As a promising tool for ultrafast material analyses, we propose to utilize
the X-ray pulse which may be generated in a quite simple manner using subpi
cosecond electron linacs. The properties of the X-ray were numerically stud
ied with the EGS4 code. Verification of the X-ray generation was also condu
cted at the Nuclear Engineering Research Laboratory (NERL) linac and clear
diffraction patterns of characteristic X-ray were obtained for typical sing
le crystals. (C) 2000 Elsevier Science B.V. All rights reserved.