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2017-01-10
08:55
OpenAccess [PUBDB-2017-00386] Journal Article
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Production of Superconducting 1.3-GHz Cavities for the European X-Ray Free Electron Laser
ddc:530
The production of over 800 1.3-GHz superconducting (SC) cavities for the European X-ray Free Electron Laser (EXFEL), the largest in the history of cavity fabrication, has now been successfully completed. In the past, manufacturing of SC resonators was only partly industrialized; the main challenge for the EXFEL production was transferring the high-performance surface treatment to industry. [...]
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2016-02-02
16:09
[PUBDB-2016-00859] Contribution to a conference proceedings
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Thermal, Electrical Properties and Microstructure of High Purity Niobium for High Gradient Superconducting Cavities
20th International Cryogenic Engineering Conference, ICEC20, Meeting locationBeijing, China, 11 May 2004 - 14 May 20042004-05-112004-05-14
495-498 (2004)
For controlling niobium properties for the fabrication of superconducting cavity, the system for quick measurement of Nb thermal conductivity and residual ratio RRR are created. Thermal conductivity test can be done in a 100 l transport liquid helium tank. [...]

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2016-01-14
11:27
[PUBDB-2016-00288] Journal Article
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Mechanical properties of niobium radio-frequency cavities
ddc:600
Radio-frequency cavities made of bulk niobium are one of the components used in modern particle accelerators. The mechanical stability is an important aspect of cavity design, which typically relies on finite-element analysis simulations using material properties from tensile tests on sample. [...]

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2015-12-22
17:29
OpenAccess [PUBDB-2015-06204] Conference Presentation
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ILC-HiGrade cavities as a tool of quality control for the EXFEL and further SRF R&D
DPG 2015, Meeting locationWuppertal, Germany, 9 Mar 2015 - 13 Mar 20152015-03-092015-03-13
The order for superconducting radio-frequency (SRF) cavities for the European XFEL includes an additional set of 24 cavities which are part of the ILC-HiGrade program. Initially, these cavities serve as quality control (QC) sample extracted in parallel to the EXFEL cavities series production on a regular basis. [...]
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2015-12-22
16:57
OpenAccess [PUBDB-2015-06199] Contribution to a conference proceedings
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Study of the evolution of artificial defects on the surface of niobium during electrochemical and chemical polishing
17th International Conference on RF Superconductivity, SRF2015, Meeting locationWhistler, Canada, 13 Sep 2015 - 18 Sep 20152015-09-132015-09-18
5 pp. (2015)
The presence of defects on the inner surface of Nbsuperconducting RF structures might limit its finalperformance. For this reason, strict requirements areimposed during mechanical production of the cavities,specifically on the quality control of the inner surface ofcomponents, to avoid the presence of defects or scratches.Nevertheless, some defects may remain also after controlor can arise from the following production steps.Understanding the evolution of the defect might shinenew insight on its origin and help in defining possiblerepair techniques.This paper reports the topographical evolution ofdefects on a Nb sample polished with the standard recipeused for the 1.3 GHz cavities of the EXFEL project.Various artificial defects of different shape, dimensions,and thicknesses/depths, with geometrical characteristicssimilar to the one that may occur during the machiningand handling of cavities, have been “ad hoc” produced onthe sample of the same material used for the cellfabrication. [...]
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2015-12-17
20:12
Embargoed OpenAccess [PUBDB-2015-06018] Journal Article
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Superconducting cavity material for the European XFEL
ddc:530
Analysis of the strategy for superconducting cavity material procurement and qualitymanagement is done on the basis of the experience with the cavity production for the Europeanx-ray free electron laser (EXFEL) facility. An adjustment of the material specification to EXFELrequirements, procurement of material, quality control (QC), documentation, and shipment tocavity producers have been worked out and carried out by DESY. [...]
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2015-12-17
19:10
[PUBDB-2015-06016] Contribution to a conference proceedings/Journal Article
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Review of R&D at DESY on ingot niobium for accelerators
Proceedings - , 2015. - ISBN - doi:10.1063/1.4935324
JLab Ingot Niobium CRADA Workshop, Meeting locationNewport News, Virginia, USA, 4 Dec 2015 - 4 Dec 20152015-12-042015-12-04
AIP conference proceedings (2015) [10.1063/1.4935324]  GO
ddc:530
An R&D program at DESY exploring the potential of the production of 1.3 GHz TESLA shape cavities from large grain or ingot niobium material has been carried out as a feasibility study for using ingot niobium material for the European X-ray Free-Electron Laser project. The most important issues like feasibility of the fabrication of niobium discs from ingots, material properties, cavity fabrication, treatment, and finally the cryogenic radiofrequency (RF) performance of the cavity in the accelerator modules are presented and discussed. [...]
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2015-11-24
15:36
OpenAccess [PUBDB-2015-05039] Poster
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SRF Gun Cavity R&D at DESY
17th International Conference on RF Superconductivity, SRF2015, Meeting locationWhistler, DESY, National Centre for Nuclear Research Otwock-Swierk, Canada, 13 Sep 2015 - 18 Sep 20152015-09-132015-09-18
SRF Gun Cavity is an ongoing accelerator R&D Project at DESY, being developed since several years. Currently several SRF gun cavity prototypes were simulated, built and tested in our Lab and elsewhere. [...]

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2015-11-24
14:44
OpenAccess [PUBDB-2015-05029] Poster
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Practical Aspects of HOM Suppression Improvement for TM011
17th International Conference on RF Superconductivity, SRF2015, Meeting locationWhistler, DESY, ZANON SPA, Canada, 13 Sep 2015 - 18 Sep 20152015-09-132015-09-18
Some Higher Order Modes (HOM) pass bands were controlled during cryo-tests at DESY for the European XFEL cavities. The second monopole mode (TM011) showed most instabilities and suppression degradation. [...]

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2015-06-04
09:00
OpenAccess [PUBDB-2015-02191] Journal Article
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Hydroforming of Elliptical Cavities
ddc:530
Activities of the past several years in developing the technique of forming seamless (weldless) cavity cells by hydroforming are summarized. An overview of the technique developed at DESY for the fabrication of single cells and multicells of the TESLA cavity shape is given and the major rf results are presented. [...]
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