A method to measure the frequencies of individual half cells in a dumbbell cavity

An, Sun; Liping, Zhang; Yazhe, Tang; Li, Ying-min; Cho, Yong-Sub
October 2008
Review of Scientific Instruments;Oct2008, Vol. 79 Issue 10, p104701
Academic Journal
Dumbbell fabrication is a midprocess for manufacturing an elliptical superconducting rf cavity. In order to understand how a welding shrinkage affects a dumbbell’s frequencies and length, we need to measure the exact frequencies of each individual half cell of a dumbbell. To improve such a calculation precision and to simplify the calculation formulae, based on a two-coupled oscillator model and a cavity perturbation theory, a new formula to calculate the individual half-cell frequencies of a dumbbell or the individual cavity frequencies of a two-cavity coupling system has been developed, and its performance has been confirmed by using a dumbbell simulation. This formula can be applied to any kind of rf cavities with electric, magnetic, or electromagnetic coupling, if a coupling hole between two coupling cavities is small compared to the wavelength. Compared to other calculation formulae, this formula simplifies the calculation process of the individual resonator frequencies of a coupling system considerably, and it can also improve the calculation precision than that of a normal calculation method. Another advantage of this new method is that we do not need to consider a coupling factor between two resonators during a testing for an individual resonator frequency of an oscillator. The developed formula has been successfully used to tune the PEFP dumbbells.


Related Articles

  • A nuclear magnetic resonance spectrometer for operation around 1 MHz with a sub-10-mK noise temperature, based on a two-stage dc superconducting quantum interference device sensor. Levitin, L. V.; Bennett, R. G.; Casey, A.; Cowan, B. P.; Lusher, C. P.; Saunders, J.; Drung, D.; Schurig, Th. // Applied Physics Letters;12/24/2007, Vol. 91 Issue 26, p262507 

    We have developed a nuclear magnetic resonance spectrometer with a series tuned input circuit for measurements on samples at millikelvin temperatures based on an integrated two-stage superconducting quantum interference device current sensor, with an energy sensitivity...

  • Operation of high-sensitivity radio frequency superconducting quantum interference device.... Zhang, Y.; Zander, W. // Applied Physics Letters;8/4/1997, Vol. 71 Issue 5, p704 

    Presents a high temperature superconductor coplanar resonator for the operation of high-sensitivity radio frequency washer superconducting quantum interference devices. Diameter of coplanar lines surrounding the circular flux concentrator washer; Composition of the device parts; Resonant...

  • Thermal calculation of accelerating structures in electron linacs. Gusarova, M.; Kostin, R.; Lalayan, M.; Savin, E.; Sobenin, N.; Tikhonov, D. // Technical Physics;Apr2013, Vol. 58 Issue 4, p601 

    The temperature distribution in the accelerating structures of standing-wave and traveling-wave electron linacs is calculated. The objects of consideration in the former and latter cases are, respectively, a circular iris waveguide with magnetic coupling and a biperiodic accelerating structure....

  • Electric-field-induced ferromagnetic resonance excitation in an ultrathin ferromagnetic metal layer. Nozaki, Takayuki; Shiota, Yoichi; Miwa, Shinji; Murakami, Shinichi; Bonell, Frédéric; Ishibashi, Shota; Kubota, Hitoshi; Yakushiji, Kay; Saruya, Takeshi; Fukushima, Akio; Yuasa, Shinji; Shinjo, Teruya; Suzuki, Yoshishige // Nature Physics;Jun2012, Vol. 8 Issue 6, p492 

    Using resonant phenomena to exert coherent control over electron spin dynamics could enable more-energy-efficient spintronic devices and related technologies. Yet, achieving collective spin resonant control by ferromagnetic resonance excitation most often requires radiofrequency magnetic fields...

  • Nanoscale constrictions in superconducting coplanar waveguide resonators. Jenkins, Mark David; Naether, Uta; Ciria, Miguel; Sesé, Javier; Atkinson, James; Sénchez-Azqueta, Carlos; del Barco, Enrique; Majer, Johannes; Zueco, David; Luis, Fernando // Applied Physics Letters;10/20/2014, Vol. 105 Issue 16, p1 

    We report on the design, fabrication, and characterization of superconducting coplanar waveguide resonators with nanoscopic constrictions. By reducing the size of the center line down to 50 nm, the radio frequency currents are concentrated and the magnetic field in its vicinity is increased. The...

  • SEGMENTED MAGNETIC ANTENNAS FOR NEAR-FIELD UHF RFID. Dobkin, Daniel M.; Weigand, Steven M.; Iyer, Nathan // Microwave Journal;Jun2007, Vol. 50 Issue 6, p96 

    A simple loop antenna of less-than-resonant size is awkward to match and a resonant antenna contains opposing current flows and makes a poor magnetic antenna. Segmented antennas have been constructed that can operate at resonant diameters while still providing good magnetic coupling.

  • High-Frequency Electromagnetic Field Coupling to Small Antennae in a Rectangular Resonator. Tkachenko, Sergey; Nitsch, Jürgen; Al-Hamid, Moawia // International Journal of Antennas & Propagation;2012, p1 

    The integral-differential equation for the current of an electrically small antenna, inside a resonator, which is induced by given sources, is approximately solved by the so-called "Method of Small Antenna," both for dipole and loop antennas. The current induced in the antenna is evaluated using...

  • Intermodulation measurements in Nb superconducting microstrip resonators. Monaco[a], R.; Androone, A.; Palomba, F. // Journal of Applied Physics;9/1/2000, Vol. 88 Issue 5, p2898 

    Discusses the issue of intermodulation distortion in superconducting devices for radio frequency and microwave applications. Application of the classical frequency conversion theory for nonlinear two-port devices in the small signal limit to microstrip resonators; Dependence of the surface...

  • As-grown preparation of high-critical-temperature superconducting Y1Ba2Cu3O7-x films by radio-frequency plasma flash evaporation. Terashima, Kazuo; Akagi, Tatsuya; Komaki, Hisashi; Yoshida, Toyonobu // Journal of Applied Physics;4/1/1992, Vol. 71 Issue 7, p3427 

    Provides information on a study that reported as-grown preparations of Y[sub1]Ba[sub2Cup[sub3]O[sub7-x] films by radio frequency plasma evaporation. Details on the experiment; Results and discussion; Conclusions.


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics