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Numerical investigation of radiation shielding using planetary magnetic fields

JAXA Supercomputer System Annual Report April 2017-March 2018

Report Number: R17EU0804

Subject Category: Space and Astronautical Science

PDF available here

  • Responsible Representative: Eiichi Sato, Department of Space Flight Systems, Institute of Space and Astronautical Science
  • Contact Information: Kazuma Emoto kazuma-emoto-vh@ynu.jp
  • Members: Hitoshi Kuninaka, Yoshinori Takao, Kazuma Emoto

Abstract

For manned space exploration, space radiation causes harsh radiation exposure. To protect crews from radiation exposure, we propose radiation shielding using planetary magnetic fields. We evaluate the magnetic shielding by numerical simulation because the planetary magnetic field expands the large area. We simulate space radiation in the planetary magnetic field and clarify the performance of the magnetic shielding.

Reference URL

N/A

Reasons for using JSS2

We need large-scale parallel computing to simulate trajectories of many energetic particles.

Achievements of the Year

We focus on Martian magnetic anomalies and conducted the simulation of the radiation shielding. We simulated trajectories of energetic particles using a relativistic Buneman-Brois method and evaluated the radiation shielding using the magnetic anomaly. Figure 1 shows a distribution of normalized particle hits reaching the Martian surface. The magnetic anomaly could completely shield energetic particles with a specific incident angle. The complete shielding means that the radiation exposure is zero on the Martian surface. Martian magnetic anomalies could realize the radiation shielding from energetic particles.

Annual Reoprt Figures for 2017

Fig.1: A distribution of normalized particle hits

 

Publications

■ Peer-reviewed papers

1) Kazuma Emoto, Yoshinori Takao, and Hitoshi Kuninaka: A Preliminary Study on Radiation Shielding Using Martian Magnetic Anomalies, Biological Sciences in Space, in press.

■ Presentations

1) Kazuma Emoto, Yoshinori Takao, and Hitoshi Kuninaka: A Preliminary Investigation on Radiation Shielding Using Martian Magnetic Anomalies, Space Transportation Symposium FY2017, STEP-2017-021, Sagamihara, January 2018.

Usage of JSS2

Computational Information

  • Process Parallelization Methods: MPI
  • Thread Parallelization Methods: N/A
  • Number of Processes: 3020
  • Elapsed Time per Case: 4.00 hours

Resources Used

 

Fraction of Usage in Total Resources*1(%): 0.04

 

Details

Please refer to System Configuration of JSS2 for the system configuration and major specifications of JSS2.

Computational Resources
System Name Amount of Core Time
(core x hours)
Fraction of Usage*2(%)
SORA-MA 329,457.50 0.04
SORA-PP 0.00 0.00
SORA-LM 0.00 0.00
SORA-TPP 0.00 0.00

 

File System Resources
File System Name Storage Assigned
(GiB)
Fraction of Usage*2(%)
/home 014.31 0.01
/data 143.05 0.00
/ltmp 2,929.69 0.22

 

Archiver Resources
Archiver Name Storage Used
(TiB)
Fraction of Usage*2(%)
J-SPACE 0.00 0.00

*1: Fraction of Usage in Total Resources: Weighted average of three resource types (Computing, File System, and Archiver).

*2: Fraction of Usage:Percentage of usage relative to each resource used in one year.

JAXA Supercomputer System Annual Report April 2017-March 2018