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

S. Ahmed, E. Altiere, T. Andalib, M. J. Barnes, B. Bell, C. P. Bidinosti, Y. Bylinsky, J. Chak, M. Das, C. A. Davis, F. Fischer, B. Franke, M. T.W. Gericke, P. Giampa, M. Hahn, S. Hansen-Romu, K. Hatanaka, T. Hayamizu, B. Jamieson, D. JonesK. Katsika, S. Kawasaki, T. Kikawa, W. Klassen, A. Konaka, E. Korkmaz, F. Kuchler, L. Kurchaninov, M. Lang, L. Lee, T. Lindner, K. W. Madison, J. Mammei, R. Mammei, J. W. Martin, R. Matsumiya, E. Miller, T. Momose, R. Picker, E. Pierre, W. D. Ramsay, Y. N. Rao, W. R. Rawnsley, L. Rebenitsch, W. Schreyer, S. Sidhu, S. Vanbergen, W. T.H. Van Oers, Y. X. Watanabe, D. Yosifov

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

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, low-inductance 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.

Original languageEnglish
Article number102401
JournalPhysical Review Accelerators and Beams
Volume22
Issue number10
DOIs
StatePublished - Oct 11 2019
Externally publishedYes

Funding

The authors thank C. Marshall, C. A. Miller, J. Pon, D. Preddy, and C. A. Remon for their important contributions to this work. This work was undertaken, in part, thanks to funding from the Natural Sciences and Engineering Research Council Canada, the Canada Research Chairs program, and the Canada Foundation for Innovation. [1] 1 R. Golub and J. Pendlebury ,

FundersFunder number
Natural Sciences and Engineering Research Council of Canada
Canada Foundation for Innovation
Japan Society for the Promotion of Science18H05230
Canada Research Chairs

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