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At Helmholtz Zentrum Berlin (HZB), it is planned to apply mTCA.4 technology for the LLRF control of two of its accelerator facilities: BESSY-II and SeaLab. BESSY-II is a 3rd generation Synchrotron Light Source in operation since 1998 and focused on the generation of soft X-rays, complementing this way PETRA-III at DESY. It comprises a booster ring with one PETRA-type 500MHz normal conducting cavity and a storage ring with four High Order Mode (HOM) damped 500MHz cavities. In preparation of future upgrades and in order to make the injected bunches shorter, two more PETRA-type cavities have been introduced to the booster ring and are expected to start operation after the summer of 2022. mTCA.4 technology has been chosen to replace the old analogue LLRF systems as well as the development platform for the LLRF control of the recently introduced booster cavities.
A current project to study the possibility to upgrade BESSY-II is also ongoing: BESSY-Variable Pulse-Length Demo (VSR-Demo). The idea underlying VSR-Demo is introducing superconducting high harmonic cavities into the storage ring so different bunch lengths can exist in the storage ring simultaneously. At a first stage, a cryomodule with two 1.5GHz SRF cavities will be tested in the SeaLab bunker and will be controlled using mTCA.4 systems.
SeaLab (formely known as bERLinPro) for the moment incorporates a Superconducting RF Photoinjector module, a three superconducting two-cell cavity Booster module in the injector line and a Transverse Deflecting Cavity in the straight diagnostic line for bunch length and sliced emittance measurements. The mTCA equipment is distributed between powerful server CPU controlling Gun and 3 Booster instances and the TCav is distinguished into the standalone crate under AMC CPU control. The system is driven by precise Timing and synchronization system and has a Machine protection system on-board. Number of works are conducting to ensure the project commissioning planned for year 2022.
Finally, HZB also operates the Metrology Light Source (MLS) owned by the Physikalisch Technische Bundesanstalt (PTB) where it is also planned to upgrade its old analogue LLRF system using mTCA.4.
