3-4 April 2013
KEK, Building-2, the 1st floor
Asia/Tokyo timezone
Dear ATF2 Review Committee Members and Contributors
Many thanks for your kindest cooperation and contribution to the 
ATF2 Technical Review organized by ILC-GDE and held at KEK, April 3- 4, 2013. 
We have been very pleased to hear that the review went well with many presentations 
well prepared and with very productive discussion between reviewers and presenters/audience. 
We also very much appreciate the closing summary by the Chair, Nick, and 
we may expect the review report to be given within a few weeks. 
We would thank again for everyone's cooperation. 
With our best regards, 
Akira Yamamoto for the review organizers  
Akira Yamamoto

With the achievement of the milestone 70 nm vertical beam size in the recent December run, we believe that now is a good opportunity to take stock of the project and its goals. The review itself will be comprehensive and focused on both the status of the project and the next steps which need to be taken to achieve the as yet unachieved published ILC Technical Design Phase goals (37 nm vertical beam size, stabilisation). Furthermore, the importance of the ATF2 programme for ILC was acknowledge in the recent PAC TDR technical review. In particular the PAC report noted that “The lack of progress towards the 37 nm ATF2 IP goal is a concern. Several issues have already been resolved, and the currently scheduled modifications should lead to significant progress towards the goal.” This review is primarily to address this observation.
Specifically, the goals of the review are to:
  1. evaluate and comment on progress made toward achieving the stated goals;
  2. assess the current readiness of the ATF/ATF2 complex toward achieving the goals, including, for example, understanding of beam dynamics and expected instrumentation performance;
  3. comment on lessons-learned at the ATF/ATF2 for the ILC complex and how these may be included in the ILC design;
  4. discuss future plans and set milestones for the short and medium term towards achieving the ILC goals.
With the ILC goals in mind, the types of questions we will endeavour to answer are:
  ·    Is the ATF2 machine well understood in terms of its accelerator performance
        (requirements,   tolerances, tuning algorithms, diagnostics)?
  ·    Does the ATF routinely provide a stable low-emittance beam to allow ATF2 tuning
        to proceed in an efficient manner?
  ·    Given the current status and knowledge of the ATF2 hardware, what are the major
        challenges and possible hurdles to achieving 37 nm?
  ·    What are the exact plans for demonstrating ‘stability’ and how will they be implemented?
  ·    Given the answer to the above, what hardware upgrades (if any) need to  be considered to
        mitigate identified problems which are limiting performance?
  ·    If the above upgrades or modifications are not practical, what is the realistic performance
        expectations from ATF2?
  ·    What are the KEK management’s plans and schedule for ATF2 to facilitate a successfully
        conclusion to this part of the programme? How will the broader international collaboration
        interact with these plans to achieve them?
KEK, Building-2, the 1st floor
Large meeting room
1-1 Oho, Tsukuba, Ibaraki 305-0801 Japan
Local Organizers in contact: Akira Yamamoto (e-mail: akira.yamamoto@kek.jp) - cell-phone: +81903428-7385 Tomiko Shirakata (e-mail: tomiko.shirakata@kek.jp) - phs: 029-864-5200-tone-4401