An upgrade solution for Belle II DAQ system

The Belle II experiment has just started data acquisition in May 2018 which pushes the upgrade of the DAQ system into action. The Present system is based on the Belle2link system which collects the digitized data in each of the Front End electronics of detector systems and moves them to the COPPER( Common readout Platform) readout. Data from COPPER system will be sent to readout PC via network switch for data packing and processing. To meet the further requirement in the future higher luminosity SuperKEKB running, a discussion for a DAQ upgrade is underway to keep the Belle2link functionalities but replace the COPPER readout by new technology. This talk presents a solution for this upgrade based on a MicroTCA compatible CPPF+ module developed for CMS trigger phase I upgrade. In this solution the FEE part of Belle2link will be kept so that there is no need to change the FEE electronics hardware and firmware at all for all functionalities including the slow control.The back-end part of Belle2link implemented in the HSLB(High Speed receiver Link Board) daughter card of COPPER board will be reimplemented in the CPPF+ board, which provides powerful data concentration and processing, providing output capabilities of up to 10Gbps network bandwidth. The slow control will be done via another PC which is connected to MCH shelf manager. The advantage of this solution is that the transition from present to the upgrade system is smooth as we can share most of the Belle2link back-end firmware in HSLB, and the xTCA platform provides much higher scalability, re-configurability, and reliabilities.