Acronyms
Term | Description |
|---|---|
AC | Alternate Current |
ATCA | Advanced Telecommunications Computing Architecture |
CPU | Central Processing Unit |
EPICS | Experimental Physics and Industrial Control System |
FPGA | Field Programmable Gate Array |
IOC | Input Output Controller |
LCLS | Linac Coherent Light Source |
MDL | Main Drive Line |
NC | Normal-Conducting |
RF | Radio Frequency |
SC | Super-Conducting |
SHM | Shelf Manager |
VMTG | VME-based Master Trigger Generator |
Objective
Timing System Description
The 476MHz Master Oscillator provides an RF signal. This is combined with the 360Hz 3-phase power line signal (from the a sequencer chassis) at the inputs of the VME-based Master Trigger Generator. The VMTG output is synchronized with the 476MHz via a 71kHz RF signal and it triggers the fiducial generator at 360Hz. The 360Hz output of the fiducial generator is amplitude-modulated onto the original 476MHz signal (hence 2.78ms between peaks and with a 476MHz frequency) and is propagated down the Main Drive Line (MDL).
Linac Locking Description
Overview
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