PENTrack—a simulation tool for ultracold neutrons, protons, and electrons in complex electromagnetic fields and geometries

Schreyer, W.; Kikawa, T.; Losekamm, Martin J.; Paul, S.; Picker, R.

doi:10.1016/j.nima.2017.03.036

Cited by 8 publications

(10 citation statements)

References 23 publications

(32 reference statements)

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“…To simulate UCN storage and transport, we built a detailed model of the production volume and UCN guides for the Monte Carlo simulation PENTrack [25], including the burst disk, actual shape of the UCN valve in open and closed state, pinhole, foil, and main detector. PENTrack uses Fermi potentials to model interaction of UCNs with materials; the imaginary part of the potential determines the loss of UCNs.…”

Section: Comparison With Simulationsmentioning

confidence: 99%

First ultracold neutrons produced at TRIUMF

Ahmed¹,

Altiere²,

Andalib³

et al. 2019

Phys. Rev. C

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We installed a source for ultracold neutrons at a new, dedicated spallation target at TRIUMF. The source was originally developed in Japan and uses a superfluid-helium converter cooled to 0.9 K. During an extensive test campaign in November 2017, we extracted up to 325 000 ultracold neutrons after a one-minute irradiation of the target, over three times more than previously achieved with this source. The corresponding ultracold-neutron density in the whole production and guide volume is 5.3 cm −3 . The storage lifetime of ultracold neutrons in the source was initially 37 s and dropped to 24 s during the eighteen days of operation. During continuous irradiation of the spallation target, we were able to detect a sustained ultracold-neutron rate of up to 1500 s −1 .Simulations of UCN production, UCN transport, temperature-dependent UCN yield, and temperature-dependent storage lifetime show excellent agreement with the experimental data and confirm that the ultracold-neutron-upscattering rate in superfluid helium is proportional to T 7 .

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Section: Comparison With Simulationsmentioning

confidence: 99%

First ultracold neutrons produced at TRIUMF

Ahmed¹,

Altiere²,

Andalib³

et al. 2019

Phys. Rev. C

Self Cite

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“…Several alternative simulation codes are available as STARucn [21], PENTrack [22], and GEANT4UCN [23]. This allows for comparison of independent calculations, very important for increasing confidence in using these codes and in intricate numerical estimations.…”

Section: Introductionmentioning

confidence: 99%

The MCUCN simulation code for ultracold neutron physics

Zsigmond

2018

Nuclear Instruments and Methods in Physics Research Section A:

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Ultracold neutrons (UCN) have very low kinetic energies 0-300 neV, thereby can be stored in specific material or magnetic confinements for many hundreds of seconds. This makes them a very useful tool in probing fundamental symmetries of nature (for instance charge-parity violation by neutron electric dipole moment experiments) and contributing important parameters for the Big Bang nucleosynthesis (neutron lifetime measurements). Improved precision experiments are in construction at new and planned UCN sources around the world. MC simulations play an important role in the optimization of such systems with a large number of parameters, but also in the estimation of systematic effects, in benchmarking of analysis codes, or as part of the analysis. The MCUCN code written at PSI has been extensively used for the optimization of the UCN source optics and in the optimization and analysis of (test) experiments within the nEDM project based at PSI. In this paper we present the main features of MCUCN and interesting benchmark and application examples.

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“…Absorption and upscattering on and in materials can be expressed via an imaginary Fermi potential U F = V F − iW F . The larger the real part V F of wall materials, the larger the energy spread of UCN may be; the larger the imaginary part W F the higher the loss probability per wall bounce, see [20]. The geometry of UCN storage vessels and guides influences the mean free path between wall hits and therefore the losses of UCN due to W F .…”

Section: Performance Estimationmentioning

confidence: 99%

Estimated performance of the TRIUMF ultracold neutron source and electric dipole moment apparatus

Sidhu

Schreyer²,

Vanbergen³

et al. 2023

EPJ Web Conf.

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Searches for the permanent electric dipole moment of the neutron (nEDM) provide strong constraints on theories beyond the Standard Model of particle physics. The TUCAN collaboration is constructing a source for ultra-cold neutrons (UCN) and an apparatus to search for the nEDM at TRIUMF, Vancouver, Canada. In this work, we estimate that the spallation-driven UCN source based on a superfluid helium converter will provide (1.38 ± 0.02) 107 polarized UCN at a density of 217 ± 3 UCN/cm3 to a room-temperature EDM experiment per fill. With (1.43 ± 0.02) 106 neutrons detected after the Ramsey cycle, the statistical sensitivity for an nEDM search per storage cycle will be (1.94 ± 0.06) × 10−25 ecm (1σ). The goal sensitivity of 10−27 ecm (1σ) can be reached within 281 ± 16 measurement days.

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PENTrack—a simulation tool for ultracold neutrons, protons, and electrons in complex electromagnetic fields and geometries

Cited by 8 publications

References 23 publications

First ultracold neutrons produced at TRIUMF

First ultracold neutrons produced at TRIUMF

The MCUCN simulation code for ultracold neutron physics

Estimated performance of the TRIUMF ultracold neutron source and electric dipole moment apparatus

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