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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

MO

Master Oscillator

NC

Normal-Conducting

RF

Radio Frequency

SC

Super-Conducting

SHM

Shelf Manager

VMTG

VME-based Master Trigger Generator

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The 476MHz Master Oscillator (MO) provides an RF signal to the timing system.  This signal is combined with a 360Hz signal derived from the a sequencer chassis (i.e. derives a 360Hz signal coincident with the zero crossings from the 3-phase AC power line signal (from the a sequencer chassis) at the inputs of the VME-based Master Trigger Generator (VMTG).  The VMTG output is synchronized with the MO 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).

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