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International Linear Colllider International Linear Colllider - - PowerPoint PPT Presentation

Nov 13, 2022 258 likes •620 views

International Linear Colllider International Linear Colllider Global Design Effort Global Design Effort Barry Barish ILCSC - Frankfurt 10-May-05 Starting Point for the GDE pre-accelerator few GeV source KeV damping extraction ring

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SLIDE 1

International Linear Colllider International Linear Colllider Global Design Effort Global Design Effort

Barry Barish ILCSC - Frankfurt 10-May-05

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SLIDE 2

10-May-05 ILCSC 2

Starting Point for the GDE

main linac bunch compressor damping ring source pre-accelerator collimation final focus IP extraction & dump KeV few GeV few GeV few GeV 250-500 GeV

Superconducting RF Main Linac Superconducting RF Main Linac

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SLIDE 3

10-May-05 ILCSC 3

“Target” 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
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SLIDE 4

10-May-05 ILCSC 4

TESLA Concept

  • The main linacs based on 1.3

GHz superconducting technology operating at 2 K.

  • The cryoplant, is of a size

comparable to that of the LHC, consisting of seven subsystems strung along the machines every 5 km.

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SLIDE 5

10-May-05 ILCSC 5

TESLA Cavity

  • RF accelerator structures consist of close to 21,000

9-cell niobium cavities operating at gradients of 23.8 MV/m (unloaded as well as beam loaded) for 500 GeV c.m. operation.

  • The rf pulse length is 1370 µs and the repetition rate

is 5 Hz. At a later stage, the machine energy may be upgraded to 800 GeV c.m. by raising the gradient to 35 MV/m.

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SLIDE 6

10-May-05 ILCSC 6

Reference Points for the ILC Design

TESLA TDR 500 GeV (800 GeV) 33km 47 km US Options Study 500 GeV (1 TeV)

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SLIDE 7

10-May-05 ILCSC 7

TESLA Test Facility Linac

laser driven electron gun photon beam diagnostics undulator bunch compressor superconducting accelerator modules pre- accelerator e- beam diagnostics e- beam diagnostics 240 MeV 120 MeV 16 MeV 4 MeV

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SLIDE 8

10-May-05 ILCSC 8

Experimental Test Facility - KEK

  • Prototype Damping Ring for X-band Linear Collider
  • Development of Beam Instrumentation and Control
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SLIDE 9

10-May-05 ILCSC 9

Evaluation: Technical Issues

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SLIDE 10

10-May-05 ILCSC 10

GDE – Near Term Plan

  • Organize the ILC effort globally

– First Step --- Appoint Regional Directors within the GDE who will serve as single points of contact for each region to coordinate the program in that region. – Make Website, coordinate meetings, collaborative R&D, etc

  • Represent the ILC internationally

– Represent the ILC internationally – Outreach to our community and beyond

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SLIDE 11

10-May-05 ILCSC 11

GDE – Near Term Plan

  • Staff the GDE

– Administrative, Communications, Web staff – Regional Directors (each region) – Engineering/Costing Engineer (each region) – Civil Engineer (each region) – Key Experts for the GDE design staff from the world community (please give input) – Fill in missing skills (later)

Total staff size about 20 FTE (2005-2006)

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SLIDE 12

10-May-05 ILCSC 12

GDE – Near Term Plan

  • Schedule
  • Begin to define Configuration (Aug 05)
  • Baseline Configuration Document by end of 2005
  • Put Baseline under Configuration Control (Jan

06)

  • Develop Conceptual Design Report by end of

2006

  • Three volumes -- 1) Conceptual Design Report;

2) Shorter glossy version for non-experts and policy makers ; 3) Detector Concept Report

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SLIDE 13

10-May-05 ILCSC 13

GDE – Near Term Plan

  • What is the Conceptual Design Report

– Include site dependence – 3 or more sample sites – Detector Design Concept / Scope (1 vs 2,

  • ptions, etc)

– Reliable Costs – strong emphasis during design

  • n cost consciousness --- value Engineering,

trade studies, industrialization, etc

  • This report will be the basis for moving on to a

technical design to be ready before physics from the LHC establishes the science case.

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SLIDE 14

10-May-05 ILCSC 14

GDE – Near Term Plan

– R&D Program

  • Coordinate worldwide R & D efforts, in order to

demonstrate and improve the performance, reduce the costs, attain the required reliability,

  • etc. (Proposal Driven to GDE)
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SLIDE 15

10-May-05 ILCSC 15

International/Regional Organization

ILC-Americas Regional Team

Regional Director and Deputy Institutional ILC Managers for major instiutional members

Cornell

ILC-NSF PI

TRIUMF

ILC-Canada Manager

NSF-funded Institutions Canadian Institutions

Lead Labs Work Package Oversight ILCSC GDE - Director Regional

USLCSG Funding Agencies

FNAL

ILC-FNAL Manager WP 1.FNAL WP 1.ANL WP 3.FNAL

SLAC

ILC-SLAC Manager WP 2.SLAC WP 2.BNL WP 3.SLAC communications

ILC-Asia ILC-Europe

International Regional

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SLIDE 16

10-May-05 ILCSC 16

ILC Design Issues

First Consideration : Physics Reach

ILC Parameters

Energy Reach

2

cm fill linac RF

E b L G =

RF AC BS cm y

P L E η δ γε ∝

Luminosity

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SLIDE 17

10-May-05 ILCSC 17

Working Parameter Set

“Point Design” “Point Design”

Center of Mass Energy 500 1000 GeV Design Luminosity 2 3 1034cm-2sec-1 Linac rf frequency GHz Accelerating gradient MV/m Pulse repetition rate Hz Bunches/pulse Bunch separation nsec Particles/bunch x1010 Bunch train length µsec Beam power 11 23 MW/beam σx/σy at IP 655/7 554/4 nm Site AC power 180 356 MW 5 1.3 2 866 2820 307 30

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SLIDE 18

10-May-05 ILCSC 18

GDE w ill do a “Parametric” Design

nom low N lrg Y low P

N

×1010 mm, nm cm, mm nm % mm

Pbeam

MW

11 11 11 5.3

L

×1034

2 2 2 2 2 1 2 2

nb

2820 5640 2820 1330

ex,y

9.6, 40 10,30 12,80 10,35

bx,y

2, 0.4 1.2, 0.2 1, 0.4 1, 0.2

sx,y

543, 5.7 495, 3.5 495, 8 452, 3.8

Dy

18.5 10 28.6 27

dBS

2.2 1.8 2.4 5.7

sz

300 150 500 200

Range of param eters design to achieve 2 ×1 0 3 4

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SLIDE 19

10-May-05 ILCSC 19

Tow ards the ILC Baseline Design

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SLIDE 20

10-May-05 ILCSC 20

TESLA Cost Estimate

3,136 M€

(no contingency, year 2000) + ~7000 person years

e- Beam Transport XFEL e- Damping Ring HEP & XFEL Experiments e- Main LINAC e+ Beam delivery e+ Main LINAC e+ Damping Ring e- Sources e+ Beam Transport e- Beam delivery e+ Source e- Switchyard XFEL PreLinac PreLinac Beam Dumps

DESY site Weste rhorn

T ESLA m a c hine sc hem a tic view

Power Water & Cryogenic Plants

Machine cost distribution

Main LINAC Modules Main LINAC RF System Civil Engineering Machine Infrastructure X FEL Incrementals Damping Rings HEP Beam Delivery Auxiliary Systems Injection System

1131

~ 33 km

587 546 336 241 215 124 101 97 Million Euro

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SLIDE 21

10-May-05 ILCSC 21

RF SC Linac Challenges

Energy: 500 GeV, upgradeable to 1000 GeV

  • RF Accelerating Structures

– Accelerating structures must support the desired gradient in an operational setting and there must be a cost effective means of fabrication. – ~17,000 accelerating cavities/500 GeV – Current performance goal is 35 MV/m, (operating at 30 MV/m)

  • Trade-off cost and technical

risk.

1 m

Risk Cost

~Theoretical Max

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SLIDE 22

10-May-05 ILCSC 22

Electro-polishing

(Improve surface quality -- pioneering work done at KEK) BCP EP

  • Several single cell cavities at g > 40 MV/m
  • 4 nine-cell cavities at ~35 MV/m, one at 40 MV/m
  • Theoretical Limit 50 MV/m
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SLIDE 23

10-May-05 ILCSC 23

Gradient

Results from KEK-DESY collaboration must reduce spread (need more statistics)

single-cell measurements (in nine-cell cavities)

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SLIDE 24

10-May-05 ILCSC 24

New Cavity Shape for Higher Gradient?

TESLA Cavity

  • A new cavity shape with a small Hp/Eacc ratio around

35Oe/(MV/m) must be designed.

  • Hp is a surface peak magnetic field and Eacc is the electric

field gradient on the beam axis.

  • For such a low field ratio, the volume occupied by magnetic

field in the cell must be increased and the magnetic density must be reduced.

  • This generally means a smaller bore radius.
  • There are trade-offs (eg. Electropolishing, weak cell-to-cell

coupling, etc)

Alternate Shapes

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SLIDE 25

10-May-05 ILCSC 25

Gradient vs Length

  • Higher gradient gives shorter linac

– cheaper tunnel / civil engineering – less cavities – (but still need same # klystrons)

  • Higher gradient needs more refrigeration

– ‘cryo-power’ per unit length scales as G2/Q0 – cost of cryoplants goes up!

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SLIDE 26

10-May-05 ILCSC 26

Klystrons

  • RF power generation and delivery

– The rf generation and distribution system must be capable of delivering the power required to sustain the design gradient:

  • 10 MW × 5 Hz × 1.5 msec
  • ~700 klystrons and modulators for 500 GeV

– The rf distribution system is relatively simple, with each klystron powering 30-36 cavities.

  • Status

– Klystrons under development by three vendors (in Europe, Japan, and U.S.)

  • Three units from European vendor (Thales) have come

close to meeting spec.

  • Sheet beam under development at SLAC (cost

reduction)

– Modulators meeting performance spec have been built and operated (at TTF) for the last decade.

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SLIDE 27

10-May-05 ILCSC 27

Klystron Development

THALUS CPI TOSHIBA 10MW 1.4ms Multibeam Klystrons ~650 for 500 GeV +650 for 1 TeV upgrade

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SLIDE 28

10-May-05 ILCSC 28

Tow ards the ILC Baseline Design

Not cost drivers But can be L performance bottlenecks Many challenges!

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SLIDE 29

10-May-05 ILCSC 29

Parameters of Positron Sources

rep rate # of bunches per pulse # of positrons per bunch # of positrons per pulse TESLA TDR 5 Hz 2820 2 · 1010 5.6 · 1013 NLC 120 Hz 192 0.75 · 1010 1.4 · 1012 SLC 120 Hz 1 5 · 1010 5 · 1010 DESY positron source 50 Hz 1 1.5 · 109 1.5 · 109

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SLIDE 30

10-May-05 ILCSC 30

Positron Source

  • Large amount of charge to produce
  • Three concepts:

– undulator-based (TESLA TDR baseline) – ‘conventional’ – laser Compton based

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SLIDE 31

10-May-05 ILCSC 31

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SLIDE 32

10-May-05 ILCSC 32

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SLIDE 33

10-May-05 ILCSC 33

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SLIDE 34

10-May-05 ILCSC 34

Straw man Final Focus

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SLIDE 35

10-May-05 ILCSC 35

What can the ILCSC do for the GDE?

– Help with staffing needs for the GDE – Work out a system for MOUs – Create a common fund – Bring detectors and machine onto common footing – Steps toward central authority, rather than regional authority