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2018-01-10
09:31
OpenAccess [PUBDB-2018-00305] Report/Journal Article

Higher-Order Mode-Based Cavity Misalignment Measurements at the Free-Electron Laser FLASH
[DESY-18-006, arXiv:1801.02886]
At the Free-Electron Laser in Hamburg (FLASH) and the European X-Ray Free-Electron Laser, superconducting TeV-energy superconducting linear accelerator (TESLA)-type cavities are used for the acceleration of electron bunches, generating intense free-electron laser (FEL) beams. A long rf pulse structure allows one to accelerate long bunch trains, which considerably increases the efficiency of the machine. [...]
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2017-12-30
22:46
OpenAccess [PUBDB-2017-14154] Conference Presentation
et al
Rear-Transition-Module for Higher-Order Modes Diagnostics
6th MicroTCA Workshop for Industry and Research, HamburgHamburg, Germany, 4 Dec 2017 - 7 Dec 20172017-12-042017-12-07  GO
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2017-04-19
10:55
OpenAccess [PUBDB-2017-01694] Contribution to a conference proceedings/Contribution to a book
et al
HOM Characterization for Beam Diagnostics at the European XFEL Injector
International Beam Instrumentation Conference 2016, IBIC2016, BarcelonaBarcelona, Spain, 13 Sep 2016 - 18 Sep 20162016-09-132016-09-18 JACoW 617-620 () [10.18429/JACOW-IBIC2016-WEPG03]  GO
Higher Order Modes (HOM) excited by bunched electron beams in accelerating cavities carry information about the beam position and phase. This principle is used at the FLASH facility, at DESY, for beam position monitoring in 1.3 and 3.9 GHz cavities. [...]
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2016-08-10
13:50
OpenAccess [PUBDB-2016-02922] Journal Article
et al
Simultaneous Operation of Two Soft X-Ray Free-Electron Lasers Driven by One Linear Accelerator
Extreme-ultraviolet to x-ray free-electron lasers (FELs) in operation for scientific applications are up to now single-user facilities. While most FELs generate around 100 photon pulses per second, FLASH at DESY can deliver almost two orders of magnitude more pulses in this time span due to its superconducting accelerator technology. [...]
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2015-12-23
11:03
OpenAccess [PUBDB-2015-06208] Contribution to a conference proceedings
et al
Preparation of the 3.9 GHz System for the European XFEL Injector Commissioning
17th International Conference on RF Superconductivity, SRF2015, WhistlerWhistler, Canada, 13 Sep 2015 - 18 Sep 20152015-09-132015-09-18 1-5 ()
The 3.9 GHz cryomodule and RF system for the XFEL Injector is being assembled and delivered to the underground building in summer 2015, for the injector commissioning in Fall 2015. This contribution outlines the status of the activity and reports the preparation stages of the technical commissioning of the system..
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2014-01-16
10:44
OpenAccess [DESY-2014-00574] Contribution to a conference proceedings
et al
New Design of High Order Modes Electronics in MTCA.4 Standard for FLASH and the European XFEL
2nd International Beam Instrumentation Conference, IBIC2013, OxfordOxford, United Kingdom, 16 Sep 2013 - 19 Sep 20132013-09-162013-09-19
At free-electron linear accelerators, various High Order Modes (HOM) - both monopole and dipole - are excited. Extensive studies at DESY have shown that monitoring and analysis of some of these modes can be used for different applications including Beam Position Monitors (BPMs) and the reduction of wake-fields, the measurement of the beam phase with-respect-to RF signal in cavities, and the measurement of cavity alignment in the 1.3 GHz cryo-modules. [...]
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2013-08-12
13:28
OpenAccess [DESY-2013-00598] Journal Article

Statistical Methods for Transverse Beam Position Diagnostics with Higher Order Modes in Third Harmonic 3.9GHz Superconducting Accelerating Cavities at FLASH
Beam-excited higher order modes (HOM) can be used to provide beam diagnostics. Here we focus on 3.9 GHz superconducting accelerating cavities. [...]
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