Speaker
Description
A spallation-driven ultracold neutron (UCN) source developed by the TRIUMF Ultra Cold Advanced Neutron (TUCAN) collaboration has recently been commissioned. Reliable simulations and optimization of the setup require a good understanding of the velocity spectrum of UCNs produced in the source. To address this, a vertical time-of-flight (ToF) spectrometer has been developed and applied to obtain the UCN velocity spectrum.
The spectrometer utilizes a beam chopper to define the start of each counting frame and polyethylene collimators to constrain the vertical velocity components of the UCN, enabling precise ToF measurements. The measured ToF spectrum is used to reconstruct the UCN velocity spectrum and evaluate the spectrometer's performance.
In this contribution, the development of the vertical ToF spectrometer will be presented, together with reconstructed UCN velocity spectra obtained under different experimental conditions. Measurements performed with and without a Cu foil and for different flight path lengths will be compared to identify the consistency and reliability of the reconstructed results.