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Adele Ruosi took her Ph.D in Physics at the University of Salerno on "HTS Thin film fabrication  for infrared bolometric  detectors" in 1994. From august 1993 to October 1994 part of her research work was performed at the "Condensed Matter Physics Laboratory" of the University of  Minnesota, Minneapolis, MN. From 1995 to 2001 she has been researcher scientist of INFM (Istituto Nazionale per la Fisica della Materia) at the Dept. of Physics of the University of Naples. In 2001 she gain apposition as a permanent staff Field: Superconducting properties and devices; Nb/Nb Josephson junction fabrication and their application as X-ray and alpha particle detectors microwave properties of superconducting, HTc thin film fabrication and characterization and IR HTc bolometers fabrication thin film and their application in accelerating cavities, HTS-SQUID-based nondestructive evaluation technique on aircraft structures

-1994 Ph.D.in Physics at the University of Salerno.
"HTS Thin film fabrication to their use as IR bolometric  detectors"
Field: Superconducting properties and HTc devices;
Advisors: Prof. A. Barone and R. Vaglio

-1991 Physics degree with full marks (110/110) and cum laude at the University of Naples
"Design of a system to detect radiation by  superconducting structures"
Field: Superconducting properties and devices;
Advisor: Prof. A. Barone

Major Research interests:

- HTS SQUID based systems for testing of aircraft parts and other metallic and composite structures by eddy-current technique.

-Microwave properties of  LTS and HTS thin films for their use in accelerating cavities

-HTS  infrared detectors

-X-rays and  alpha-particle detectors based on low-Tc  superconducting tunnel junctions and on LTS thin film microstrips;

-Physics and technology of Josephson junctions

-LTS and HTS thin films fabrication and characterization

Scientific Activities:

Presently my activity is focused on nondestructive testings of materials by a HTS-SQUID based system. The system is mainly devoted to noninvasive analysis of electrically conductive materials in fields of applications such as aircraft industry and airplanes maintenance, nuclear physics and trains maintenance.

 Round robin tests  for the detection  of flaws which result from the machining process or aging of planar stratified structures such as those commonly encountered in the aircraft industry are carried out by different eddy-current probes such as SQUID magnetometers, induction coils, flux-gates and Hall sensors.

To evaluate the accuracy and reliability of the measuring system, two different  three-dimensional numerical models of the eddy-current perturbation (electromagnetic direct problem) of electrically conductive plates affected by flaws, were implemented. The  formulation based on a finite element method was tackled in collaboration with the Centro Italiano Ricerche Aerospaziali  CIRA, Capua, Italy. A less computationally demanding model  cast in a vector wavefield integral equation framework was developed in collaboration with DRÉ-LSS, CNRS-SUPÉLEC, Gif-sur-Yvette Cedex, France

Our investigation has also been extended to materials of higher complexity, used in aircraft industry, e.g. anistotropic N-ply reinforced carbon fiber composite. Also in this application, interesting for the airplanes maintenance, the better performance of the SQUID in detecting areas damaged by low energy impact as compared to other traditional probes was demonstrated.

In emerging fields of application of the magnetometry and/or where the high performance of SQUID are not required we first demonstrate the feasibility of the technique  by traditional probes and consecutively we make a comparative analysis of the results with the ones obtained by the HTS-SQUID-based system .

Within this type of approach, in collaboration with the Istituto Nazionale per la Fisica Nucleare (INFN) of Padova, Italy, a contactless and non intrusive technique based on flux-gate magnetometry has been  proposed as a possible diagnostics of the buffered chemical polishing of a resonator cavity and for monitoring the hydrogen desorption from an hydrogenated niobium sample.

In addition, noninvasive measurements of magnetic fields above Insulated Gate Bipolar Transistor (IGBT) power modules used in the train motors have also been performed by flux-gates and Hall sensors. A clear signature of uneven current distribution among the chips caused by electrical, thermal and/or mechanical over-stresses inside the module, which in turns affects its reliability is obtained.

From august 1993 to october 1994 my research work was performed at the "Condensed Matter Physics Laboratory" of the University of  Minnesota (Minneapolis, USA). The research was focused on understanding the mechanism of the growth and structure of DyBa2Cu3O7-x thin films,  with the intent of fabricating, by ozone assisted molecular beam epitaxy, high quality thin films for scientific and commercial applications such as Josephson Junctions.

I collaborated also on the growth of high quality films of LaxCa1-xMnO3-d which exhibit colossal magnetoresistance and multilayer thin films combining the magnetic oxides and high temperature superconductors.

In collaboration with CERN, I optimized the quality factor of accelerating cavities  by  Nb  and NbS3N thin film coatings. My research work at the University of Naples consisted in the fabrication  of high quality  Nb, Nb3Sn by sputtering and in their characterization by transport and microwave properties.

My PhD research program focused on the realization of a prototype  infrared bolometer based on  high quality BiSrCaCuO epitaxial film and  BiSrCaCuO single crystal. The research was carried out in  collaboration with the Phys. Dept. and the Eng. Dept. of the University of Roma. Preliminary results obtained from the electrical noise voltage spectrum and from the analysis of the optical response indicate that infrared  bolometers  based on single crystal BSCCO can be competitive with the commercial detectors operating at room temperature. 

A second program of research consisted of realization of another kind of radiation detector based on (NbxV1-x)N thin film microstrip in collaboration with the University of Napoli. In fact  (NbxV1-x)N superconducting  thin film particles detectors, having low sensitivity to radiation damage (a requirement for detectors at the Superconducting Supercollider), are attractive as potential minimum ionizing particle detectors. During this period I developed  techniques to magnetron-sputter ((NbxV1-x)N  thin films and characterized their structure  (X-ray diffraction) and  composition (EDS) . 

The thesis work has been performed in the Laboratory of Superconductivity at the Physics Dept. of the University of Napoli, from September 1989 to July 1991. This research was partialy supported by  the INFN (Istituto Nazionale di Fisica Nucleare).

In this work  the potential  application of Superconducting  Tunnel Junctions  (STJ) to  high resolution nuclear-radiation detectors has been investigated. The work consisted both of the design and realization of the cryogenic system and  related electronic apparatus necessary to detect the signal due to radiation on the STJ  and  in the fabrication  and optimization of  Nb-AlxOy-Nb and Pb-PbxOy-Nb tunnel junctions. This research allowed the acquisition of knowledge of STJ fabrication (thin film sputter deposition and set-up of  standard photolithographic processes) and  characterization at low-temperature and in magnetic field. From a theoretical point of view, the non equilibrium phenomena in superconductivity and the role of proximity effect on the relaxation times of a STJ detector has been extensively studied in order to optimize the performance of the device and the design of the detecting apparatus.

Talks and seminars:

-Infrared detection based on HTS  bolometers,

Department of Science and Applications of Superconductivity, University of Minnesota, MPL, USA, 16 Novembre 1993

-Fabbricazione di film sottili di ossidi cuprati superconduttori per la realizzazione di rivelatori bolometrici di radiazione infrarossa.

Dipartimento di Scienze Fisiche, Universita’ di Salerno, 31 Ottobre 1994

-Eddy current nondestructive measurements using SQUIDS. a "Electromagnetic Nondestructive Evaluation Conference 1997", 16-18 September 1997, Reggio di Calabria, Italy

-Comparison between superconductive and traditional electromagnetic probes in eddy-current nondestructive testing. "Electromagnetic Nondestructive Evaluation Conference 1998", 16-18 September 1998, Parigi

-Eddy current nondestructive evaluation using SQUIDs: from theory to laboratory controlled experiments.. Invited speaker at the "Electromagnetic Inverse Problem Conference”, 30 settembre-2 ottobre 1998, Vietri, Salerno.

-Superconductive and traditional electromagnetic probes in eddy current nondestructive testing of conductive materials. Workshop “Superconduttivita’ Felix 1998, 21 dicembre, Salerno, Italy

-High Tc SQUIDs and eddy current NDE: a comprehensive investigation from real data to modeling and viceversa. Invited speaker at International Union of Radio Science (U.R.S.I) Toronto General Assembly 1999   16-21 agosto 1999

-Experimental and Theoretical results in  Nondestructive Evaluation  using HTS-SQUIDs. Invited speaker at the High-Level Scientific Conferences organized by  the European Science Foundation on the “Future Perspectives of Superconducting Josephson Device: Euroconference on Physics and Application of Multi-Junction Superconducting Josephson Devices, Acquafredda di Maratea, Italy, 1-6 July 2000.

-Analysis of Low-velocity impact damages in reinforced carbon fiber composites by HTS-SQUID magnetometers. Applied Superconductivity Conference 2000, Virginia Beach, Va, 17-22 sept. 2000

Publications:

1) "The effect of a proximity layer on the response of a STJ detector",

E.Esposito, G.P. Pepe, A. Ruosi, U. Scotti di Uccio,

"Tunneling Phenomena in  High and  Low Tc Superconductors" , A. Di Chiara and M. Russo (eds), Italy 119-127, 1991

2) "BSCCO films for composite bolometers working at 77 K"

G.Balestrino, A.Bottiglione,M.Epifani,L.Maritato,E.Milani,M.Montuori,

P.Paroli,A.Ruosi,R.Scafuro;

Proceedings Conferenza Nazionale Superconduttori ad alta Tc, SATT5,Capri,Italy,1 664-1665, 1992

3) "Bolometri superconduttori ad alta temperatura "

M.Epifani,P.Mancino,G.Balestrino, E. Milani, L.Maritato,A.Ruosi,R.Vaglio

Proceedings Conferenza Nazionale Superconduttori ad alta Tc, SATT6 Riccione, Italy, 1993

4) "A new concept of superconducting infrared detector",

A. Ruosi e R. Vaglio

Proceedings Congresso Nazionale di Fisica della materia, INFM, Napoli, Castel dell'Ovo, Maggio 1995

5) "Feasibility of a high temperature bolometer based on BiSrCaCuO superconducting films";

A. Bottiglione, M.Epifani,G.Balestrino, E.Milani, M.Montuori, A.Ruosi, R.Scafuro;

J. Appl Phys. Lett. 74 (1) , 704-707, 1993

6) "Explanation of the resistance peak anomaly in non-homogeneous superconductors",

R. Vaglio, C. Attanasio, L. Maritato, A. Ruosi;

Phys.Rev. B 47, 22, 15302-15303, 1993

7) "Composite bolometers based on  BiSrCaCuO single crystals",

G.Balestrino, A. Bottiglione, M.Epifani, P. Mancino, L. Maritato, E. Milani, P. Paroli, A. Ruosi, R. Scafuro, R. Vaglio;

Journal of Alloys and Compounds, 195, 727-730, 1993

8) "Fast growth of Bi2Sr2Ca2Cu3O10+x and Bi2Sr2CaCu2O8+x thin crystals at the surface of KCL fluxes"

G.Balestrino, E. Milani, A. Paoletti, A. Tebano, Y.H.Wang, A. Ruosi, R. Vaglio, M. Valentino, P. Paroli

Appl. Phys. Lett., 64 (13),1735-1737, 1994

9) "X-rays operation of a thin film NbVN superconducting-strip particle detector"

L. Parlato, G. Peluso, G; Pepe, R. Vaglio, C. Attanasio, A. Ruosi, S. Barbanera, M. Cirillo, R. Leoni;

Nucl. Instr. and Meth. in Phys. Research A 348 127-130, 1994

6) "High energy  particle detection by NbVN superconducting strip"

C.Attanasio, L.Parlato, G. Peluso, G.Pepe, A. Ruosi,R. Vaglio

Cryogenics  , 34,(ICEC Supplement) 867-870, 1994

10) "Composite bolometer based on high temperature superconducting Bi2Sr2CaCu2O8+x crystals for application in the far infrared",

M.Epifani, P. Mancino, G.Balestrino, M. Marinelli, M. Montuori, E. Milani, A. Ruosi, R. Vaglio,

Journal de Physique IV, 4  C6-249-254, 1994

11)"R.F. field response of metallic superconductors by microstrip resonators"

A. Andreone, A. Cassinese, A. Di Chiara, M. Iavarone, A. Ruosi, R. Vaglio

Proceeding 7th Workshop on R.F. Superconductivity, Gif sur Yvette, France, 17-20 October, 1995

12)"Ultra-smooth, highly ordered, thin films of La0.67Ca0.33MnO3md",

V.A. Vasko, C. A. Nordman, P. A. Kraus, V.S. Achutaraman, A. Ruosi and A. M. Goldman,  Appl. Phys. Lett. 68, 2571-2573, 1996

13)"Magnetic and electrical properties of the ferrimagnet  Dy0.67Ca0.33MnO3md",  

C. A. Nordman, V.S. Achutaraman, V.A. Vasko, P. A. Kraus, A. Ruosi, A.M. Kadin  and A. M. Goldman

Rapid Communications , Phys Rev. B 54, 9023-9026, 1996

14)"Microwave Measurements of Superconducting Nb3Sn films by a microstrip resonator tecnique",

A.     Andreone, A. Cassinese, A. Di Chiara, M. Iavarone, A. Ruosi and R. Vaglio,

IEEE Trans. Appl.Supercond. Vol. 7, NO. 2, 1772-1775,1996

15)"Nonlinear microwave properties of Nb3Sn sputtered superconducting films", A. Andreone, A. Cassinese, A. Di Chiara, M. Iavarone, F. Palomba,  A. Ruosi and R. Vaglio, J. of Applied Physics,  82 (4), 1736-1742,1997

16) A new project on nondestructive evaluation with high temperature SQUID's.

G. Peluso, G. Pepe, A. Ruosi, A. Barone, P. Buonadonna, R. Teti, M. Valentino, U. Klein, C. Attanasio, L. Maritato, M. Salvato, C. Camerlingo, S. Pagano, M. Russo, E. Sarnelli, M. Prencipe

“Review of Progress in Quantitative Nondestructive Evaluation” Vol 16A, pag. 1083-1090, Donald O. Thompson and Dale E. Chimenti (eds), Plenum Press, New York,1997

17) Design of a NDE instrumentation prototype with high temperature SQUIDs. A. Barone, G. Peluso, G. Pepe, A. Ruosi, A. Barone, P. Buonadonna, R. Teti, M. Valentino, C. Attanasio, L. Maritato, M. Salvato, C. Camerlingo, S. Pagano, M. Russo, E. Sarnelli Nuovo Cimento, Vol.19 D, 8-9, 1495-1500, 1997

18) HTc SQUID for nondestructive evaluation S. Pagano, E. Sarnelli, C. Camerlingo, A. Monaco, M. Russo, G. Peluso, G. Pepe, A. Ruosi, M. Valentino, R. Teti, P. Buonadonna, L. Maritato, M. Salvato, M. Prencipe. “Studies in Applied Electromagnetics and Mechanics 14”, 206-214, A. Albanese, G. Rubinacci, T. Tagaki and S. S. Udpa (eds), IOS Press Amsterdam,1998 

19) Eddy current nondestructive measurements using SQUIDS: preliminary results. A. Ruosi, G. Peluso, G. Pepe, M. Valentino, S. Pagano, E. Sarnelli, C. Camerlingo, A. Monaco, M. Russo,  R. Teti, P. Buonadonna, L. Maritato, M. Salvato, M. Prencipe “Studies in Applied Electromagnetics and Mechanics 14”, 215-224,  A. Albanese, G. Rubinacci, T. Tagaki and S. S. Udpa (eds), IOS Press Amsterdam,1998

20) Measurements and 3-D Numerical Results in Nondestructive Evaluation using SQUIDs.  G. Pepe, G. Peluso, A. Ruosi, M. Valentino, D. Tescione “Review of Progress in Quantitative Nondestructive Evaluation"  Vol. 17, D. O. Thompson and D. E. Chimenti (eds), Plenum Press, New York, 1998.

21) Eddy-current nondestructive measurements with different HTS-SQUID spatial orientation.

M. Valentino, A. Ruosi, G. Pepe, G. Peluso

J. Phys. IV France 8, 249-252, 1998

22) Eddy current nondestructive evaluation using SQUIDs.

V. Monebhurrun, D. Lesselier, B. Duchene, A. Ruosi, M. Valentino, G. Pepe,

“Studies in Applied Electromagnetics and Mechanics 15”,  171-181, D. Lesselier and A. Razek (eds), IOS Press, Amsterdam,1999 

 23)Superconductive and electromagnetic probes in eddy current NDE for detection of deep defects. M. Valentino, A. Ruosi, G. Pepe, V. Monheburrun, D. Lesselier “Studies in Applied Electromagnetics and Mechanics 15”, 159-170, D. Lesselier and A. Razek (eds), IOS Press, Amsterdam,1999\ 

 24) Experimental results in eddy current nondestructive testing based on superconductive and conventional electromagnetic probes.

M. Valentino, A. Ruosi, G. Pepe, V. Mollo, R. D’Alto and G. Peluso International Journal of Modern Physics B, 13 (1999) 1117-1122

26)Experimental and theoretical results in electromagnetic nondestructive testing with HTS SQUIDs.

A. Ruosi, M. Valentino, G. Pepe, G. Peluso

IEEE Trans. Appl. Superconductivity, 1999 pp.3499-3502

27) Magnetic Field Imaging of Current Distributions in IGBT power Modules,  M. Valentino, A. Ruosi, G. Pepe, G. Busatto, submitted to Studies in Applied Electromagnetics and Mechanics, 16, IOS Press Amsterdam (2000)

28) High Tc SQUIDs and Eddy-current NDE: a Comprhensive Investigation from Real Data to modelling, A. Ruosi, M. Valentino, G, Pepe, V. Monebhurrun, D. Lesselier, B. Duchêne, to be published on Meas. Sci. Technol. (2000)

29) Analysis of low-velocity impact damages in reinforced carbon fiber composites by HTS-SQUID magnetometers, A. Ruosi, M. Valentino, G. Pepe, G. Peluso,  IEEE Trans. Appl. Superconductivity (2001),  submitted on sept. 2000

30) Experimental and Theoretical results in  Nondestructive Evaluation  using HTS-SQUIDs, A. Ruosi and M. Valentino

Web proceeding on the web site of the High-Level Scientific Conferences organized by the European Science Foundation on the “Future Perspectives of Superconducting Josephson Device: Euroconference on Physics and Application of Multi-Junction Superconducting Josephson Devices, Acquafredda di Maratea, Italy, 1-6 July 2000. http://www.ing.univaq.it/energeti/research/Fisica/proc1.htm