Summary:
This project is a continued collaborative work for joint research and development between Japan’s KEK and France’s IN2P3 computing centers. It aims at conducting exploratory work on emerging computing technologies of potential interest for building and operating data processing infrastructures for future physics research experiments. This year we focus in particular on two aspects. First, we will work towards the deployment of tools for continuous and on-demand monitoring of the international network circuit linking both computing centers, in particular for bulk data transfer needs. Second, we will start an exploratory work to understand how to exploit and operate a multi-host GPU-based platform for the simulation of physical processes in the framework of the Geant4-DNA project. It is expected that the experience gained by experts of both institutions working together will allow their sites to serve current and future physics experiments of KEK’s and IN2P3’s independent research programs.

French members:
R. Vernet, G. Rahal, F. Hernandez, F. Suter, B. Rigaud, V. Hamar

Japanese members :
T. Nakamura, W. Takase, S. Kaneko, T. Sasaki, S. Suzuki, G. Iwai, K. Murakami

References

website

Summary:

The Belle II experiment, the next generation of the B-Factory, is expected to reveal new physics by accumulating, by 2029, about 2 orders of magnitude larger data sample than the Belle experiment, a similar quantity of data than LHC experiments acquired at similar rates. This requires considerable computing, storage and network resources to handle not only data created by the experiment but also considerable amounts of simulated data. The Belle II computing system has to handle an amount of beam data eventually corresponding to several tens of PetaByte per year under an operation of the SuperKEKB accelerator with a designed instantaneous luminosity. Under this situation, it cannot be expected that a single site, KEK, will be able to provide all computing resources for the whole Belle II collaboration including the resources not only for the raw data processing but also for the MC production and physics analysis done by users. In order to solve this problem, Belle II employed the distributed computing system based on DIRAC, which provides the interoperability of heterogeneous computing systems such as grids with different middleware, clouds and the local computing clusters. Since the last few years, MC mass production campaigns have been performed to confirm the feasibility and find out the possible bottleneck of our computing system. In parallel, the data transfer challenge through the transpacific and transatlantic networks has started. In terms of the computing, the first priority at KEK is the raw data acquisition and processing. Therefore, other data centers (at BNL, Germany, Italy, Canada and France) with reprocessing capabilities will be crucial component of the Belle II computing system. In addition, at the early stage of the experiment, that is until the detector performances are well understood, the software and the detector constants will be often updated and consequently the raw data will have to be re-processed frequently. A raw data center in France will store, from 2021, 15% of the total Belle II data sample and should be able to reprocess several times those data. The project aim is to study solutions for the Belle II computing in France, and to find a system capable of handling raw data and produce the simulated data requested (including cloud resources). The collaboration proposed in this application, with an experienced KEK team fully involved in the Belle II computing since last few years, will allow us to prepare efficiently for a raw data center in France (with regular meetings in France and at KEK). ­

French members:
K. Trabelsi, S. Watanuki, M. Jouvin, G. Philippon, A. Vedaee, Y. Patois

Japanese members :
I. Ueda, H. Miyake, T. Hara, Y. Kato

References

website