FQWG, 24-MAR - 2006 1 R. Wolf, AT-MEL- MC Experience making transfer Experience making transfer functions for LEP functions for LEP R. Wolf, AT-MEL-MC R. Wolf, AT-MEL-MC Introduction Introduction Magnet & Control data base tables Magnet & Control data base tables Making of the Transfer function Making of the Transfer function Work to be done for LHC (looking back Work to be done for LHC (looking back to LEP) to LEP) Conclusion Conclusion
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Experience making transfer functions for LEP R. Wolf, AT-MEL-MC
Introduction Magnet & Control data base tables Making of the Transfer function Work to be done for LHC (looking back to LEP) Conclusion. Experience making transfer functions for LEP R. Wolf, AT-MEL-MC. Introduction. LEP Technically simpler, no time dependence, warm - PowerPoint PPT Presentation
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FQWG, 24-MAR -2006 1 R. Wolf, AT-MEL-MC
Experience making transfer functions Experience making transfer functions for LEPfor LEP
R. Wolf, AT-MEL-MCR. Wolf, AT-MEL-MC
IntroductionIntroduction Magnet & Control data base tablesMagnet & Control data base tables Making of the Transfer functionMaking of the Transfer function Work to be done for LHC (looking back to LEP)Work to be done for LHC (looking back to LEP) ConclusionConclusion
FQWG, 24-MAR -2006 2 R. Wolf, AT-MEL-MC
IntroductionIntroduction LEP Technically simpler, no time dependence, warm LEP Technically simpler, no time dependence, warm
However several LEP specific corrections to apply to the transfer functions.
Administratively simpler. On the AT side only one group Administratively simpler. On the AT side only one group involved. Now there are 3 (MAS, MTM, MEL).involved. Now there are 3 (MAS, MTM, MEL).
All magnets measured magnetically (at room All magnets measured magnetically (at room temperature) + 8 superconducting low-beta quadrupoles temperature) + 8 superconducting low-beta quadrupoles measured at 4.2K.measured at 4.2K.
Validated transfer function measurements of each LEP magnet, including correctors, stored in Oracle database tables of the magnet database.
Only transfer functions of circuits present in the control Only transfer functions of circuits present in the control system database.system database.
FQWG, 24-MAR -2006 3 R. Wolf, AT-MEL-MC
Magnet & Control data base tablesMagnet & Control data base tables
FQWG, 24-MAR -2006 4 R. Wolf, AT-MEL-MC
(Intermediate) Magnet DB: Transfer (Intermediate) Magnet DB: Transfer functions of individual magnets functions of individual magnets
FQWG, 24-MAR -2006 5 R. Wolf, AT-MEL-MC
From data in the intermediate magnet From data in the intermediate magnet databasedatabase
Making of the LEP Transfer functions 1Making of the LEP Transfer functions 1
FQWG, 24-MAR -2006 6 R. Wolf, AT-MEL-MC
Making of the LEP Transfer functions 2Making of the LEP Transfer functions 2
Additional corrections/parametersAdditional corrections/parameters Proximity correction on transfer function for orbit correctors Ramp Starting delays according to the vacuumchamber type
(compensation of main component of vacuum chamber eddy currents) Current to inject in main quadrupoles and sextupoles to compensate
for quadrupole and sextupole components of vacuumchamber eddy currents
Setup cycling of the magnet circuits was to be defined.Setup cycling of the magnet circuits was to be defined.
Finally in all LEP lifetime 494 distinct transfer functions Finally in all LEP lifetime 494 distinct transfer functions and 66 distinct cycles were made and put in the control and 66 distinct cycles were made and put in the control database.database.
FQWG, 24-MAR -2006 7 R. Wolf, AT-MEL-MC
Control DB: Magnet Families Control DB: Magnet Families (circuits)(circuits)
The work to be done (looking back to LEP)The work to be done (looking back to LEP)
First stage and main job: defining and making all First stage and main job: defining and making all appropriate measurements.appropriate measurements.
Complete putting validated results in tables (Oracle in the Complete putting validated results in tables (Oracle in the LEP case) so as to be reasonably well accessible.LEP case) so as to be reasonably well accessible.
Agree with the operations people what is needed for LHC Agree with the operations people what is needed for LHC and in which format (AT & AB)and in which format (AT & AB)
Second stage (up to 1-st circulating beam)Second stage (up to 1-st circulating beam) Make intermediate measurement DB for easy access, Make intermediate measurement DB for easy access,
which is suitable for automatic generation of the field which is suitable for automatic generation of the field model for all circuits.model for all circuits.
Implement the magnet-related part of the control Implement the magnet-related part of the control database (AB’s job)database (AB’s job)
Determine transfer function and setup cycles for circuits Determine transfer function and setup cycles for circuits with help of the layout database(s)with help of the layout database(s)
Make various corrections/improvements based on Make various corrections/improvements based on measurements going on in parallel/cold-warm measurements going on in parallel/cold-warm correlations/......correlations/......
FQWG, 24-MAR -2006 11 R. Wolf, AT-MEL-MC
The work to be done (looking back to LEP)The work to be done (looking back to LEP)
Third stage (first two(?)years beam)Third stage (first two(?)years beam) Make various corrections/improvements based Make various corrections/improvements based
on magnetic and machine measurements going on magnetic and machine measurements going on in parallel. This is certain to be more on in parallel. This is certain to be more important than in LEP because of the time-important than in LEP because of the time-dependent nature of the field of the magnets dependent nature of the field of the magnets build with rutherford cables build with rutherford cables
Fourth stage (from year three).Fourth stage (from year three). Important improvements to machine coming Important improvements to machine coming
closer (luminosity upgrade...)closer (luminosity upgrade...) Not to forget stage 1.5, the sector test..............Not to forget stage 1.5, the sector test..............
FQWG, 24-MAR -2006 12 R. Wolf, AT-MEL-MC
ConclusionConclusion Measurements to be completed and valid data to be Measurements to be completed and valid data to be
properly stored for all magnets.properly stored for all magnets. It is urgent to agree with AB on the information to It is urgent to agree with AB on the information to
transmit and on it’s format. Operation people should be transmit and on it’s format. Operation people should be systematically involved from now on.systematically involved from now on.
Need to appoint an AT person who is full-time Need to appoint an AT person who is full-time responsible for the practical transmission of the field responsible for the practical transmission of the field model in the control system and who should have model in the control system and who should have professional database support.professional database support.
On going magnetic measurement program and On going magnetic measurement program and improvement of the field model to be expected for at improvement of the field model to be expected for at least two years after start-up.least two years after start-up.