND MAGNETIC SCREENING APPLICATIONS, IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Vol: 3, Pages: 1695-1697, ISSN: 1051-8223

Journal article

Button TW, Smith PA, Wu Z, Alford NM, Davis LE, Penn SJet al., 1993, RF POWER DEPENDENCE OF YBCO THICK FILMS, IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Vol: 3, Pages: 1450-1452, ISSN: 1051-8223

Journal article

LANCASTER MJ, MACLEAN TSM, NIBLETT J, ALFORD NM, BUTTON TWet al., 1993, YBCO THICK-FILM LOOP ANTENNA AND MATCHING NETWORK, 1992 Applied Superconductivity Conference, Publisher: I E E E, Pages: 2903-2905

Conference paper

HOLT TB, GROVENOR CRM, BUTTON TW, ALFORD NM, DEWHUGHES Det al., 1993, CONTINUOUS MELT PROCESSING OF YBCO THICK-FILMS ON ZIRCONIA RODS, 1992 Applied Superconductivity Conference, Publisher: I E E E, Pages: 1698-1701

Conference paper

MUIRHEAD CM, WELLHOFER F, BUTTON TW, ALFORD NMet al., 1993, ASSESSMENT OF THICK-FILM YBCO FOR FLUX TRANSFORMER AND MAGNETIC SCREENING APPLICATIONS, 1992 Applied Superconductivity Conference, Publisher: I E E E, Pages: 1695-1697

Conference paper

ASKEW TR, NESTELL JG, FLIPPEN RB, GROSKI DM, ALFORD NMet al., 1993, DYNAMIC MEASUREMENT OF FLUX-FLOW RESISTIVITY IN YBA2CU3O7 WIRES, 1992 Applied Superconductivity Conference, Publisher: I E E E, Pages: 1398-1401

Conference paper

BUTTON TW, SMITH PA, WU Z, ALFORD NM, DAVIS LE, PENN SJet al., 1993, RF POWER DEPENDENCE OF YBCO THICK-FILMS, 1992 Applied Superconductivity Conference, Publisher: I E E E, Pages: 1450-1452

Conference paper

MILLER MM, CARROLL T, SOULEN R, TOTH L, RAYNE R, ALFORD NM, SAUNDERS CSet al., 1993, MAGNETIC SHIELDING AND NOISE SPECTRUM MEASUREMENTS OF Y-BA-CU-O, BI-SR-CA-CU-O AND (BI,PB)-SR-CA-CU-O SUPERCONDUCTING TUBES, CRYOGENICS, Vol: 33, Pages: 180-183, ISSN: 0011-2275

Journal article

PENN SJ, ALFORD NM, BUTTON TW, COURT GRet al., 1993, THE MAGNETIC HYSTERESIS OF POLYCRYSTALLINE YBA2CU3OX, 1992 Applied Superconductivity Conference, Publisher: I E E E, Pages: 1157-1160

Conference paper

ALFORD NM, 1992, APPLICATIONS OF HIGH-TEMPERATURE SUPERCONDUCTORS, CHEMISTRY & INDUSTRY, Pages: 809-812, ISSN: 0009-3068

Journal article

ALFORD NEIL MC, BIRCHALL JAMES D, 1992, COMPOSITION COMPRISING CERAMIC PARTICLES, KR920007016B

Patent

HEPBURN BJ, LAU HL, LYON SB, NEWMAN RC, THOMPSON GE, ALFORD Net al., 1992, ELECTROCHEMICAL-BEHAVIOR OF THE SUPERCONDUCTOR YBA2CU3O7-X IN SOLUTIONS CONTAINING VARIOUS ANIONS, CORROSION SCIENCE, Vol: 33, Pages: 515-525, ISSN: 0010-938X

Journal article

LANCASTER M, WU Z, HUANG Y, MACLEAN TSM, ZHOU X, GOUGH C, ALFORD NMet al., 1992, SUPERCONDUCTING ANTENNAS, SUPERCONDUCTOR SCIENCE & TECHNOLOGY, Vol: 5, Pages: 277-279, ISSN: 0953-2048

Journal article

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