Redifining RADEN's high-resolution neutron imaging capabilities.

Area of Science:

• Nuclear Physics
• Materials Science
• Imaging Technology

Background:

• The Japan Proton Accelerator Research Complex (J-PARC) houses the Energy-Resolved Neutron Imaging System (RADEN).
• Accurate characterization of beam collimation is crucial for neutron imaging applications.
• Previous estimations of RADEN's collimation power (L/D factor) required reevaluation.

Purpose of the Study:

• To systematically reevaluate and accurately determine the collimation power of the RADEN beamline.
• To compare the performance of different scintillator materials and thicknesses for neutron imaging.
• To investigate discrepancies between geometrically calculated and experimentally measured L/D factors.

Main Methods:

• Employed a state-of-the-art method for calculating the L/D factor.
• Utilized a standard reference sample for measuring neutron image resolution.
• Compared five different scintillators: 6LiF:ZnS(Ag) (50, 100, 200, 300 μm) and Gd2O2S (50 μm).

Main Results:

• The collimating power of the RADEN beam was determined to be significantly higher than previously assumed, ranging from 470 to 1520.
• Demonstrated superior performance of the RADEN beamline.
• Identified a discrepancy between geometrically calculated and experimentally measured L/D values.

Conclusions:

• The actual measurable collimation power of the RADEN beamline is substantially greater than prior estimates.
• The study underscores the importance of experimental validation for beamline characterization.
• Highlights the advanced capabilities of the RADEN facility for neutron imaging research.