TTC Information Meeting

1
TTC Information Meeting

• 3rd June 2005

2
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

3
Available Clocks/Orbits TTC upgrade TTC
backbone upgrade TTCmi upgrade
Fibres/attenuators procurement2005
commissioning 2006 Test Beam Production news
AOB
4
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.

5
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.

6
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?
• gt 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

7
Available Clocks/Orbits TTC upgrade TTC
backbone upgrade TTCmi upgrade
Fibres/attenuators procurement2005
commissioning 2006 Test Beam Production news
AOB
8
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

9
TTC backbone upgrade

• Backbone from SR4 to the experiments

10
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?
11
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
12
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 gt 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

13
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

14
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

15
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.

16
Available Clocks/Orbits TTC upgrade TTC
backbone upgrade TTCmi upgrade
Fibres/attenuators procurement2005
commissioning 2006 Test Beam Production news
AOB
17
TTCmi upgrade

• Must follow the backbone upgrade option
• If option2 is chosen gt 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

18
Available Clocks/Orbits TTC upgrade TTC
backbone upgrade TTCmi upgrade
Fibres/attenuators procurement2005
commissioning 2006 Test Beam Production news
AOB
19
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 116 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)

20
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_at_cern.ch)
• with a copy to Luit de Jonge (Luit.Koert.de.Jonge_at_
  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.

21
Available Clocks/Orbits TTC upgrade TTC
backbone upgrade TTCmi upgrade
Fibres/attenuators procurement2005
commissioning 2006 Test Beam requirements
Production news AOB
22
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

23
2005 commissioning

• 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

24
Available Clocks/Orbits TTC upgrade TTC
backbone upgrade TTCmi upgrade
Fibres/attenuators procurement2005
commissioning2006 Test BeamProduction news AOB
25
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.

26
Available Clocks/Orbits TTC upgrade TTC
backbone upgrade TTCmi upgrade
Fibres/attenuators procurement2005
commissioning 2006 Test Beam Production news
AOB
27
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

28
Available Clocks/Orbits TTC upgrade TTC
backbone upgrade TTCmi upgrade
Fibres/attenuators procurement2005
commissioning 2006 Test Beam Production news
AOB
29
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

30
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

Available Clocks/Orbits TTC upgrade TTC
backbone TTCmi Fibres/attenuators
procurement2005 commissioning 2006 Test Beam