A new Trigger/GPS Unit for the EEE Project

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Presentation transcript:

A new Trigger/GPS Unit for the EEE Project A. Corvaglia M. Panareo M.P. Panetta (M. Rizzi)

A new Trigger/GPS Unit for the EEE Project Abstract Introduction – the EEE Project The EEE Data Acquisition A brief introduction of the old System EEE Trigger/Gps System Trigger System GPS Interface Event Time Stamp Time Stamp jitter Δt measurements beetwen 2 different boards (same VME Crate, same length cable) with the aim of evaluate the PPS resolution σPPS ( 30 ns). The global Time Stamping resolution should be the sum of the TDC resolutions σTDC (100 ps TDC resolution) and of PPS resolution σPPS Conclusions Trigger/Gps Board 2 Trigger/Gps Board 1 ˜ Δt = tPPS1 – tPPS2 PPS resolution σPPS entries

A new Trigger/GPS Unit for the EEE Project Time Stamp jitter 20 Trigger/GPS Boards in the Electronic Lab. at Lecce The bracket was mounted, the other GPS antenna was mounted 20 Boards already tested 5 under test Trigger/Gps Board 1 Trigger/Gps Board 2 Δt = tPPS1 – tPPS2 σPPS entries

~ 13 ns Time Stamp jitter Boards N. 5 - N.4 ΔPPS = tPPS1 – tPPS2 Δ1PPS(mean) = 21,3 ns σ1PPS(mean) = 4,79 ns T = 90000 s Length difference between the Antenna cables = 2,7 m ~ 13 ns

Time Stamp jitter Boards N. 5 - N.4 ΔPPS = tPPS1 – tPPS2 Δ1PPS(mean) = 21,3 ns σ1PPS(mean) = 4,79 ns T = 90000 s Drift of ΔPPS during 1 day Bin width =300 s

Time Stamp jitter Boards N. 5 - N.2 Length difference between the Antenna cables = 2,7 m (~ 13 ns ) ΔPPS = tPPS1 – tPPS2 Δ1PPS(mean) = 17,4 ns ; σ1PPS(mean) = 6,06 ns ; T ~ 24000 s ΔPPS = tPPS1 – tPPS2 Drift of ΔPPS during 7 h Bin =300 s

Time Stamp jitter Boards N. 4 - N.2 Length difference between the two Antenna cables = 2,7 m (~ 13 ns ) ΔPPS = tPPS1 – tPPS2 Δ1PPS(mean) = 16,8 ns σ1PPS(mean) = 4,48 ns T ~ 54000 s ΔPPS = tPPS1 – tPPS2 Drift of ΔPPS during 15 h Bin =300 s

Measurements of 8 couples Time Stamp jitter ΔPPS = tPPS1 – tPPS2 Measurements of 8 couples σΔ1PPS distribution σ Δ 1PPS ΔPPS_MEAN entries 3,5 4,5 5,5 ns 10 20 30 ns Length difference between the two Antenna cables = 2,7 m (~ 13 ns )

To be check…