LHC LUMI 2005

 CARE-HHH-APD Workshop on

Scenarios for the LHC Luminosity Upgrade


 

Arcidosso, Italy, 31 August–3 September 2005

 

Arcidosso, Castello Aldobrandesco,

Hotel Toscana, other hotels

 

workshop announcement (pdf file)

Registration      list of participants       Literature       Proceedings

      organizing committee    Directions to Arcidosso     Poster     Photo

APD

Accelerator Physics and synchrotron Design


 

WORKSHOP ROGRAMME

 

Morning: Plenary Sessions, Afternoon: Two Parallel Working Groups

(WG1 presentations, WG2 presentations)


Workshop Plenary Sessions

 

Opening Session

chair Emmanuel Tsesmelis (CERN), scientific secretary Frank Zimmermann (CERN)

Wednesday 31st AUGUST 09:30-13:00

Physics Motivation for an LHC Luminosity Upgrade (slides)

- increased potential for discoveries

- energy vs luminosity upgrade?

- LHC upgrade vs new projects (ILC, beta-beams and nu-factory, nuclear physics)

M. Mangano (CERN) 09:30-10:15

Machine-Detector Interface (CMS slides, ATLAS slides by S. Tapprogge )

- (debris towards the triplet or dipole-first)
- beam halo (halo towards the experiments)
- shorter L*
- more bunches (12.5 ns vs 15 ns)
- front-end electronics and computing
- upgrade scedule (when? how long the stop should be?)

F. Palla (INFN Pisa) 10:15-11:00
COFFEE BREAK   11:00-11:30

LHC beam parameters and IR upgrade options (slides)
- list of scenarios
- expected beam physics issues

F. Ruggiero (CERN)

11:30-12:15

Fast pulsed high energy injectors (slides)

- list of scenarios
- expected beam physics and technological issues

W. Scandale (CERN) 12:15-13:00

 

Afternoon 1: Working Groups

Wednesday 31st AUGUST 14:30-19:00

Parallel Sessions of Working Groups 1 and 2

  14:30-16:30
COFFEE BREAK   16:30-17:00

Parallel Sessions of Working Groups 1 and 2

  17:00-19:00

 

Session 1: Optics & Layout

chair Pantaleo Raimondi (INFN Frascati), scientific secretary Rogelio Tomas (CELLS)

Thursday 1st SEPTEMBER 09:00-13:00

News from the two Working Groups (WG1 slides)

O. Brüning and W. Scandale (CERN) 09:00-09:30

Progress of US-LARP activities on LHC IR Upgrade (slides)

T. Sen (FNAL) 09:30-10:15

Possible Dipole First Options and Challenges (slides)

general advantages and disadvantages, IR layouts and magnet cross-sections, magnets with non-parallel coils, magnetic TAS and neutron absorber

O. Brüning (CERN) 10:15-10:45

Optics Design for Dipole First Options (slides)

dispersion matching, partially squeezed optics, Q' correction and momentum acceptance

R. De Maria (CERN) 10:45-11:00
COFFEE BREAK   11:00-11:30

Possible quadrupole-first options with β*<=0.25 m (slides)
general advantages and disadvantages, possible optical solutions, triplet aperture, size, and crossing angle, chromatic effects, sensitivity to field errors and minimum achievable β*

J.-P. Koutchouk (CERN) 11:30-12:15

Optical requirements for the magnetic lattice of the high energy injectors (slides)

challenges, priorities, and possible hints for the optics design of a new Super-SPS (100 GeV → 1 TeV) and a Super-ISR (30 GeV → 100 GeV, probably 3 rings able to fill the Super-SPS in about 3 seconds). These new injectors will make use of fast pulsing SC magnets, to be developed and specified at CERN in collaboration with other labs: the optics design should aim at very small beam losses and allow for slow-extracted test beams.

G. Arduini (CERN) 12:15-13:00

 

 Afternoon 2: Working Groups

Thursday 1st SEPTEMBER 14:30-19:00

Special Session of Working Group 2 (participation from both Working Groups is encouraged) covering:

luminosity lifetime, integrated luminosity, turnaround time, and related issues, increase in integrated luminosity due to injector upgrade, experience at HERA & Tevatron, snap-back at higher injection energy

M. Bieler (slides)

R. Calaga (slides)

T. Sen (slides)

M. Buzio (slides)

14:30-16:30
COFFEE BREAK   16:30-17:00

Parallel Sessions of Working Groups 1 and 2

  17:00-19:00

 

 

Session 2: High-Intensity Effects

chair Francesco Ruggiero (CERN), scientific secretary Giovanni Rumolo (CELLS)

Friday 2nd SEPTEMBER 09:00-13:00

News from the two Working Groups (WG1 slides, WG2 slides)

O. Brüning and W. Scandale (CERN) 09:00-09:30

Progress of beam-beam compensation schemes (slides)

Reviewing wire-based beam-beam compensation experiments in the SPS; prospects of wire-compensation studies at RHIC; exploratory ideas for future pulsed wire devices; simulations of LHC wire compensation; requirements for LHC crab cavities

F. Zimmermann (CERN) 09:30-10:15

High brilliance and closer bunches from the LHC injectors (slides)

R&D priorities, limitations of the existing injectors, and possible hints for the design of a new Super-SPS and a Super-ISR. At this very preliminary stage this talk will help understanding optimal injection and extraction energy, impedance limits, and control of collective instabilities.

E. Shaposhnikova (CERN) 10:15-11:00
COFFEE BREAK   11:00-11:30

Beam collimation and control in the high energy injectors (slides)
beam halo formation, collimation and beam losses, as well as challenges, R&D priorities, and possible hints for the design of the collimation system of a new Super-SPS and a Super-ISR. At this very preliminary stage will help understanding the basic requirements and development cost of the new collimation systems required to keep beam losses at a reasonably low level, compatible with the heating budget of these new pulsed magnets.

N. Catalan (CERN) 11:30-12:15

New RF systems for the Super-ISR and Super-SPS (slides)

challenges, R&D priorities, and possible hints for the RF system design of a new Super-SPS (100 GeV → 1 TeV) and a Super-ISR (30 GeV → 100 GeV, probably 3 rings able to fill the Super-SPS in about 3 seconds). At this very preliminary stage this talk will help understanding the basic requirements and development cost of the new RF systems.
- maybe address also Crab cavities for the IR upgrade?

J. Tuckmantel (CERN) 12:15-13:00 

 

Afternoon 3: Working Groups

Friday 2nd SEPTEMBER 14:30-19:00
Parallel Sessions of Working Groups 1 and 2   14:30-16:30
COFFEE BREAK   16:30-17:00

Parallel Sessions of Working Groups 1 and 2

  17:00-19:00

 

 

Closing Session

Saturday 3rd SEPTEMBER 09:30-13:00

Summary of Opening Session (slides)

E. Tsesmelis (CERN) 09:30-10:00

Summary of Session 1 on Optics and Layout (slides)

P. Raimondi (INFN) 10:00-10:30

Summary of Session 2 on High Intensity Effects (slides)

F. Ruggiero (CERN) 10:30-11:00
COFFEE BREAK   11:00-11:30

Report from WG 1 on LHC IR Upgrade (slides)

O. Brüning (CERN) 11:30-12:00

Report from WG 2 on High Energy Injectors (slides)

W. Scandale (CERN) 12:00-12:30

Final Discussion

  12:30-13:00
Adjourn   13:00

 

Working Group 1 on LHC IR Upgrade (presentations)

convener Oliver Brüning (CERN), scientific secretary Ezio Todesco (CERN)

 

Goals:

Enumerate all possible IR solutions for the LHC-upgrade.

Establish self-consistent ‘packages’ including IR layout, correctors and compensation devices.

Rank them on the following criteria:

bullet

β* vs beta_peak in the triplet

bullet

triplet aperture and crossing angle

bullet

chromatic effects and sensitivity to field errors in the triplet

bullet

layout and compatibility with the existing experimental devices

bullet

need of technological improvement of the triplet magnets

(Nb3Sn? - quads size and aperture? - radiation resistance?)

bullet

beam-beam compensation and Crab cavities: do we really need them?

 

Working Group 2 on High Energy Injectors (presentations)

convener Walter Scandale (CERN), scientific secretary Gianluigi Arduini (CERN)

 

Goals address the following issues:

bullet

advantages of new high energy injectors for the LHC luminosity upgrade

bullet

optical layout

bullet

optics of super-ISR straight sections for extraction

bullet

possible reduction of dispersion in the Super-ISR

more quadrupoles, lower filling factor for dipoles (60%?, B < 5 T)

bullet

need of extracted beams

bullet

optimal injection energy

bullet

optimal top energy

bullet

limitations of the existing injectors

bullet

impedance limits and control of collective instabilities

bullet

kickers and RF systems impedance optimization

bullet

beam halo formation, collimation, and beam losses magnet heating budget

bullet

transfer lines from Super-ISR to Super-SPS

bullet

transfer lines from Super-SPS to LHC

bullet

cost drivers (including R&D): pulsed magnets and cryogenic systems versus

        RF systems, kickers, power converters, transfer lines and other sub-systems

 


Local organizing committee:
P. Freguglia (INFN),

F. Ruggiero (CERN), W. Scandale (CERN), F. Zimmermann (CERN),
C. Bosteels (CERN), Romain Basset (CERN)

Please contact Claudine.Bosteels@cern.ch if you have questions


Last modified on 11/02/2005 18:29  by