Double focusing lens streak tube with wide dynamic range

With the development of the ICF experiment, a streak camera with a wider dynamic range is required. A double focusing lens streak tube with wide dynamic range is designed to satisfy this requirement. Technical parameters of the tube are obtained by optimizing the electrode sizes and voltages values. The deflection sensitivity is 39 mm/kV. The spatial resolution is better than 30 lp/mm in the middle of the photocathode and better than 10 lp/mm at the edge. The time resolution is about 10 ps. The effective length of the photocathode is 30 mm, the magnification is 1.3. Some measures are taken to improve dynamic range, including enhancing the on-axis potential and decreasing the electrode length. As a result, the minimum on-axis potential reaches 5 kV and the flying time of electrons from photocathode to screen is only 6.62 ns. A tube is made based on the designed size. The primary parameters are obtained by testing the tube. The actual voltage values applied to electrodes are almost the same as the designed values. The tested deflection sensitivity is 40 mm/kV and the magnification is 1.35, which both consist with the designed parameters.