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Initial Performance of the TUCAN Magnetically Shielded Room

Fuente: arXiv

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Main Authors:	Ahmed, S., Algohi, B., Anthony, D., Berard, P., Barron-Palos, L., Bosse, M., Brossard, A., Chak, J., Curtis, R., Davis, C., de Vries, R., Dong, K., Dowie, B., Drury, K., Fierlinger, P., Franke, B., Fujimoto, D., Fujitani, R., Giampa, P., Gibson, C., Golub, R., Hatanaka, K., Hepworth, T., Higuchi, T., Hussain, J., Jaison, A., Katotoka, M., Kawasaki, S., Klassen, W., Klemets, E., Korkmaz, E., Korobkina, E., Kuchler, F., Lavvaf, M., Lindner, T., Lo, N., Malcolm, J., Mammei, R., Marshall, C., Martin, J., Matsumiya, R., McCrea, M., Miller, E., Miller, M., Mishima, K., Mohammadi, T., Murby, N., Pankratz, S., Picker, R., Qiao, K., Reimer, T., Sankaran, A., Schreyer, W., Sidhu, S., Smith, L., Stargardter, S., Stutters, R., Switzer, P., Tushar, van der Veek, B., Vanbergen, S., van Oers, W. T. H., Woolger, D., Yazdandoost, N., Ye, Q., Zahra, A., Zhao, M.
Format:	Preprint
Published:	2026
Subjects:	Instrumentation and Detectors
Online Access:	Acceder al recurso
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_version_	1866915941775835136
author	Ahmed, S. Algohi, B. Anthony, D. Berard, P. Barron-Palos, L. Bosse, M. Brossard, A. Chak, J. Curtis, R. Davis, C. de Vries, R. Dong, K. Dowie, B. Drury, K. Fierlinger, P. Franke, B. Fujimoto, D. Fujitani, R. Giampa, P. Gibson, C. Golub, R. Hatanaka, K. Hepworth, T. Higuchi, T. Hussain, J. Jaison, A. Katotoka, M. Kawasaki, S. Klassen, W. Klemets, E. Korkmaz, E. Korobkina, E. Kuchler, F. Lavvaf, M. Lindner, T. Lo, N. Malcolm, J. Mammei, R. Marshall, C. Martin, J. Matsumiya, R. McCrea, M. Miller, E. Miller, M. Mishima, K. Mohammadi, T. Murby, N. Pankratz, S. Picker, R. Qiao, K. Reimer, T. Sankaran, A. Schreyer, W. Sidhu, S. Smith, L. Stargardter, S. Stutters, R. Switzer, P. Tushar van der Veek, B. Vanbergen, S. van Oers, W. T. H. Woolger, D. Yazdandoost, N. Ye, Q. Zahra, A. Zhao, M.
author_facet	Ahmed, S. Algohi, B. Anthony, D. Berard, P. Barron-Palos, L. Bosse, M. Brossard, A. Chak, J. Curtis, R. Davis, C. de Vries, R. Dong, K. Dowie, B. Drury, K. Fierlinger, P. Franke, B. Fujimoto, D. Fujitani, R. Giampa, P. Gibson, C. Golub, R. Hatanaka, K. Hepworth, T. Higuchi, T. Hussain, J. Jaison, A. Katotoka, M. Kawasaki, S. Klassen, W. Klemets, E. Korkmaz, E. Korobkina, E. Kuchler, F. Lavvaf, M. Lindner, T. Lo, N. Malcolm, J. Mammei, R. Marshall, C. Martin, J. Matsumiya, R. McCrea, M. Miller, E. Miller, M. Mishima, K. Mohammadi, T. Murby, N. Pankratz, S. Picker, R. Qiao, K. Reimer, T. Sankaran, A. Schreyer, W. Sidhu, S. Smith, L. Stargardter, S. Stutters, R. Switzer, P. Tushar van der Veek, B. Vanbergen, S. van Oers, W. T. H. Woolger, D. Yazdandoost, N. Ye, Q. Zahra, A. Zhao, M.
contents	The TRIUMF Ultracold Advanced Neutron (TUCAN) collaboration has commissioned a large magnetically shielded room to be used for measuring the neutron electric dipole moment (nEDM) to a precision of $10^{-27}~e\mathrm{cm}$. The room is composed of five layers of MuMetal and one layer of copper and sits within the $\lesssim 370~μ\mathrm{T}$ ambient field produced by the TRIUMF cyclotron. Within this environment, the quasi-static shielding factor was measured to be $3.25(2) \times 10^4$ at $0.01~\mathrm{Hz}$ with an external peak-to-peak perturbation of $2~μ\mathrm{T}$. Without the large ambient cyclotron field, the shielding factor improves to $3.75(4)\times 10^4$ at the same perturbation amplitude and frequency. After idealization in the cyclotron field, the residual field at the room center was $B = 1.8(2)~\mathrm{nT}$ and the vertical first-order gradient across the central 1~m$^3$ ($dB_{\mathrm{z}}/dz$) was $-279(64)~\mathrm{pT/m}$. With additional improvement to the idealization, and with active compensation, we expect the room to be adequate for a $10^{-27}~e\mathrm{cm}$ nEDM search.
format	Preprint
id	arxiv_https___arxiv_org_abs_2604_15565
institution	arXiv
publishDate	2026
record_format	arxiv
spellingShingle	Initial Performance of the TUCAN Magnetically Shielded Room Ahmed, S. Algohi, B. Anthony, D. Berard, P. Barron-Palos, L. Bosse, M. Brossard, A. Chak, J. Curtis, R. Davis, C. de Vries, R. Dong, K. Dowie, B. Drury, K. Fierlinger, P. Franke, B. Fujimoto, D. Fujitani, R. Giampa, P. Gibson, C. Golub, R. Hatanaka, K. Hepworth, T. Higuchi, T. Hussain, J. Jaison, A. Katotoka, M. Kawasaki, S. Klassen, W. Klemets, E. Korkmaz, E. Korobkina, E. Kuchler, F. Lavvaf, M. Lindner, T. Lo, N. Malcolm, J. Mammei, R. Marshall, C. Martin, J. Matsumiya, R. McCrea, M. Miller, E. Miller, M. Mishima, K. Mohammadi, T. Murby, N. Pankratz, S. Picker, R. Qiao, K. Reimer, T. Sankaran, A. Schreyer, W. Sidhu, S. Smith, L. Stargardter, S. Stutters, R. Switzer, P. Tushar van der Veek, B. Vanbergen, S. van Oers, W. T. H. Woolger, D. Yazdandoost, N. Ye, Q. Zahra, A. Zhao, M. Instrumentation and Detectors The TRIUMF Ultracold Advanced Neutron (TUCAN) collaboration has commissioned a large magnetically shielded room to be used for measuring the neutron electric dipole moment (nEDM) to a precision of $10^{-27}~e\mathrm{cm}$. The room is composed of five layers of MuMetal and one layer of copper and sits within the $\lesssim 370~μ\mathrm{T}$ ambient field produced by the TRIUMF cyclotron. Within this environment, the quasi-static shielding factor was measured to be $3.25(2) \times 10^4$ at $0.01~\mathrm{Hz}$ with an external peak-to-peak perturbation of $2~μ\mathrm{T}$. Without the large ambient cyclotron field, the shielding factor improves to $3.75(4)\times 10^4$ at the same perturbation amplitude and frequency. After idealization in the cyclotron field, the residual field at the room center was $B = 1.8(2)~\mathrm{nT}$ and the vertical first-order gradient across the central 1~m$^3$ ($dB_{\mathrm{z}}/dz$) was $-279(64)~\mathrm{pT/m}$. With additional improvement to the idealization, and with active compensation, we expect the room to be adequate for a $10^{-27}~e\mathrm{cm}$ nEDM search.
title	Initial Performance of the TUCAN Magnetically Shielded Room
topic	Instrumentation and Detectors
url	https://arxiv.org/abs/2604.15565