VI. RNC ACTIVITIESRIKEN Accel. Prog. Rep. 54 (2021)

Research Facility Development Division
Research Instruments Group
Computing and Network Team
1. Abstract

This team is in charge of development, management and operation of the computing and network environment, mail and information servers and data acquisition system and management of the information security of the RIKEN Nishina Center.

2. Major Research Subjects
(1)
(2)
(3)
(4)
(5)

Development, management and operation of the general computing servers
Development, management and operation of the mail and information servers
Development, management and operation of the data acquisition system
Development, management and operation of the network environment
Management of the information security

3. Summary of Research Activity

This team is in charge of development, management and operation of the computing and network environment, mail and information servers and data acquisition system and management of the information security. The details are described elsewhere in thisprogress report.
(1) Development, management and operation of the general computing servers
We are operating Linux/Unix NIS/NFS cluster system for the data analysis of the experiments and general computing. This
cluster system consists of eight computing servers with 64 CPU cores and totally 200 TB RAID of highly-reliable Fibre-channelinterconnection. There are approximately 300 active user accounts on this cluster system (a total of about 800 accounts were registeredso far). We are adopting the latest version of the Scientific Linux (X86 64) as the primary operating system, which is widely used in
the accelerator research facilities, nuclear physics and high-energy physics communities in the world.
(2) Development, management and operation of the mail and information servers
We are operating RIBF.RIKEN.JP server as a mail/NFS/NIS server. This server is a core server of RIBF Linux cluster system.
Postfix has been used for mail transport software and dovecot has been used for imap and pop services. These software packages
enable secure and reliable mail delivery. Sophos Email Security and Control (PMX) installed on the mail front-end servers whichtags spam mails and isolates virus-infected mails. The probability to identify the spam is approximately 95–99%. We are operating
several information servers such as Web servers, Integrated Digital Conference (INDICO) server, Wiki servers, Groupware servers,Wowza streaming servers. We have been operating approximately 70 units of wireless LAN access points in RNC. Almost the entire
radiation-controlled area of the East Area of RIKEN Wako campus is covered by wireless LAN for the convenience of experiments
and daily work.
(3) Development, management and operation of the data acquisition system
We have developed the standard data-acquisition system named as RIBFDAQ. This system can process up to 40 MB/s data. By
using crate-parallel readout from front-end systems such as CAMAC and VME, the dead time could be minimized. To synchronize theindependent DAQ systems, the time stamping system has been developed. The resolution and depth of the time stamp are 10 ns and48 bits, respectively. This time stamping system is very useful for beta decay experiments such as EURICA, BRIKEN and VANDLEprojects. One of the important tasks is the DAQ coupling, because detector systems with dedicated DAQ systems are transported toRIBF from foreign facilities. In case of SAMURAI Silicon (NSCL/TUM/WUSTL), the readout system is integrated into RIBFDAQ.
The projects of MUST2 (GANIL), MINOS (CEA Saclay), NeuLAND (GSI) and TRB3 (TUM) cases, data from their DAQ systems
are transferred to RIBFDAQ and merged online. For SPIRIT (RIKEN/GANIL/CEA Saclay/NSCL), RIBFDAQ is controlled fromthe NARVAL-GET system that is a large-scale signal processing system for the time projection chamber. EURICA (GSI), BRIKEN(GSI/Univ. Liverpool/IFIC), VANDLE (UTK) and OTPC (U. Warsaw) projects, we adopt the time stamping system to apply individual
trigger for each detector system. In this case, data are merged in oﬄine. In addition, we are developing intelligent circuits based onFPGA. General Trigger Operator (GTO) is an intelligent triggering NIM module. Functions of “common trigger management,” “gateand delay generator,” “scaler” are successfully implemented. The trigger system in BigRIPS DAQ is managed by 5 GTO modules. Toimprove the data readout speed of VME system, we have successfully developed the MPV system which is a parallel readout extensionof the VME system. Data readout sequence is completely parallelized that helps to improve the DAQ deadtime. Thanks to the MPVsystem, now the DAQ system in RIBF is 10 times faster than in 2007. Toward to the next generation DAQ system, I have started todevelop a real-time data processing unit based on Xilinx RFSoC that includes FPGA and 4 GHz FADC.
(4) Development, management and operation of the network environment
We have been managing the network environment collaborating with Information Systems Division in RIKEN. All the Ethernet
ports of the information wall sockets are capable of the Gigabit Ethernet connection (10/100/1000 BT). In addition, some 10 Gbps
networks port has been introduced to RIBF experimental area. Approximately 100 units of wireless LAN access points have been
installed to cover the almost entire area of Nishina Center.

- 283 -VI. RNC ACTIVITIESRIKEN Accel. Prog. Rep. 54 (2021)(5) Management of the information security
It is essential to take proper information security measures for information assets. We are managing the information security ofNishina Center collaborating with Information Systems Division in RIKEN.

Members
Team Leader
Hidetada BABA
Research/Technical Scientist
Yasushi WATANABE (Senior Research Scientist)
Special Temporary Research Scientist
Takashi ICHIHARA
Visiting Scientist
Shoichiro KAWASE (Kyushu Univ.)
Student Trainee
Shoko TAKESHIGE (Rikkyo Univ.)

List of Publications & Presentations
Presentations[International Conferences/Workshops]
H.Baba (poster) et al., “MPV—Parallel Readout Architecture for the VME data acquisition system,” 22nd IEEE Real Time Conference,Virtual, October 12–23, 2020.

[Domestic Conferences/Workshops]
武重祥子 (oral), 馬場秀忠他, 「RFSoC を用いた高帯域波形処理システムの開発」, 日本物理学会第 73 回年次大会, 千葉県野田市 (東京理科大学), 2018 年 3 月 22–25 日.
馬場秀忠 (oral), 「並列化 VME の紹介」, 計測システム研究会 2020@J-PARC, 茨城県東海村 (KEK 東海キャンパス) & オンライン開催, 2020 年 11 月 26–27 日.

Awards
市原卓, 2020 年 JPCERT/CC 感謝, JPCERT コーディネーションセンター, 2020 年 8 月 19 日.

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