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TTC Information Meeting. 3 rd June 2005. Agreement on: Clock sources TTC backbone upgrade principle Discussion on: TTCmi upgrade specifications Information on: Fibres/attenuators procurement 2005 commissioning 2006 Test Beam TTC module production AOB. Invited: P. Baudrenghien

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ttc information meeting

TTC Information Meeting

3rd June 2005

TTC Information Meeting / Sophie BARON-PH/ESS

aims of this meeting
Agreement on:

Clock sources

TTC backbone upgrade principle

Discussion on:

TTCmi upgrade specifications

Information on:

Fibres/attenuators procurement

2005 commissioning

2006 Test Beam

TTC module production

AOB

  • Invited: P. Baudrenghien
  • Invited: P. Baudrenghien,
  • L. De Jonge

Invited: L. De Jonge

Aims of this meeting

TTC Information Meeting / Sophie BARON-PH/ESS

slide3

Available Clocks/OrbitsTTC upgrade TTC backbone upgrade TTCmi upgrade Fibres/attenuators procurement2005 commissioning 2006 Test Beam Production news AOB

TTC Information Meeting / Sophie BARON-PH/ESS

rf signal definition
RF signal definition
  • 2 rings
    • 1 RF system / ring
    • independent
    • During the acceleration ramp, can be driven at different frequencies (p-Pb collisions)
    • the 2 RF are naturally convergent, and are equal to a reference value during physics
    • For observation during the acceleration ramp, the 2 RF are provided to AB/BDI via BST and experiments via TTC.

TTC Information Meeting / Sophie BARON-PH/ESS

rf signal generation
RF signal generation
  • RF tracks the raising magnetic field during the ramp
  • RF = sinusoidal signal with its phase changing continuously
  • RF Spectrum is not perfectly clean (spurious)
    • Might be a problem for the beam lifetime (potential emittance blow-up)
    • Filtering expected from the VCXO, but still a concern
  • To solve this (potential) noise problem
    • use a fixed reference frequency, generated by a pure commercial synthesizer.
    • Once at top energy, before the physics starts, re-synchronizing of the 2 rings with this reference. (like during test beams). More complex.

TTC Information Meeting / Sophie BARON-PH/ESS

at the ttc level
At the TTC level
  • Signal artifacts (reminder):
    • Nothing during access, after beam dump, during shut-down or repair
    • During physics the RF guaranties a clean, stable, non-interrupted BC and Frev
  • Implications for TTC:
    • Is this reference clock needed?

=> if yes, we have to ask the RF to provide it

    • Need for common clock outside the LHC physics? (Cosmics, …)
    • Need to be able to switch from the machine clock to a internal clock outside the guaranteed period

TTC Information Meeting / Sophie BARON-PH/ESS

slide7

Available Clocks/Orbits TTC upgradeTTC backbone upgrade TTCmi upgrade Fibres/attenuators procurement2005 commissioning 2006 Test Beam Production news AOB

TTC Information Meeting / Sophie BARON-PH/ESS

ttc system status
TTC system status
  • The TTC transmission crates (in CCC) are getting old
    • Only 4 crates + 1
    • The number of RF pairs have increased
    • 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
  • We are crucially missing remote monitoring

TTC Information Meeting / Sophie BARON-PH/ESS

ttc backbone upgrade

Bruce’s 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 backbone upgrade
  • Backbone: from SR4 to the experiments

TTC Information Meeting / Sophie BARON-PH/ESS

ttc backbone upgrade options

Optical

splitter

Laser

TDM BM

-2Vreg

VCXO-PLL

To

exp

160.32

Enc o/p

A data i/p

Sync

o/p

B data i/p

160.32

phase

80.16

ref I/P

40.08

mon I/P

1

0

1

0

Laser

O/P I/P

Orbit synchro

LHCrx

ClkGen

4

0

.

0

8

M

H

Z

Cd monitor

I/p O/p

ready

reset

40.08 I/p

orbit

I/P sync

O/P data

LHC

SPS

LHC

orbit

SPS

LHC orbit

SPS orbit

Int

Ext

I/p

40.079 MHz clock

To

Next crates

TTC backbone upgrade options

OPTION 1: redesign the TTC crates in CCC

  • 3 central crates in the CCC + spares (assuming that the reference clock is needed)
  • New hardware, with
    • Signal shaping (RF signals are sinusoidal)
    • monitoring
    • BC switching - PLL
  • Transmission protocol
    • Re-encoding, or
    • 2 separated fibres
  • PRINCIPLE:
  • basically just re-transmit the signals delivered by the RF
  • QUESTION:
  • who will do the 24/24 support?

TTC Information Meeting / Sophie BARON-PH/ESS

ttc backbone upgrade options11
TTC backbone upgrade options

OPTION 2: AB/RF extends the transmission of its signals up to the experiments

  • Could deliver directly to the experiments:
    • RF frequency /10 (40.078xx MHz) - sinusoidal
    • Orbit pulse 5ns
    • Probably on 2 separated fibres
  • RF receivers = VME64 6U modules with a simple monitoring of the optical signal via VME
    • No special hardware needed (VME 6U crate + SBC for monitoring)
    • A priori, 2 rx or 2 tx per RF module (BC and Orbit on separated fibres)
    • 1 rx/tx pair ~ 5000€
  • New TTC module design required (~TTCmi):
    • signal shaping,
    • monitoring,
    • Clock switching
    • PLL
    • Clock & Orbit Fanout
  • INTEREST:
  • Rx/Tx hardware already selected
  • Existing team for the RF support (RF piquet)
  • PRINCIPLE:
  • basically just extend the signals delivered by the RF up to the experiments

TTC Information Meeting / Sophie BARON-PH/ESS

ttc backbone upgrade options12

= 6 fibres + spares

  • SURFACE CABLING
  • Advantages:
  • Radiation free
  • Drawbacks:
  • Temperature variation
  • TUNNEL
  • Advantages:
  • Small temperature variation
  • Drawbacks:
  • Radiations on point 3 - ?
TTC backbone upgrade options
  • If agreement on this option 2:
    • Possible(?) transmission schemes – for information:
    • No optical fibres have been reserved for the TTC even in the previous scheme => should be reserved asap
    • Point 7 forbidden for fibres in the tunnel (very high radiations)
    • Probably 2 separated fibres for BC and Orbit
    • Estimated price for tx/rx per experiment: 3x5000 € = 30.000 €
    • Technical solutions will be chosen & proposed by the AB/RF if this option 2 is required and accepted
      • Should not take into account the drift with temperature – will be solved presumably internally in the experiments if needed

TTC Information Meeting / Sophie BARON-PH/ESS

ttc backbone upgrade options13
TTC backbone upgrade options
  • Conclusion:

Asking the AB/RF group to extend the transmission of the RF signals seems to be logical and safer for the system maintenance

TTC Information Meeting / Sophie BARON-PH/ESS

ttc backbone upgrade options14
TTC backbone upgrade options

And now … ?

  • Many technical discussions already with AB/RF and TS/EL
  • Option2 seems to be technically possible (surface or tunnel)
  • Needs agreement from the experiments
  • If the experiments agree on this:
    • Needs agreement from AB
    • Write an EDMS document in collaboration with the PH and AB departments
      • to agree on the principle of the change of responsibilities
      • Propose/define a way of financing this change
      • Technical solutions will be added later according to the AB/RF and experiment constraints and preferences
    • Begin the specification and design of the new “TTCmi” module

TTC Information Meeting / Sophie BARON-PH/ESS

proposal 40 mhz frev distributed by ab rf
Proposal: 40 MHz/Frev distributed by AB/RF
  • All experiments must agree.
  • We (AB/RF) choose the implementation:
    • Simple point to point analog optical link.
    • Receiver in 160 mm-6U VME cards housed in a VME crate (monitoring of optical power accessible from CCR).
  • No compensation of thermal drifts.
    • 6 ns drift in ½ year for 10 km long link (measured)
    • 100 ps drift in ½ day for 10 km long link (measured)
  • Receiving modules must be located in a room that is easily accessible to our piquet service.
  • Hardware must be paid for by the experiments.

Philippe Baudrenghien AB/RF

slide16

Available Clocks/Orbits TTC upgrade TTC backbone upgradeTTCmi upgrade Fibres/attenuators procurement2005 commissioning 2006 Test Beam Production news AOB

TTC Information Meeting / Sophie BARON-PH/ESS

ttcmi upgrade
TTCmi upgrade
  • Must follow the backbone upgrade option
  • If option2 is chosen => Required:
    • Signal shaping – RF signals = sinusoidal
    • Clock switching
      • Automatic
      • Using the machine timing events (GMT or BOBR)
    • PLL
    • Fanout
    • Monitoring
  • Form factor
    • Presumably VME64x 6U to fit with
      • RF receivers
      • GMT mezzanine + SBC
  • Quantities
    • 3 per experiments + (many) spares

TTC Information Meeting / Sophie BARON-PH/ESS

slide18

Available Clocks/Orbits TTC upgrade TTC backbone upgrade TTCmi upgradeFibres/attenuators procurement2005 commissioning 2006 Test Beam Production news AOB

TTC Information Meeting / Sophie BARON-PH/ESS

fibres attenuators procurement
Fibres/attenuators procurement
  • For single mode patch-cords (9/125um, ST/PC), the standard available lengths/approx prices are:
    • Simplex 1m 15 Sfr., 2m 16 Sfr., 5m 17 Sfr., 10m 20 Sfr.
    • Duplex 1m 30 Sfr., 2m 32 Sfr., 5m 34 Sfr., 10m 40 Sfr.
  • For single mode attenuators, the standard attenuation levels are:
    • 3dB, 5dB (for connection between TTCex and TTCrq with a 1:16 splitter)
    • 10dB
    • 15dB (for connection between TTCex and TTCrq without a splitter)
  • For caps, the 2 types are:
    • female (transmitter/coupler/receiver side)
    • male (fibre side)

TTC Information Meeting / Sophie BARON-PH/ESS

fibres attenuators procurement20
Fibres/attenuators procurement
  • provided by the TS/EL group – not by the Stores because of administrative complications
  • Some patch-cords, attenuators and caps as describe above will be stored in TS/EL for urgent request,
  • the normal delay you can expect for delivery will be 15 days.
  • To place an order, send
    • a budget code
    • the description of what you need to:
      • Oystein Olsen (Oystein.Olsen@cern.ch)
      • with a copy to Luit de Jonge (Luit.Koert.de.Jonge@cern.ch).
  • If you have some special request (special fibre, connector type, attenuators, etc...), you can as well contact Oystein Olsen or Luit De Jonge.

TTC Information Meeting / Sophie BARON-PH/ESS

slide21

Available Clocks/Orbits TTC upgrade TTC backbone upgrade TTCmi upgradeFibres/attenuators procurement2005 commissioning 2006 Test Beam requirements Production news AOB

TTC Information Meeting / Sophie BARON-PH/ESS

2005 commissioning
2005 – commissioning
  • Fibres and signal potentially available
    • Possible to receive a clock from a central TTC transmitter crate installed in AB/CO lab
    • Fibres installed from AB/CO to CCC and from CCC to SR
    • Just ask if you need to receive the signal
      • Patch at the CCC
      • Turn on the crate and verify the quality of the transmission

TTC Information Meeting / Sophie BARON-PH/ESS

2005 commissioning23
Material – probably available at the Pool this summer

OTDR – negotiations with LUCIOL in course

Used for length measurement (2-3 cm precision)

Or as a classical OTDR (connection quality, error location..)

A priori, 2 would be purchased

VFL – Visual Fault Locator

Optical Power Meters

2005 – commissioning

TTC Information Meeting / Sophie BARON-PH/ESS

slide24

Available Clocks/Orbits TTC upgrade TTC backbone upgrade TTCmi upgradeFibres/attenuators procurement2005 commissioning2006 Test BeamProduction news AOB

TTC Information Meeting / Sophie BARON-PH/ESS

2006 test beam
2006 Test Beam
  • ATLAS, CMS and LHCb requested a 25ns beam during next year test beam
  • ALICE?
  • Please send me the needs you may have in term of TTC installation, so as we can either use the new scheme or the current one.

TTC Information Meeting / Sophie BARON-PH/ESS

slide26

Available Clocks/Orbits TTC upgrade TTC backbone upgrade TTCmi upgradeFibres/attenuators procurement2005 commissioning2006 Test Beam Production newsAOB

TTC Information Meeting / Sophie BARON-PH/ESS

production news
Production news
  • TTCrq – V5:
    • 1st batch delivered in March – 200 boards
    • 2nd batch: 2200
      • PCB in production
      • New tester board
      • Delivery ~ August
  • TTCex/tx
    • PCB produced
    • Assembly now
      • Store delays (…) – components for 60 modules
      • 20 tx and 30 ex presently being assembled
      • The rest as soon as the components arrive
  • TTCvi
    • 10 already produced but still at EFACEC – needed?
    • The rest mid-june
  • TTCoc
    • DAI still in the purchasing office
    • But should leave CERN soon
      • TTCoc16: 2-3 weeks delivery delays
      • TTCoc32: 6-8 weeks delivery delays

TTC Information Meeting / Sophie BARON-PH/ESS

slide28

Available Clocks/Orbits TTC upgrade TTC backbone upgrade TTCmi upgradeFibres/attenuators procurement2005 commissioning2006 Test Beam Production news AOB

TTC Information Meeting / Sophie BARON-PH/ESS

slide29
AOB
  • TTC Clock Gen
    • Prototypes being assembled now
      • Manual switch for internal/external clock
      • 40.078MHz
      • 6 ECL outputs
      • 1 TTL
      • 2LVDS
  • TTCrq back from radiation
    • Regulators were monitored during radiation tests in December (F. Anghinolfi) - OK
    • LVDS drivers to be tested next week
  • GBT13 for SLHC– discussions are beginning

TTC Information Meeting / Sophie BARON-PH/ESS

required to move forward
Do the experiments…

need the Reference Clock?

need a common 40MHz clock outside the physics?

agree on the principle of asking the AB/RF group to extend the signal transmission?

need to standardize more components?

need something special for the commissioning?

need something special for the 25ns beam next year

Required to move forward

Available Clocks/Orbits TTC upgrade TTC backbone TTCmi Fibres/attenuators procurement2005 commissioning2006 Test Beam

TTC Information Meeting / Sophie BARON-PH/ESS