Report from the GDE Barry Barish ACFA Workshop EXCO, Daegu, Korea 11-July-05 The

Report from the GDE Barry Barish ACFA Workshop EXCO, Daegu, Korea 11-July-05 The

Report from the GDE Barry Barish ACFA Workshop EXCO, Daegu, Korea 11-July-05 The

Thym, Jolene, Food and Wine Writer & Editor has reference to this Academic Journal, PHwiki organized this Journal Report from the GDE Barry Barish ACFA Workshop EXCO, Daegu, Korea 11-July-05 The Energy Frontier issued on Nov. 3, 2004 at the 9th Plenary ACFA In August 2004, ICFA has decided on superconducting technology as long as the future linear collider (LC), by endorsing the resolution of the international technology recommendation panel (ITRP) created by ILCSC under ICFA. The ITRP report emphasizes the importance of world-wide unified approach as a single team to design the international linear collider (ILC). ACFA has discussed various issues relating to ILC in the plenary meeting of ACFA at VECC, Kolkata in India on 2-3 Nov. 2004, in addition to ACFA came to the following conclusions ACFA welcomes the truly international nature of the decision on technology as long as the ILC. This sets the stage as long as international collaboration in the design ef as long as ts as long as the ILC. ACFA reaffirms that the ILC, the next major high-energy physics project, should be realized by world-wide ef as long as ts. In such International collaboration ACFA in addition to scientists in ACFA countries should play crucial in addition to leading roles. ACFA reconfirms the importance of hosting ILC in Asia, which will make high energy physics in addition to accelerator science truly global.

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ACFA urges the Japanese Government to fully support the ef as long as ts of KEK in addition to Japanese scientists to host the ILC in Japan. ACFA reconfirms that KEK is the best suited institute in Asia as long as hosting the Central Team of GDI. ACFA urges KEK to establish the Asian Regional Center as long as R&D in GDI in addition to encourages other Asian countries to actively participate in GDI. With ILC entering this important phase, ACFA urges Governments of Asian countries to support participation of their scientists in GDI. ACFA feels that Asia has wide expertise in accelerator technology which can be directed to develop SCRF technology required as long as the ILC, in addition to large trained manpower which can make major contributions to the ILC. Because ILC will pose major scientific in addition to technical challenges, there will be several technological fallouts. ACFA there as long as e feels that by participating in the ILC not only the scientific community of the participating country but also its industry will benefit. The Community then Self-Organized Nov 13-15, 2004 The First ILC Meeting at KEK There were 220 participants divided among 6 working groups Working Group 1: Overall Design Working Group 2: Main Linac Working Group 3: Injector, including damping rings Working Group 4: Beam Delivery Systems, including collimator, final focus, etc. Working Group 5: Cavity design: higher gradients, Working Group 6: Strategic communication Each working group had three convenors, one from each region

The Global Design Ef as long as t Formal organization begun at LCWS 05 at Stan as long as d in March 2005 when I became director of the GDE Technically Driven Schedule GDE – Near Term Plan Staff the GDE Administrative, Communications, Web staff Regional Directors (one per region) Engineering/Costing Engineer (one per region) Civil Engineer (one per region) Key Experts as long as the GDE design staff from the world community Fill in missing skills (later) Total staff size about 20 FTE (2005-2006) GDE – Near Term Plan Organize the ILC ef as long as t globally First Step — Appoint Regional Directors within the GDE who will serve as single points of contact as long as each region to coordinate the program in that region. (Gerry Dugan (North America), Fumihiko Takasaki (Asia), offered to Brian Foster (Europe)) Make Website, coordinate meetings, coordinate R&D programs, etc R&D Program Coordinate worldwide R & D ef as long as ts, in order to demonstrate in addition to improve the per as long as mance, reduce the costs, attain the required reliability, etc. (Proposal Driven to GDE)

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 Reference Design Report by end of 2006 Three volumes – 1) Reference Design Report; 2) Shorter glossy version as long as non-experts in addition to policy makers ; 3) Detector Concept Report Starting Point as long as the GDE Superconducting RF Main Linac Some Key Near-Term Design Choices Accelerating Gradient Positron Production mechanism Design of Damping ring Site-specific considerations: One or two tunnels Shallow or deep, etc Total cost will be a key determining factor in our ability to get the ILC built. There as long as e cost optimization of all systems is of primary importance

Towards the ILC Baseline Design Parameters as long as the ILC Ecm adjustable from 200 – 500 GeV Luminosity Ldt = 500 fb-1 in 4 years Ability to scan between 200 in addition to 500 GeV Energy stability in addition to precision below 0.1% Electron polarization of at least 80% The machine must be upgradeable to 1 TeV rf b in addition to s: L-b in addition to (TESLA) 1.3 GHz l = 3.7 cm S-b in addition to (SLAC linac) 2.856 GHz 1.7 cm C-b in addition to (JLC-C) 5.7 GHz 0.95 cm X-b in addition to (NLC/GLC) 11.4 GHz 0.42 cm (CLIC) 25-30 GHz 0.2 cm Accelerating structure size is dictated by wavelength of the rf accelerating wave. Wakefields related to structure size; thus so is the difficulty in controlling emittance growth in addition to final luminosity. Bunch spacing, train length related to rf frequency Damping ring design depends on bunch length, hence frequency Specific Machine Realizations Frequency dictates many of the design issues as long as LC

Cost Breakdown by Subsystem Civil SCRF Linac What Gradient to Choose TESLA Cavity 9-cell 1.3GHz Niobium Cavity Reference design: has not been modified in 10 years ~1m

(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 Electro-polishing Gradient Results from KEK-DESY collaboration must reduce spread (need more statistics) single-cell measurements (in nine-cell cavities) How Costs Scale with Gradient Relative Cost Gradient MV/m 35MV/m is close to optimum Japanese are still pushing as long as 40-45MV/m 30 MV/m would give safety margin C. Adolphsen (SLAC)

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) KEK currently producing prototypes New Cavity Design More radical concepts potentially offer greater benefits. But require time in addition to major new infrastructure to develop. 28 cell Super-structure Re-entrant single-cell achieved 45.7 MV/m Q0 ~1010 (Cornell) ILC Siting in addition to Civil Construction The design is intimately tied to the features of the site 1 tunnels or 2 tunnels Deep or shallow Laser straight linac or follow earth’s curvature in segments GDE ILC Design will be done to samples sites in the three regions North American sample site will be near Fermilab Japan in addition to Europe are to determine sample sites by the end of 2005

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Fermilab ILC Civil Program A Fermilab Civil Group is collaborating with SLAC Engineers in addition to soon with Japanese in addition to European engineers to develop methods of analyzing the siting issues in addition to comparing sites. The current ef as long as t is not intended to select a potential site, but rather to underst in addition to from the beginning how the features of sites will effect the design, per as long as mance in addition to cost Parameters of Positron Sources

B=0.75 T 5 mm gap Conventional source Undulator-based source Positron source Laser Compton Source

The Machine Accelerator baseline configuration will be determined in addition to documented (BCD) by the end of 2005 R&D program in addition to priorities determined (proposal driven) Baseline configuration will be the basis of a reference design done in 2006 The Detector(s) Determine features, scope: one vs two, etc (same time scale) Measure per as long as mance of the baseline design Beam delivery system in addition to machine detector interfaces Define in addition to motivate the future detector R&D program The GDE Plan

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