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2018-01-11
13:36
DBCoverage [PUBDB-2018-00489] Journal Article
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Validation of the superconducting 3.9 GHz cavity package for the European X-ray Free Electron Laser
ddc:530
A full test of the cavity package concept under realistic operating condition was a necessary step before the assembly of the European XFEL (EXFEL) 3.9 GHz superconducting system and its installation in the accelerator. One cavity, equipped with magnetic shielding, power coupler and frequency tuner has been tested in a specially designed single cavity cryostat in one of the test benches of the DESY Accelerator Module Test Facility (AMTF). [...]
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2017-12-21
16:03
OpenAccess [PUBDB-2017-13971] Contribution to a conference proceedings/Contribution to a book
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Limits for the Operation of the European XFEL 3.9 GHz System in CW Mode
8th International Particle Accelerator Conference, IPAC2017, Meeting locationCopenhagen, Denmark, 14 May 2017 - 19 May 20172017-05-142017-05-19 JACoW, 1023-1026 (2017) [10.3204/PUBDB-2017-13971]  GO
Future upgrades of the European XFEL (EXFEL) facility may require driving the linac at higher duty factor, possibly extending to CW mode at reduced gradients. A preliminary analysis for the accelerator modules has been presented in the EXFEL TDR, but no precise assessment has been performed so far for the present 3.9 GHz system design. [...]
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2017-12-18
16:19
OpenAccess [PUBDB-2017-13659] Talk (non-conference) (Invited)
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European XFEL Procurement Strategy – Lessons Learned
TTC Meeting February 2017, Meeting locationEast Lansing, Michigan State University, USA, 21 Feb 2017 - 24 Feb 20172017-02-212017-02-24  GO
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2017-12-18
15:27
OpenAccess [PUBDB-2017-13655] Conference Presentation
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The Commissioning of the European-XFEL Linac and its Performance
18th International Conference on RF Superconductivity, SRF2017, Meeting locationLanzhou, China, 17 Jul 2017 - 21 Jul 20172017-07-172017-07-21  GO
The main linac of the superconducting accelerator of the European XFEL presently consists of 96 accelerator modules, each housing eight 1.3 GHz TESLA-type cavities, with an average design gradient of 23.6 MV/m. The performance of each individual module has been tested after module assembly in the Accelerator Module Test Facility (AMTF) at DESY. [...]
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2017-12-18
15:13
OpenAccess [PUBDB-2017-13653] Contribution to a conference proceedings
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The Commissioning of the European-XFEL Linac and its Performance
18th International Conference on RF Superconductivity, SRF2017, Meeting locationLanzhou, China, 17 Jul 2017 - 21 Jul 20172017-07-172017-07-21 Geneva : JACoW, 100-105 (2017) [10.3204/PUBDB-2017-13653]  GO
The main linac of the superconducting accelerator of the European XFEL presently consists of 96 accelerator modules, each housing eight 1.3 GHz TESLA-type cavities, with an average design gradient of 23.6 MV/m. The performance of each individual module has been tested after module assembly in the Accelerator Module Test Facility (AMTF) at DESY. [...]
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2017-12-14
11:29
OpenAccess [PUBDB-2017-13474] Journal Article
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Fabrication and Vertical Test Experience of the European X-ray Free Electron Laser 3.9 GHz Superconducting Cavities
ddc:530
We report the experience of the production, processing and qualification testing of the superconducting radio frequency cavities at 3.9 GHz for the third harmonic system at the European XFEL (EXFEL) injector. The rf structure concept, originally developed for the FLASH FEL facility, was adapted to the new interfaces provided by the EXFEL design and the cavities were procured from a qualified vendor, delivered ready for the testing at the INFN infrastructure [...]
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2017-11-28
06:00
OpenAccess [PUBDB-2017-12412] Contribution to a conference proceedings/Contribution to a book
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Commissioning of the European XFEL Accelerator
8th International Particle Accelerator Conference, IPAC2017, Meeting locationCopenhagen, Denmark, 14 May 2017 - 19 May 20172017-05-142017-05-19 Geneva : JACoW, 6 pp. (2017) [10.18429/JACoW-IPAC2017-MOXAA1]  GO
The European XFEL uses the world's largest superconducting RF installation to drive three independent SASE FELs. After eight years of construction the facility is now brought into operation. [...]
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2017-11-21
11:47
OpenAccess [PUBDB-2017-12185] Contribution to a conference proceedings/Contribution to a book
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Commissioning and Operation Experience of the 3.9 GHz System in the EXFEL Linac
8th International Particle Accelerator Conference, IPAC2017, Meeting locationCopenhagen, Denmark, 14 May 2017 - 19 May 20172017-05-142017-05-19 999-1002 (2017) [10.3204/PUBDB-2017-12185]  GO
The European X-ray Free Electron Laser (EXFEL) injector linac hosts a 3.9~GHz module (AH1) for beam longitudinal phase space manipulation after the first acceleration stage, in order for the linac to deliver the high current beams with sufficiently low emittance for the production of 1 Angstrom FEL light to the experimental users. The module was technically commissioned in December 2015 and operated well above its nominal performances during the Injector Run from January to July 2016. [...]
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2017-11-16
15:27
OpenAccess [PUBDB-2017-12065] Contribution to a conference proceedings
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A New High Resolution Optical System for Inspection of Gun- and Multi-Cell Resonators in ISO-4 Cleanrooms
18th International Conference on RF Superconductivity, SRF2017, Meeting locationLanzhou, China, 17 Jul 2017 - 21 Jul 20172017-07-172017-07-21 Geneva : Jacow, 1-4 (2017) [10.3204/PUBDB-2017-12065]  GO
Optical inspection of the inner surface of superconducting resonators was established during European XFEL cavity production by usage of the so called OBACHT optical inspection [1]. In addition to the surface inspection by OBACHT a new optical inspection system with integrated high resolution camera is set up at DESY. [...]
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2017-11-16
15:02
OpenAccess [PUBDB-2017-12064] Poster
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Experience on In-Situ Module Repair and Set up of Non XFEL Cavity Strings at DESY
18th International Conference on RF Superconductivity, SRF2017, Meeting locationLanzhou, China, 17 Jul 2017 - 21 Jul 20172017-07-172017-07-21  GO
All components installed to the European XFEL cavity string modules underwent an intensive inspection and quality control before acceptance for installation to cavities or modules. Even though some RF feed throughs for HOM coupler- and Pick Up antennas showed leaks at the ceramic insulation after module test at 2 K. [...]
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