Brightness enhancement of a linac-based intense positron beam for total-reflection high-energy positron diffraction (TRHEPD)Masaki Maekawa, Ken Wada, Yuki Fukaya, Atsuo Kawasuso, Izumi Mochizuki, Tetsuo Shidara and Toshio HyodoEur. Phys. J. D, 68 6 (2014) 165DOI: https://doi.org/10.1140/epjd/e2014-40802-7