1. S. K. Vyas, R. K. Verma, S. Maurya, and V. V. P. Singh, Frequenz 70, 455 (2016).
2. A. C. Dexter, in Proceedings of the LINAC Conference,2014 (Geneva, Switzerland, 2014), p. 751.
3. G. Kazakevich, R. Johnson, M. Neubauer, V. Lebedev, W. Schappert, and V. Yakovlev, in Proceedings of the IPAC Conference,2017 (Copenhagen, Denmark, 2017), p. 4386.
4. H. Wang, R. A. Rimmer, R. Nelson, M. Neubauer, A. Dudas, B. R. Coriton, and C. P. Moeller, in Proceedings of the IPAC Conference,2019 (Melbourne, Australia, 2019), p. 2233.
5. Yu. D. Chernousov, V. I. Ivannikov, I. V. Shebolaev, V. A. Bolotov, and Yu. Yu. Tanashev, Instrum. Exp. Tech. 62, 289 (2019).