Development of the Fast Front-end Trigger System for COMET Phase-I

Fujii, Y.; Nakazawa, Yu; Gillies, Ewen; Hamada, Eitaro; Ikeno, M.; Lee, Myeong Jae; Mihara, S.; Miyazaki, Y.; Shoji, M.; Tai, Chau Thanh; Uchida, Tomohisa; Ueno, Katsunori

doi:10.1109/nssmic.2018.8824619

Cited by 4 publications

(1 citation statement)

References 5 publications

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“…The total processing time of the trigger system has to be less than 5 µs due to buffer sizes of RECBE. A fast online trigger system that meets these requirements is being developed in COMET Phase-I [4,5]. This paper shows the expected system performance during the physics measurement and the test results with a CDC setup for cosmic-ray measurements.…”

Section: Introductionmentioning

confidence: 99%

Fast Online Trigger using FPGA-based Event Classification for the COMET Phase-I

Nakazawa¹,

Fujii²,

Chau³

et al. 2020

Proceedings of European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2019)

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The COMET Phase-I experiment searches for a neutrinoless muon-to-electron conversion which has never been observed yet. The world's highest intensity muon beam is applied, and it leads to an unacceptable trigger rate of O(10 6) Hz. For stable data collection, the trigger rate must be reduced to O(10 3) Hz. This requirement is met using online event classification in the detector system which holds 99% of signal events. This classification is performed by an FPGA-based trigger system, and its processing time is set to less than 5 µs by a buffer size of the detector readout electronics. A prototype board for the trigger system was developed, and communication systems for related electronics devices were also constructed. From test results, the total processing time is estimated to be 2.8 µs , which meets the requirement. We have also developed an online self-trigger system for cosmic-rays and confirmed the feasibility of this hardware logic. The trigger electronics were installed in a setup for cosmic-ray measurement, and the data acquisition was successfully done using the self-trigger system.

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Section: Introductionmentioning

confidence: 99%

Fast Online Trigger using FPGA-based Event Classification for the COMET Phase-I

Nakazawa¹,

Fujii²,

Chau³

et al. 2020

Proceedings of European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2019)

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An FPGA-Based Trigger System With Online Track Recognition in COMET Phase-I

Nakazawa

Fujii

Ikeno

et al. 2021

IEEE Trans. Nucl. Sci.

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Radiation Tolerance of Online Trigger System for COMET Phase-I

Dekkers

Nakazawa²,

Fujii³

et al. 2021

IEEE Trans. Nucl. Sci.

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The COMET experiment aims to search for the neutrinoless muon to electron transition process with new sensitivity levels. The online trigger system is an integral part of achieving the sensitivity levels required and will be subject to an expected neutron fluence of up to 10 12 neq • cm −2 within regions inside the detector solenoid. Consequently a significant number of soft errors in the logic of the on board field programmable gate arrays (FPGA) can occur, requiring error correction for single event upsets and firmware reprogramming schemes for unrecoverable soft errors. We studied the radiation tolerance of the COMET Phase-I front-end trigger system, called COTTRI, subject to neutron fluence on order 10 12 neq •cm −2 with multiple error correcting codes and automatic firmware reconfiguration. The regions measured were the configuration RAM, block RAM and also in a multi-gigabit transfer link using copper cables that will be used for communication between different trigger boards during Phase-I. The resulting error rates suggest the most significant impact to the experiment will come from unrecoverable soft errors in configuration RAM, with dead time expected to be (3.7 ± 1.2) %. The effect of multi-bit errors in block RAM was found to be almost negligible in COMET Phase-I. In addition, multiple solutions have already been proposed in order to suppress these errors further. Error rates observed in the multi-gigabit transfer links were measured to be of two orders of magnitude less impact compared to the unrecoverable errors in configuration RAM. We concluded that the COTTRI system meets the trigger requirement in COMET Phase-I.

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Development of the Fast Front-end Trigger System for COMET Phase-I

Cited by 4 publications

References 5 publications

Fast Online Trigger using FPGA-based Event Classification for the COMET Phase-I

Fast Online Trigger using FPGA-based Event Classification for the COMET Phase-I

An FPGA-Based Trigger System With Online Track Recognition in COMET Phase-I

Radiation Tolerance of Online Trigger System for COMET Phase-I

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