LHC Beam Instrumentation Readiness

1
LHC Beam Instrumentation Readiness

• Overall State (Organization - Production
  Installation HWC SW)
• Details per Observables (Position Losses
  Intensity Transverse Profiles Q Q
  Luminosity)
• Conclusions

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The new Baseline
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Overall State Organisation Phase I List

• The Phase I LHC Beam Instrumentation consists of
• Beam Position 1000 BPM (15 types)
• Beam Losses 4000 BLM (IC and SEM)
• Beam Intensity 4 BCTDC, 4 BCTFR (fast ring), 4
  BCTFD (fast dump), 2 BSRA (abort gap), 1000 BPM
• Beam Transverse Profile 2 BSRT (sync rad
  telesc.), 2 BWS (wire scanners), 4 BGI
  (Ionisation gas monitors)
• Tune and Chromaticity 14 BPL, 4 BQK (tune
  kickers), 4 BQS (Schottky)
• Luminosity 8 BRA (2 types)

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Overall State Organisation BI Responsible
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Overall State Organisation Commissioners
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Overall State Monitor Production/Installation

• Sofar, we managed to produce and install our
  monitors on time with respect to the general
  machine schedule. Look this for today details.
• It should also be the case for the remaining.
• But the 2 BGIs (HV on Beam 2) installed in LSSR4
  have been burned during bake out. We may be able
  to rebuild one detector for the start-up. Please
  select the plane!

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Overall State Monitor Installation and INB

• During installation, we identify via labels with
  code bars
• The functional slots
• The piece of equipments
• We update the layout database through the HWC
  travelers
• We will thus be Ok for INB issues

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Overall State HW Commissioning

• All our instrument HWC procedure have been
  recorded and linked to the corresponding
  travelers accessible from
• The LHC layout entry page
• The LHC HWC links

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Overall State HW Commissioning
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Overall State HW Commissioning
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Overall State HW Commissioning
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Overall State HW Commissioning
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Overall State SW specifications

• Based on the LHC BI functional specifications, we
  are currently discussing/agreeing on the
  corresponding operational software interfaces of
  our front end server
• We agree with
• the instrument commissioners
• the operational application developers
• The LHCCWG scenario builders

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Overall State SW specifications

• The following operational interfaces have been
  agreed
• Beam Position
• Beam Loss
• Beam Profiles (BWS, BSRT slow and fast, BGI)
• Work is in progress on Intensity and Q/Q
• The discussed interfaces are documented in
  AB/BI/SW web pages

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Overall State SW specifications
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Overall State SW specifications
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Overall State SW Prototyping

• Based on these specifications, AB/BI/SW will
• deploy servers on BI LHC FECs emulating these
  interfaces (requested for November by Mike)
• We already have some BPM and BLM FEC running.
• Well have BWS and BSRT beginning of July.
• The rest will follow during the Summer.
• Transmit corresponding timing and logging
  requirements to AB/CO

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Overall State Commissioning with Beam

• Except for BLM followed by the MPWG, the
  procedures for the beam instrument commissioning
  with beam will be defined by BI for the different
  instruments.
• This work will start this Summer and could be
  presented this Autumn.

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Details Per Instrument
...
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Details per Observable Position Status

• Monitors, electronics and front end software will
  be ready for the start-up
• Well basically have 5 types of acquisitions
• Threading For the first injections before RF
  capture commissioning Asynchronous Ok for a
  few turns.
• And once beam is captured and our fine delays
  tuned
• Orbit latest orbit acquisition published at 1 Hz
  (note orbit is acquired faster for RT)
• Capture On request, acquires the beam position
  for selected bunches over a selected number of
  consecutive turns (see details on BI Web)
• XPOC the position for the last turns prior to
  every beam-dump event will be available for XPOC
• Post Mortem Buffers will be sent on PM events via
  the CO PM channel.

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Details per Observable Position Remaining Issues

• Front End SW
• Calibration settings handling (first day and
  following maintenance tbd with AB/CO/DM)
• Trigger sensitivity swapping necessary but slow
  process (hundreds of ms) between pilot and
  nominal intensity (LSA is informed).
• Impact of capture data request on RT data
  transmission (currently investigated with CO)
• Development of the XPOC position interlock system
  in point 6 (to be defined with Brennan)

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Details per Observable Position Remaining Issues

• HW
• HW commissioning (ongoing)
• Fine delays tuning (as soon as beam is captured).
• Operational Applications
• Full scale test (64 crates) for concentrators
  (LSA and RT), logging
• RT Feed-back BI-OP proposal start with a loop at
  1Hz then try to increase speed to nominal 10 Hz
  (or ultimate 25Hz) work in progress.
• RT loop control
• Fixed displays definition and ad-hoc developments
  (if necessary)

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Details per Observable Losses Status

• Monitors, electronics and front end software will
  be ready for the start-up
• Well basically have 4 (1) acquisition modes
• Max Losses The highest loss observed at the
  monitor since the last request (at 1Hz) over 12
  different time periods (40uS, 80 uS, 320 uS, 640
  uS, 2.54 mS, 10.24 mS, 81.92 mS, 655.36 mS, 1.31
  S, 5.24 S, 20.97 S, 83.88 S)
• Study Data triggered as and when required, the
  granularity of this data will be per channel 1
  data point every 40 microseconds covering the
  last 1.3 secs.
• XPOC Data Triggered every beam dump, will return
  for each channel 1 data point every 40
  microseconds covering the last 100ms before the
  dump and the following 40ms.
• Post Mortem Buffers will be sent on PM events via
  the CO PM channel.
• Collimation Data feed loss data into the
  collimation control system to ensure that losses
  dont exceed set limits during motion. This data
  will be sent through a dedicated UDP layer and be
  triggered by the collimation system.

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Details per Observable Losses Remaining Issues

• Front End SW
• Threshold handling (DB, Tools, procedures under
  discussion)
• Impact of MD data request on RT data transmission
  (logging under investigation with CO)
• HW
• Threshold evaluation (work in progress in BI)
• Commissioning with Beam (procedures, options
  work in progress in MPWG)
• Operational Applications
• Full scale tests
• Fixed displays definition and ad-hoc developments
  (if necessary)

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Details per Observable Trans. Prof. BWS Status

• Monitors, electronics and front end software will
  be ready for the start-up
• It will be possible to scan the to beams at the
  same time but not the two planes on the same beam
• 2 wires per plane per beam will be installed, 1
  operational 1 hot spare.

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Details per Observable Trans. Prof. BWS
Remaining Issues

• Intensity Limitation
• Quench Limit on Beam Intensity (see details).
  Current estimation is up to 1-6 1012 protons in
  the circulating beam, ie. about 0.3-2 of the
  nominal intensity at 7 TeV
• Wire Damage Limit on Intensity difficult to
  predict (new study in progress) but seems close
  to the Quench limit.
• BWS are calibration devices
• They should be used asap to cross-calibrate the
  BSRT and BGI.

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Details per Observable Trans. Prof. Ionisation
Gaz Mon. Status

• Beam 1 monitors, electronics and front end
  software will be ready for the start-up
• Possibly one plan on Beam 2 (make your choice)
• Well basically have 1 continuous acquisition
  mode Acquisition of one image per plane obtained
  from the integration over 20ms of the rest gas
  ionization signal. The measurement provides beam
  profile, size and position at 1Hz. The signal
  quality will depend on the external systems, i.e.
  gas injection and B-field.

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Details per Observable Trans. Prof. Ionisation
Gaz Mon. Remaining Issues

• Front End SW
• Gas Injection Control (tbd with AT/VAC in
  September)
• B-field control and correction (under study
  encouraging feed-back from Jorg)
• Operational Applications
• Integration and commissioning of Gas injection
  and B-Field control
• Operational application to be started

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Details per Observable Trans. Prof. Synchroton
Light Status

• Monitors, electronics and front end software will
  be ready for the start-up
• Well basically have 3 acquisition modes
• Non Gated Full beam image (profile and sigmas)
  integrated over 20 ms published at 1Hz
• Gated
• Physics mode All bunches integrated over 1 turn
  published as fast as possible (every minutes for
  the 3564 buckets)
• MD mode gated part of the beam (down to one
  single bunch) over several (up to 3000)
  consecutive turns

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Details per Observable Trans. Prof. Synchroton
Light Remaining Issues

• Front End SW
• Ethernet link towards the fast camera (in
  progress)
• Automatic gain setting implementation
  commissioning
• HW
• Commissioning with beam of the light sources
  (Onduleur and D3)
• Calibration Beam with different energy and
  intensity conditions (as soon as possible!)
• Reliability of the fast camera in tunnel
  conditions

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Details per Observable Intensity BCTDC Status

• Monitors, electronics and front end software will
  be ready for the start-up
• Well have 2 DC monitors per beam. One
  operational, the second as spare (not hot) in
  case of problems and specialist monitoring.
• Well basically have 3 (1) acquisitions
• Injection beam current for each beam, before and
  after an injection. Acquired and published every
  injection.
• Standart beam current for each beam acquired
  and published continuously at 1 Hz.
• Safe Beam Flag measured intensity will be
  transmitted at 10Hz through a dedicated HW link
  to the MP system.
• Post Mortem Buffers will be sent on PM events via
  the CO PM channel.

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Details per Observable Intensity. BCTDC
Remaining Issues

• HW
• Commissioning of the Intensity transmission HW
  link
• Cross-Calibration (Injection lines, fast ring
  BCT)
• No automatic arbitration between the 2 redundant
  monitors for the start-up
• Operational Applications
• Operational application to be started

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Details per Observable Intensity BCTF Status

• Monitors, electronics and front end software will
  be ready for the start-up
• Well have 2 fast monitors per beam in the ring
  and 2 in the dump lines. One operational, the
  second as spare (not hot) in case of problems
  and specialist monitoring.
• Well basically have 2 (1) acquisitions
• Capture provides intensities of selected
  individual bunches (S) over N consecutive turns.
  (S N lt 512K) The data-taking is started at
  reception of a dedicated central timing.
• Standart All individual bunch currents are
  averaged over 227 turns (20ms). This measurement
  is continuously repeated at 10Hz and published at
  1Hz. Bunch and Beam lifetime will also be
  computed and transmitted.
• Post Mortem Buffers will be sent on PM events via
  the CO PM channel.

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Details per Observable Intensity. BCTF
Remaining Issues

• HW
• Calibration with Beam
• No automatic arbitration between the 2 redundant
  monitors for the start-up
• Development and Commissioning of the dI/dt
  monitoring to be done BI agreed on the
  objective to have a prototype ready for Summer
  2008.
• Operational Applications
• Operational application to be started
• Fixed displays definition and ad-hoc developments
  (if necessary)

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Details per Observable Intensity BSRA abort
gap Status

• Monitors, electronics and front end software will
  be ready for the start-up
• Well basically have 1 acquisition
• Standart The intensity values will be acquired
  at 10 Hz. 30 intensity values will cover the
  abort gap period. The DAB card will cumulate
  these intensities over a pre-defined number of
  turns (ex 1000). The acquisition result will
  thus be an array of 30 average intensities, which
  sum will represent the intensity in the gap
• Post Mortem Buffers will be sent on PM events via
  the CO PM channel.

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Details per Observable Intensity. BSRA abort
gap Remaining Issues

• HW
• Calibration with Beam
• This is just a monitoring. No action will be
  triggered from the Front End computer itself.
• Operational Application
• Operational application to be started

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Details per Observable Intensity via BPM Status

• Monitors, electronics and front end software will
  be ready for the start-up
• Well use the acquisition channel of beam 2 to
  read intensity of beam 1 (and vice versa), i.e.
  we lose beam position on the other beam

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Details per Observable Intensity. Via BPM
Remaining Issues

• HW
• Commissioning with beam if and when necessary
  (i.e. unexplained obstruction somewhere in the
  machine).
• Operational applications
• This will remain an expert intervention. No
  operational application is foreseen for this.

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Details per Observable Q Q via BBQ Status

• Monitors, electronics and front end software will
  be ready for the start-up
• Well basically start with single kick method and
  1 acquisition
• we will return the raw data, the FFT and basic
  peak detection for each measurement
• these acquisitions will be triggered by a central
  timing event also triggering the selected kicker
  (tune kicker or damper).
• PLL continuous measurement and RT monitoring will
  come later (will require a few MDs)

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Details per Observable Q Q. Via BBQ
Remaining Issues

• HW
• Kicker selection (Tune Kicker or Damper) and
  triggering?. (under discussion in ABCIS)
• PLL commissioning (HW and FE SW will be ready but
  will need MD time)
• Feed back loop and commissioning (will be based
  on BPM orbit feed-back infrastructure)
• Operational Application
• Operational application to be started

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Details per Observable Q Q via Head Tail
Status

• Monitors, scope and front end software will be
  ready for the start-up
• Well start with a scope and basic FESA class
  transmitting the raw data like in the SPS.
• We plan to use the exiting expert application to
  assess this system
• No operational application is foreseen for the
  start-up.

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Details per Observable Q Q via Schottky
monitors Status

• Monitors marked for phase II but ready and
  installed. Well use the same electronics and
  front end software than for the BBQ system
• This is not a priority. The corresponding
  operational application will be developed if time
  allows.

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Details per Observable Luminosity BRANA
BRANB Status

• Monitors will be ready for the start-up.
• 4 BRANA (left and right IP 1 and 5) developed by
  Berkeley
• 4 BRANB (left and right IP 2 and 8) developed by
  AB/BI
• AB/BI electronics and front end software will be
  ready for the start-up. So should be Berkely.
• Well basically have 2 acquisitions per IP
• Total relative luminosity at 1 Hz this quantity
  is proportional in an unknown but constant way to
  the actual luminosity the proportionality
  constant may differ from IP to IP.
• Bunch by bunch relative luminosity at 0.1 Hz

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Details per Observable Luminosity BRANA
BRANB Remaining Issues

• HW
• Commissioning with Beam
• Signal level and quality.
• Operational Application
• Operational application to be started

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Conclusions
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A word on a hypothetic sector test

• The new enlarged BPM (BPMWI) will be available
  soon.
• We still have to
• HW commission the LSS8 BTV
• Get missing Ethernet connections in UJ76
• We would install an ad-hoc system (not the final
  one) to measure intensity from the BPM close to
  the end.
• So we could be ready if necessary.

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Conclusions

• Except for the BGI on beam 2 (destroyed during
  bad bake-out), our instruments will be available
  on time.
• The targeted performances (in terms of accuracy
  and resolution) of these instruments are the one
  described in the LHC beam instrumentation
  functional specifications.
• But we will need a lot of MD time with stable
  beam conditions to commission our instruments and
  reach this performance.
• We will discuss and document these commissioning
  procedures during the coming months and come back
  to you to fit the result in the 2 months for
  commissioning to 7TeV ?