LHC Beam Operation workshop - Evian 2011

Session

Session 4: Operational performance

13 Dec 2011, 08:30

Royal Hotel

Presentation materials

paper

Summary.pdf

15. Aperture & optics – measurements and conclusions

Stefano Redaelli

13/12/2011, 08:30

In 2011, the LHC has delivered collisions with different optics configurations in the four interaction points. The performance has been pushed during the year until a final configuration with 3 IPs squeezed to 1 m was achieved. Correspondingly, the machine aperture has been measured in the different configurations, at injection and at top energy, to ensure a safe operation in all conditions of...

22. Emittance preservation in LHC: Present understanding, possible improvements/gains, required diagnostics

Verena Kain

13/12/2011, 08:55

Emittance measurements during the LHC proton run 2011 indicated a blow-up of 20 % to 30 % from LHC injection to collisions. At the LHC design stage the total allowed emittance increase from SPS extraction to colliding beams was set to 7 %. This presentation will show the emittance preservation throughout the different parts of the LHC cycle and discuss the current limitations on emittance...

23. Intensity ramp-up: 2011 experience - Limitations, mitigation, risks, strategy, pushing it in 2012, 1380 in 3 weeks?

Markus Zerlauth

13/12/2011, 09:20

The experience with ramping up the beam intensities in the early days of the 2011 run and after the subsequent technical stops will be summarized. Weak points and limitations will be identified and their possible mitigations evaluated. In view of the risks and drawbacks of a too aggressive approach, possible improvements of the applied strategy whilst maintaining the required validation points...

24. Transverse feedback: high intensity operation, AGC, IGC, lessons for 2012

Daniel Valuch

13/12/2011, 09:45

The transverse damper system (ADT) plays an important role in the preservation of the beam transverse emittance and for damping of oscillations driven by the coupled bunch instability. An overview of the ADT system will be presented with an emphasis on the important feedback loop parameters as they change from injection through the ramp into collision. The dedicated setting up procedure...