1. Prototype Real-Time ATCA-Based LLRF Control System
- Author
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Tomasz Jezynski, Adam Piotrowski, Pawel Predki, Dariusz Makowski, Waldemar Koprek, Stefan Simrock, Grzegorz Jablonski, Andrzej Napieralski, Krzysztof Czuba, and Wojciech Jalmuzna
- Subjects
Nuclear and High Energy Physics ,Engineering ,business.industry ,Electrical engineering ,Free-electron laser ,Self-amplified spontaneous emission ,DESY ,Linear particle accelerator ,Data acquisition ,Nuclear Energy and Engineering ,Control system ,Radio frequency ,Electrical and Electronic Engineering ,Advanced Telecommunications Computing Architecture ,business - Abstract
The linear accelerators employed to drive Free Electron Lasers (FELs), such as the X-ray Free Electron Laser (XFEL) currently being built in Hamburg, require sophisticated control systems. The Low Level Radio Frequency (LLRF) control system should stabilize the phase and amplitude of the electromagnetic field in accelerating modules with tolerances below 0.02 % for amplitude and 0.01 degree for phase to produce ultra-stable electron beam that meets the conditions required for Self-Amplified Spontaneous Emission (SASE). The LLRF control system of 32-cavity accelerating module of the XFEL accelerator requires acquisition of more than 100 analogue signals sampled with frequency around 100 MHz. Data processing in real-time loop should complete within a few hundreds of nanoseconds. Moreover, the LLRF control system should be reliable, upgradable and serviceable. The Advanced Telecommunications Computing Architecture (ATCA) standard, developed for telecommunication applications, can fulfil all of the above mentioned requirements. The paper presents the architecture of a prototype LLRF control system developed for the XFEL accelerator. The control system composed of ATCA carrier boards with Rear Transition Modules (RTM) is able to supervise 32 cavities. The crucial submodules, like DAQ, Vector Modulator or Timing Module, are designed according to AMC specification. The paper discusses results of the LLRF control system tests that were performed at the FLASH accelerator (DESY, Hamburg) during machine studies.
- Published
- 2011