Improved Vector Modulator Card for MTCA-based LLRF Control System for Linear Accelerators
Igor Rutkowski , Krzysztof Marek Czuba , Maciej Grzegrzółka , H. Schlarb , D Makowski , A. Mielczarek , P. Perek
AbstractModern linear accelerators require a high-precision RF field regulation of accelerating cavities. A critical compo- nent to achieve high-precision in the feedback loop of a Low Level Radio Frequency (LLRF) controller is the vec- tor modulator driving the high power RF chain. At FLASH, the Free Electron Laser in Hamburg and European XFEL, the LLRF controls are based on MTCA.4 platform. This paper describes the concept, design, and performance of an improved vector modulator module (DRTM-VM02). It is constructed as a Rear Transition Module (RTM). The module consists of digital, analog, diagnostic, and management subsystems. A FPGA from Xilinx Spartan 6 family receives data from a control module (AMC) using Multi-Gigabit Transceivers (MGTs). The FPGA controls the analog part, which includes fast, high-precision DACs, I/Q modulator chips, programmable attenuators, power amplifier, and fast RF gates for an ex- ternal interlock system. Pin assignment on the Zone3 con- nector is compliant with digital class D1.2 recommenda- tions proposed by DESY. The design has been optimized for mass production and can be easily extended to a wider frequency range. Electronic switches offer software con- figuration of power and clock sources.
|Publication size in sheets||0.3|
|Book||Zhimin Dai, Petit-Jean-Genaz Christine, Schaa Volker RW , Zhang Chuang (eds.): Proceedings of the 4th International Particle Accelerator Conference, 2013, Geneva, Switzerland: , JACoW — cc Creative Commons Attribution, ISBN 978-3-95450-122-9, 3999 p.|
|Score|| = 10.0, 24-05-2020, BookChapterMatConfByIndicator|
= 15.0, 24-05-2020, BookChapterMatConfByIndicator
|Publication indicators||= 11; = 5.0|
|Citation count*||5 (2020-08-28)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.