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Schematic diagram of the beamline BL3 at SACLA and the present experimental set-up. UND: undulator; M1 and M2: plane mirrors made of silicon; AT: silicon mono-crystal attenuators with thicknesses of 0.1 mm to 3 mm; XGMD: x-ray gas monitor detector; BPM: beam position monitor; CR: cryogenic radiometer.
Spectral responsivity of the BPM detector of SACLA. Symbols: measured data points taken from Table I; line: smoothed linear interpolation.
Correlation between the results of CR and the BPM at the photon energies of 9.6 keV (square) and 13.6 keV (circle). X-axis: pulse energy from the CR, Y-axis: output signal from the BPM. The lines are results of fits using linear functions.
FEL pulse energy measured as a function of the thickness of the silicon attenuation filter measured at the photon energy of 4.4 keV (solid circle), 5.8 keV (solid triangle), and 9.6 keV (solid square). The lines represent the Beer‐Lambert law with the attenuation coefficient of the fundamental (solid line) and of the third harmonic (dashed line).
Average pulse energy of SACLA for different photon energies as measured with the CR and the XGMD and calibration coefficient of the SACLA BPM.
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