J-GLOBAL         Last updated: Dec 1, 2019 at 17:55
High Energy Accelerator Research Organization
Computing Research Center
Job title
Associate Professor
Ph.D(Kyoto Univ.)


Koichi Murakami is an associate professor of the Computing Research Center, KEK. Koichi has a background of high energy physics (HEP), and now leads the computer system, KEKCC, that supports physics experiments conducted in KEK. Koichi is the lead system architect and in charge of the system design and operation, especially the data-intensive computing area that covers the topics of workload management, high-performance storage system, and data center management. Koichi has various experiences and exceptional perspectives on high-performance computing to support computing in the HEP application field.
In his research filed, Koichi is involved in the development of the Geant4 detector simulation package from the very beginning of the project. Geant4 is now the defacto-standard tool for detector simulation and is used in a wide variety of scientific fields. Koichi has been a core developer and also a steering board member. Koichi also applies his expertise to parallel processing of Monte Carlo simulation using the GPGPU technology, which allows boosting simulation speed drastically. Koichi is the original developer of MPEXS, a GPU-based radiotherapy simulator, and leads the project team. He focuses on extending MPEXS physics coverage and its functionalities, which improves the computing performance of simulations in different application fields.

Research Areas


Published Papers

Sakata D, Lampe N, Karamitros M, Kyriakou I, Belov O, Bernal MA, Bolst D, Bordage MC, Breton V, Brown JMC, Francis Z, Ivanchenko V, Meylan S, Murakami K, Okada S, Petrovic I, Ristic-Fira A, Santin G, Sarramia D, Sasaki T, Shin WG, Tang N, Tran HN, Villagrasa C, Emfietzoglou D, Nieminen P, Guatelli S, Incerti S
Physica medica : PM : an international journal devoted to the applications of physics to medicine and biology : official journal of the Italian Association of Biomedical Physics (AIFB)   62 152-157   Jun 2019   [Refereed]
Okada S, Murakami K, Incerti S, Amako K, Sasaki T
Medical physics   46(3) 1483-1500   Mar 2019   [Refereed]
Sakata D, Kyriakou I, Okada S, Tran HN, Lampe N, Guatelli S, Bordage MC, Ivanchenko V, Murakami K, Sasaki T, Emfietzoglou D, Incerti S
Medical physics   45(5) 2230-2242   May 2018   [Refereed]
Murakami Koichi, Takase Wataru, Nakamura Tomoaki, Iwai Go, Sasaki Takashi
J. Phys. Conf. Ser.   898 082038   Nov 2017   [Refereed]
© Published under licence by IOP Publishing Ltd. The KEK central computer system (KEKCC) supports various activities in KEK, such as the Belle/Belle II, J-PARC experiments, etc. The system was totally replaced and launched in September 2016. The c...
Nakamura T, Murakami K, Suzuki S, Matsunaga H, Takase W, Sasaki T, Iwai G
J. Phys. Conf. Ser.   898 052042   2017   [Refereed]
Iwai Go, Matsunaga Hiroyuki, Murakami Koichi, Nakamura Tomoaki, Sasaki Takashi, Suzuki Soh Y, Takase Wataru
International Symposium on Grids and Clouds (ISGC) 2016   270 037   2017   [Refereed]
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment      Nov 2016   [Refereed]
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms      Apr 2016   [Refereed]
Okada Shogo, Murakami Koichi, Amako Katsuya, Sasaki Takashi, Incerti Sebastien, Karamitros Mathieu, Henderson Nick, Gerritsen Margot, Asai Makoto, Dotti Andrea
INNOVATION IN MEDICINE AND HEALTHCARE 2015   45 323-332   2016   [Refereed]


岡田勝吾, 村上晃一, 尼子勝哉, 佐々木節, 木村彰徳, 小井辰巳, 浅井眞, DOTTI Andorea, GERRITSEN Margot, INCERTI Sebastien
応用物理学会春季学術講演会講演予稿集(CD-ROM)   65th ROMBUNNO.20a‐A304‐1   Mar 2018
T. Nakamura, G. Iwai, H. Matsunaga, K. Murakami, T. Sasaki, S. Suzuki, W. Takase
Journal of Physics: Conference Series   898    Nov 2017
© Published under licence by IOP Publishing Ltd. A lot of experiments in the field of accelerator based science are actively running at High Energy Accelerator Research Organization (KEK) by using SuperKEKB and J-PARC accelerator in Japan. In thes...
佐々木節, 村上晃一, 尼子勝哉, 岡田勝吾, 藏重久弥, 田中覚, 木村彰徳, 阿蘇司, 吉田肇, 山下智弘, 歳藤利行, 大町千尋, 浅井慎
放射線   43(2) 59‐68   May 2017
Go Iwai, Hiroyuki Matsunaga, Koichi Murakami, Tomoaki Nakamura, Takashi Sasaki, Soh Suzuki, Wataru Takase
Proceedings of Science   2016-March    Jan 2016
© Copyright owned by the author(s) under the terms of the Creative Commons The High Energy Accelerator Research Organization (KEK) plays a key role in particle physics experiments, as well as supporting the related research communities in Japanese...
歳藤利行, 佐々木節, 村上晃一, 尼子勝哉, 丹羽公雄, 久保田寛隆, 吉田純也, 渋谷寛, 小川了, 福島知佳, 兼松伸幸, 小森雅孝, 安田仲宏, 小平聡, 太田周也
NIRS-M (National Inst. of Radiological Sciences)   (226) 254-255   Jun 2009