HL-LHC WP2 Brainstorming Meeting

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Purpose of this meeting: Introduce the main objectives of the new HL-LHC project:

• Prepare technical proposal by 2013 for a luminosity upgrade in the LHC by 2020 with goal of 5 1034 cm-2 sec-1 sustainable luminosity and integrated luminosity of 3000 fb-1 (merger of Phase 1 and sLHC upgrade projects).

Introduce the main objectives for WP2 of HL-LHC: • Develop one to three baseline configurations for the upgrade (e.g. based on NbTi; Nb3Sn or hybrid technology).

Collect ideas and proposals for tasks within WP2: • e.g. B-B studies for baseline configuration(s) (6D beam-beam, chaos onset, minimum required x-ing angle ( DA vs x-ing), with and without wire; CRAB cavities etc

Collect proposals of potential collaborators for WP2: • EU members (EU funding); US (relation with USLARP?); other (required collaboration agreement?)

O. Brüning – BE-ABPHL-LHC meeting 8. September 2010

HL-LHC WP 2 Brainstorming Meeting

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Interesting Suggestions:

Introduce a Parameter and Layout Committee: • Assure consistent sets of parameters for the pursued options.

Maintain a central website: • Central repository with all related files and programs.

Evaluate need for formal collaboration agreements: • e.g. KEK and TRIUMF

O. Brüning – BE-ABPHL-LHC meeting 8. September 2010

HL-LHC Work Package 2 Brainstorming

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Confirmed Collaboration interests:Europe:

• Crockcroft: Andy Wolski, Maxim Korostelev, Deepa Angal-Kalinin, Rob Appleby, Kay Hock• IFIC University Valencia: Angeles Faus-Golfe• CEA Grenoble: NN

US: • SLAC: Uli Wienands; Thomas Markiewicz• FNAL: Vladimir Shiltsev +; Eric Prebis (USLARP)• BNL: Wolfram Fischer; Rama Calaga

Asia: • KEK: Kazuhito Ohmi

O. Brüning – BE-ABPHL-LHC meeting 8. September 2010

HL-LHC Work Package 2 Brainstorming

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Wished for Collaboration without confirmation:

Europe: • INFN: e.g. Pantaleo Raimondi• FZK: Anke Müller• PSI-EPFL: Leonid Rifkin

Canada: • Triumf: Fred Jones, Dobrin Kaltchev

Asia: • KEK: Etienne Forest

O. Brüning – BE-ABPHL-LHC meeting 8. September 2010

HL-LHC Work Package 2 Brainstorming

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Issues for WP2:

NbTi versus Nb3Ti technology: • different performance reach (*, aperture, length etc.)• shielding and aperture requirements• close link with WP3 and WP5

Layout options: • L* (close link with WP7)• options for local correction of chromatic aberrations (triplet & IR layout)• local CC installations (close link with WP4)• 2-in-1 triplet design with large x-ing angle and CC (close link with WP4)

Beam parameter optimization: • operational experience from LHC• close link with Injector complex upgrade and consolidation Projects

O. Brüning – BE-ABPHL-LHC meeting 8. September 2010

HL-LHC Work Package 2 Brainstorming

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Tentative Task List:

1) Communication & management:

2) Optics & Layout: • NbTi solutions with and without local CC; L*; round and flat beams; 2-in-1• Nb3Sn solutions with and without local CC; L*; round and flat beams; 2-in-1• Novel solutions for correction of chromatic aberrations (a la SF & PR)• IR4 layout and solution with global CC

magnet parameters (aperture and length)

3) Single particle studies: • DA studies and FQ specifications• Correction strategy and corrector specifications

magnet parameters (FQ and corrector elements)

O. Brüning – BE-ABPHL-LHC meeting 8. September 2010

HL-LHC Work Package 2 Brainstorming

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Tentative Task List:

4) Collective Effects: • BB long range compensation schemes• BB limit for round and flat beams and coupling tolerances for flat beams• Head-on BB compensation schemes and options• Impedance estimates for new layout (collimator and aperture dependent)• IBS estimates for different beam configurations

beam separation; optimum configuration (flat beams vs round beams)

5) Beam Parameters and Luminosity optimization: • L reduction and leveling (CC and poor man leveling via x-ing angle)• Evaluation of operation experience of first 2 year LHC operation• Options for beam parameter variation for L optimization during run (e.g. Q)

beam parameter set (n, Nb, s etc.)

O. Brüning – BE-ABPHL-LHC meeting 8. September 2010

HL-LHC Work Package 2

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Next Steps:

Prepare detailed activity lists for each task: • Circulation via email with potential second telephone meeting.

Follow-up on missing collaborators: • One-to-one contacts.

Prepare pairs of collaborators and task: • Identification of contributors for each task

O. Brüning – BE-ABPHL-LHC meeting 8. September 2010