Quick Shot

The Osaka University electron spectrometer (OU-ESM) measures fast electrons produced during fast-ignition experiments. Developed by a group headed by Professor Kazuo Tanaka at the Institute of Laser Engineering, Japan, it is a ten-inch manipulator–based diagnostic for the OMEGA target chamber. The OU-ESM is capable of measuring escaping electrons with different view angles covering 25° in 5° increments, over a few tens-of-MeV detection range with high-energy resolution. A very strong magnetic field (4.5 kilogauss between the poles) disperses the electron spectrum onto an image plate detector.