Last Update : 2023/04/19

What is new?
2023/04/26: Announcement of PHITS in-person tutorials in Cameroon (detail)
2023/04/19: Release of PHITS3.31 (detail)
2023/02/20: Announcement of Online tutorials in 2023 (detail)
2023/02/06: Announcement of PHITS in-person tutorials in Asian countries (detail)
2022/10/02: Announcement of PHITS in-person tutorial at OECD-NEA Paris (detail)
2022/09/14: PHITS tutorial video now available on YouTube! (detail)
2022/04/07: Announcement of PHITS online tutorials (detail)
2022/03/31: Release of PHITS3.27 (detail)
2022/03/30: Upload PHITS logo & mascot (Phi-chan) (see below)
2021/09/06: Announcement of PHITS online tutorial (detail)
2021/06/15: PHITS forum for sharing questions (detail)
2021/04/30: Announcement of PHITS online tutorial (detail)
2021/04/05: New promotional video for PHITS (detail)
2021/03/30: Release of update patch from PHITS3.10 (or later) to PHITS3.24 (detail)
2021/03/08: Upload PHITS-user distribution maps since FY2019 (at the bottom of this page)
2020/10/21: Announcement of PHITS online tutorial (detail)
2020/05/25: Upload Instruction for how to couple with thermal-fluid dynamics (detail)
2020/04/09: Release of update patch from PHITS3.10 (or later) to PHITS3.20 (detail)
2020/01/07: Announcement of PHITS course in Argentina (detail)
2019/10/31: Release of update patch from PHITS3.10 to PHITS3.17 (detail)
2019/10/17: Release of update patch from PHITS3.10 to PHITS3.16 (detail)
2019/09/25: Instructions for how to convert dump files between PHITS and other Monte-Carlo codes (detail)
2019/09/06: Announcement of PHITS course in Myanmar (detail)
2019/04/09: Release of PHITS 3.10 and introduction of new export control policy (detail)
2019/03/01: Addition of information about operation environment in "How to Use" (detail)
2018/01/16: Sample user-defined tally for [t-deposit] with outout=deposit is uploaded (detail)
2018/01/09: Publication on the latest PHITS (Ver.3.02) (detail)
2017/08/24: Lecture notes were updated (detail)
2017/02/02: Registration of PHITS 2.88 in OECD/NEA Databank
2016/12/22: Upload instruction how to use ParaView coupled with PHITS (detail)
2016/09/30: Release of update patch to PHITS2.88 (detail)
Log of PHITS information before Aug. 2016. here

What is PHITS?
PHITS (Particle and Heavy Ion Transport code System) is a general purpose Monte Carlo particle transport simulation code developed under collaboration between JAEA, RIST, KEK and several other institutes. It can deal with the transport of all particles over wide energy ranges, using several nuclear reaction models and nuclear data libraries. PHITS can support your researches in the fields of accelerator technology, radiotherapy, space radiation, and in many other fields which are related to particle and heavy ion transport phenomena. (detail, pdf 9.5MB)

How to refer to PHITS?
Please explicitly write the version of PHITS you used, and refer the following document in context of using any version of PHITS.
Tatsuhiko Sato, Yosuke Iwamoto, Shintaro Hashimoto, Tatsuhiko Ogawa, Takuya Furuta, Shin-ichiro Abe, Takeshi Kai, Pi-En Tsai, Hunter N. Ratliff, Norihiro Matsuda, Hiroshi Iwase, Nobuhiro Shigyo, Lembit Sihver and Koji Niita
Features of Particle and Heavy Ion Transport code System (PHITS) version 3.02, J. Nucl. Sci. Technol. 55, 684-690 (2018).
This is an open access article, and you can download it from here.

Please also refer the following about benchmark calculations, when you discuss about the accuracy of PHITS.
Yosuke Iwamoto, Shintaro Hashimoto, Tatsuhiko Sato, Norihiro Matsuda, Satoshi Kunieda, Yurdunaz Çelik, Naoya Furutachi and Koji Niita
Benchmark study of particle and heavy-ion transport code system using shielding integral benchmark archive and database for accelerator-shielding experiments, J. Nucl. Sci. Technol. 59, 665-675 (2022).
Open access

Manual and Update
You can download the latest version of PHITS manual in pdf here.
Update log of PHITS manual is here.
Update log of PHITS is here.

Request PHITS tutorial
You can request to organize PHITS tutorial courses outside Japan subject to following conditions
1, All participants must submit the license agreement form of PHITS prior to the tutorial
2, All participants should not belong to institutes related to weapon research
3, Organizer (or participants) cover the traveling expense and accomodation cost of the lecturer (normally one person)
To request for PHITS tutorial, please contact PHITS office.
We are waiting for your request!

Logo & Mascot
You can freely use the logo of PHITS in any materials (reports, presentations, products) to which PHITS contributed, but modification is not allowed. This logo is inspired from the animation of the maze-structure shielding simulation shown in the PHITS introduction slide.

Download: Type A (png, jpg), Type B (png, jpg), Type C (png, jpg), Type D (png, jpg)

You can also use the mascot of PHITS named Phi-chan. He is a owl having the character of Φ (phi) in his face. Owl is a symbol of wisdom in Japan.

Download: smile (png, jpg), crying (png, jpg), thinking (png, jpg), sleeping (png, jpg), happy1 (png, jpg), happy2 (png, jpg)

Development members
Tatsuhiko Sato, Yosuke Iwamoto, Shintaro Hashimoto, Tatsuhiko Ogawa, Takuya Furuta, Shinichiro Abe, Takeshi Kai, Norihiro Matsuda, Yuho Hirata, Takuya Sekikawa, Lan Yao, Pi-En Tsai*, Hunter N. Ratliff**: JAEA,Japan
Yusuke Matsuya: Hokkaido University, Japan
Hiroshi Iwase, Yasuhito Sakaki: KEK, Japan
Nobuhiro Shigyo : Kyushu University, Japan
Lembit Sihver : Technische Universitat Wien, Austria
Koji Niita : RIST, Japan
*Current affiliation: Zap Energy, USA
**Current affiliation: Western Norway University of Applied Sciences, Norway

The following members also contributed to the development of PHITS

Hiroshi Nakashima, Tokio Fukahori, Keisuke Okumura, Tetsuya Kai, Shusaku Noda, Yukio Sakamoto, Hiroshi Takada, Shin-ichiro Meigo, Makoto Teshigawara, Fujio Maekawa, Masahide Harada, Yujiro Ikeda : JAEA, Japan
Satoshi Chiba : TITech, Japan
Takashi Nakamura : Tohoku Univ., Japan
Davide Mancusi : Chalmers Univ. of Tech., Sweden

PHITS-user distribution map since FY2019 (last update: 2023/04/22)
/ All users