Speaker
Description
ALBA Low-Level RF (LLRF) system has provided over a decade reliable operation and has been adopted by other synchrotron facilities. To meet the evolving requirements of ALBA and ALBA-II, a new LLRF system has been developed for the current fundamental RF system and the future active normal conducting harmonic RF system. This new LLRF features FPGA and ADC/DAC µTCA boards designed by Safran, enabling direct 500 MHz signal sampling without down/up-conversion for the main RF system, while it requires an intermediate frequency in the case of the harmonic system performed in the RTM board itself. These enhancements reduce system complexity, minimize noise, and simplify maintenance. Safran also supplies peripheral modules and the Tango device server generator, while ALBA implemented it and developed a new GUI. Upgraded Digital and RF signal front-ends complement the new hardware. The legacy VHDL code has been updated to improve readability and functionality, incorporating advanced features such as octant selection and a harmonic direct feedback selection method. The latter, based on IIR filtering, isolates positive and negative revolution harmonics in the I/Q domain, feeding them back to amplifiers to effectively mitigate transient beam loading caused by the storage ring bunch train gaps. This upgraded LLRF system delivers enhanced performance and greater flexibility to address the future needs of ALBA and ALBA-II.
| Abstract Category | System and Operation |
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