The Particle Beam Physics Lab (PBPL) at UCLA is developing a single-shot rel-ative bunch length monitor system for the Linac Coherent Light Source (LCLS)X-ray Free Electron Laser at SLAC. To ensure high-quality lasing, feedback systemsare needed. The bunch length monitor system will be a crucial part of the linaclongitudinal feedback system, which is necessary to keep the final peak beam cur-rent stable. The system will consist of two single-channel detector arrangements,one after each bunch compressor, and will use the coherent synchrotron radiation(CSR) and coherent edge radiation (CER) from bunch compressor chicane dipolemagnets to monitor the bunch length. Details of the system are presented, withan emphasis on the device for bunch compressor one (BC1), and the system iscompared to alternatives. Plans for testing are presented as well.
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