PURPOSE: To increase the extent of position detecting sensitivity by installing a fluorescent X-ray radiator on an optical axis of synchrotron radiation light, detecting the fluorescent X-ray being emitted with two detectors each, and finding a beam position from each output signal.
CONSTITUTION: A copper rod 1 or a fluorescent X-ray radiator makes an angle on an optical axis acute with a triangular section doubling as a linear symmetry to the optical axis of synchrotron radiation light correctly irradiates the copper rod 1 without entailing any dislocation, each quantity of both first and second fluorescent X-rays being detected by first and second detectors 2, 3 is the same, so that each of output signals (a), (b) of these two detectors 2, 3 becomes equalized. Accordingly, with an output signal out of an arithmetic circuit 4 monitored, a beam position of the synchrotron radiation light is accurately detectable.
AMAMIYA MITSUAKI
WATANABE YUTAKA
