Figure 3
X-ray spectrum analysis.
The blue squares and black circles denote the measured average photon number produced with nitrogen and helium gases, respectively. The blue dashed line shows the fitted spectrum for nitrogen gas with the critical energy of 75 keV. The red and green dashed lines represent the x-ray spectra from refs 12 and 13, which correspond to self-injection (SI) non-resonance and resonance. The inset in the figure shows the x-ray signal strength on consecutive IPs. The black squares and red circles represent the experimental signal and the calculated value using the synchrotron radiation distribution, respectively. The blue triangle shows the experimental x-ray signal with helium gas.
