Precision magnetic field mapping for the 3He neutron spin filter

Takashi Ino, Yasushi Arimoto, Hiroshi Kira, Yoshifumi Sakaguchi, Takenao Shinohara, Kenji Sakai, Takayuki Oku, Kazuhisa Kakurai, Kenji Ohoyama

Research output: Contribution to journalConference articlepeer-review


3He neutron spin filters require a homogeneous magnetic field, otherwise the nuclear polarization of the 3He gas will easily be lost by small magnetic field gradients. Magnetic cavities with field gradients of 10-4/cm or better are often in demand, and many such cavities - Helmholtz coils, solenoids, permanent magnet circuits, etc - have been developed [1]. These magnetic cavities are designed mostly by using simulations, but the actual magnetic fields may differ from the calculations because of the presence of the environmental magnetic field as well as nearby magnetic materials. To evaluate the real magnetic fields, a precision magnetometry system with a precision of 10-5 was developed.

Original languageEnglish
Pages (from-to)183-190
Number of pages8
JournalPhysics Procedia
Publication statusPublished - 2013
Event9th International Workshop on Polarised Neutrons in Condensed Matter Investigations, PNCMI 2012 - Paris, France
Duration: 2012 Jul 22012 Jul 5


  • Magnetic field
  • Magnetometer
  • Polarized neutron
  • Spin exchange optical pumping

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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