| Paper | Title | Page |
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TUPB55 |
S-band Timing Diagnostic at the LCLS | |
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Funding: DOE Timing and synchronization at the LCLS is a multiple tiered process with various hardware and software systems, which are functionally independent. This autonomy has resulted in timing errors observed by LCLS users. Coherent laser timing jumps have occurred during cycles of unlocking-locking the Femtolock box. The software does not monitor the state of the Femtolock and these jumps occur when the laser SPAC (on 476 MHz) rotates the reference phase larger than 350ps (one cycle of 2856 MHz). A diagnostic was developed to accurately measure the time difference between the timing fiducials and the beam-induced signal from the toroids in the LCLS injector. This diagnostic has a timing has 40ps and detects these timing jumps as they occur. |
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