Strategy for longterm support of the TTC system

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Strategy for long-term support of the TTC system

• 7th July 2005

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Brief status TTC upgrade principle AB/RF and
experiment conditions Implementation
proposalProposed procedure
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TTC status

• Backbone from SR4 to the experiments

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TTC system status

• The TTC transmission crates (in CCC) are obsolete
• Only 4 crates
• 3 BC and Orbit to be transmitted
• gt 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
• gt NO SPARE
• We are crucially missing remote monitoring

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Brief status TTC upgrade principle AB/RF and
experiment conditions Implementation
proposalProposed procedure
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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
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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
• gt performances must be equal or better than
  current TTCmi crate

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Brief status TTC upgrade principle AB/RF and
experiment conditions Implementation
proposalProposed procedure
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AB/RF Experiment conditions
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Brief status TTC upgrade principle AB/RF and
experiment conditions Practical
ImplementationProposed procedure
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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 gt 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

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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
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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 Bruces 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

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Practical implementation

• responsibilities

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Practical implementation
WHO PAYS?

• Price first estimation per experiment

UPGRADE WITH AB/RF Tx/Rx
BASIC UPGRADE
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Brief status TTC upgrade principle AB/RF and
experiment conditions Practical
ImplementationProposed procedure
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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