TTC Timing Trigger Control TTC system for FP
- Slides: 8
TTC = Timing Trigger Control TTC system for FP 420 reference timing? 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) Mike Albrow & Sophie Baron FP 420 UTA March 07 1
WILL DO Not really needed § § 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 Mike Albrow & Sophie Baron FP 420 UTA March 07 2
Existing system § § § The TTC system Rad-hard chips Monitoring the phase between 2 optical signals Various transmission schemes used by the TTC system Typical jitter values Mike Albrow & Sophie Baron FP 420 UTA March 07 3
system in one slidefor experiments: This is standard TTC equipment provided by LHC Transmission of… § Timing of the LHC from the RF source to the experiments o LHC Bunch Clock (40. 078 xx MHz) o Revolution Frequency (11. 245 x k. Hz) Then combined inside the experiments with … § Trigger and Control signals § Used by front-end electronics and readout systems …Usingle optical fibres… …and a lot of various components and modules… Mike Albrow & Sophie Baron FP 420 UTA March 07 4
Parallel Scheme § Clock and orbit on parallel fibres § RF signal transmission scheme Picture RF_Tx_D Picture RF_Rx_D Tx Board Rx Board § Laser Types o OCP 03: 300 $ o OCP Tx 24: 600 $ Mike Albrow & Sophie Baron § Photodiode Types o OCP Rx 03: 230 $ o OCP Rx 24: 300 $ o TRR: 8 CHF! FP 420 UTA March 07 5
Typical Jitter values – Parallel Scheme C 1 OCP Tx 03 C 2 Comparator control OCP Rx 03 + fanout +ECL driver C 1/C 2 11. 5 ps C 1/C 3 11. 4 ps OCP Rx 03 + fanout +ECL driver C 2/C 3 4. 0 ps Lecroy Wavepro 7100 1 GHz Mike Albrow & Sophie Baron FP 420 UTA March 07 6
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 FP 420 have to pay something? If so, modest. ) Mike Albrow & Sophie Baron FP 420 UTA March 07 7
Radiation hard components § TTCrx: o 50 ps rms o The TTCrx is now fabricated in the radiation-hard DMILL technology, which completely eliminates the possibility of a singleevent latch-up, and should show a high immunity to single-event upset (SEU). o Tested up to : 8 Mrad (X-Rays) and – 5 x 1013 n/cm 2 (Neutrons) § QPLL: Phased locked loop: voltage controlled Quartz crystal oscillator (VCXO) o 10 -15 ps rms o Tested up to 10 Mrad (Co-60 γ) + 3 1015 n/cm 2 § TRR receiver: o Optical receiver from Truelight (Taiwan) selected for most of the TTC designs o Tested with the TTCrx at the same doses. o OK if the optical power level stays above -20 d. Bm (0. 1 m. W) § Optical Fibers: o sensitive to radiation (attenuation increases with the dose) o Special fibres validated for ATLAS and CMS at high radiation levels (1014 -1015 n cm-2 and total dose of 100 to 300 k. Gy) o Radiation hardness of multi-mode optical fibres for the ATLAS detector readout (June 1999, DG Charlton et all) Mike Albrow & Sophie Baron FP 420 UTA March 07 8
