ETD/Online Report D. Breton, U. Marconi, S. Luitz WS goals session – Elba Meeting May 31th 2010 ETD/Online - SuperB Elba Workshop - May 2010

Technical choices for the TDR : front-end There is a certain amount of common questions for the different front-end electronics: Radiation We need a radiation map in order to fix the rules for the electronics mitigation We have to be sure that the technologies chosen can handle radiation We have to define rules for selecting the commercial components Power supplies Do we intend to use radiation-tolerant supplies on the detector (short cables but more expensive supplies) or remote standard supplies (cheaper supplies but long cables) ? Do we want a common supply policy at the detector level ? Grounding and shielding We have to define the rules Our preference is a strong common ground Electronics integration on the detector When designing the system, it is important to think of: How easy it will be to change a board (access, connectors, …) Ensuring there will be no extra pressure on the connectors (for instance avoiding using connectors to mechanically hold boards ETD/Online - SuperB Elba Workshop - May 2010

Technical choices for the TDR : trigger Baseline: re-implement BaBar L1 trigger with some improvements Shorter latency (~4us instead of 12us) Higher sampling frequencies (DCH and EMC) 2-d map for calorimeter Possible additions SVT trigger Bhabha Veto Challenge To keep the event loss due to dead time below 1% => a maximum of ~70ns “per-event dead time” is allowed in trigger and FCTS Other considerations What goes in L1, what in L3, what’s the optimum? See trigger session (ETD 2) First meeting of “Trigger Interest Group” 150kHz Exponential Inter-arrival time pdf. ETD/Online - SuperB Elba Workshop - May 2010

Technical choices for the TDR : common items (1) FCTS Well on tracks. No major open question. Will most probably be a custom crate (see talk on Wednesday) Links Clock distribution has to be perfectly safe The solution chosen will have to guaranty that clock will always be present despite radiation events Control link We have to validate the commercial chipset for radiation: but it has to be the one we will buy! (actually true for all components) We have to define the command frame length and the reasonable overhead necessary for redundancy We have to define the format of the trigger primitives sent back from the FEE Readout link We have to validate the commercial chipset for radiation We have to refine the link effective payload in order to allow the subsystems to finely tune their number of links ETD/Online - SuperB Elba Workshop - May 2010

Technical choices for the TDR : common items (2) Common FEE We have to define the depth of the derandomizer buffers, located between the latency buffers and the readout links ECS Well on tracks. We take benefit there of the ongoing developments for LHCb. ROM A new R&D has been launched, implying: Building and testing an optical to PCIe interface board to get readout data Writing the Linux drivers for PCIe Evaluating the optimal number of input and output boards which can be hosted in a single mother board Testing the transmission rate/bandwidth achievable by using standard/commercial 10 GbE. ETD/Online - SuperB Elba Workshop - May 2010

Technical choices for the TDR : Online Well under control Event Management and Event Builder Define interaction between FCTS, Event Builder and HLT What information needs to be broadcast to the ROMs, what to the FEE to ensure consistent event build – has implications for FCTS/ROM design All other components of the Online system are expected to be commodity / off-the-shelf Only notional technical choices will be required for the TDR to get to a reasonably accurate estimate of cost and manpower, such as: HLT farm architecture (storage, network) Detector Control System Computing infrastructure for the Online system Data quality monitoring ETD/Online - SuperB Elba Workshop - May 2010