A beamline for fundamental neutron physics at TRIUMF

Ahmed, S.; Andalib, T.; Barnes, Michael; Bidinosti, C.B.; Bylinsky, Y.; Chak, J.; Das, Mala; Davis, Charles A.; Franke, B.; Giampa, P.; Hahn, Michael E.; Hansen-Romu, S.; Hatanaka, K.; Jamieson, B.; Jones, David P.H.; Katsika, K.; Kawasaki, S.; Klassen, W.; Konaka, A.; Korkmaz, E.; Kuchler, F.; Lang, Μ.; Lee, L.; Lindner, T.; Madison, Kirk W.; Mammei, J.; Mammei, R.; Martin, J. W.; Matsumiya, R.; Picker, R.; Pierre, E.; Ramsay, W. D.; Rao, Yi-Nong; Rawnsley, W.R.; Rebenitsch, L.; Remon, C.A.; Schreyer, W.; Sikora, A.; Sidhu, S.; Sonier, J. E.; Thorsteinson, B.; Vanbergen, S.; Oers, W. T. H. van; Watanabe, Yutaka; Yosifov, D.

doi:10.1016/j.nima.2019.01.074

Cited by 14 publications

(6 citation statements)

References 24 publications

(28 reference statements)

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“…Our motivation for this work is the development of a proposed experiment to measure the electric dipole moment (EDM) of the neutron at the new ultracold neutron facility at TRIUMF [1,2]. The observation of a permanent EDM of a particle or system would provide a direct signal of time-reversal symmetry breaking, which in turn could help our understanding of important questions such as physics beyond the standard model or the cosmological matter-antimatter asymmetry [3].…”

Section: Introductionmentioning

confidence: 99%

Analytic models of magnetically enclosed spherical and solenoidal coils

Liu

Andalib

Ostapchuk

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

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We provide analytic solutions of the net magnetic field generated by spherical and solenoidal coils enclosed in highly-permeable, coaxial magnetic shields.We consider both spherical and cylindrical shields in the case of the spherical coil and only cylindrical shields for the solenoidal coil. Comparisons of field homogeneity are made and we find that the solenoidal coil produces the more homogeneous field for a given number of windings. The models are useful as theoretical and conceptual guides for coil design, as well as for benchmarking finite-element analysis. We also demonstrate how the models can be generalized to explore field inhomogeneities related to winding misplacement.

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Section: Introductionmentioning

confidence: 99%

Analytic models of magnetically enclosed spherical and solenoidal coils

Liu

Andalib

Ostapchuk

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

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“…2. A schematic top view of the proton beamline for the UCN facility at TRIUMF (see also [6]). Beam from the TRIUMF cyclotron enters through beamline 1V from the left side of the figure and proceeds to the right.…”

Section: Beamline Layoutmentioning

confidence: 99%

Fast-switching magnet serving a spallation-driven ultracold neutron source

Ahmed¹,

Altiere²,

Andalib³

et al. 2019

Phys. Rev. Accel. Beams

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A fast-switching, high-repetition-rate magnet and power supply have been developed for and operated at TRIUMF, to deliver a proton beam to the new ultracold neutron (UCN) facility. The facility possesses unique operational requirements: a time-averaged beam current of 40 µA with the ability to switch the beam on or off for several minutes. These requirements are in conflict with the typical operation mode of the TRIUMF cyclotron which delivers nearly continuous beam to multiple users. To enable the creation of the UCN facility, a beam-sharing arrangement with another facility was made. The beam sharing is accomplished by the fast-switching (kicker) magnet which is ramped in 50 µs to a current of 193 A, held there for approximately 1 ms, then ramped down in the same short period of time. This achieves a 12 mrad deflection which is sufficient to switch the proton beam between the two facilities. The kicker magnet relies on a high-current, lowinductance coil connected to a fast-switching power supply that is based on insulated-gate bipolar transistors (IGBTs). The design and performance of the kicker magnet system and initial beam delivery results are reported.

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“…An average current of up to 40 µA can be taken from the maximum current of 120 µA in beamline 1A allowing simultaneous operation with other users at TRIUMF. Details on the beamline can be found in a recently submitted publication [25].…”

Section: Ucn Beamlinementioning

confidence: 99%

Searches for Electric Dipole Moments—Overview of Status and New Experimental Efforts

Collaborations

2019

Universe

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Searches for permanent electric dipole moments (EDMs) of fundamental particles, atoms and molecules are promising experiments to constrain and potentially reveal beyond Standard Model (SM) physics. A non-zero EDM is a direct manifestation of time-reversal (T) violation, and, equivalently, violation of the combined operation of charge-conjugation (C) and parity inversion (P). Identifying new sources of CP violation can help to solve fundamental puzzles of the SM, e.g., the observed baryon-asymmetry in the Universe. Theoretical predictions for magnitudes of EDMs in the SM are many orders of magnitude below current experimental limits. However, many theories beyond the SM require larger EDMs. Experimental results, especially when combined in a global analysis, impose strong constraints on CP violating model parameters. Including an overview of EDM searches, I will focus on the future neutron EDM experiment at TRIUMF (Vancouver). For this effort, the TUCAN (TRIUMF Ultra Cold Advanced Neutron source) collaboration is aiming to build a strong, world leading source of ultra cold neutrons (UCN) based on a unique combination of a spallation target and a superfluid helium UCN converter. Another focus will be the search for an EDM of the diamagnetic atom 129 Xe using a 3 He comagnetometer and SQUID detection. The HeXeEDM collaboration has taken EDM data in 2017 and 2018 in the magnetically shielded room (BMSR-2) at PTB Berlin.

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A beamline for fundamental neutron physics at TRIUMF

Cited by 14 publications

References 24 publications

Analytic models of magnetically enclosed spherical and solenoidal coils

Analytic models of magnetically enclosed spherical and solenoidal coils

Fast-switching magnet serving a spallation-driven ultracold neutron source

Searches for Electric Dipole Moments—Overview of Status and New Experimental Efforts

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