Study of Deadtime Minimization of a Ultra High Rate Trigger System

2014 Fiscal Year Final Research Report

• Project/Area Number: 22340068
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: High Energy Accelerator Research Organization
• Principal Investigator: MIKIHIKO Nakao 大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 准教授 (80290857)
• Project Period (FY): 2010-04-01 – 2015-03-31
• Keywords: トリガシステム / データ収集システム / シリアル通信プロトコル / FPGA / Bファクトリー / Belle II

Outline of Final Research Achievements

We have developed a system to distribute the triggers for the events of interest at an ultra high rate of 30 kHz to about 1,000 readout devices with minimum latency, and to minimize the deadtime to a negligible level while keeping the pipelined data not exceeding the bandwidth limit. In this study we have designed a new serial transmission protocol to efficiently construct the trigger distribution scheme, and developed an "FTSW" circuit module to implement the protocol as a logic circuit inside an FPGA. This FTSW has been used to evaluate and confirm the design in a test using an artificial trigger of a pseudo Poisson random distribution or in a series of detector readout tests with accelerator beam or cosmic rays, and will be one of the major component of the soon starting Belle II experiment.

Free Research Field

素粒子実験物理学