Accelerator bunch length measurements

With the improvement of technology, many new accelerator bunch length measurement methods are invented in recent years, such as streak camera, Martin-Puplett interferometer, electro-optic detection, frequency domain method. Each method has ks respective advantages, disadvantages and applied domains. A review on various bunch-length measurement methods is given in this paper. At present many large accelerators in the world universally use streak camera to measure bunch length. For beam bunches of ultrashort duration, optic technology and frequency domain method are adopted, and the resolution of some methods can reach to the order of femtosecond. (authors)