Superconducting TESLA cavities

Aune, B.; Bandelmann, R.; Bloess, D.; Bonin, Bernard; Bosotti, A.; Champion, M.; Crawford, Christopher; Deppe, G.; Dwersteg, B.; Edwards, D. A.; Edwards, H.; Ferrario, M.; Fouaidy, M.; Gall, P. D.; Gamp, A.; Gössel, A.; Graber, Joel H.; Hubert, Dalby Dienstbach; Hüning, M.; Juillard, Michel; Junquera, T.; Kaiser, H.; Kreps, Gary L.; Kuchnir, M.; Lange, R.; Leenen, M.; Liepe, Matthias; Lilje, L.; Matheisen, A.; Möller, W.-D.; Mosnier, A.; Padamsee, H.; Pagani, C.; Pekeler, M.; Peters, H.-B.; Peters, O.; Proch, D.; Rehlich, K.; Reschke, D.; Safa, H.; Schilcher, T.; Schmüser, Peter; Sekutowicz, J.; Simrock, Stefan; Singer, W.; Tigner, M.; Trines, D.; Twarowski, K.; Weichert, G.; Weisend, J. G.; Wojtkiewicz, Jacek; Wolff, S.; Zapfe, K.

doi:10.1103/physrevstab.3.092001

Cited by 347 publications

(277 citation statements)

References 11 publications

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“…19 Table I and preparation techniques. We performed vertical RF tests of these cavities, measuring the quality factor Q 0 as a function of field at many temperatures, as well as the low-field Q 0 and resonant frequency f 0 as a function of bath temperature T 0 .…”

Section: B Experimental Proceduresmentioning

confidence: 99%

The importance of the electron mean free path for superconducting radio-frequency cavities

Maniscalco

Gonnella

Liepe

2017

Journal of Applied Physics

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Impurity-doping is an exciting new technology in the field of SRF, producing cavities with record-high quality factor Q 0 and BCS surface resistance that decreases with increasing RF field. Recent theoretical work has offered a promising explanation for this anti-Q-slope, but the link between the decreasing surface resistance and the short mean free path of doped cavities has remained elusive. In this work we investigate this link, finding that the magnitude of this decrease varies directly with the mean free path: shorter mean free paths correspond with stronger anti-Q-slopes. We draw a theoretical connection between the mean free path and the overheating of the quasiparticles, which leads to the reduction of the anti-Q-slope towards the normal Q-slope of long-mean-free-path cavities. We also investigate the sensitivity of the residual resistance to trapped magnetic flux, a property which is greatly enhanced for doped cavities, and calculate an optimal doping regime for a given amount of trapped flux.

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Section: B Experimental Proceduresmentioning

confidence: 99%

The importance of the electron mean free path for superconducting radio-frequency cavities

Maniscalco

Gonnella

Liepe

2017

Journal of Applied Physics

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“…The existence of the decoherent mechanism can make the energy exchange between the atoms and the magnetic field weaker until it disappears. Nowadays, researchers seek a variety of ways to reduce the influence of cavity EM such as reducing the volume [99], coating [100], and superconductivity of cavity [101] to increase the coherence interaction intensity. When this coherent mechanism is dominated rather than the decoherent mechanism, we usually called it the strong coupling.…”

Section: Quantum Cavity Electrodynamicsmentioning

confidence: 99%

Exciton-plasmon coupling interactions: from principle to applications

et al. 2017

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Abstract:The interaction of exciton-plasmon coupling and the conversion of exciton-plasmon-photon have been widely investigated experimentally and theoretically. In this review, we introduce the exciton-plasmon interaction from basic principle to applications. There are two kinds of exciton-plasmon coupling, which demonstrate different optical properties. The strong exciton-plasmon coupling results in two new mixed states of light and matter separated energetically by a Rabi splitting that exhibits a characteristic anticrossing behavior of the exciton-LSP energy tuning. Compared to strong coupling, such as surface-enhanced Raman scattering, surface plasmon (SP)-enhanced absorption, enhanced fluorescence, or fluorescence quenching, there is no perturbation between wave functions; the interaction here is called the weak coupling. SP resonance (SPR) arises from the collective oscillation induced by the electromagnetic field of light and can be used for investigating the interaction between light and matter beyond the diffraction limit. The study on the interaction between SPR and exaction has drawn wide attention since its discovery not only due to its contribution in deepening and broadening the understanding of SPR but also its contribution to its application in light-emitting diodes, solar cells, low threshold laser, biomedical detection, quantum information processing, and so on.

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“…The technology developed for TTF is hence adequate for TESLA-500 but considerable improvements are needed for an upgrade of the collider to 800 GeV. A detailed description of the present status of the nine-cell cavity layout, fabrication, preparation and tests can be found in [3].…”

Section: Introductionmentioning

confidence: 99%

Surface superconductivity in niobium for superconducting RF cavities

Casalbuoni

Knabbe²,

Kötzler

et al. 2005

Nuclear Instruments and Methods in Physics Research Section A:

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A systematic study is presented on the superconductivity (sc) parameters of the ultrapure niobium used for the fabrication of the nine-cell 1.3 GHz cavities for the linear collider project TESLA. Cylindrical Nb samples have been subjected to the same surface treatments that are applied to the TESLA cavities: buffered chemical polishing (BCP), electrolytic polishing (EP), low-temperature bakeout (LTB). The magnetization curves and the complex magnetic susceptibility have been measured over a wide range of temperatures and dc magnetic fields, and also for different frequencies of the applied ac magnetic field. The bulk superconductivity parameters such as the critical temperature T c = 9.26 K and the upper critical field B c2 (0) = 410 mT are found to be in good agreement with previous data. Evidence for surface superconductivity at fields above B c2 is found in all samples. The critical surface field exceeds the Ginzburg-Landau field B c3 = 1.695B c2 by about 10% in BCP-treated samples and increases even further if EP or LTB are applied. From the field dependence of the susceptibility and a power-law analysis of the complex ac conductivity and resistivity the existence of two different phases of surface superconductivity can be established which resemble the Meissner and Abrikosov phases in the bulk: (1) "coherent surface superconductivity", allowing sc shielding currents flowing around the entire cylindrical sample, for external fields B in the range B c2 < B < B coh c3 , and (2) "incoherent surface superconductivity" with disconnected sc domains for B coh c3 < B < B c3 . The "coherent" critical surface field separating the two phases is found to be B coh c3 = 0.81 B c3 for all samples. The exponents in the power law analysis are different for BCP and EP samples, pointing to different surface topologies.

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Superconducting TESLA cavities

Cited by 347 publications

References 11 publications

The importance of the electron mean free path for superconducting radio-frequency cavities

The importance of the electron mean free path for superconducting radio-frequency cavities

Exciton-plasmon coupling interactions: from principle to applications

Surface superconductivity in niobium for superconducting RF cavities

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