Transcript Slide 1

Industry and the ILC
B Barish
16-Aug-05
Why e+e- Collisions?
• elementary particles
• well-defined
– energy,
– angular momentum
• uses full COM energy
• produces particles
democratically
• can mostly fully
reconstruct events
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A Rich History as a Powerful Probe
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The Energy Frontier
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GLC
GLC/NLC Concept
• The main linacs operate at an
unloaded gradient of 65 MV/m,
beam-loaded to 50 MV/m.
• The rf systems for 500 GeV c.m.
consist of 4064 75 MW Periodic
Permanent Magnet (PPM)
klystrons arranged in groups of
8, followed by 2032 SLED-II rf
pulse compression systems
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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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Which Technology to Chose?
– Two alternate designs -- “warm” and “cold” had
come to the stage where the show stoppers had
been eliminated and the concepts were well
understood.
– A major step toward a new international machine
required uniting behind one technology, and then
working toward a unified global design based on
the recommended technology.
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Evaluate a Criteria Matrix
• A panel (ITRP) analyzed the technology choice
through studying a matrix having six general
categories with specific items under each:
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the scope and parameters specified by the ILCSC;
technical issues;
cost issues;
schedule issues;
physics operation issues;
and more general considerations that reflect the
impact of the LC on science, technology and society
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The Recommendation
• We recommend that the linear collider be based
on superconducting rf technology
– This recommendation is made with the
understanding that we are recommending a
technology, not a design. We expect the final design
to be developed by a team drawn from the combined
warm and cold linear collider communities, taking
full advantage of the experience and expertise of
both (from the Executive Summary).
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The Global Design Effort
– The Mission of the GDE
• Produce a design for the ILC that includes a
detailed design concept, performance
assessments, reliable international costing,
an industrialization plan , siting analysis, as
well as detector concepts and scope.
• Coordinate worldwide prioritized proposal
driven R & D efforts (to demonstrate and
improve the performance, reduce the costs,
attain the required reliability, etc.)
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Schedule
2005
2006
2007
2008
2009
2010
Global Design Effort
Baseline configuration
Reference Design
Project
LHC
Physics
Technical Design
ILC R&D Program
Bids to Host; Site Selection;
International Mgmt
Starting Point for the GDE
pre-accelerator
few GeV
source
KeV
damping
ring
few GeV
few GeV
bunch
compressor
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250-500 GeV
main linac
extraction
& dump
final focus
IP
collimation
Superconducting RF Main Linac
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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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Cost Breakdown by Subsystem
cryo operations
4%
4%
instrumentation
2%
controls
4%
cf
31%
vacuum
4%
Civil
magnets
6%
installation&test
7%
systems_eng
8%
rf
12%
structures
18%
SCRF Linac
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TESLA Cavity
~1m
9-cell 1.3GHz Niobium Cavity
Reference design: has not been modified in 10 years
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What Gradient to Choose?
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single-cell measurements (in nine-cell cavities)
Gradient
Results from
KEK-DESY
collaboration
must reduce
spread (need
more statistics)
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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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How Costs Scale with Gradient?
2
Relative Cost
alin
G
$
 bcryo
G
Q0
35MV/m is
close to
optimum
Japanese
are still
pushing
for 4045MV/m
30 MV/m
would give
safety
margin
C. Adolphsen (SLAC)
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Gradient MV/m
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Evolve the Cavities
Minor Enhancement
Low Loss Design
Modification to cavity shape
reduces peak B field. (A
small Hp/Eacc ratio around
35Oe/(MV/m) must be
designed).
This generally means a
smaller bore radius
Trade-offs (Electropolishing,
weak cell-to-cell coupling,
etc)
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KEK currently producing prototypes
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New Cavity Design
Re-entrant
28 cell Super-structure
More radical concepts potentially offer
greater benefits.
But require time and major new
infrastructure to develop.
single-cell achieved
45.7 MV/m Q0 ~1010
(Cornell)
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How and when to involve industry
• Large Scale Project Characterization
– Large Project Management
– Precision Engineering
– International Coordination
• Industrialization
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Civil Construction & Infrastructure
Cryogenics
Superconducting RF structures, couplers, etc
Electronics and Control Systems
Large Scale Computing
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