29 July 2018 to 4 August 2018
Russian Academy of Sciences
Europe/Moscow timezone

Operational status of the Belle II Time-Of-Propagation counter readout and data acquisition system

31 Jul 2018, 10:55
Blue Hall (Russian Academy of Sciences)

Blue Hall

Russian Academy of Sciences

Leninsky Prospekt, 32а Moscow 119071 Russian Federation
Board: 21
poster presentation Technological aspects and applications of Cherenkov detectors Poster Session


Yosuke Maeda (KMI, Nagoya University)


The Time-Of-Propagation counter is a new particle identification (PID) device which was introduced by the Belle II experiment, an upgrade of the Belle experiment. The counter is based on a novel idea of extracting Cherenkov ring information using precise timing information. This feature enables significant improvement of PID performance and a compact detector system, allowing more space for tracking. To realize this concept, it is necessary to detect each single Cherenkov photon with timing resolution of better than 100 ps. Therefore, high-speed electronics is a key point for this detector.
We developed dedicated front-end electronics, which can perform fast waveform sampling and online data processing. Thanks to these features, an excellent timing resolution of 50 ps for single photon detection is achieved and data taking with an input trigger rate of up to 30 kHz is possible. The entire TOP readout system consists of 64 subdetector readout modules (SRM), where each SRM contains 128 readout channels with 8,192 channels in total. All the SRMs are installed in the detector and operational. Firmware development for online data processing for the real detector was started from a simple and robust algorithm, but with limited readout performance. This firmware has been evolving to complicated and high-performance version. We are now finalizing and verifying this readout scheme for the coming first collisions in the Belle II experiment.
In this presentation, the current performance of the readout system for the installed TOP counter is reported and an overview of the hardware is given.

Primary author

Yosuke Maeda (KMI, Nagoya University)


Toru Iijima (Nagoya University) Gary Varner (University of Hawaii) Kenji Inami (Nagoya Univeristy) Kazuhito Suzuki (Nagoya Univerisyt) Kodai Matsuoka (Nagoya Univerisyt) Alessandro Gaz (Nagoya Univeristy) Oskar Hartbrich (University of Hawaii) Martin Bessner (University of Hawaii) Hulya Atmacan (University of Cincinnati) Noritsugu Tsuzuki (Nagoya University) Genta Muroyama (Nagoya Univeristy) Dmitry Neverov (Nagoya University) Satoshi Senga (Nagoya University) Rikuya Okuto (Nagoya University) Hikari Hirata (Nagoya University)

Presentation Materials

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