TY - JOUR

T1 - Trigger slow control system of the Belle II experiment

AU - Kim, C. H.

AU - Unno, Y.

AU - Cho, H. E.

AU - Cheon, B. G.

AU - Kim, S. H.

AU - Lee, I. S.

AU - Jang, E. J.

AU - Choi, S. K.

AU - Kim, Y. J.

AU - Ahn, J. K.

AU - Remnev, M.

AU - Kuzmin, A.

AU - Koga, T.

AU - Lai, Y. T.

AU - Iwasaki, Y.

AU - Nakazawa, H.

AU - Liventsev, D.

AU - Nakao, M.

AU - Yamada, S.

AU - Itoh, R.

AU - Konno, T.

AU - Park, S. H.

AU - Kwon, Y. J.

AU - Hartbrich, O.

AU - Ritzert, M.

N1 - Funding Information: This research was supported by Basic Science Research program, South Korea ( NRF-2018R1A2B3003643 ) and Foreign Large-size Research Facility Application Supporting project ( NRF-2019K1A3A7A09033857 and NRF-2019K1A3A7A09035008 ) through the National Research Foundation of Korea . Publisher Copyright: © 2021

PY - 2021/10/21

Y1 - 2021/10/21

N2 - The Belle II experiment at the SuperKEKB e+e− collider in KEK, Japan, started physics data-taking with a complete detector from early 2019. An online trigger system is indispensable for the Belle II experiment to reduce the beam background events associated with high electron and positron beam currents without sacrificing the target physics-oriented events. During the Belle II operation upon beam collision, the trigger system must be consistently controlled and its status must be carefully monitored in the process of data acquisition against unexpected situations. For this purpose, we have developed a slow control system for the newly developed Belle II trigger system based on the custom-made Belle II DAQ/slow control package. Around seventy thousand configuration parameters are saved in the Belle II central database server for every run when a run starts and stops. These parameters play an essential role in offline validation of the quality of runs. Around three thousand real-time variables are stored in the Belle II main archiving server, and the trend of some of these variables are regularly used for online and offline monitoring purposes. Various operator interface tools have been prepared and used. When the configuration parameters are not correctly applied, or some of the processes are unexpectedly terminated, the slow control system detects it, stops the data-taking process, and generates an alarm. In this article, we report how we constructed the Belle II trigger slow control system, and how we successfully managed to operate during its initial stage.

AB - The Belle II experiment at the SuperKEKB e+e− collider in KEK, Japan, started physics data-taking with a complete detector from early 2019. An online trigger system is indispensable for the Belle II experiment to reduce the beam background events associated with high electron and positron beam currents without sacrificing the target physics-oriented events. During the Belle II operation upon beam collision, the trigger system must be consistently controlled and its status must be carefully monitored in the process of data acquisition against unexpected situations. For this purpose, we have developed a slow control system for the newly developed Belle II trigger system based on the custom-made Belle II DAQ/slow control package. Around seventy thousand configuration parameters are saved in the Belle II central database server for every run when a run starts and stops. These parameters play an essential role in offline validation of the quality of runs. Around three thousand real-time variables are stored in the Belle II main archiving server, and the trend of some of these variables are regularly used for online and offline monitoring purposes. Various operator interface tools have been prepared and used. When the configuration parameters are not correctly applied, or some of the processes are unexpectedly terminated, the slow control system detects it, stops the data-taking process, and generates an alarm. In this article, we report how we constructed the Belle II trigger slow control system, and how we successfully managed to operate during its initial stage.

KW - Data acquisition

KW - Slow control system

KW - Trigger

UR - http://www.scopus.com/inward/record.url?scp=85113561510&partnerID=8YFLogxK

U2 - 10.1016/j.nima.2021.165748

DO - 10.1016/j.nima.2021.165748

M3 - Article

AN - SCOPUS:85113561510

VL - 1014

JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

SN - 0168-9002

M1 - 165748

ER -