Strategy for long-term support of the TTC system

1. Strategy for long-term support of the TTC system 7th July 2005 LECC / Sophie BARON-PH/ESS

2. Brief statusTTC upgrade principle AB/RF and experiment conditions Implementation proposalProposed procedure LECC / Sophie BARON-PH/ESS

3. Initial Scheme Present Scheme RF transmitters 3 or 6 fibres needed (5 compensated only) RF receivers • 4 crates: • 1 TTC • 1 TTC/SPS • 1 TTC spare • 1 BST • 4 crates: • 1 TTC ring 1 • 1 TTC ring 2 • 1 TTC ref? • 1 TTC spare Encoded BC & Orbit 1 + spare 2/3 + spare TTC status • Backbone: from SR4 to the experiments LECC / Sophie BARON-PH/ESS

4. TTC system status • The TTC transmission crates (in CCC) are obsolete • Only 4 crates • 3 BC and Orbit to be transmitted => ONE SPARE • Some lasers are ageing… • …and are obsolete as some other components • Some schematics are missing • Same problem for the receiving crates in experiments and labs • Only 12 crates, and also getting obsolete • 3 TTCmi needed per experiment => NO SPARE • We are crucially missing remote monitoring LECC / Sophie BARON-PH/ESS

5. Brief status TTC upgrade principle AB/RF and experiment conditions Implementation proposalProposed procedure LECC / Sophie BARON-PH/ESS

6. AB/RF transmitters Optical links AB/RF receivers New Receiver crate TTC backbone: proposal from AB/RF • Extension of the AB/RF optical transmission link AB/RF transmitters Optical links AB/RF receivers TTC transmitter crates • Advantages: • Only one design to be done on the PH/TTC side to replace the TTCmi • On-call support ensured by the AB/RF piquet team • To be compared to a simple redesign of the system: • 2 modules to be designed (transmitter crate + TTCmi) • Nobody in PH for the on-call support on the TTC transmitter crates (a piquet service is 6 people) Optical links TTCmi LECC / Sophie BARON-PH/ESS

7. Upgrade of the TTCmi To be specified with the experiments: • Receive the 3 BC and Frev from the AB/RF optical receivers (sinusoidal signals) • Convert them into a logic standard (LVDS or LVPECL) • Clean the BC signals with a PLL • Stretch the Frev to the desired length and synchronize it to the BC • Provide a stand alone frequency when the BCs are not provided by the RF (mostly outside physics). To achieve this aim, 2 solutions are possible: • Machine timing events with • the BST system from AB/BDI, or • the GMT system from AB/CO, or • provide a fake BC out of the physics period (after beam dump and before beam injection) • Detect the missing clock (out of locking range) and provide a fake BC if necessary • Fan out the BCs and the Orbit • Monitor signal quality (PLL lock, orbit presence, ..) via VME • Control the phase of the recovered BC, as well as the phase of the incoming orbit via VME • … => performances must be equal or better than current TTCmi crate Philippe Baudrenghien AB/RF

8. Brief status TTC upgrade principle AB/RF and experiment conditionsImplementation proposalProposed procedure LECC / Sophie BARON-PH/ESS

9. AB/RF & Experiment conditions LECC / Sophie BARON-PH/ESS

10. Brief status TTC upgrade principle AB/RF and experiment conditions Practical ImplementationProposed procedure LECC / Sophie BARON-PH/ESS

11. Practical implementation • AB/RF equipment • Tx/rx pair: a priori, the Miteq 3GHz LBL fibre optical link has been evaluated • Measured jitter for 8km of buried fibre: 1 ps pk-pk => do not add any extra jitter • Optical power = 6 dBm (4 mW) • 5000 Euros (7770 CHF) per tx/rx pair • Fibre routing • Experiments are in favour of the “tunnel” scheme (to avoid thermal drift), but… • Chosen scheme will be linked to the radiation level and the tx power budget LECC / Sophie BARON-PH/ESS

12. Practical implementation • New receiver crate – replacing the TTCmi RF2TTC converter module: converts, cleans, synchronizes, selects and transmits the BC and Orbit to the trigger electronics of the experiments • 2 AB/RF receiver modules (each one equipped with 2 optical receivers) • 1 spare? (used for extra orbits) VME 6U crate with a standard VME64 backplane If the GMT solution is chosen: CTRP mezzanine from AB/CO BOBR module if the BST solution is chosen Electrical fanout Crate Controller Max: 5/6 modules per crate, including the crate controller LECC / Sophie BARON-PH/ESS

13. Practical implementation • Support organisation: • AB/RF will be responsible for: • The maintenance and the support of their equipment • Spares policy to be defined in collaboration with them • The piquet needs to have access to this equipment • Remotely by ethernet • Physically to exchange the modules Special case of ALICE (no access during runs) to be solved • PH/ESS will be responsible for: • The design, maintenance and off-line support of the new VME modules • The software for AB/RF and new reception modules interface • The support of the RD12 - TTC transmitter crates in CCC • The maintenance (with the stock of obsolete components we have in Bruce’s cupboard) of the RD12 - TTC equipment • Experiments will be responsible for: • The on-line support on the new receiver crate – except the AB/RF modules LECC / Sophie BARON-PH/ESS

14. Practical implementation • responsibilities LECC / Sophie BARON-PH/ESS

15. Practical implementation WHO PAYS? • Price: first estimation per experiment UPGRADE WITH AB/RF Tx/Rx BASIC UPGRADE LECC / Sophie BARON-PH/ESS

16. Brief status TTC upgrade principle AB/RF and experiment conditions Practical ImplementationProposed procedure LECC / Sophie BARON-PH/ESS

17. Approval in principle Agreement of experiments on the document Agreement of the AB/RF Formal signature (EDMS) Procedure • Specifications of new reception module in collaboration with the experiments • Design – autumn 05 • To be tested during the structured test beam in September 2006 • The software to be written in parallel (M. JOOS) • The current system will be back in place as soon as the CCC is available • Maintained for the structured test beam in parallel to the new system • Compatibility with current AB/RF scheme to be ensured for the LHC start • Will be running in parallel to the new system until its complete validation LECC / Sophie BARON-PH/ESS