Strategy for long-term support of the TTC system 07/07/2005 Strategy for long-term support of the TTC system 7th July 2005 03/06/2005 LECC / Sophie BARON-PH/ESS

LECC / Sophie BARON-PH/ESS 07/07/2005 Brief status TTC upgrade principle AB/RF and experiment conditions Implementation proposal Proposed procedure 03/06/2005 LECC / Sophie BARON-PH/ESS

LECC / Sophie BARON-PH/ESS 07/07/2005 TTC status Backbone: from SR4 to the experiments Encoded BC & Orbit Initial Scheme 4 crates: 1 TTC 1 TTC/SPS 1 TTC spare 1 BST 1 + spare Present Scheme 4 crates: 1 TTC ring 1 1 TTC ring 2 1 TTC ref? 1 TTC spare RF transmitters RF receivers 2/3 + spare 3 or 6 fibres needed (5 compensated only) 03/06/2005 LECC / Sophie BARON-PH/ESS

LECC / Sophie BARON-PH/ESS 07/07/2005 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 03/06/2005 LECC / Sophie BARON-PH/ESS

LECC / Sophie BARON-PH/ESS 07/07/2005 Brief status TTC upgrade principle AB/RF and experiment conditions Implementation proposal Proposed procedure 03/06/2005 LECC / Sophie BARON-PH/ESS

TTC backbone: proposal from AB/RF 07/07/2005 TTC backbone: proposal from AB/RF Extension of the AB/RF optical transmission link AB/RF transmitters Optical links AB/RF receivers New Receiver crate 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 03/06/2005 LECC / Sophie BARON-PH/ESS

Philippe Baudrenghien AB/RF 07/07/2005 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 3rd june 2005 Philippe Baudrenghien AB/RF

LECC / Sophie BARON-PH/ESS 07/07/2005 Brief status TTC upgrade principle AB/RF and experiment conditions Implementation proposal Proposed procedure 03/06/2005 LECC / Sophie BARON-PH/ESS

AB/RF & Experiment conditions AB/RF conditions Experiments common conditions TTC BACKBONE All experiments must agree. AB/RF chooses the implementation: Simple point to point analog optical link. Receiver in 6U VME cards housed in a VME crate No compensation of thermal drifts. Receiving modules must be located in a room that is easily accessible to our piquet service. Physically Remotely (via ethernet) Hardware must be paid for by the experiments. 3BC and One Orbit signal minimum Guaranteed period between injection and beam dump Costs to be clarified, payment will be on delivery Spares policy to be clarified Prefer underground (tunnel) cable route to reduce the drift Guaranteed functioning of RD-12 system until the new one is proven to be functional New TTCmi Review Process including Milestone to be put in place for module development, In particular for “new receiver crate” Performance should be no worse than current TTCmi implementation (Jitter, stability with time & temperature) 03/06/2005 LECC / Sophie BARON-PH/ESS

LECC / Sophie BARON-PH/ESS 07/07/2005 Brief status TTC upgrade principle AB/RF and experiment conditions Practical Implementation Proposed procedure 03/06/2005 LECC / Sophie BARON-PH/ESS

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 03/06/2005 LECC / Sophie BARON-PH/ESS

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 03/06/2005 LECC / Sophie BARON-PH/ESS

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 03/06/2005 LECC / Sophie BARON-PH/ESS

Practical implementation responsibilities Equipment/ installation Details Responsible for design, installation, maintenance On-call support RD12 system Fibres star TS/EL Electronics PH/ESS ~~PH/ESS New system AB/RF tx/rx pair AB/RF AB/RF piquet fibres Tunnel/star 6U crate Experiments Crate controller Ex: SBC VP110 Reception module GMT (If used) mezzanine AB/CO Fibres -> SR VH4 copper cable -> Counting rooms 03/06/2005 LECC / Sophie BARON-PH/ESS

Practical implementation WHO PAYS? Price: first estimation per experiment equipment Qty p/unit ALICE ATLAS CMS LHCb TOTAL AB/RF tx/rx 4 7770 31000 124000 6U VME crate 1 5000 20000 SBC RF2TTC Fibres (tunnel) 750 6000 9000 3000 12000 30000 GMT 1000 4000   53000 56000 50000 59000 218000 TUNNEL TOTAL + spares 50% 79500 84000 75000 88500 327000 On call support from the RF no temperature drift one module to be redesigned radiations on point 3 fibres = 750 CHF/ octant UPGRADE WITH AB/RF Tx/Rx On call support from the RF temperature drift one module to be redesigned CMS routing stays in the tunnel fibres = 1000 CHF / section STAR TOTAL + spares 50%   82500 75000 322500 no on call support temperature drift 2 modules to be redesigned no feedback monitoring transmission price shared between experiments 2 transmission crates fibres = 1000 CHF / section  CCC subtotal  2  32000 16000 64000 Exp  subtotal + spares 50%   30375 121500 TOTAL 46375 185500 BASIC UPGRADE 03/06/2005 LECC / Sophie BARON-PH/ESS

LECC / Sophie BARON-PH/ESS 07/07/2005 Brief status TTC upgrade principle AB/RF and experiment conditions Practical Implementation Proposed procedure 03/06/2005 LECC / Sophie BARON-PH/ESS

LECC / Sophie BARON-PH/ESS Procedure Approval in principle Agreement of experiments on the document Agreement of the AB/RF Formal signature (EDMS) 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 03/06/2005 LECC / Sophie BARON-PH/ESS