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KAGRA Timing System

Note of the Meeting with Zsuzsa (Jul 15, 2016 at Columbia University)

Suggestions (random order)

• You may not want more IRIG-B boards because there is Dsub output on the back of IRIG-B board with which we can convert to BNC to use more outputs.
• It's better to connect two GPS antennas to Master board so that one can be used when the other signal is lost.
• In the master board, VCXO is not available in the market anymore. However Szusza has spares.
• In the comparator board, there is one chip which gets very hot. Make sure to cool it down.
• Check if the leap second is correctly compensated in the oldest IRIG-B (one arrived on 5/7/2012, installed in the front room). iKAGRA timing might have been off 1 sec!

Reference

LIGO Documents

• Timing System Document Map Advanced LIGO

• Quick Start Guide Optical Timing Distribution System Advanced LIGO

• Timing Master Module/Fanout Module

  • Circuit Schematic

• Slave Module