LIVIVO - Search results -

Search results

Result 1 - 10 of total 32

Search options

Article ; Online: Piezoelectric tunable microwave superconducting cavity.

C Carvalho, N / Fan, Y / Tobar, M E

2016 Volume 87, Issue 9, Page(s) 94702

Abstract: In the context of engineered quantum systems, there is a demand for superconducting tunable devices, able to operate with high-quality factors at power levels equivalent to only a few photons. In this work, we developed a 3D microwave re-entrant cavity ... ...

Abstract	In the context of engineered quantum systems, there is a demand for superconducting tunable devices, able to operate with high-quality factors at power levels equivalent to only a few photons. In this work, we developed a 3D microwave re-entrant cavity with such characteristics ready to provide a very fine-tuning of a high-Q resonant mode over a large dynamic range. This system has an electronic tuning mechanism based on a mechanically amplified piezoelectric actuator, which controls the resonator dominant mode frequency by changing the cavity narrow gap by very small displacements. Experiments were conducted at room and dilution refrigerator temperatures showing a large dynamic range up to 4 GHz and 1 GHz, respectively, and were compared to a finite element method model simulated data. At elevated microwave power input, nonlinear thermal effects were observed to destroy the superconductivity of the cavity due to the large electric fields generated in the small gap of the re-entrant cavity.
Language	English
Publishing date	2016-09
Publishing country	United States
Document type	Journal Article
ZDB-ID	209865-9
ISSN	1089-7623 ; 0034-6748
ISSN (online)	1089-7623
ISSN	0034-6748
DOI	10.1063/1.4962695
Database	MEDical Literature Analysis and Retrieval System OnLINE

In stock of ZB MED Bonn / Germany

Z 4' 46/112: Show issues

Order via subito

This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Details ▾
- See ZB MED holdings
- Order with fees

Article ; Online: Experiments match simulations in a multiple post reentrant cavity.

de Paula, L A N / Goryachev, M / Tobar, M E

The Review of scientific instruments

2017 Volume 88, Issue 12, Page(s) 125104

Abstract: Microwave reentrant cavities are used for many applications in science and engineering. The potential for both high mechanical tunability and high electric quality factors make them important tools in many areas. They are usually resonant cylindrical ... ...

Abstract	Microwave reentrant cavities are used for many applications in science and engineering. The potential for both high mechanical tunability and high electric quality factors make them important tools in many areas. They are usually resonant cylindrical cavities with a central post, which makes a small gap spacing with the cavity wall. By adding an arbitrary number of extra posts, they are generalized to a type of multiple post reentrant cavity. This new approach has been theoretically studied but no experimental results have been presented. The main purpose of this work was to compare experimental modes with simulated ones from a reentrant cavity made of forty nine cylindrical posts. Each post could be moved using a screw in order to make tunable gap spacing between the post top and the cavity cover. Eight different gap setups were made making it possible to investigate thirty six different reentrant modes at room temperature. The lowest frequency percentage agreement between experiment and simulation was 91.31%, and the best one was 99.92%. Taking into account all the modes, 94.44% of them agreed above 96%. Thus, we have determined an experimental procedure suitable to investigate the reentrant modes from multiple post cavities. There is a wide range of potential applications for such cavities due to their unique features compared to conventional ones.
Language	English
Publishing date	2017-12
Publishing country	United States
Document type	Journal Article
ZDB-ID	209865-9
ISSN	1089-7623 ; 0034-6748
ISSN (online)	1089-7623
ISSN	0034-6748
DOI	10.1063/1.4997626
Database	MEDical Literature Analysis and Retrieval System OnLINE

In stock of ZB MED Bonn / Germany

Z 4' 46/112: Show issues

Order via subito

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Details ▾
- See ZB MED holdings
- Order with fees

Article ; Online: Rigorous ESR spectroscopy of Fe

Hosain, M A / Le Floch, J-M / Krupka, J / Tobar, M E

Journal of physics. Condensed matter : an Institute of Physics journal

2018 Volume 30, Issue 29, Page(s) 295805

Abstract: ... Impurity ... ...

Abstract	Impurity Fe
Language	English
Publishing date	2018-06-12
Publishing country	England
Document type	Journal Article
ZDB-ID	1472968-4
ISSN	1361-648X ; 0953-8984
ISSN (online)	1361-648X
ISSN	0953-8984
DOI	10.1088/1361-648X/aacc05
Database	MEDical Literature Analysis and Retrieval System OnLINE

Order via subito

Article ; Online: Whispering Gallery mode ESR spectroscopy and parameters measurement in single crystal SrLaAlO

Hosain, M A / Le Floch, J-M / Krupka, J / Tobar, M E

Journal of magnetic resonance (San Diego, Calif. : 1997)

2017 Volume 281, Page(s) 209–216

Abstract: A cylindrical single crystal ... ...

Abstract	A cylindrical single crystal SrLaAlO
Language	English
Publishing date	2017-06-11
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	1469665-4
ISSN	1096-0856 ; 1557-8968 ; 1090-7807 ; 0022-2364
ISSN (online)	1096-0856 ; 1557-8968
ISSN	1090-7807 ; 0022-2364
DOI	10.1016/j.jmr.2017.06.007
Database	MEDical Literature Analysis and Retrieval System OnLINE

Order via subito

Book ; Online: Piezoelectric Tunable Microwave Superconducting Cavity

Carvalho, N. C. / Fan, Y. / Tobar, M. E.

2016

Abstract: In the context of engineered quantum systems, there is a demand for superconducting tunable devices able to operate with high Q-factors at power levels equivalent to only a few photons. In this work, we developed a 3D microwave reentrant cavity with such ...

Abstract	In the context of engineered quantum systems, there is a demand for superconducting tunable devices able to operate with high Q-factors at power levels equivalent to only a few photons. In this work, we developed a 3D microwave reentrant cavity with such characteristics ready to provide a very fine-tuning of a high-Q resonant mode over a large dynamic range. This system has an electronic tuning mechanism based on a mechanically amplified piezoelectric actuator, which controls the resonator dominant mode frequency by changing the cavity narrow gap by very small displacements. Experiments were conducted at room and dilution refrigerator temperatures showing a large dynamic range up to 4 GHz and 1 GHz, respectively, and were compared to a FEM model simulated data. At elevated microwave power input, nonlinear thermal effects were observed to destroy the superconductivity of the cavity due to the large electric fields generated in the small gap of the reentrant cavity.
Keywords	Physics - Instrumentation and Detectors
Subject code	600 ; 621
Publishing date	2016-03-15
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

Full text online

Full text

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article: Fabry-Perot resonator with interferometric read-out for low noise applications.

Tobar, M E

IEEE transactions on ultrasonics, ferroelectrics, and frequency control

2000 Volume 47, Issue 2, Page(s) 495–501

Abstract: New readout configurations for a Fabry-Perot (FP) resonator (or frequency discriminator) that combine the reflected and transmitted waves are analyzed in detail. The waves may be combined in a Sagnac (S) or Mach-Zehnder (MZ) configuration and tuned to a ... ...

Abstract	New readout configurations for a Fabry-Perot (FP) resonator (or frequency discriminator) that combine the reflected and transmitted waves are analyzed in detail. The waves may be combined in a Sagnac (S) or Mach-Zehnder (MZ) configuration and tuned to a dark port (DP) to suppress the carrier frequency. To achieve this in a standard FP resonator, the mirror reflectance must be extremely well matched, which is a difficult and expensive task. Suppressing the carrier minimizes the Shot noise floor of a Pound-Drever-Hall (PDH) frequency-stabilized laser. Moreover, depending on the amount of carrier suppression, a high amount of power may be injected into the resonator without saturating or destroying the photodetector at the discriminator output. Because the sensitivity of the frequency discriminator is also proportional to the injected power, a large improvement in frequency noise can be achieved for high power PDH-stabilized lasers utilizing only a small phase modulation index.
Language	English
Publishing date	2000
Publishing country	United States
Document type	Journal Article
ISSN	0885-3010
ISSN	0885-3010
DOI	10.1109/58.827442
Database	MEDical Literature Analysis and Retrieval System OnLINE

Order via subito

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Book ; Online: Ferroelectric two-level system and phase transition temperature monitoring of $SrTiO_3$ using dielectric resonance modes

Hosain, M. A. / Floch, J-M. Le / Bourhill, J. F. / Krupka, J. / Tobar, M. E.

2018

Abstract: The ferroelectric phase transition temperature of a single crystal $SrTiO_3$ cylindrical puck inserted into a cylindrical copper cavity has been measured around $51~K$ using quasi $TE_{m,1,1}$ and quasi $TM_{m,1,1}$ electromagnetic modes. The observed ... ...

Abstract	The ferroelectric phase transition temperature of a single crystal $SrTiO_3$ cylindrical puck inserted into a cylindrical copper cavity has been measured around $51~K$ using quasi $TE_{m,1,1}$ and quasi $TM_{m,1,1}$ electromagnetic modes. The observed results of such dielectric spectroscopy may be explained by implementing a quasiharmonic approximation of phonons in the incipient ferroelectric crystal $SrTiO_3$ lattice. The resonant modes act as very sensitive probe by implementing measurements of $Q$-factor, transmission or frequency shift when cooling down to low temperatures around a few Kelvin. The resonator dielectric losses reveals different crystal unit structure states and ferroelectric phase transition in continuous cooling. The ferroelectric phase transition initiates a spontaneous polarization $(P_s)$ forming a double-well potential in each crystal unit causing a two-level systems, which creates extra loss and changes the transmission characteristics and Q-factors of the modes. This process is able to describe resonator properties over a broad range of frequency. Landau's theory of correlation length supports the reported observations as the implication of phonon wave vector $q_c=0$ of central ion in crystal unit symmetry regarding soft-mode. Comment: Typos fixed
Keywords	Condensed Matter - Materials Science
Subject code	535
Publishing date	2018-04-17
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

Full text online

Full text

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article ; Online: Piezoelectric voltage coupled reentrant cavity resonator.

Carvalho, N C / Fan, Y / Le Floch, J-M / Tobar, M E

The Review of scientific instruments

2014 Volume 85, Issue 10, Page(s) 104705

Abstract: A piezoelectric voltage coupled microwave reentrant cavity has been developed. The central cavity post is bonded to a piezoelectric actuator allowing the voltage control of small post displacements over a high dynamic range. We show that such a cavity ... ...

Abstract	A piezoelectric voltage coupled microwave reentrant cavity has been developed. The central cavity post is bonded to a piezoelectric actuator allowing the voltage control of small post displacements over a high dynamic range. We show that such a cavity can be implemented as a voltage tunable resonator, a transducer for exciting and measuring mechanical modes of the structure, and a transducer for measuring comparative sensitivity of the piezoelectric material. Experiments were conducted at room and cryogenic temperatures with results verified using Finite Element software.
Language	English
Publishing date	2014-10
Publishing country	United States
Document type	Journal Article
ZDB-ID	209865-9
ISSN	1089-7623 ; 0034-6748
ISSN (online)	1089-7623
ISSN	0034-6748
DOI	10.1063/1.4897482
Database	MEDical Literature Analysis and Retrieval System OnLINE

In stock of ZB MED Bonn / Germany

Z 4' 46/112: Show issues

Order via subito

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Details ▾
- See ZB MED holdings
- Order with fees

Article ; Online: Search for a Dark-Matter-Induced Cosmic Axion Background with ADMX.

Nitta, T / Braine, T / Du, N / Guzzetti, M / Hanretty, C / Leum, G / Rosenberg, L J / Rybka, G / Sinnis, J / Clarke, John / Siddiqi, I / Awida, M H / Chou, A S / Hollister, M / Knirck, S / Sonnenschein, A / Wester, W / Gleason, J R / Hipp, A T /

Sikivie, P / Sullivan, N S / Tanner, D B / Khatiwada, R / Carosi, G / Robertson, N / Duffy, L D / Boutan, C / Lentz, E / Oblath, N S / Taubman, M S / Yang, J / Daw, E J / Perry, M G / Bartram, C / Buckley, J H / Gaikwad, C / Hoffman, J / Murch, K W / Goryachev, M / Hartman, E / McAllister, B T / Quiskamp, A / Thomson, C / Tobar, M E / Dror, J A / Murayama, H / Rodd, N L

Physical review letters

2023 Volume 131, Issue 10, Page(s) 101002

Abstract: We report the first result of a direct search for a cosmic axion background (CaB)-a relativistic background of axions that is not dark matter-performed with the axion haloscope, the Axion Dark Matter eXperiment (ADMX). Conventional haloscope analyses ... ...

Abstract	We report the first result of a direct search for a cosmic axion background (CaB)-a relativistic background of axions that is not dark matter-performed with the axion haloscope, the Axion Dark Matter eXperiment (ADMX). Conventional haloscope analyses search for a signal with a narrow bandwidth, as predicted for dark matter, whereas the CaB will be broad. We introduce a novel analysis strategy, which searches for a CaB induced daily modulation in the power measured by the haloscope. Using this, we repurpose data collected to search for dark matter to set a limit on the axion photon coupling of a CaB originating from dark matter cascade decay via a mediator in the 800-995 MHz frequency range. We find that the present sensitivity is limited by fluctuations in the cavity readout as the instrument scans across dark matter masses. Nevertheless, we suggest that these challenges can be surmounted using superconducting qubits as single photon counters, and allow ADMX to operate as a telescope searching for axions emerging from the decay of dark matter. The daily modulation analysis technique we introduce can be deployed for various broadband rf signals, such as other forms of a CaB or even high-frequency gravitational waves.
Language	English
Publishing date	2023-09-20
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.131.101002
Database	MEDical Literature Analysis and Retrieval System OnLINE

In stock of ZB MED Bonn / Germany

Z 4' 58/153: Show issues

Order via subito

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Details ▾
- See ZB MED holdings
- Order with fees

Article ; Online: Dark matter axion search using a Josephson Traveling wave parametric amplifier.

Bartram, C / Braine, T / Cervantes, R / Crisosto, N / Du, N / Leum, G / Mohapatra, P / Nitta, T / Rosenberg, L J / Rybka, G / Yang, J / Clarke, John / Siddiqi, I / Agrawal, A / Dixit, A V / Awida, M H / Chou, A S / Hollister, M / Knirck, S /

Sonnenschein, A / Wester, W / Gleason, J R / Hipp, A T / Jois, S / Sikivie, P / Sullivan, N S / Tanner, D B / Lentz, E / Khatiwada, R / Carosi, G / Cisneros, C / Robertson, N / Woollett, N / Duffy, L D / Boutan, C / Jones, M / LaRoque, B H / Oblath, N S / Taubman, M S / Daw, E J / Perry, M G / Buckley, J H / Gaikwad, C / Hoffman, J / Murch, K / Goryachev, M / McAllister, B T / Quiskamp, A / Thomson, C / Tobar, M E / Bolkhovsky, V / Calusine, G / Oliver, W / Serniak, K

The Review of scientific instruments

2023 Volume 94, Issue 4

Abstract: We describe the first implementation of a Josephson Traveling Wave Parametric Amplifier (JTWPA) in an axion dark matter search. The operation of the JTWPA for a period of about two weeks achieved sensitivity to axion-like particle dark matter with axion- ... ...

Abstract	We describe the first implementation of a Josephson Traveling Wave Parametric Amplifier (JTWPA) in an axion dark matter search. The operation of the JTWPA for a period of about two weeks achieved sensitivity to axion-like particle dark matter with axion-photon couplings above 10-13 Ge V-1 over a narrow range of axion masses centered around 19.84 µeV by tuning the resonant frequency of the cavity over the frequency range of 4796.7-4799.5 MHz. The JTWPA was operated in the insert of the axion dark matter experiment as part of an independent receiver chain that was attached to a 0.56-l cavity. The ability of the JTWPA to deliver high gain over a wide (3 GHz) bandwidth has engendered interest from those aiming to perform broadband axion searches, a longstanding goal in this field.
Language	English
Publishing date	2023-12-12
Publishing country	United States
Document type	Journal Article
ZDB-ID	209865-9
ISSN	1089-7623 ; 0034-6748
ISSN (online)	1089-7623
ISSN	0034-6748
DOI	10.1063/5.0122907
Database	MEDical Literature Analysis and Retrieval System OnLINE

In stock of ZB MED Bonn / Germany

Z 4' 46/112: Show issues

Order via subito

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Details ▾
- See ZB MED holdings
- Order with fees

To top

More links

Kategorien

In stock of ZB MED Bonn / Germany

Order via subito

Inter-library loan at ZB MED

More links

Kategorien

In stock of ZB MED Bonn / Germany

Order via subito

Inter-library loan at ZB MED

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

Full text online

More links

Kategorien

Inter-library loan at ZB MED

More links

Kategorien

Order via subito

Inter-library loan at ZB MED

Full text online

More links

Kategorien

Inter-library loan at ZB MED

More links

Kategorien

In stock of ZB MED Bonn / Germany

Order via subito

Inter-library loan at ZB MED

More links

Kategorien

In stock of ZB MED Bonn / Germany

Order via subito

Inter-library loan at ZB MED

More links

Kategorien

In stock of ZB MED Bonn / Germany

Order via subito

Inter-library loan at ZB MED