A new JAEA beamline with an in‐vacuum undulator has been constructed at BL22XU in SPring‐8. The wide band energy X‐rays facilitate crystal structure studies under pressure, resonant X‐ray scattering experiments, X‐ray absorption fine structure as well as stress measurements. The energy range from 3 to 70keV with a high flux of X‐rays has been achieved at the beamline, using two sets of double crystal monochromators equipped with liquid nitrogen cooling Si (111) crystals. The photon flux at 3, 9, 25 and 70keV with ΔE/E ≒ 10−4 are about 2 × 1010, 3 × 1013, 5 × 1012 and 5 × 1010 photons/sec, respectively. Fluctuations in X‐ray intensities and position caused by the liquid nitrogen cooling system have been prevented by using MOSTAB, a feedback control system.

Topics
Stress measurement, Feedback control system, Crystal monochromators, Insertion device, Chemical elements, X-ray absorption fine structure, X-ray scattering
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© 2007 American Institute of Physics.
2007
American Institute of Physics
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