Review of LHC and Injector Upgrade Plans Workshop (RLIUP)

Session

Session 4 - Upgrade scenario 2 (decoupled from scenario 1)

30 Oct 2013, 14:00

Centre de Convention, Archamps

Conveners

Session 4 - Upgrade scenario 2 (decoupled from scenario 1)

• Brennan Goddard (CERN)
• Roland Garoby (CERN)

Presentation materials

summary

Session4.pdf

17. How to maximize the HL-LHC performance (HL-LHC)? (20' + 10')

Riccardo De Maria (CERN)

30/10/2013, 14:00

Abstract: The contribution presents the baseline HL-LHC upgrade options (25ns LIU parameters, large aperture triplets, crab cavities) among the options that can maximize the LHC performance after LS3. The analysis covers the preservation of the LIU beam parameters from the injection process to stable conditions for physics, the minimization of the luminous region volume while preserving the...

18. Can we ever reach the HL-LHC requirements with the injectors (LIU)? (30' + 10')

Hannes Bartosik (Physics Division)

30/10/2013, 14:30

Abstract: The present intensity and brightness limitations of the LHC injector synchrotrons for 25 ns beams are space charge, beam loading, instabilities in the transverse and longitudinal planes and electron cloud effects. This paper reviews how these performance limitations are expected to change after implementing the mitigation measures foreseen within the Upgrade Scenario 2. The question...

19. How to implement all the HL-LHC upgrades (HL-LHC)? (20' + 10')

Lucio Rossi (CERN)

30/10/2013, 15:10

Abstract: The luminosity upgrade will require major changes in the LHC machine configuration: about 1.2 km of the machine will undergo major renovation or modification. In the talk we will review the list of all equipment foreseen to be replaced or additionally installed as new. We will review the plan of all upgrades that should start already prior to LS2 (with the installation of the first...

21. HL-LHC: Exploring alternative ideas (20' + 10')

Rogelio Tomas Garcia (CERN)

30/10/2013, 15:40

Abstract: The HL-LHC parameters assume unexplored regimes for hadron colliders in various aspects of accelerator beam dynamics and technology. This talk reviews various alternatives that could potentially improve the LHC performance, for example: the use of e-lens to compensate the beam-beam head-on interaction, the use of optical or coherent electron cooling to reduce the beam emittance (at...

22. LIU: Exploring alternative ideas (20' + 10')

Heiko Damerau (CERN)

30/10/2013, 16:30

Abstract: The baseline upgrade scenarios for the injector complex cover the connection of Linac4 to the PSB, the increase of the PSB-PS transfer energy from 1.4 GeV to 2 GeV and the major SPS RF upgrade during LS2. The achievable beam characteristics will nonetheless remain below the expectation of the HL-LHC project. Therefore, alternative or additional options like, e.g., special bunch...

23. How to reach the required availability of LHC to reach the required level? (20' + 10')

Mike Lamont (CERN)

30/10/2013, 17:00

Abstract: The HL-LHC has ambitious integrated luminosity goals in the region of 250 inverse femtobarn per year. This level of performance will required excellent machine availability. After a definition of terms and assumptions, the availability to date is reviewed while noting the importance of accurate and reliable tracking. The present consolidation strategy is outlined and the potential...

31. 50 ns back-up scenario (30'+10')

Dr Verena Kain (CERN)

30/10/2013, 17:30

Abstract: The baseline bunch spacing for LHC high luminosity proton-proton operation after LS1 is 25 ns to maximize the integrated luminosity while keeping pile-up low. The success of this mode of operation is not guaranteed. Electron cloud, UFOs, long-range beam-beam, heating and other effects might make 25 ns operation in the LHC and/or the injectors difficult. This talk will review possible...