Surface investigation on prototype cavities for the European X-ray Free Electron Laser

Singer, W.; Singer, X.; Aderhold, Sebastian; Ермаков, А.; Twarowski, K.; Crooks, R.; Hoss, M.; Scholz, Frank; Spaniol, B.

doi:10.1103/physrevstab.14.050702

Cited by 11 publications

(14 citation statements)

References 2 publications

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“…It appears that the craters could be responsible for the performance degradation in many cells. The cause of such craters is now being discussed worldwide and seems not be specific to LG cavities only (see for example [22]). It is difficult to say whether the LG grain surface behaves in an unusual manner during EP treatment compared to fine grain.…”

Section: Nine-cell Lg Cavities Epmentioning

confidence: 98%

Development of large grain cavities

Singer

Aderhold

Ермаков

et al. 2013

Phys. Rev. ST Accel. Beams

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DESY activities on 1.3 GHz tesla shape single cell and nine-cell large grain (LG) resonators are presented; results of the past five years are covered. The R&D program explores the potential for production of elliptical superconducting cavities. The main efforts have been devoted to material investigation, development of LG disk production, cavity fabrication from this material, and a search for appropriate treatment. More than 250 LG disks are manufactured; several single cell and 11 nine-cell resonators are produced and rf tested after buffered chemical polishing and after additional electropolishing. A maximum accelerating gradient of approximately 45 MV=m for this type of cavity was achieved in two resonators. Two of the LG cavities have been installed and are currently being used in the FLASH accelerator operation. Assembly of a cryomodule, consisting of LG cavities only, is in the works. Perspectives of the LG cavity application are discussed.

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Section: Nine-cell Lg Cavities Epmentioning

confidence: 98%

Development of large grain cavities

Singer

Aderhold

Ермаков

et al. 2013

Phys. Rev. ST Accel. Beams

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“…[12][13][14][15] Currents crossing the joint between two superconducting walls encounter a discontinuity due to microscopic voids, oxides or other surface impurities. Therefore, the types of cavities that are commonly used in cQED experiments 6 are designed to mitigate seam losses (Fig.…”

Section: The Seam As a Loss Mechanism In Cavity Resonatorsmentioning

confidence: 99%

Demonstration of superconducting micromachined cavities

Brecht

Reagor

Chu

et al. 2015

Applied Physics Letters

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Superconducting enclosures will be key components of scalable quantum computing devices based on circuit quantum electrodynamics (cQED). Within a densely integrated device, they can protect qubits from noise and serve as quantum memory units. Whether constructed by machining bulk pieces of metal or microfabricating wafers, 3D enclosures are typically assembled from two or more parts. The resulting seams potentially dissipate crossing currents and limit performance. In this Letter, we present measured quality factors of superconducting cavity resonators of several materials, dimensions and seam locations. We observe that superconducting indium can be a low-loss RF conductor and form low-loss seams. Leveraging this, we create a superconducting micromachined resonator with indium that has a quality factor of two million despite a greatly reduced mode volume. Inter-layer coupling to this type of resonator is achieved by an aperture located under a planar transmission line. The described techniques demonstrate a proof-of-principle for multilayer microwave integrated quantum circuits for scalable quantum computing.

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“…It appears that the craters may be responsible for performance degradation in all cells. Similar craters were discovered in the fine grain cavity Z110 (with similar Eacc) that correlated with the quench location detected by the T-map [10]. The cause of such craters is now being discussed, not only at DESY, but worldwide.…”

Section: Preparation and Rf Testsmentioning

confidence: 70%

Advances in Large Grain Resonators for the European XFEL

Singer¹,

Aderhold²,

Iversen³

et al. 2011

AIP Conference Proceedings

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An overview of the activities within the DESY test program of 1.3 GHz TESLA shape 9-cell Large Grain (LG) resonators for the European XFEL, which have taken place in last 4 years, is presented. Attention is devoted to development of LG disc production and cavity fabrication from this material, focusing in particular on aspects of production at reasonable accuracy and costs. More than 200 LG discs were manufactured, eleven 9-cell resonators produced, partially treated at the company Research Instruments (RI) (former ACCEL) and finally treated and RF tested at DESY. Two of the LG cavities are currently used in the FLASH accelerator operation, which is the best demonstration of the feasibility of the LG application. The program compares large grain material with standard sheet niobium. Some data and perspectives of the LG application are discussed.

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Surface investigation on prototype cavities for the European X-ray Free Electron Laser

Cited by 11 publications

References 2 publications

Development of large grain cavities

Development of large grain cavities

Demonstration of superconducting micromachined cavities

Advances in Large Grain Resonators for the European XFEL

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