International Linear Collider Steering Committee (ILCSC)

The primary role of the Steering Committee is to promote the construction of an Electron-Positron Linear Collider through world-wide collaboration. In so doing the Committee will give particular attention to Outreach, Science, Technology and Organization of the LC project.

Mandate of the ILCSC

Purpose

1. The ILCSC, as a Sub-panel of ICFA, is established in order to facilitate a global support towards the realization of the International Linear Collider as a global collaborative effort, drawing on input from regional steering committees.

2. The ILCSC has established the Global Design Effort (GDE) Central Team to coordinate and direct the effort of the teams in Asia, Europe and the Americas that comprise the GDE. The ILCSC, representing ICFA, will provide oversight to the GDE.

3. The ILCSC will work closely with the Funding Agencies for Large Colliders (FALC) and/or other national or international agencies to facilitate the evolution of GDE to an institution under international governance aimed at the construction of the ILC.

Global Design Effort & Machine Advisory Committee

4. The GDE Director will be selected and appointed by the ILCSC with recommendations from the Regional Steering Committees. The GDE Director will directly report to the ILCSC and be responsible to the ILCSC for leading the GDE to fulfill its responsibilities.

5. The ILCSC will assess and endorse budget requests for the common operations fund of the Central Team that the GDE Director will put forward to Funding Agencies for Large Colliders (FALC) for approval.

6. The ILCSC will set up a Machine Advisory Committee (MAC) that will report to the Committee on ILC accelerator issues. The MAC Chairperson will be appointed by ILCSC. MAC members will be appointed by the ILCSC for two years with advice from the GDE Director.

7. The ILCSC will monitor the progress of the GDE activities, including through reports by the GDE Director and the assessment of technical progress through reports by the MAC Chairperson.

Worldwide Study

8. The Worldwide Study (WWS) will report regularly to the ILCSC and advise it on ILC physics and detector issues, while maintaining close contact with the GDE on the development of detector concepts and detector R&D.

9. The ILCSC will monitor the progress of the detector and machine detector interface development, including through reports by the co-chairpersons of the WWS and the Machine Detector Interface Committee (MDI).

Reporting to ICFA

10. The ILCSC Chairperson will report regularly the ILCSC assessment of the GDE progress to ICFA.

Outreach

11. The ILCSC will monitor ILC outreach activities of GDE, regional groups and others explaining the intrinsic scientific and technological importance of the project to the scientific community at large, to industry, to government officials and politicians, and to the general public.

Other Tasks

12. The ILCSC will carry out such other tasks as may be approved or directed by ICFA

Sub-committees

13. In carrying out its work, the ILCSC will appoint such subcommittees as needed, with members selected for their particular expertise. Membership will be chosen by consensus of the ILCSC.

14. ILCSC Membership

a) The members of the Committee will consist of the following:

i. Directors of the major particle physics related laboratories in the three regions that provide core support to ILC

ii. One representative each from the three regional steering groups

iii. One representative each from the physics community of the three regions

iv. Chairperson

v. One representative from Russia

vi. One representative from China

vii. One ICFA representative from the "Other Countries" category

There will be a Committee Secretary.

A representative of the FALC Resource Group will be invited to all ILCSC meetings

b) The Chair of the ILCSC will be chosen by ICFA and have a term of two years. The Chair position shall normally rotate among the regions in succession. The Chair should not be one of the “Directors” as defined in (i) above.

c) The members in category ii and iii are appointed by the regional steering committee for three year terms, renewable as appropriate.

Revision of Mandate

15. The mandate of the ILCSC shall be reviewed by ICFA every three years to determine if the purpose is being properly served and remains appropriate or if the activity should be terminated.

Current Membership of the ILCSC (1 March 2008)

Directors
CERN	Robert Aymar
DESY	Albrecht Wagner
Fermilab	Pier Oddone
KEK	Atsuto Suzuki
SLAC	Persis Drell

LC Steering Group Chairs
Asian	Won Namkung
European	Karlheinz Meier
N. American	Satoshi Ozaki

Other
Chair	Enzo Iarocci
China (IHEP Director)	Hesheng Chen
Russia (BINP Director)	Alexander Skrinsky
ICFA outside LC regions	Shih-Chang Lee
Asia Rep.	Sachio Komamiya
Europe Rep.	Francois Richard
N. American Rep.	Jim Brau

Secretary
Roy Rubinstein

Summary of the ILCSC Meeting

Barry Barish (GDE Director) described the Baseline Configuration Document (BCD), and the major decisions that had been taken in order to reach that consensus. He discussed how the BCD change control system will work, and the path from a 500 GeV to a 1 TeV machine. Barish commented on the process underway to produce a Reference Design Report (RDR), and said that the RDR, which will include costs, is scheduled for release in December 2006. The GDE reports to ILCSC, and in addition reports on resources to the Funding Agencies for a Linear Collider (FALC) and to the FALC Resource Group. The International Accelerator School for Linear Colliders (May 2006, Sokendai, Japan) had over five student applicants for each of the 80 available positions.

Barish said that the three Worldwide Study Co-chairs are members of the GDE, since there has to be good communication between accelerator designers and the detector collaborations, for example on the expensive shielding of detectors from muon backgrounds.

In order to increase communication, the Chair of FALC will be invited to ICFA meetings, and the ICFA and ILCSC Chairs will be invited to FALC meetings. The Chairs of ILCSC and FALC-RG will be invited to each other's meetings. ILCSC is responsible for the project and its technical aspects; FALC monitors the project so that the funding agencies are well informed.

The GDE now has a small common fund arranged by FALC and FALC-RG, with equal contributions from the three world regions.

Francois Richard reported that WWS detector R&D and machine/detector interface panels have been formed, and preparations are underway for writing a ~200 page Detector Conceptual Report. This report will be based on ~100 page reports from each of the four detector concepts. Part of the Detector Conceptual Report will be contained in the GDE RDR. The detector R&D panel has produced a status report; among its conclusions are that there is currently insufficient overall support, and early R&D is needed on challenging concepts. A first attempt has been made to identify missing R&D.

Barry Barish, the GDE Director, described the current GDE activities, including progress towards the Reference Design Report (RDR) A preliminary RDR will be released after the November 2006 GDE meeting, which will include costs (using the ITER "value" and CERN "core" models, with information on how to translate these into any country's cost system). The ILC R&D program includes the detector R&D needed to reach the combined accelerator/detector performance goals. Barry discussed the need for engineers, technicians, etc. currently based at labs around the world, to work on ILC items.

ILCSC set up a Machine Advisory Committee (MAC), chaired by Ferdinand Willeke (DESY) - see

MAC met for the first time in April 2006, and heard presentations by several GDE members. MAC produced a report, which was presented to ILCSC and also to GDE. A key question raised by MAC is how realistic is the main linac design accelerating gradient of 35 MV/m. MAC also questioned the extent to which cost considerations have influenced the design so far.

The Worldwide Study for ILC physics and detectors (WWS) outlined the needs for detector R&D funding over the next several years. ILCSC asked WWS to provide recommendations on detector R&D prioritization, and to name missing R&D items.

WWS is taking responsibility fot the Detector Concept Report which will accompany the RDR.

Barry Barish reported on present GDE activities. The GDE is on track to produce the Reference Design Report (RDR) by the end of 2006. The GDE now consists of ~62 people (~30 FTEs) coordinating ~350 people in labs around the world. Costing of the design is now under way, with strict cost disclosure rules. The 500 GeV BCD with "essentials" for 1 TeV will be costed, using ITER "Value" and the CERN "CORE" model; there will be information given on how to translate these to any individual country's costs. A 7-year construction phase is assumed. The cost will include the 1 TeV footprint, not 1 TeV tunnels; IR and BDS are scaled to 1 TeV, but some magnets will have to be added or replaced to reach 1 TeV; IR shielding and size is for 1 TeV.

Barry described the different costing methodologies (scaled TESLA, industrial studies, and in-house engineering). In the next few months, cost performance will be optimized, cost data validated, the cost-drivers within systems identified and studied, and a finite number of potential baseline changes selected. There will be many reviews before the November 2006 GDE meeting, with a draft of the RDR available then, and a glossy ILC report (coordinating RDR and Detector Concept Report (DCR)) ready for release in early 2007. The RDR will be ~250 pages; the DCR will be ~250 pages.

Barry has requested an independent cost review of the ILC design in early 2007. ILCSC felt that it should become involved in an international cost validation process, not to evaluate costs, but to study the methodology by which they are derived. A draft charge for such a review is under discussion.

Francois Richard discussed recent WWS activities. The first draft of the physics part of the DCR will be available in September 2006. The 4 detector concepts will be combined for the November 2006 GDE meeting, with only one averaged costing, including ongoing and still needed R&D. The DCR will cover why 2 IRs are needed, and the case for 1 TeV; options, such as g g , will only be lightly covered.

Regarding WWS-GDE interactions, a key issue is 2 IRs; also important is possible descoping of, for example, peak luminosity, positron polarization, maximum energy, muon spoilers, etc. There are now frequent meetings between BDS/MDI experts and the WWS co-chairs.

The timing of detector collaboration formation needs study, and the experience of the LHC detector collaborations will be a useful guide.

The ILC MAC met for the first time in April 2006; this meeting was short, with insufficient time available for breakout or closeout sessions. The next MAC meeting, in September 2006, will be longer and will have both breakout and closeout sessions.

An ILC Accelerator School was held in May 2006; the limited number of student openings was oversubscribed by a factor of more than five, showing the considerable interest in the ILC. Future ILC accelerator schools are in the planning stage.

In order to obtain a better understanding of the relation between ILC cost and performance, ILCSC decided to ask the Parameters Subcommittee (chaired by Rolf Heuer) to re-examine its 2003 report. Its new mandate should include a revisit of the Baseline Machine performance and Energy Upgrade parameters, taking into account possible new insights and developments and a discussion, together with the GDE, of all areas of the RDR design optimization affecting the performance parameters. The Subcommittee should revisit the options beyond the Baseline Machine it had established in 2003, and provide clear cost versus performance guidance as it affects the initial machine configuration.

Barry Barish reported that the final RDR design/cost document was reviewed at the Valencia GDE meeting. Following the Vancouver GDE meeting, the goal has been a 30% reduction in costs, which Barry believes will be achieved; there have been no big single reductions, only many 1% effects. Two 14 mr crossing angle interaction regions have been approved, as has a central injector system.

It is hoped to present publicly the RDR with preliminary costing following the ICFA meeting in Beijing on 8/9 February 2007. Barry described the several reviews that will be carried out following the RDR release, including an International Cost Review in Spring 2007 which will involve coordination by ILCSC, ICFA and FALC.

There is agreement that the first ILC School, held in Japan in May 2006, was very successful. ILCSC endorsed the proposal to hold a second School at Erice in September/October 2007.

Ferdinand Willeke, the Chair of the ILC Machine Advisory Committee (MAC), reviewed the conclusions of the MAC meeting held at KEK on 22-24 September 2006. Another MAC meeting will be held at the Cockcroft Institute, Daresbury, UK on 10-12 January 2007. It was agreed that the major agenda item would be the ILC cost and overall design, with specific MAC tasks:

      - Review the soundness of the overall RDR concept, identify any areas of concern,
         note what R&D is still needed, and comment on whether the performance
         parameters can be met.

The ILCSC Parameters Subcommittee (Paul Grannis, Rolf Heuer (Chair), Sachio Komamiya, Mark Oreglia, Francois Ricahrd and Dongchul Son) sent questions to the WWS physics working groups, mainly concerning their needs for integrated luminosity, energy, energy resolution, and positron polarization. The Subcommittee will soon update its 2003 "Parameters for the Linear Collider".

A discussion was initiated on how the ILC design organization should evolve following release of the RDR, in order to produce an Engineering Design Report in 2010.

Jim Brau reported on WWS activities, including the need for additional detector R&D funding, the joint GDE-WWS Machine-Detector Interface Panel, and the common work with GDE to study the physics impact of suggestions for reduction of ILC costs.

Summary of the ILCSC Meeting
12 January 2007
Cockcroft Institute, Daresbury, UK

There was a discussion of the 10-12 January 2007 MAC meeting, which had reviewed the preliminary ILC RDR with its cost estimate. Although MAC raised some detailed questions about the RDR, it approved of the overall cost methodology. The WWS commented on the proposal for two detectors in a push-pull arrangement with a common beam delivery system.

Plans were discussed for a press conference on 8 February 2007 in Beijing during the ICFA and ILCSC meetings there.

FALC (Funding Agencies for Large Colliders) has asked ILCSC to organize an international cost review of the RDR, to take place in the first half of 2007.

Summary of the ILCSC Meeting and the 55th Meeting of ICFA
8/9 February 2007
Beijing, China

The schedule of meetings held at IHEP, Beijing, was: 8 February morning, Joint ICFA and ILCSC; 8 February afternoon, ILCSC; 9 February, ICFA. There were no restrictions on which of the meetings members attended, and so one combined summary has been prepared for both committees. The reason for the joint meeting was preparation for the press release of the ILC Reference Design Report (RDR), which was held on 8 February.

As has become customary at the extended February ICFA meetings, directors of major world particle physics labs were invited to these meetings.

T Barry Barish gave a detailed report on the RDR and its value costing methodology. He noted that the detectors were not included in the cost. His report was preparatory to the public release of the RDR later on 8 February.

ICFA and ILCSC thanked Barry for leading the effort to reach this important milestone.

Following agreement on the press release to accompany the publication of the RDR, a press conference was held at which the RDR and the cost were described, and formally handed to ICFA and ILCSC by Barish.

Ferdinand Willeke, the MAC Chair, reported on the 10-12 January 2007 MAC meeting. Overall, MAC found that GDE had worked very hard, and had converted an originally performance driven design into one that was cost conscious without scope reduction. MAC agreed that the RDR cost estimate procedure is quite adequate. There was a GDE response to this MAC report.

ILCSC and the Funding Agencies for Large Colliders (FALC) have agreed that there should be an International Cost Review of the RDR, which ILCSC will organize. The current status is that this review will be held on 23-25 May 2007 at LAL/Orsay; members of the Review have been selected.

Francois Richard reported on progress towards producing the Detector Conceptual Report. Given the need for an Engineering Design Report (EDR) for 2 detectors in 2010-2011, there should be a selection of 2 detectors by the end of 2008. ILCSC supported the concept of an International Detector Advisory Group to unify efforts towards 2 detectors on this timescale, and requested that WWS produce by June 2007 a plan to lead to this.

There was a GDE proposal for how to get from the current ILC design status to an EDR; there is general agreement that FALC is not ready to become the unique GDE oversight body, and ILCSC will continue to be involved for some time into the future. GDE's proposal will be discussed again at the next ILCSC meeting.

ICFA heard reports from InterAction, FALC, ICFA Panels, and from the regions and labs represented at the meeting.

The GDE Director, Barry Barish, reviewed GDE activities. The most recent ILC cost figures are within a few % of those given earlier. The complete RDR will be presented to FALC in July 2007 and to ILCSC in August 2007. Barish noted that for the ILC detectors to develop Engineering Design Reports (EDRs) on the same time scale as that for the accelerator, selection of the two detectors is needed in 2008.

The current MOU for the GDE only covers the RDR phase, and a new one is needed for the EDR phase. ILCSC will produce a new MOU.

T The fourth and final Machine Advisory Committee (MAC) review of the ILC was held on 26/27 April 2007, and concentrated on the GDE R&D program. The MAC mandate, membership, and its four reports are available at

An International Cost Review of the GDE RDR was held on 23-25 May 2007. It was organized by ILCSC, and the Review membership was selected by FALC and ILCSC. Its mandate, membership and report are at

Hitoshi Yamamoto said that WWS would like there to be an ILC Research Director, appointed by, and reporting to, ILCSC, and also an International Detector Advisory Group (IDAG) which would review the experimental program and advise the Research Director. The Research Director would be a full-time appointment.

ILCSC set up a subcommittee to produce a charge for a Research Director, propose a candidate, and prepare a call for Letters of Intent for ILC detectors.

Proposed changes in the GDE organization for the EDR phase were described by Marc Ross. There will be a work package structure and interested institutions will take responsibility for the work package deliverables. The process will be led by Project Managers, who will be added to the GDE structure.

Barry Barish noted that a tehnically driven timeline could have ILC construction start in 2012. He described the project management organization needed in order to produce an Engineering Design Report (EDR) in 2010. Barish noted that the detectors need to be on the same timescale as the accelerator.

Marc Ross described the GDE's plans for the EDR phase, including resources, staffing and schedule. He gave details of the Work Package structure needed for the activities, and the MOUs required between the GDE and the institutions carrying out the work. ILCSC agreed to the EDR phase plan.

The GDE will set up an Accelerator Advisory Board, composed of both GDE members and outside advisors. It will meet approximately monthly, and report to GDE. In addition, ILCSC will form a new MAC, which will provide a review of ILC accelerator activities for ILCSC and the outside community.

The WWS report was given by Hitoshi Yamamoto. He said that in order for the detector design and construction to be in synchronism with that of the accelerator (so data taking can start as the accelerator is ready), the following detector schedule is proposed:

Yamamoto discussed the need for an ILC Research Director (RD), who would be responsible for the development of the experimental program of the ILC. The RD would be helped by an International Detector Advisory Group (IDAG).

ILCSC agreed to appoint a Research Director, and to issue a call for LOIs for ILC detectors.

Barry Barish described the 4 volumes of the ILC Reference Design Report; "Gateway to the Quantum Universe" will be translated into 8 languages. The timescale for Engineering Design Report (EDR) completion is July 2010. The current GDE membership is Asia 101, Europe 133, Americas 233.

GDE is setting up an Accelerator Advisory Panel (AAP), and a mandate for AAP has been written. It will be composed of ~10 people, and will meet on a weekly schedule, with more complete reviews ~every month. AAP's role will include study of alternatives to major components, and also study of R&D issues.

Marc Ross presented the ILC Project Management Plan for the EDR phase. The EDR planning phase will last until March 2008 (describing milestones, interim deliverables, and deliverables), and will produce an EDR schedule; it will be succeeded by the Implementation Plan. The EDR goals will be consistent with a construction start in ~2012. One milestone is to have a cavity gradient recommendation in 2009.

Many of the past activities of WWS have now been taken over by the Research Director, reported Hitoshi Yamamoto, and its future role is under discussion. It will continue to organize LCWS; it might continue as an ILC users' group, and might continue outreach to the public and to the scientific community.

The recently appointed Research Director, Sakue Yamada, said that the 3 WWW co-chairs will temporarily serve as regional contacts representing the ILC physics community in each region. He noted that the two detector groups selected in 2008 may not be those ultimately performing the experiments, as room must be left for new developments. He expected detector R&D to continue until ~2010.

Yamada discussed the International Detector Advisory Group (IDAG), for which he hopes to have a member list by the end of 2007. IDAG will produce benchmarks (which are needed soon) for the LOI proposals. If there are more than two LOIs submitted, IDAG will make a recommendation on which two should be encouraged to proceed to the EDR stage.

ILCSC members noted the importance of the two selected ILC detectors being complementary and dissimilar.

The PAC, consisting of ~9 members, will assist the ILCSC in its oversight of the ILC project. It will be complementary to the GDE's AAP on the accelerator side, and its oversight functions will include the review of detector activities, especially detector integration with the accelerator. Membership of the PAC is currently under consideration, and ILCSC approved a mandate for the committee.

Barry Barish described the GDE replanning, following the recent UK and US funding actions. He noted the offers of help through visiting appointments, travel, etc., and that there is no evidence of a "domino effect" following the UK and US actions.

The new GDE plan is more focussed, with strict prioritization and a stretched-out schedule, and involves close collaboration with the XFEL; there will be coordination with CLIC on common aspects, such as positron source, damping rings, beam delivery system, detectors, etc. The first Technical Design Phase will last until 2010, while the second phase continues to 2012.

The ILC Research Director, Sakue Yamada, reported that a detector Directorate has been formed, consisting of himself and 3 regional contacts; these regional contacts will initially be the 3 WWS Co-Chairs Jim Brau, Francois Richard and Hitoshi Yamamoto.

Following the recent UK and US funding actions, there is a new detector timeline, which will be in synchrony with that of the GDE. Expressions of Interest (EOIs) will be requested by March 2008, and Letters of Intent (LOIs) by March 2009. Following that, the LOIs will be validated by the International Detector Advisory Group (IDAG), but the selection of 2 detectors will not occur at that time. The validation will be to determine if a detector is capable of the desired physics, and whether the proposing group is strong enough to carry it out.

Francois Richard discussed how the recent UK and US funding actions affected the individual detector collaborations. He noted that future linear collider detector workshops will extend to CLIC issues.

Membership of the PAC was approved. This committee will review GDE accelerator activities and, in addition, the ILC detector activities. Its mandate is given in