Inverse
Compton scattering hard X-ray source for 10¬-50 keV are under construction
using the X-band (11.424 GHz) electron linear accelerator and YAG laser
at Nuclear Professional School, University of Tokyo. This work is a
part of the national project on the development of advanced compact
medical accelerators in Japan. National Institute for Radiological Science
is the host institute and U. Tokyo and KEK are working for the X-ray
source. Main advantage is to produce tunable monochromatic hard (10-50
keV) X-rays with the intensities of 10^8-10^9 photons/s (at several
stages) and the tabletop size. In addition, dual energy monochromatic
X-ray source can be realized that generate two monochromatic hard X¬-rays
with high (up to 10 pps) repetition rate by one X-ray source.
The X-ray yield by the electron beam and Q-switch Nd:YAG laser of 2.5
J/10 ns is 10^7 photons/RF pulse (10^8 photons/sec at 10 pps). X-band
beam line for the demon¬stration is under commissioning. We also
design to adopt a technique of laser circulation to increase the X-ray
yield up to 10^8 photons/pulse (10^9 photons/s). The whole system is
to be constructed till this fall. Dual energy X-ray CT and subtraction
CT for medical and industrial uses will be performed later.