Bulletin of the American Physical Society
6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Sunday–Friday, November 26–December 1 2023; Hawaii, the Big Island
Session 4WCB: Data Acquisition System IIInvited Workshop
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Chair: Martin Purschke, Brookhaven National Laboratory Room: Hilton Waikoloa Village Kings 3 |
Monday, November 27, 2023 4:00PM - 4:30PM |
4WCB.00001: Online data processing using hardware accelerators for nuclear physics experiments Invited Speaker: Taku Gunji One of the recent trends of the data acquisition systems used in high-energy physics experiments and nuclear physics experiments is to employ the free-streaming data acquisition system in order to run the experiments under higher beam intensities and collision rates. As a result, to cope with the increased data rate, tremendous amounts of data sent from detectors needs to be processed online faster and more efficiently to achieve the required compression factors to fit the data in the capacity for the permanent storage. Even though the data taking strategies and operation conditions are different between experiments, there are several common trends such as more extensive online computing and the adoption of hardware accelerators such as FPGA and GPGPUs to efficiently process the data online. |
Monday, November 27, 2023 4:30PM - 5:00PM |
4WCB.00002: Progress towards a streaming DAQ for the ePIC collaboration at the EIC Invited Speaker: Joachim Schambach The Electron Ion Collider (EIC) will be a unique machine colliding electrons with polarized protons and nuclei, constructed at Brookhaven National Laboratory (BNL) by a collaboration between the Thomas Jefferson National Laboratory (JLAB) and BNL. The EIC allows studies of multi-dimensional tomographic images of protons and nuclei, as well as collective effects of gluons in nuclei. It will be completed in the early 2030s. The "ePIC" collaboration was formed to design and construct the first general purpose detector to be ready at the beginning of the operation of the EIC to be sited at the IP6 interaction region of the RHIC/EIC accelerator complex. The physics calls for a 4π general purpose detector, plus far-forward and far-backward detectors highly integrated with the accelerator beam lines. More than 20 detector sub-systems will produce raw data rates in the order of 100 Tbps. The strategy of the ePIC DAQ is to reduce these raw data rates to a more manageable rate "to tape" around 100 Gbps, utilizing streaming readout technologies. The streaming readout concepts to be deployed at ePICs foresee to digitize all collision data without the use of an external trigger, aggressively zero suppress the data in "Front End boards" (FEB, containing the digitizing ASICs) and FPGA based Readout Boards (RDO), resulting in zero or very low deadtime. Data will be further reduced in several stages of the DAQ utilizing artificial intelligence and machine learning in programmable hardware serving as online data filters between the FEB and the data storage. Synchronization between the different detector sub-systems is facilitated by distributing the beam clock as well as accelerator information via a Global Timing Unit (GTU), which interfaces both to the collider, as well as run control and the DAQ hardware. The GTU is also the source for the distribution of a very low jitter (~10ps) clock for use in detector sub-systems requiring a precision clock such as the Time-of-Flight detector. In this talk I will describe the details of the ePIC DAQ proposal, including preliminary work on prototyping various aspects of the planned implementation. |
Monday, November 27, 2023 5:00PM - 5:30PM |
4WCB.00003: A new DAQ collaboration in Japan Invited Speaker: Shinsuke Ota Various data acquisition (DAQ) systems, consisting of frontend electronics, fast transfer protocols and interfaces, triggering system, acquisition and analysis softwares, and computing infrastructure have been individually developed adapting for many types of detector setups aiming at a variety of physics cases in particle and nuclear physics. To maintain such DAQ systems, each facility or experimental group should prepare each human resource and training program, which is becoming difficult. Production of trigger signals is another practical issue due to the complexity of detector setup, and to the high event rate thanks to the high intensity beams provided. |
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