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High Frequency Nonlinear Response of Superconducting Cavity-Grade Nb surfaces / Oripov, Bakhrom (Maryland U.) ; Bieler, Thomas (Michigan State U.) ; Ciovati, Gianluigi (Jefferson Lab) ; Calatroni, Sergio (CERN) ; Dhakal, Pashupati (Jefferson Lab) ; Junginger, Tobias (Lancaster U. (main)) ; Malyshev, Oleg B. (Daresbury) ; Terenziani, Giovanni (CERN) ; Valente-Feliciano, Anne-Marie (Jefferson Lab) ; Valizadeh, Reza (Daresbury) et al.
Nb superconducting radio-frequency (SRF) cavities are observed to break down and lose their high-Q superconducting properties at accelerating gradients below the limits imposed by theory. The microscopic origins of SRF cavity breakdown are still a matter of some debate. [...]
arXiv:1904.07432.- 2019-06-13 - 9 p. - Published in : Phys. Rev. Applied 11 (2019) 064030 Fulltext: PDF;

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A low energy muon spin rotation and point contact tunneling study of niobium films prepared for superconducting cavities / Junginger, Tobias (Helmholtz-Zentrum, Berlin ; Lancaster U. (main) ; Cockcroft Inst. Accel. Sci. Tech.) ; Calatroni, S. (CERN) ; Sublet, A. (CERN) ; Terenziani, G. (CERN) ; Prokscha, T. (PSI, Villigen) ; Salman, Z. (PSI, Villigen) ; Suter, A. (PSI, Villigen) ; Proslier, T. (Argonne) ; Zasadzinski, J. (IIT, Chicago)
Point contact tunneling (PCT) and low energy muon spin rotation (LE-muSR) are used to probe, on the same samples, the surface superconducting properties of micrometer thick niobium films deposited onto copper substrates using different sputtereing techniques: diode, dc magnetron (dcMS) and HIPIMS. The combined results are compared to radio-frequency tests performances of RF cavities made with the same processes. [...]
arXiv:1703.08635.- 2017-11-07 - 14 p. - Published in : Supercond. Sci. Technol. 30 (2017) 125013 Fulltext: PDF; External links: 00002 Scanning electron microscope (SEM) images of the three samples used for the point contact tunneling measurements.; 00011 Asymmetry function versus time at \unit[50]{K} for the HIPIMS sample in a longitudinal field of 0,2 and 10 mT.; 00004 Surface resistance

$R\msub{S}$ as a function of peak surface magnetic field

$B\msub{p}$ for two quarter wave cavities at \unit[4.2]{K}.; 00007 (a) Example of conductance curves displaying the zero bias conductance peak obtained on the HIPIMS sample, the curves are shifted by 0.25 for more clarity.; 00001 Top: Schematics of the \unit[1.3]{GHz} sputtering setup as used to produce the dcMS and HIPIMS samples. The samples are located at the equator, the region of largest diameter. Bottom: Position of the HIE-ISOLDE Nb/Cu samples i9 and Tbi taken from the mock-up cavity for PCT and LE-

$\mu$ SR measurements respectively.; 00013 Asymmetry function of muons stooped in an N

$_2$ -overlayer on top of the HIPIMS sample.; 00010 Asymmetry functions obtained at zero field and

$T\approx$ \unit[3.5]{K} for the HIPIMS sample at the surface and the dcMS sample at about \unit[100]{nm} depth. The HIPIMS sample shows strong signs of muon dynamics possibly related to surface magnetism. The asymmetry function of the dcMS sample recovers to about 1/3 of its initial value, which signifies that each muon experiences a static magnetic field, while the fields seen by different muons are randomly distributed.; 00003 Surface resistance

$R\msub{S}$ as a function of peak surface magnetic field

$B\msub{p}$ for three thin film cavities.; 00005 Surface resistance

$R\msub{S}$ as a function of peak surface magnetic field

$B\msub{p}$ for three elliptical cavities.; 00000 Top: Schematics of the \unit[1.3]{GHz} sputtering setup as used to produce the dcMS and HIPIMS samples. The samples are located at the equator, the region of largest diameter. Bottom: Position of the HIE-ISOLDE Nb/Cu samples i9 and Tbi taken from the mock-up cavity for PCT and LE-

$\mu$ SR measurements respectively.; 00008 Penetration of the magnetic field in three Nb/Cu samples at

$T\approx$ \unit[3.5]{K}; 00014 Stopping profiles of muons in niobium of different energy calculated with the TRIM.SP software.; 00009 Penetration depth change measured on a \unit[1.3]{GHz} HIPIMS cavity as a function of

$f(T)=1/\sqrt{1-(\frac{T}{T\msub{c}})^4}-1$ \cite{Junginger_PRSTAB_2015}.; 00015 Asymmetry function of muons stopped on a N

$_2$ layer grown on a Ni plate.; 00012 Hop rate

$\nu$ as a function of temperature for the HIPIMS sample. The line is a guide to the eye.; 00006 Summary of the PCTS measurement performed on 3 niobium samples deposited on Cu substrate with 3 different deposition methods; (a) HIPIMS, (b) standard DC magnetron sputtering or dcMS and (c) diode sputtering. For each sample, 80 to 100 junctions were measured. A set of about 10 representative normalized tunneling conductance curves are represented on the left (shifted by 0.25 for more clarity). The statistics of the superconducting gap

$\Delta$ and inelastic parameter

$\Gamma/\Delta$ as extracted from the fits are displayed in the middle. The temperature dependence of a characteristic tunnel junction is shown on the right with the corresponding temperature dependence of

$\Delta$ . (d) Example of conductance spectrum shifted by 0.25 that show no hint of superconductivity and considered as normal metal junctions

$\Delta$ = 0 meV. (e) Example of tunnel junction showing very peculiar background for V

$\ge\Delta$ , the curves have been shifted by 1 for more clarity.

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Low energy muon spin rotation and point contact tunneling applied to niobium films for SRF cavities / Junginger, Tobias (Alberta U. ; TRIUMF) ; Calatroni, Sergio (CERN) ; Prokscha, Thomas (PSI, Villigen) ; Proslier, Thomas (Argonne (main)) ; Salman, Zaher (PSI, Villigen) ; Suter, Andreas (PSI, Villigen) ; Terenziani, Giovanni (CERN ; Sheffield U.) ; Zasadzinski, John (IIT, Chicago (main))
Muon spin rotation (muSR) and point contact tunneling (PCT) are used since several years for bulk niobium studies. Here we present studies on niobium thin film samples of different deposition techniques (diode, magnetron and HIPIMS) and compare the results with RF measurements and bulk niobium results. [...]
2015 - 5 p. - Published in : 10.18429/JACoW-SRF2015-TUPB042 Fulltext: PDF;
In : 17th International Conference on RF Superconductivity, Whistler, Canada, 13 - 18 Sep 2015, pp.TUPB042

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Biased HiPIMS technology for superconducting rf accelerating cavities coating / G. Rosaz, G. (CERN) ; Terenziani, G. (CERN) ; Sonato, D. (CERN) ; Calatroni, S. (CERN) ; Ehiasarian, A. (Sheffield Hallam U.) ; Junginger, T. (CERN) ; Taborelli, M. (CERN)
In the last few years the interest of the thin film science and technology community on High Impulse Power Magnetron Sputtering (HIPIMS) coatings has steadily increased. HIPIMS literature shows that better thin film morphology, denser and smoother films can be achieved when compared with standard dc Magnetron Sputtering (dcMS) coating technology. [...]
CERN-ACC-2016-0052.- Geneva : CERN, 2016 - Published in : Fulltext: PDF;
In : 6th International Conference on Fundamentals and Industrial Applications of HIPIMS 2015, Braunschweig, Germany, 10 - 11 Jun 2015

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NB Coating Developments with HIPIMS for SRF Applications / Terenziani, G (CERN) ; Calatroni, S (CERN) ; Junginger, T (CERN) ; Santillana, I A (CERN) ; Ehiasarian, A P (Sheffield Hallam U.)
In the last few years the interest of the thin film science and technology community on High Impulse Power Magnetron Sputtering (HIPIMS) coatings has steadily increased. HIPIMS literature shows that better thin film morphology, denser and smoother films can be achieved when compared with standard dc Magnetron Sputtering (dcMS) coating technology [1]. [...]
2013 - 4 p. Published version from JACoW: PDF;
In : 16th International Conference on RF Superconductivity, Paris, France, 23 - 27 Sep 2013, pp.tup078

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RF Characterization of Niobium Films for Superconducting Cavities / Aull† , S (CERN ; University of Siegen, Germany,) ; Calatroni, S (CERN) ; Doebert, S (CERN) ; Junginger, T (CERN) ; Ehiasarian, AP (Sheffield Hallam University, UK) ; Knobloch, J (University of Siegen, Germany ; Helmholtz-Zentrum Berlin, Germany) ; Terenziani, G (CERN ; Sheffield Hallam University, UK)
The surface resistance RS of superconductors shows a complex dependence on the external parameters such as temperature, frequency or radio-frequency (RF) field. The Quadrupole Resonator modes of 400, 800 and 1200 MHz allow measurements at actual operating frequencies of superconducting cavities. [...]
CERN-ACC-2013-0190.- Geneva : CERN, 2013 - 3 p. Fulltext: PDF;
In : 4th International Particle Accelerator Conference, Shanghai, China, 12 - 17 May 2013, pp.2399

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4	Terenziani, G
2	Terenziani, Giovanni

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