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TTC system for FP420 reference timing?

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). Bunch Clock and Orbit to be transmitted

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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 Proposed Scheme for Reference Time transmission 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. 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)

  6. Encoded TTC inside the experiments (based on aTTCrx chip) Advantage: Allows to encode the orbit signal (and control frames) to the 40.078MHz Drawback: jitter increases with the quantities of encoded data QPLL added to reduce the jitter of the recovered clock down to 10-15ps rms We choose the alternative, better resolution: Parallel TTC backbone system Orbit and clock on separate fibres Advantage: very low jitter after the opto-electrical conversion (<10ps) without using the QPLL Transmission Schemes

  7. 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!

  8. 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

  9. 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 Proposed Scheme for Reference Time transmission WILL DO Not really needed

  10. 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.)

  11. 6th Workshop • Small x and Diffractive Physics • 28-31 March 2007 • Fermi National Accelerator Laboratory, Batavia, Illinois, USA • Just preceding FP420 April 2-3 UTA (Texas) • The purpose of the Workshop is to present and discuss experimental,phenomenological • and theoretical progress in high energy diffractive interactions. • Results from the Tevatron, HERA and RHIC covering small-xphenomena in the nucleon and nuclei, large rapidity gaps, as well asrelevant cosmic ray interactions will be presented. Attention will be paidto the possibilities of measuring exclusive Higgs bosons, vector bosonpairs, and Beyond Standard Model phenomena at the LHC with forward protonspectrometers." • Organizing Committee: M.G.Albrow*(FNAL),J.Bartels(Univ.Hamburg), A.Brandt(UTA), • A.DeRoeck(CERN), K.Eggert(CERN),K.Goulianos(Rockefeller Univ.), W.Guryn(BNL), • J.Huston(MSU), L.McLerran(BNL), R.Orava(Helsinki),J.Repond(ANL),C.Royon*(Saclay), • M.Ruspa(Torino), C.Sazama(FNAL) * Co-chairs • Contact Information: C.Sazama, P.O.Box 500, MS 113, Batavia IL 60510 • tel: 630-840-4102, email: sazama@fnal.gov • need this from Christophe: http://conferences.fnal.gov/smallx07 Sponsored by Fermi National Accelerator Laboratory * Office of Science/U.S.Department of Energy* Managed by Fermilab Research Associates

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