LHC Commissioning Working Group - LHCCWG
Open Actions for Recycling
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Topic |
Action |
Date |
Status |
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Integrity of machine settings (save snapshot of settings/back up) |
Coordinators |
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Define cycle and recovery procedures for all types of LHC magnets |
FiDeL Team |
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Feedback of beam-based corrections to Fidel/WISE |
L. Bottura, |
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Prediction of the momentum reproducibility from fill to fill (radial movements, interplay between chromaticity measurements & momentum cleaning) |
R. Assmann, L.
Bottura, M. Giovannozzi |
in progress |
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Include hysteresis model in FiDeL field predictions |
L. Bottura, M.
Strzelczyk et al? |
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Review and finalize precycles when extended measurement results are available |
R. Wolf et al |
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Precycles for Q5/Q6 and for b5 spool pieces |
R. Wolf et al |
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Volunteers for extended measurement campaign |
All |
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Follow-up on software infrastructure for extended magnet measurements |
J.-P. Koutchouk |
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Open Actions for Aperture Meeting
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Topic |
Action |
Date |
Status |
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Specifications for as-built database. Recruitment of help. |
P. Collier and O. Bruning? |
in progress |
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Set up aperture database |
S. Redaelli |
in progress |
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Follow-up on aperture scans at each fill |
S. Redaelli, R.
Steinhagen |
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Appoint
aperture czar |
R. Bailey, M.
Giovannozzi, R. Assmann? LTC? |
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Report on
aperture issues to LTC |
R. Bailey |
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Open Actions for Filling-Schemes Meeting
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Topic |
Action |
Date |
Status |
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Follow up on early filling schemes |
M. Ferro-Luzzi, W. Herr |
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Sequential filling or alternating filling of the two rings |
V. Kain, S. Fartoukh et al |
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Identify most robust filling scheme for first years of operation |
P. Collier + All? |
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Open Actions for Parameters+Tolerances
Meeting
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Topic |
Action |
Date |
Status |
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Establish prioritized list of measurements and beam parameters for 2007 and for 2008 |
R. Bailey + All? |
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Define or agree on specific target parameters for each commissioning stage |
R. Bailey + All? |
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Open Actions for (BI) Readiness Meeting
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Topic |
Action |
Date |
Status |
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Provide BI commissioning plans and include them in web procedures |
J.-J. Gras, V. Kain, M. Gruwe et al |
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Set up milestones for instrument commissioning |
M. Lamont, R. Bailey, J.-J. Gras + All? |
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Establish, prioritize and check procedures, application software and documentation for each measurement |
M. Lamont, R. Bailey, J.-J. Gras + All? |
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Schedule LHCCWG discussion or dedicated meeting on LSA interface for each instrument |
R. Bailey, J.-J. Gras |
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Follow-up on temperature variation of BPM readings |
R. Jones, R. Steinhagen |
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Effect of satellite bunches on BPM readings and related tolerances |
R. Jones, G. Arduini |
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Other Open Actions
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Topic |
Action |
Date |
Status |
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Injection |
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Present updated estimate of emittance growth from kicker ripple issue to the LTC |
B. Goddard |
already foreseen for early 2008 |
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Machine-detector interface: |
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Can VELO be closed with LHCb experimental field at full strength? |
Y. Papaphilippou , M. Ferro-Luzzi |
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Simulation of 450-GeV background conditions |
V. Talanov |
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Absolute calibration of BCTs |
R. Jones? |
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Produce a realistic estimate of the vacuum conditions expected for the 450 GeV run. |
AT/VAC |
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Follow up pp simulations at 7 TeV and 450 GeV with Nikolai Mokhov and/or Mika Huthinen. |
E. Bravin or H. Burkhardt |
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Sensitivity of luminosity signal (e.g., to orbit angle & pressure) |
H. Burkhardt, R. Assmann, J.-P. Koutchouk? |
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Loss distribution of collision debris |
=> LCWG |
referred to LCWG |
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Roman pot operation during commissioning (email D. Macina) |
not yet assigned |
05.04.2006, 12.04.2006 |
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Further discuss data exchange with experiments |
T. Wijnands, H. Burkhardt |
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Follow-up on background signals |
H. Burkhardt, M. Ferro-Luzzi |
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Circulate convention memo to experiments |
P.
Baudrenghien, M. Ferro-Luzzi |
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Collisions: |
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Check resolution of beam-beam coupling? |
J.-P. Koutchouk or volunteer |
not urgent |
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Hysteresis of orbit correctors used in separation scans at 450 GeV? |
W. Venturini Delsolaro |
to be discussed |
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Collision detection with IR beam loss monitors |
R. Schmidt or B. Dehning? |
to be discussed |
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Specify conditions for useful signals from luminosity monitors |
H. Burkhardt |
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Follow up ad-hoc signal from experiments for collision optimization |
A. MacPherson, R. Alemany, M. Lamont, J.-J. Gras |
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Energy matching and energy stability |
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Energy tracking between sectors |
R. Bailey, F. Bordry, J. Wenninger |
presentation by Freddy Bordry in fall 2006 |
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Beam lifetime |
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Develop response to poor beam lifetime |
J.-P. Koutchouk? |
to be discussed |
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Orbit feedback: |
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Feedback behavior during squeeze |
R. Steinhagen.
J. Wenninger, M. Giovannozzi |
considered |
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Machine protection: |
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Check time constants and margins of warm compensator magnets |
Y. Papaphilippou |
to be discussed |
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Machine protection during aperture measurements for web procedure |
R. Schmidt |
to be discussed |
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Numerous open questions on MPS commissioning |
? |
? |
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Possibility of single-beam dump |
B. Goddard et al |
to be further discussed |
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Follow up MP issues of ac dipole and aperture kicker |
J. Uythoven |
treated in MPSWG |
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Clarify strategy for setting of collimators and protection devices during commissioning and determine the associated relaxed tolerances |
J. Uythoven,
Goddard, R. Assmann, M. Giovannozzi, J. Wenninger, V. Kain, et al |
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treated in MPSWG |
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Diagnostics |
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Follow up re-cabling of IR BPMs for bringing the beams into collision |
R. Jones |
to be discussed |
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AC Dipole for aperture measurements |
S. Fartoukh? |
to be discussed |
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Clarify actual BPM performance |
R. Jones |
in progress |
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Agree on kicker amplitudes which are safe and/or useful |
J. Uythoven?,
F. Schmidt?, S. Fartoukh |
to be discussed |
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Follow-up of two-beam IR button BPMs at the LTC |
O. Bruning |
to be discussed |
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Study interference of ac dipole with orbit feedback and collimation |
O. Bruning |
to be discussed |
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Define the necessary BLM beam tests |
H. Burkhardt, L. Ponce |
to be discussed |
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Interface of RadMon to other systems |
T. Wijnands, R. Schmidt |
to be discussed |
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Follow up of K modulation |
M. Lamont, R. Tomas |
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Follow up timing signals at injection |
P. Baudrenghien |
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BPM sum signal mode ready for start up? Average orbit available in threading mode? Intensity limit on BGI from quenches? Check residual effect of BGI magnetic field with experts. Performance specifications for BCTDC. Check if BCTF resolution is sufficient to do the lifetime calculation for collimation in real time. Hardware signal triggering beam dump below Q4 quench limit? Tickler for tune and chromaticity measurements in nominal operation? |
J.-J. Gras |
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Detailed list of what needs to be done for the commissioning of each instrument. Justification of dedicated beam time in view of tight schedule; specify number of MDs and details of commissioning steps. |
J.-J. Gras |
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Send specification of beam-lifetime signal for collimation
to |
R. Assmann |
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Prepare beam tests with new enlarged BPMWI |
J.-J. Gras, J. Uythoven |
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Clarify status of wall-current monitor |
J.-J. Gras, RF Group |
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Timing: |
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Discussion on pre-pulse (need & requirements) |
B. Goddard |
in progress, still questions |
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Follow up identification of wrong bucket injection |
H. Burkhardt |
to be discussed |
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Definition of bunch 1 |
P. Baudrenghien |
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Optics: |
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Transfer data from magnet evaluation activity to machine operation database |
J.-P. Koutchouk, M. Lamont or M. Giovannozzi |
to be discussed |
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Beam-based measurement & correction of transfer function for separation dipoles using orbit feedback, in particular if D2 is known |
? |
to be discussed |
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Study expected effect of triplet-quad roll error and related measurement procedures |
? |
to be discussed |
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Clarify whether the non-reproducibility is the same or different for the two apertures |
? |
to be discussed |
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Clarify dispersion correction |
R. Tomas |
in progress |
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Global view of expected imperfections (beta beating etc.) |
J.-P. Koutchouk,
M. Giovannozzi |
in progress; partly or fully addressed by R. Tomas in LHCCWG#8 |
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Simulation of beam signals & tune resolution |
F. Zimmermann |
initial simulation done with HEADTAIL in LHCCWG#3 |
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Injection septa reproducibility |
J. Wenninger? |
partly done LHCCWG#17 |
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Effect of tracking errors in warm magnets |
R. Assmann |
in progress |
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Add the measured cold bore profile and cross-check the misalignment part in the WISE LHC model |
WISE Team |
to be discussed |
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Finalize procedure for beta function measurements at 7 TeV |
R. Tomas, J.-P.
Koutchouk, F. Zimmermann |
to be discussed |
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Standardized interface for measurements and on-line model simulations |
F. Schmidt |
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Communicate AT/MEB results on magnet geometries and
voluntary misalignments to BI |
L. Bottura |
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Refined estimates of static and dynamic beta beating with
all contributions |
LCU,
Collimation Team |
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Collimation: |
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Reproduce Fig.12 of Ralph’s Chamonix XII report showing inefficiency vs. closed-orbit change for 8% beta-beat at the worst phase |
S. Redaelli, R. Assmann? |
referred to LCWG |
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Loss maps for 450 GeV commissioning & calibration run |
S. Redaelli, R. Assmann? |
referred to LCWG |
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Estimate collimation inefficiency and loss rate in commissioning |
S. Redaelli? |
referred to LCWG |
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Initial setting & set up during squeeze |
R. Assmann, ? |
initial setting LHCCWG#5, squeeze set up in presentation fall 2006 |
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Check n1 for squeezed optics |
R. Assmann, T. Weiler |
referred to LCWG |
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Accelerator Systems |
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Follow-up open questions on vacuum system |
F. Zimmermann |
Planned |
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Discussion on LHCCWG interaction with CPP and MPP |
R. Bailey? |
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Report on vacuum commissioning plan |
AT-VAC |
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Ramp and squeeze: |
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Provide recent squeeze data to operation and prepare for including them into future power test |
? |
to be discussed with Mike |
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Decide where to handle decay effects: Fidel or LSA? |
? |
to be discussed with Mike |
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Prepare to later use all data available from AT (per magnet) |
? |
to be discussed with Mike |
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Specify in detail incorporation of trims before ramping. Ensure and test compatibility with feedbacks and make sure that machine safety cannot be compromised |
? |
to be discussed with Mike |
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Make sure that there will be no problem with the 0.01 A check, for example for correctors with low currents |
? |
to be discussed with Mike |
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Specify the number of stops required for the set-up of the beam dump, before we can ramp to 7 TeV |
? |
to be discussed with Mike |
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Present detailed procedure for steps in commissioning the energy ramp |
? |
to be discussed with Mike |
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Clarify number of pickups available for the radial loop during commissioning |
? |
to be discussed with Mike |
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Allocate tolerance budgets for static and dynamic errors |
? |
to be discussed with Mike |
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Provide collimator settings during the ramp |
? |
to be discussed with Mike |
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Clarify the strategy for incorporation of trims before the ramp and evaluate consequences |
? |
to be discussed with Mike |
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Test real-time channel for trims before commissioning |
? |
to be discussed with Mike |
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Include magnet current limits and check current ramp rates |
M. Lamont |
in progress |
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Finalize squeeze/un-squeeze optics for IR2 and IR8 |
M. Giovannozzi |
referred to LOC |
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Study of combined ramp and squeeze in regard to magnet properties |
W.
Venturini-D., J.-P. Koutchouk, M. Giovannozzi |
in progress |
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Follow up sextupole behavior during the squeeze, and the problem of low settings for MQT and MQTL. Take additional data as needed to fully characterize the MQM and MQY decay characteristics |
W.
Venturini-Delsolaro et al |
to be discussed |
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Decide between the options of single-beam and two-beam squeeze commissioning, and choose an IP squeeze sequence. Clarify whether in commissioning phase A.8 the machine protection is fully operational at the start and at the end of the ramp |
S. Redaelli, EICs, and V. Kain? |
to be discussed |
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Survey attempts of, and experience with, beta* tuning at other colliders |
J.-P. Koutchouk |
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Documentation/Web Follow Up: |
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Example procedure |
EICs & V. Kain |
in progress |
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Send comments on procedures to Magali, Verena and friends |
All |
to be discussed |
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General: |
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Follow up of LTC open actions |
All |
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Completed Actions |
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Discussion on commissioning optics model |
M. Giovannozzi |
Completed,
private communication M. Giovannozzi 04.12.2006 |
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Confirm ramping time of experimental magnets and possibility of slow down |
M. Ferro-Luzzi |
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LHCf statement (machine-detector interface) |
H. Burkhardt |
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75-ns spacing - report to LTC (commissioning beam parameters) |
R. Bailey |
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Difference in ring circumference; need for decoupled rf systems? |
G. Arduini, J.-P. Koutchouk |
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Review of orbit feedback functioning & calibration (orbot feedback) |
R. Steinhagen, J. Wenninger |
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Scenario for bringing beams into collision |
H. Burkhardt |
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Effect of SSS tracking errors on chromaticity |
S. Fartoukh |
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Possible non-closure of nc/sc separation dipoles during ramp |
S. Fartoukh |
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