Correction to: Radiat Detect Technol Methods https://doi.org/10.1007/s41605-017-0001-7; https://doi.org/10.1007/s41605-017-0018-y; https://doi.org/10.1007/s41605-017-0021-3; https://doi.org/10.1007/s41605-017-0015-1

The original version of these four articles as below unfortunately contained a mistake. The category “Review” was incorrect. The correct category is “Original Paper”.

Radiat Detect Technol Methods (2017) 1:1, “Optimizing the RF cavity parameters at CSNS-II with Particle Swarm Optimization”.

Radiat Detect Technol Methods (2017) 1:14, “Trigger and noise filtering algorithms for the LHAASO water Cherenkov detector array”.

Radiat Detect Technol Methods (2017) 1:17, “Hall sensor angle error and relative position calibrations for cryogenic permanent magnet undulator of high energy photon source test facility (HEPS-TF)”.

Radiat Detect Technol Methods (2017) 1:20, “Multi-physics analysis of a 325-MHz bi-periodic on-axis coupled accelerating structure”.