${\hbox{MgB}}_{2}$ for Application to RF Cavities for Accelerators

Tajima, T.; Canabal, A.; Zhao, Yue; Romanenko, A.; Moeckly, B. H.; Nantista, C.; Tantawi, Sami; Phillips, L.; Iwashita, Yoshihisa; Campisi, I.E.

doi:10.1109/tasc.2007.899876

Cited by 22 publications

(17 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This technique allows one to prepare large MgB 2 objects, as it has been demonstrated elsewhere [13]. In particular, a steel tube with an internal diameter of 4 mm has been filled by crystalline B powder of average sizes less than 38 lm (99.5% purity) and the powder has been pressed reaching a packing density of almost 1.4 g/cm 3 . At the ends of the container, two cylinders of Mg have been put in contact with the B powder and the whole system has been subjected to a thermal treatment at 850°C for 3 h. The resulting MgB 2 rod has been machined out of the reaction container to have a diameter of 3.8 mm and a length of 94.3 mm.…”

Section: Coaxial Cavity: Theoretical Aspects and Designmentioning

confidence: 99%

“…Although MgB 2 SC has been indicated by several authors as suitable material for mw application [1][2][3], the frequency dependence of R s in this material has not been comprehensively investigated. Up to now, in the literature there are only few papers discussing results of frequency dependence of R s , obtained mainly in MgB 2 films [4,5].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Frequency dependence of the microwave surface resistance of MgB2 by coaxial cavity resonator

Gallitto

Camarda

Vigni

et al. 2014

Physica C: Superconductivity and its Applications

View full text Add to dashboard Cite

We report on the microwave (mw) properties of a cylindrical MgB2 rod prepared by the reactive liquid Mg infiltration technology. The MgB2 rod, 94.3 mm long, is used as inner conductor of a coaxial cavity having a Cu tube as external conductor. By analyzing the resonance curves of the cavity in the different resonant modes and at different temperatures, we have determined the temperature dependence of the mw surface resistance, Rs, of the MgB2 material, at fixed frequencies, and the frequency dependence of Rs, at fixed temperatures. Our results show that the Rs(f) curves follow a f^n law, where n decreases on increasing the temperature, starting from n=2, at T=4.2 K, down to n=0.7 at T>Tc. The double gap nature of MgB2 manifests itself in the presence of a wide low-T tail in the R(T) curves, which can be ascribed to the quasiparticles thermally excited through the pi gap even at relatively low temperatures

show abstract

Section: Coaxial Cavity: Theoretical Aspects and Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Frequency dependence of the microwave surface resistance of MgB2 by coaxial cavity resonator

Gallitto

Camarda

Vigni

et al. 2014

Physica C: Superconductivity and its Applications

View full text Add to dashboard Cite

show abstract

“…As a result, MgB 2 thin films have been produced and employed in the study of two-gap superconductivity in MgB 2 . Furthermore, the high-quality MgB 2 thin films are very suitable for engineering applications, such as superconducting electronic devices [37] and radio-frequency (RF) cavities [38,39]. For example, Nb-based RF cavity technology is now very close to theoretical limits [38] and high-quality single-crystalline MgB 2 thin films are considered to be the most plausible candidates [39] for meeting the still expanding requirements of accelerator research.…”

Section: Single-crystal Like Mgb 2 Thin Filmsmentioning

confidence: 99%

A review on the understanding and fabrication advancement of MgB₂thin and thick films by HPCVD

Ranot¹,

Duong²,

Bhardwaj³

et al. 2015

Progress in Superconductivity and Cryogenics

View full text Add to dashboard Cite

MgB 2 thin films with superior superconducting properties are very promising for superconducting magnets, electronic devices and coated conductor electric power applications. A clear understanding of flux pinning mechanism in MgB 2 films could be a big aid in improving the performance of MgB 2 by the enhancement of J c . The fabrication advancement and the understanding of flux pinning mechanism of MgB 2 thin and thick films fabricated by using hybrid physical-chemical vapor deposition (HPCVD) are reviewed. The distinct kind of MgB 2 films, such as single-crystal like MgB 2 thin films, MgB 2 epitaxial columnar thick films, and a-axis-oriented MgB 2 films are included for flux pinning mechanism investigation. Various attempts made by researchers to improve further the flux pinning property and J c performance by means of doping in MgB 2 thin films by using HPCVD are also summarized.Keywords: MgB2 thin and thick films, HPCVD, flux pinning mechanism * Corresponding author: email: wnkang@skku.edu A review on the understanding and fabrication advancement of MgB2 thin and thick films by HPCVD CCs showed self-field J c values of the order of 10 7 A/cm 2 at 5 K as high as already obtained in MgB 2 thin films, however, J c decreases in response to an applied magnetic field [31,32]. Therefore, a complete understanding of the flux pinning mechanism could be a big aid in improving the performance of MgB 2 by the enhancement of J c , which is most important parameter in practical applications for an operation with low noise and lower power loss. The epitaxial MgB 2 thin films with uniform orientation of grains provide an ideal condition for investigating the vortex dynamics and flux pinning properties, in contrast to MgB 2 bulk system where grains are randomly orientated. In this article, we review the progress made in the last 14 years for the fabrication, understanding of flux pinning mechanism, and for improving the performance by doping in MgB 2 epitaxial thin and thick films by using HPCVD technique.

show abstract

“…Since the discovery of MgB 2 superconductor with T c ≈ 39 K, several authors have indicated this material as promising for mw applications [5]- [7], looking particularly at the realization of mw cavities for particle accelerators. Still now, several groups investigate the properties of MgB 2 with the aim to demonstrate its suitability for mw applications, particularly in films [8]- [10].…”

Section: Introductionmentioning

confidence: 99%

Microwave Response of Coaxial Cavities Made of Bulk Magnesium Diboride

Gallitto

Camarda

Vigni

et al. 2014

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

Abstract-We report on the microwave properties of coaxial cavities built by using bulk MgB 2 superconductor prepared by reactive liquid Mg infiltration technology. We have assembled a homogeneous cavity by using an outer MgB 2 cylinder and an inner MgB 2 rod and a hybrid cavity by using an outer copper cylinder and the same MgB 2 rod as inner conductor. By the analysis of the resonance curves, in the different resonant modes, we have determined the microwave surface resistance R s of the MgB 2 materials as a function of the temperature and the frequency, in the absence of dc magnetic fields. At T = 4.2 K and f ≈ 2.5 GHz, by an mw pulsed technique, we have determined the quality factor of the homogeneous cavity as a function of the input power up to a maximum level of about 40 dBm (corresponding to a maximum peak magnetic field of about 100 Oe). Contrary to what occurs in many films, R s of the MgB 2 material used does not exhibit visible variations up to an input power level of about 10 dBm and varies less than a factor of 2 on further increasing the input power of 30 dB.

show abstract

${\hbox{MgB}}_{2}$ for Application to RF Cavities for Accelerators

Cited by 22 publications

References 14 publications

Frequency dependence of the microwave surface resistance of MgB2 by coaxial cavity resonator

Frequency dependence of the microwave surface resistance of MgB2 by coaxial cavity resonator

A review on the understanding and fabrication advancement of MgB₂thin and thick films by HPCVD

Microwave Response of Coaxial Cavities Made of Bulk Magnesium Diboride

Contact Info

Product

Resources

About

${\hbox{MgB}}_{2}$ for Application to RF Cavities for Accelerators

Cited by 22 publications

References 14 publications

Frequency dependence of the microwave surface resistance of MgB2 by coaxial cavity resonator

Frequency dependence of the microwave surface resistance of MgB2 by coaxial cavity resonator

A review on the understanding and fabrication advancement of MgB2thin and thick films by HPCVD

Microwave Response of Coaxial Cavities Made of Bulk Magnesium Diboride

Contact Info

Product

Resources

About

A review on the understanding and fabrication advancement of MgB₂thin and thick films by HPCVD