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2019-12-23
13:21
[PUBDB-2019-05660] Conference Presentation
et al
Status of FLASH RF Systems, Recent Progress and Near Future Upgrades
Low-Level Radio Frequency Workshop 2019, LLRF19, ChicagoChicago, USA, 29 Sep 2019 - 3 Oct 20192019-09-292019-10-03
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2019-12-03
17:47
[PUBDB-2019-04703] Poster
et al
PITZ Optimization at SRF Gun Gradients
MT ARD ST3 Annual Meeting, GSIDarmstadt, GSI, Germany, 16 Oct 2019 - 18 Oct 20192019-10-162019-10-18
A continuous wave (CW) mode operation of the European XFEL is under studies for a future upgrade. A superconducting RF (SRF) CW gun is under experimental development at DESY in Hamburg. [...]
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2019-11-28
09:21
[PUBDB-2019-04556] Talk (non-conference) (Invited)

XFEL Construction, Commissioning and SRF R&D
SHINE - DESY - KEK Workshop, DESYShanghai, DESY, China, 13 Nov 2019 - 14 Nov 20192019-11-132019-11-14
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2019-11-28
09:15
[PUBDB-2019-04555] Conference Presentation

The European XFEL Construction and First Operation
SHINE Forum 2019, ShanghaiShanghai, China, 24 Apr 2019 - 24 Apr 20192019-04-242019-04-24
The European X-ray Free-Electron Laser (XFEL) in Hamburg, Northern Germany, aims at producing X-rays in the range from 260 eV up to 24 keV out of three undulators that can be operated simultaneously with up to 27,000 pulses per second. The XFEL is driven by a 17.5 GeV superconducting linac. [...]

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2019-11-28
09:11
[PUBDB-2019-04554] Talk (non-conference) (Plenary/Keynote)

AMICI Work Package 3 „Cooperation“
AMICI Third Annual Meeting, DESYParis, DESY, France, 8 Oct 2019 - 10 Oct 20192019-10-082019-10-10
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2019-11-28
09:03
[PUBDB-2019-04553] Conference Presentation

Overview on Future Continuous Wave X-Ray Free Electron Lasers
39th International Free-Electron Laser Conference, FEL19, HamburgHamburg, Germany, 26 Aug 2019 - 30 Aug 20192019-08-262019-08-30
FELs based on superconducting accelerators offer a photon beam time structure being flexible in pulse pattern, with the electron bunch properties tailored to effectively meet user requirements. While DESY's long time operated FLASH facility as well as the in 2017 commissioned European XFEL in the Hamburg region, Germany, are operated in pulsed mode with bunch trains of up to 600 µs and bunch repetition rates of up to 4.5 MHz, new facilities aim for continuous wave (cw) RF operation allowing bunch repetition rates of typically 100 kHz to 1 MHz. [...]
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2019-11-27
16:53
OpenAccess [PUBDB-2019-04550] Contribution to a conference proceedings/Contribution to a book
et al
Nitrogen Infusion Sample R at DESY
19th Int. Conf. on RF Superconductivity, DresdenDresden, Germany, 30 Jun 2019 - 5 Jul 20192019-06-302019-07-05 JACoW Publishing, Geneva, Switzerland 77-82 () [10.18429/JACOW-SRF2019-MOP023]  GO
The European XFEL continuous wave upgrade requires cavities with reduced surface resistance (high Q-values) for high duty cycle while maintaining high accelerating gradient for short-pulse operation. A possible way to meet the requirements is the so-called nitrogen infusion procedure. [...]
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2019-11-22
14:37
OpenAccess [PUBDB-2019-04439] Contribution to a conference proceedings

Overview of CW RF Guns for Short Wavelength FELs
39th International Free-Electron Laser Conference, FEL19, HamburgHamburg, Germany, 26 Aug 2019 - 30 Aug 20192019-08-262019-08-30 JACoW Publishing, Geneva, Switzerland 290-296 () [10.18429/JACOW-FEL2019-WEA01]  GO
Hard X-ray FELs (XFELs) operating with pulsed RF provide unprecedented peak brilliance for scientific research. Operating the accelerators with CW RF improves the flexibility w.r.t. [...]
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2019-11-22
12:54
OpenAccess [PUBDB-2019-04428] Contribution to a conference proceedings
et al
PITZ Experimental Optimization for the Aimed Cathode Gradient of a Superconducting CW RF Gun
39th International Free-Electron Laser Conference, FEL19, HamburgHamburg, Germany, 26 Aug 2019 - 30 Aug 20192019-08-262019-08-30 JACoW Publishing, Geneva, Switzerland 440-443 () [10.18429/JACOW-FEL2019-WEP051]  GO
A continuous wave (CW) mode operation of the European X-ray Free-Electron Laser (XFEL) is under considerations for a future upgrade. Therefore, a superconducting radio frequency (SRF) CW gun is under experimental development at DESY in Hamburg. [...]
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2019-10-11
11:28
[PUBDB-2019-03646] Contribution to a conference proceedings
et al
Higher Order Mode Spectra Study of 3.9 GHz Superconducting Radio Frequency Cavities for the European XFEL
10th International Particle Accelerator Conference, IPAC'19, MelbourneMelbourne, Australia, 19 May 2019 - 24 May 20192019-05-192019-05-24 JACoW Publishing, Geneva, Switzerland 1840-1843 () [10.18429/JACOW-IPAC2019-TUPRB075]  GO
It is important to verify both by simulation and experiments the wakefields in superconducting radio frequency (SRF) cavities, which can degrade the electron beam quality considerably or impose excessive heat load if left undamped. In this paper, we investigate the Higher Order Mode (HOM) spectra of the 3.9 GHz SRF cavities, which are assembled in a cryogenic module and are used to linearize the longitudinal phase space of the electron beam in the injector of the European XFEL. [...]
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