Figure 3
The responsivity of the MCP detector compared with the X-ray pulse energy calculated from the LCLS upstream gas detector and gas attenuator. The solid lines represent linear fits: y = cx. (a) At a photon energy of 1540 eV, a negative bias was applied with the MCP input voltage varied from −800 V to −1500 V. (b) At a photon energy of 1480 eV, a positive bias was applied with the anode voltage varied from 1100 V to 1550 V. |