A fast-switching magnet serving a spallation-driven ultracold neutron source
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~A 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~s 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.
Cite
@article{arxiv.1905.08857,
title = {A fast-switching magnet serving a spallation-driven ultracold neutron source},
author = {S. Ahmed and E. Altiere and T. Andalib and M. J. Barnes and B. Bell and C. P. Bidinosti and Y. Bylinsky and J. Chak and M. Das and C. A. Davis and F. Fischer and B. Franke and M. T. W. Gericke and P. Giampa and M. Hahn and S. Hansen-Romu and K. Hatanaka and T. Hayamizu and B. Jamieson and D. Jones and K. Katsika and S. Kawasaki and T. Kikawa and W. Klassen and A. Konaka and E. Korkmaz and F. Kuchler and L. Kurchaninov and M. Lang and L. Lee and T. Lindner and K. W. Madison and J. Mammei and R. Mammei and J. W. Martin and R. Matsumiya and E. Miller and T. Momose and R. Picker and E. Pierre and W. D. Ramsay and Y. -N. Rao and W. R. Rawnsley and L. Rebenitsch and W. Schreyer and S. Sidhu and S. Vanbergen and W. T. H. van Oers and Y. X. Watanabe and D. Yosifov},
journal= {arXiv preprint arXiv:1905.08857},
year = {2019}
}
Comments
16 pages, 21 figures