Dassault/Thales Event timers l Designed for the T2L2 project l Running in LLR since 1995 l 2 versions : 5 & 2 ps rms l 200 MHz frequency synthesis

Dassault Event timer Time Stability Synchronous measurement

Dassault Event timer Temperature drift

OCA Event Timer Ground design

Time stability

Thermal sensitivity

Spectral density of the vernier linearity error Linearity: 1 ps rms, +/- 1.5 ps

Vernier linearity Linearity : 1 ps rms, +/- 1.5 ps

OCA Event Timer Preliminary Space Design (EREMS) for T2L2 l Instrument Architecture »Timer »Photo detection »Power converter »Computer l Mass: 7 kg l Size: 250  240  130 mm 3 l Power: 40 W

OCA Event Timer Ground Design l Derivated from the space design l Same performances l Development plan : 01/2007 – 01/2008