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LHC On-Line Modeling. Goal of the LHC On-line Model The Team and the Tasks Status of MAD-X Scheme of the LHC On-line Model Interface to LSA Examples of NL measurements to understand the “real” model Conclusion. Goal of the LHC On-Line Model?. Main design features:

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slide1

LHC On-Line Modeling

  • Goal of the LHC On-line Model
  • The Team and the Tasks
  • Status of MAD-X
  • Scheme of the LHC On-line Model
  • Interface to LSA
  • Examples of NL measurements to understand the “real” model
  • Conclusion

ESRF-NLBDWS, May 2008

slide2

Goal of the LHC On-Line Model?

  • Main design features:
    • MAD-X is the principle engine of the LHC on-line model.
    • A complete and trustworthy (non-)linear model of the LHC will be composed with the databases of the measured magnet errors and beam-based measurements.
    • Testing of knobs with MAD-X before send-to-hardware.
    • The online model is not a real-time tool but should give answers within in minutes.
    • All functionalities of MAD-X are utilized  Duplication with other tools may occur but the emphasis is on uncovered features.
    • Experimenters and operators should profit from a fully functional on-line tool.
    • Speed-up the off-line analysis time such that it can be done in the control room.

ESRF-NLBDWS, May 2008

slide3

The Team and Tasks

  • Frank Schmidt –Overall Responsibility, MAD-X General Support, (Non-)linear LHC Model from Fidel/Wise
  • Werner Herr – Responsibility for Applications, SDDS MAD-X Version, Closed Orbit Correction
  • Ilya Agapov – Interface to Control System, Application Development, Beam-Based Model Adjustments, PTC_TWISS module
  • Massimo Giovannozzi, Thys Risselada – LHC Optics, Fidel/Wise, MAD-X Error Routines
  • In Collaboration with:
  • Fidel & Wise (Laurent Deniau, Luca Bottura, Rob Wolf and team & Per Hagen) - Harmonics
  • Rogelio Tomás,Masamitsu Aiba & Akio Morita (KEK), Rama Calaga (BNL) , GlennVanbavinckhove – Beta-Beating
  • Gianluigi Arduini, Jörg Wenninger, V. Kain – SPS Operation, 1000 turn BPM system, Standardization of SDDS
  • LSA Team (Mike Lamont, Greg Kruk, Jutta Netzel) – General control system support
  • Alastair Bland – TECHNET Support

ESRF-NLBDWS, May 2008

slide4

Status of MAD-X

  • Is MAD-X ready for the LHC commissioning? 
  • Is MAD-X properly maintained? ABP no longer provide several exclusive FTEs for program development and maintenance, instead there is one code custodian and a large group of MAD-X Module Keepers.
  • Is MAD-X still further developed? ABP has stopped the full blast develop- ment of MAD-X since the code fulfills the minimum LHC requirements. However, work is being done for a full PTC object oriented LHC on-line model. 
  • Is MAD-X reliable? MAD-X has made use of the well debugged MAD8. Moreover, the independent programs SixTrack and PTC provide a continuous check such that any inconsistency could be eliminated.
  • Is MAD-X fast? There is some speed loss compared to MAD8 due to the mixture of Fortran and C. The object oriented PTC extension is more time consuming by definition.

ESRF-NLBDWS, May 2008

slide5

1

2

Beam

Errors

Fidel/Wise

Misalignment

Closed Orbit

Hardware

Sequence

Strength

Camif

Aperture Model

DB

Scheme of the On-Line Model

Off-line Model

Real Model of the Machine

Knobs

Feed-back

ESRF-NLBDWS, May 2008

interface to lsa

OM Manager

OM Server

LSA Data

lhcutils Library (Python)

Java Libraries

LSA Client Program

(E.G. Knobs)

Repository of Optics files, MAD-X and other Scripts

Interface to LSA

Application Data Access

ESRF-NLBDWS, May 2008

slide7

Relation Accelerator versus Computer Model

Accelerator Model

Accelerator

Single particle tracking data

BPM data

FFT spectral lines

FFT spectral lines

  • detuning with amplitude
  • resonance driving terms

ESRF-NLBDWS, May 2008

slide8

Missing Sextupoles (SPS)

(F. Schmidt, R. Tomas et al.)

Before

Specially arranged SPS configuration for extraction sextupoles

+ + + + - - - -

(3,0) resonance driving terms

Data fully decohered (factor 2 correction applied)

Comparison with nominal model

One extraction sextupole accidentally disconnect

After

ESRF-NLBDWS, May 2008

slide9

Uncompensated Skew Sextupole Resonance (PSBooster) (P. Urschütz, M. Benedikt)

phase space

vertical motion

CERN PS data

vertical plane

3Qy = 16

and

(0, -2) spectral line

Uncorrected machine

beam losses

FFT

ESRF-NLBDWS, May 2008

slide10

Corrected Skew Sextupole Resonance (PSBooster) (P. Urschütz, M. Benedikt)

phase space

CERN PS data

vertical plane

3Qy = 16

and

(0, -2) spectral line

Resonance compensated with skew sextupoles

Setting based on the reduction of the (0, -2) line amplitude

vertical motion

beam losses

FFT

ESRF-NLBDWS, May 2008

slide11

Longitudinal Location of strong Sextupoles (Tevatron) Y. Alexahin, F. Schmidt et al. EPAC06

(3,0) resonance detection from (-2,0) spectral line at Tevatron

Tracking data

Beam data

ESRF-NLBDWS, May 2008

slide12

Conclusion

  • Release of the Online Model Software
  • Model of the LHC (still work in progress)
  • Experiments and Testing
    • Applying the Online Model in the SPS start-up with beam.
    • Complementing the theoretical SPS model with beam-based corrections  needed for the LHC.
  • Being ready for Sector Test and LHC Commissioning!

ESRF-NLBDWS, May 2008

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