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Title: Ultracold neutron storage simulation using the Kassiopeia software package

Journal Article · · New Journal of Physics
 [1]; ORCiD logo [2]; ORCiD logo [3]
  1. Massachusetts Institute of Technology (MIT), Cambridge, MA (United States); Stanford University, CA (United States); OSTI
  2. Massachusetts Institute of Technology (MIT), Cambridge, MA (United States); University of Chicago, IL (United States)
  3. Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)
+ Show Author Affiliations

The Kassiopeia software package was originally developed to simulate electromagnetic fields and charged particle trajectories for neutrino mass measurement experiments. Recent additions to Kassiopeia also allow it to simulate neutral particle trajectories in magnetic fields based on their magnetic moments. Two different methods were implemented: an exact method that can work for arbitrary fields and an adiabatic method that is limited to slowly-varying fields but is much faster for large precession frequencies. Additional interactions to simulate reflection of ultracold neutrons (UCNs) from material walls and to allow spin–flip pulses were also added. These tools were used to simulate neutron precession in a room temperature neutron electric dipole moment experiment and predict the values of the longitudinal and transverse relaxation times as well as the trapping lifetime. All three parameters are found to closely match the experimentally determined values when simulated with both the exact and adiabatic methods, confirming that Kassiopeia is able to accurately simulate neutral particles. This opens the door for future uses of Kassiopeia to prototype the next generation of atomic traps and UCN experiments.

Research Organization:
Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
SERI-FCS; Sigma Xi; USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
SC0011091
OSTI ID:
1979332
Journal Information:
New Journal of Physics, Journal Name: New Journal of Physics Journal Issue: 2 Vol. 24; ISSN 1367-2630
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
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particle tracking
simulations
software
spin tracking
ultracold neutrons