20-jan-09 madrid, spain global design effort 1 barry barish madrid, spain 20-jan-09 designing the...

20-Jan-09 Madrid, Spain Global Design Effort 1

Barry BarishMadrid, Spain

20-Jan-09

Designing the ILC

ATF-2 Final Doublet System

20-Jan-09 Madrid, Spain Global Design Effort 2Global Design Effort 2

• Introduction to the ILC Global Design Effort• The motivation: science potential• Status and plans• Key elements of the accelertor R&D and

design effort • Detectors• Final Remarks

Outline


Why e+e- Collisions ?

• elementary particles

• well-defined

– energy,

– angular momentum

• uses full COM energy

• produces particles democratically

• can mostly fully reconstruct events


LHC: Low mass Higgs: H ggMH < 150 GeV/c2

Rare decay channel: BR ~ 10-3

Requires excellent electromagnetic calorimeter performance

acceptance, energy and angle resolution,

g/jet and g/p0 separation Motivation for LAr/PbWO4 calorimeters

for CMS

Resolution at 100 GeV: 1 GeV

Background large: S/B 1:20, but can estimate from non signal areas CMS


ILC: Precision Higgs physics

Model-independent Studies

• mass

• absolute branching ratios

• total width

• spin

• top Yukawa coupling

• self coupling

Precision MeasurementsGarcia-Abia et al


The linear collider will measure the spin of any Higgs it can produce by measuring the energy dependence from threshold

How do you know you have discovered the Higgs ?

Measure the quantum numbers. The Higgs must have spin zero !


Precision measurements of the Higgs?

Precision measurements of Higgs coupling

Higgs Coupling strength is proportional to Mass


Studying the Higgs

SM 2HDM/MSSM

Yamashita et al Zivkovic et al

Determine the underlying model


How the physics defines the ILC


Parameters for the ILC

• Ecm adjustable from 200 – 500 GeV

• Luminosity ∫Ldt = 500 fb-1 in 4 years

• Ability to scan between 200 and 500 GeV

• Energy stability and precision below 0.1%

• Electron polarization of at least 80%

• The machine must be upgradeable to 1 TeV


ILC – Underlying Technology

• Room temperature copper structures

OR

• Superconducting RF cavities


SCRF Technology Recommendation

• The recommendation of ITRP was presented to ILCSC & ICFA on August 19, 2004 in a joint meeting in Beijing.

• ICFA unanimously endorsed the ITRP’s recommendation on August 20, 2004


Superconducting RF Technology

• Forward looking technology for the next generation of particle accelerators: particle physics; nuclear physics; materials; medicine

• The ILC R&D is leading the way Superconducting RF technology– high gradients; low noise; precision optics


main linacbunchcompressor

dampingring

source

pre-accelerator

collimation

final focus

IP

extraction& dump

KeV

few GeV

few GeVfew GeV

250-500 GeV

Designing a Linear Collider

Superconducting RF Main Linac


Luminosity & Beam Size

• frep * nb tends to be low in a linear collider

• Achieve luminosity with spot size and bunch charge

Dyx

repb HfNn

L2

2

L frep [Hz] nb N [1010] x [mm] y [mm]

ILC 2x1034 5 3000 2 0.5 0.005

SLC 2x1030 120 1 4 1.5 0.5

LEP2 5x1031 10,000 8 30 240 4

PEP-II 1x1034 140,000 1700 6 155 4


• Low emittance machine optics• Contain emittance growth• Squeeze the beam as small as possible

Achieving High Luminosity

~ 5 nmInteraction Point (IP)

e- e+


– 11km SC linacs operating at 31.5 MV/m for 500 GeV– Centralized injector

• Circular damping rings for electrons and positrons• Undulator-based positron source

– Single IR with 14 mrad crossing angle– Dual tunnel configuration for safety and availability

ILC Reference Design

Reference Design – Feb 2007

Documented in Reference Design Report


RDR Design Parameters

Max. Center-of-mass energy 500 GeV

Peak Luminosity ~2x1034 1/cm2s

Beam Current 9.0 mA

Repetition rate 5 Hz

Average accelerating gradient 31.5 MV/m

Beam pulse length 0.95 ms

Total Site Length 31 km

Total AC Power Consumption ~230 MW


ILC RDR – A Complete Concept

• Reference Design Report (4 volumes)

ExecutiveSummary

Physicsat theILC

AcceleratorDetectors


RDR Design Parameters

Max. Center-of-mass energy 500 GeV

Peak Luminosity ~2x1034 1/cm2s

Beam Current 9.0 mA

Repetition rate 5 Hz

Average accelerating gradient 31.5 MV/m

Beam pulse length 0.95 ms

Total Site Length 31 km

Total AC Power Consumption ~230 MW


Next: Build a Solid Technical Design

• Complete crucial R&D to reduce technical risk– SCRF gradient; final focus; electron cloud

• Optimize the ILC design for coherence, simplicity and cost / performance– Minimum Machine

• Develop capability to industrialize, construct ILC worldwide and develop international model for governance– Project Implementation Plan


ILC-GDE Organization Chart

SCRF-ML G-CFS AS

EU

AM

AS

ILCSC FALC

ILC-GDE Director

Regional Directors

Project Managers

AAP

PAC FALC-RG

Director’s Office= ~ Central Team

= ~ EC

Experts

Project. M. Office- EDMS- Cost & Schedule- Machine Detector Interface- ILC, XFEL, Project X liaison- ILC Communications


TD Phase 1

• Timescale: Interim report mid 2010• Major theme: High-priority risk-mitigating

R&D and studies of cost reduction ideas– R&D demonstrations of critical items

– Minimum design -- top down cost/performance optimizaton to develop a new baseline by 2010

– Studies of governance models for a global project– Development of a site selection plan with ILCSC– Or how do we reduce the time to construction start and

therefore to physics results?


• Timescale: Produce report by mid-2012• First goal: New baseline design

– SCRF – S1 Test of one RF unit

– Detailed technical design studies–

– Updated VALUE estimate and schedule

– Remaining critical R&D and technology demonstration

• Second Goal: Project Implementation Plan.

TD Phase 2


R&D Plan - Technical Design Phase

• First Official Release June 08

• A 50 page document with details of all programs and schedules

• New: Release 3

Global Design Effort


Detector Concepts Report


detectorB

may be accessible during run

accessible during run Platform for electronic and

services (~10*8*8m). Shielded (~0.5m of concrete) from five sides. Moves with detector. Also provide vibration isolation.

Push-Pull Concept for two detectors

The concept is evolving and details being worked out

detectorA


Detector Performance Goals• ILC detector performance requirements and

comparison to the LHC detectors:○ Inner vertex layer ~ 3-6 times closer to IP

○ Vertex pixel size ~ 30 times smaller

○ Vertex detector layer ~ 30 times thinner

Impact param resolution Δd = 5 [μm] + 10 [μm] / (p[GeV] sin 3/2θ)

○ Material in the tracker ~ 30 times less

○ Track momentum resolution ~ 10 times better

Momentum resolution Δp / p2 = 5 x 10-5 [GeV-1] central region

Δp / p2 = 3 x 10-5 [GeV-1] forward region

○ Granularity of EM calorimeter ~ 200 times better

Jet energy resolution ΔEjet / Ejet = 0.3 /√Ejet

Forward Hermeticity down to θ = 5-10 [mrad]


Detector Performance Goals


Detector Plans


Final Remarks

• The accelerator design is now in the technical design phase, which will culminate in 2012 with completion of crucial R&D and optimized cost / performance / risk design (see M Ross – next talk)

• The physics simulations and detector development are equally challenging. There are opportunities in fundamental detector R&D, in detector design, simulations, etc

• The science motivation for a lepton collider is very strong. We await LHC for validation, and then we should be ready to make a strong proposal.


Final Comment

• Over the next few years we must put together an irresistible case to achieve our dream of building a new major global particle accelerator

• You may ask whether we have the will, motivation and strength to succeed??

• Borrowing from hope, success and inspiration of our new U.S. president (by 6pm tonite).

YES WE CAN!!

20-jan-09 madrid, spain global design effort 1 barry barish madrid, spain 20-jan-09 designing the...

Documents

low mass higgs

low emittance machine

ilc atf

energy dependence

accelertor rd

underlying modelhow

nminteraction point

high luminosity