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Homogeneous fields: Double expansion method, 3D printing/CNC realization, and verification by atomic magnetometry.

Daniel A Rodriguez Castillo1, Jaafar N Ansari1, Robert J Cooper1

  • 1Department of Physics and Astronomy, Quantum Science and Engineering Center, George Mason University, Fairfax, VA 22030, United States.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|May 18, 2020
PubMed
Summary
This summary is machine-generated.

This study presents a novel method for designing homogeneous magnetic fields for quantum magnetometers. The technique ensures high field accuracy, crucial for advanced magnetic resonance applications.

Keywords:
3D printingAtomic magnetometersField designHomogeneousLow-fieldNQR

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Area of Science:

  • Physics
  • Engineering

Background:

  • Homogeneous magnetic fields are critical for low-field magnetic resonance, especially with quantum magnetometers.
  • Designing coils for unusual geometries presents significant challenges in achieving field uniformity.

Purpose of the Study:

  • To propose a double expansion methodology for designing magnetic field coils with high homogeneity.
  • To create current coefficients that cancel higher-order magnetic field terms for improved precision.

Main Methods:

  • Surface current and magnetic field expansion to determine current coefficients.
  • Design of two specific coils: a tuning field for an atomic magnetometer array and a null field for magnetometer operation near a solenoid.
  • Utilizing CNC milling and 3D printing for coil fabrication and verification.

Main Results:

  • Successful design and verification of a tuning field coil for a half-meter atomic magnetometer array, demonstrating CNC milling accuracy.
  • Identification of limitations in 3D printing for precise scientific applications based on null field coil analysis.
  • Both designed coils achieve fifth-order error systems or better, indicating high field homogeneity.

Conclusions:

  • The proposed double expansion method is effective for designing highly homogeneous magnetic fields in complex geometries.
  • CNC milling is a suitable fabrication technique for achieving the required precision for these magnetic field coils.
  • Further research may be needed to overcome the precision limitations of 3D printing for such applications.