1. 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

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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

8. 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

9. 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

10. 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

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

14. 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

15. 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

16. 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

17. 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