Abstract
A homemade Bonner cylinder spectrometer was used to determine the neutron spectrum from thermal energy up to several GeV at a heavily-shielded light source facility. The spectrometer, similar to the design of Bonner spheres, features high sensitivity of neutron detection because of using a long cylindrical 3 He proportional counter. The spectrum measurement was performed during the facility commissioning by intentionally parking the injected electrons at the septum of the storage ring. Based on a high-fidelity FLUKA simulation, the predicted neutron spectrum at the location of measurement was adopted as the initial guess of spectrum unfolding. The unfolded result indicated an underestimation of the calculated neutron spectrum in the high-energy portion, leading to a substantial revision of the neutron dose rate at the location.
Highlights
Taiwan Photo Source (TPS), situated at the National Synchrotron Radiation Research Center in Hsinchu, is a 3 GeV light source facility with a circumference of 518 m, aiming to provide synchrotron light with extremely high brilliance and low emittance [1]
The storage ring and concentric booster were installed in a shared tunnel made of 1 m thick concrete walls, and the shielding in the injection area and ratchet end walls were enhanced to 1.2 m thick concrete against injection beam loss and forward-peaked bremsstrahlung, respectively
Neutron counting rates of all Bonner cylinders were evaluated by folding the resultant spectrum with corresponding detector response functions
Summary
Taiwan Photo Source (TPS), situated at the National Synchrotron Radiation Research Center in Hsinchu, is a 3 GeV light source facility with a circumference of 518 m, aiming to provide synchrotron light with extremely high brilliance and low emittance [1]. Electrons are generated and pre-accelerated to 150 MeV through a linear accelerator (LINAC), with a typical beam output of 2.25 W corresponding to 5 nC per pulse and 3 Hz repetition rate. These electrons are further accelerated to 3 GeV in a booster synchrotron and injected into a storage ring. The storage ring and concentric booster were installed in a shared tunnel made of 1 m thick concrete walls, and the shielding in the injection area and ratchet end walls were enhanced to 1.2 m thick concrete against injection beam loss and forward-peaked bremsstrahlung, respectively
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