Digital RF Control System for The DESY FLASH Linear Accelerator

Ayvazyan, V.; Brandt, Alexander; Choroba, S.; Petrosyan, G. G.; Rehlich, K.; Simrock, S.; Vetrov, P.

doi:10.1109/eurcon.2007.4400385

Cited by 5 publications

(4 citation statements)

References 2 publications

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“…New x-ray sources, such as free-electron lasers (FELs), also require reflective normal incidence x-ray optics. For example, the Free-electron LASer in Hamburg (FLASH) [7] can now produce intense, coherent, and short x-ray pulses down to 4.15 nm wavelength in the first harmonic [8,9]. The wavelength region between 2.3 and 4.4 nm (between the absorption edges of O and C) is often called the "water window" because of a high absorption contrast between C and water.…”

Section: Introductionmentioning

confidence: 99%

Thermal stability studies of short period Sc/Cr and Sc/B₄C/Cr multilayers

et al. 2014

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The stability of short period Sc/Cr and Sc/B₄C/Cr multilayers was investigated over a large temperature range. The aim was to find a stable reflective coating for an off-axis parabola for focusing x rays from a soft x-ray free-electron laser. Normal incidence reflectivity, surface roughness, and intrinsic stress were investigated as a function of annealing temperature and two samples were also studied with a high-resolution transmission electron microscope (TEM), a scanning TEM, and through electron energy loss spectroscopy (EELS). Interface-engineered Sc/B₄C/Cr multilayers showed increased thermal stability and higher reflectivity as compared to pure Sc/Cr multilayers.

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Section: Introductionmentioning

confidence: 99%

Thermal stability studies of short period Sc/Cr and Sc/B₄C/Cr multilayers

et al. 2014

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“…The amplitude of the excitation and associated frequency spectrum depend strongly on the coupling of the cavities and the mechanical resonance frequencies and their mechanical quality factor. Measurements in FLASH accelerating module show typical excitation amplitudes of the order of 5-10 Hz rms (Schilcher, 1998;Ayvazyan et al, 2007) and frequencies ranging from 0.1 Hz up to a few hundred Hz reflecting the convolution of mechanical resonances with the spectral components of the sources of excitation.…”

Section: Microphonicsmentioning

confidence: 99%

“…A following digital signal processing stage performs the feedback algorithm before the calculated actuator signals are reconverted to analog signals. For the RF control in the FLASH a fully digital system has been implemented and it has several stages of major developments (Simrock et al, 1996;Schilcher, 1998;Ayvazyan et al, 2005Ayvazyan et al, , 2007Ayvazyan et al, , 2010.…”

Section: Llrf Control Implementation At Flashmentioning

confidence: 99%

Digital RF Control System for the Pulsed Superconducting Linear Accelerator

Ayvazyan¹

2012

Free Electron Lasers

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“…The system has to control the phase and amplitude of the electromagnetic field inside the superconducting cavities of the linear accelerator with the accuracy of the order of 0.01% for the amplitude and up to 0.01 in the phase at 1.3 GHz [8], [10]. A digital control system, designed with the application of the state-of-the-art technology, is essential to obtain such a challenging stability of phase and amplitude parameters.…”

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confidence: 99%

High-Speed Data Processing Module for LLRF

Makowski

Mielczarek

Perek

et al. 2015

IEEE Trans. Nucl. Sci.

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Linear accelerators, like the Free-electron LASer in Hamburg (FLASH) or the European X-Ray Free Electron Laser (E-XFEL) take advantage of the digital Low Level Radio Frequency (LLRF) system to control the phase and amplitude of an electromagnetic field inside superconducting cavities. The real-time control LLRF system, processing data within a few microseconds, has to fulfil performance requirements and provide comprehensive monitoring and diagnostics. The AMC-based controller (DAMC-TCK7) board was developed as a general purpose high-performance low-latency data processing unit designed according to the PICMG MTCA.4 spec. The module provides the processing power, data memory, communication links, reference clock, trigger and interlock signals that are required in modern LLRF control systems. The module was originally designed as a cavity field stabilizing controller for standing-wave linear accelerators. However, the application of the board is much wider because it is a general purpose data processing module suitable for systems requiring low latency and high-speed digital signal processing. According to authors' knowledge this is the first MTCA.4 module offering 12.5 Gbps links, unified Zone 3 connectivity and advanced Module Management Controller proposed by DESY. The DAMC-TCK7 card was used as a hardware template for the development of the other AMC modules of the XFEL accelerator's LLRF system. This paper discusses the requirements for the digital real-time data processing module, presents the laboratory performance evaluation and verification in Cryo-Module Test Bench (CMTB) at DESY.Index Terms-Data processing module, high-energy physics, linear accelerator, low level radio frequency control system, micro telecommunications computing architecture, MicroTCA enhancements for rear I/O and precision timing, Zone 3 connector classes.

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Digital RF Control System for The DESY FLASH Linear Accelerator

Cited by 5 publications

References 2 publications

Thermal stability studies of short period Sc/Cr and Sc/B₄C/Cr multilayers

Thermal stability studies of short period Sc/Cr and Sc/B₄C/Cr multilayers

Digital RF Control System for the Pulsed Superconducting Linear Accelerator

High-Speed Data Processing Module for LLRF

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Digital RF Control System for The DESY FLASH Linear Accelerator

Cited by 5 publications

References 2 publications

Thermal stability studies of short period Sc/Cr and Sc/B4C/Cr multilayers

Thermal stability studies of short period Sc/Cr and Sc/B4C/Cr multilayers

Digital RF Control System for the Pulsed Superconducting Linear Accelerator

High-Speed Data Processing Module for LLRF

Contact Info

Product

Resources

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Thermal stability studies of short period Sc/Cr and Sc/B₄C/Cr multilayers

Thermal stability studies of short period Sc/Cr and Sc/B₄C/Cr multilayers