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TTC system for FP420 reference timing?

The TTC system controls timing signals critical for E-W detectors with minimal jitter. It includes clock monitoring, radiation-hard chips, optical signal transmission, and precise jitter values. Key components are TTCrx, QPLL, TRR receiver, and radiation-resistant fibers. The system ensures synchronization for accurate data collection in high radiation environments.

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TTC system for FP420 reference timing?

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  1. TTC system for FP420 reference timing? TTC = Timing Trigger Control The reference time, common signal to E and W detectors is as important as the detectors themselves. Want < ~ 5 ps E-W jitter Sophie Baron (PH-ESS) & Mike Albrow (Fermilab)

  2. Bunch Clock and Orbit to be transmitted Level of radiation = ?? …. We will need calculation of this. (Results here) Clock monitoring between the 2 signals Goal: ~5 ps rms jitter skew between the clocks in W and E WILL DO Not really needed

  3. The TTC system Rad-hard chips Monitoring the phase between 2 optical signals Various transmission schemes used by the TTC system Typical jitter values Existing system

  4. …and a lot of various components and modules… This is standard equipment provided by LHC for experiments: TTC system in one slide Transmission of… • Timing of the LHC from the RF source to the experiments • LHC Bunch Clock (40.078xx MHz) • Revolution Frequency (11.245x kHz) Then combined inside the experiments with … • TriggerandControlsignals • Used by front-end electronics and readout systems …Using single optical fibres…

  5. Clock and orbit on parallel fibres RF signal transmission scheme Laser Types OCP03: 300 $ OCP Tx 24: 600 $ Parallel Scheme Picture RF_Tx_D Picture RF_Rx_D Tx Board Rx Board • Photodiode Types • OCP Rx 03: 230 $ • OCP Rx 24: 300 $ • TRR: 8 CHF!

  6. Comparator control Typical Jitter values – Parallel Scheme C1 OCP Tx 03 C3 C2 OCP Rx 03 + fanout +ECL driver OCP Rx 03 + fanout +ECL driver C1/C3 11.4ps C2/C3 4.0ps C1/C2 11.5ps Lecroy Wavepro 7100 1GHz

  7. Conclusions There is a Reference time signal solution with East-West rms <~ 5 ps. Proposal will be written for TDR by Sophie Baron in consultation with MGA ( + anyone interested). We should ask for this to be provided by CERN (will FP420 have to pay something? If so, modest.)

  8. TTCrx: 50ps rms The TTCrx is now fabricated in the radiation-hard DMILL technology, which completely eliminates the possibility of a single-event latch-up, and should show a high immunity to single-event upset (SEU). Tested up to : 8 Mrad (X-Rays) and – 5 x1013 n/cm2 (Neutrons) QPLL: 10-15ps rms Tested up to 10Mrad (Co-60 γ) + 3 1015 n/cm2 TRR receiver: Optical receiver from Truelight (Taiwan) selected for most of the TTC designs Tested with the TTCrx at the same doses. OK if the optical power level stays above -20dBm (0.1mW) Optical Fibers: sensitive to radiation (attenuation increases with the dose) Special fibres validated for ATLAS and CMS at high radiation levels (1014-1015 n cm-2 and total dose of 100 to 300 kGy) Radiation hardness of multi-mode optical fibres for the ATLAS detector readout (June 1999,DG Charlton et all) Radiation hard components Phased locked loop: voltage controlled Quartz crystal oscillator (VCXO)

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