The bullet-point summary for the Magnet Working Group Meeting at LCFOA on 9/22/05 is as follows- * Attendees = FNAL (5), Everson Tesla (1), Vector Fields (1) * An overview of the various magnets thought to be required for the ILC was provided by David Harding and John Tompkins of FNAL. We noted that the magnets are roughly 6% of the preliminary ILC cost estimate. * The main magnet groups included are those in the Main Linac, the Damping Rings (or Dog-bones), and the Interaction Region. Much of the comments made by the FNAL folks were based on the DESY TTF Technical Design Review (http://tesla.desy.de/new_pages/TDR_CD) and the August 2005 ILC meeting at Snowmass. * About 1,000 S/C quadrupoles are required for Main Linac. The main concerns are the need for precise alignment, good stability, and low stray field (micro-tesla range) at the nearest SCRF cavity. The stray field measurements will be difficult and a simple empirical test to prove out performance without making these costly measurements every time is preferred and will likely require some R&D funding (perhaps during the Proton Driver development or elsewhere). These specifications may be more difficult to meet with the quadrupole in the middle of the cryomodule, as opposed to locating it in a separate cryostat. * The Damping Ring will contain hundreds of standard electromagnets, including dipoles, quadrupoles, sextupoles, and wiggler magnets. The 17km-long Dog-bone design contains more variations of these magnet types, whereas the 6km-diameter ring alternative design contains a number of groupings of magnets that vary only by length and may be manufactured more efficiently. The straight section of the Dog-bone is designed to be in the same tunnel as the Main Linac and offers that cost reduction. These magnets are somewhat similar to those used in the Main Injector Ring of FNAL's Tevatron accelerator, although the ILC versions are typically lower in field strength, but have tighter field quality specifications. There will definitely need to be scrutiny of the quality control process for these numerous magnets in the effort to reduce manufacturing costs. The issue of durability and MTBF was discussed and thought to be doable if the design, operating parameters, and utilities were carefully considered. * The Interaction Region may contain the biggest technical hurdles for the focusing magnets required for the small ILC beamline. Radiation effects may also be severe and rad-resistance must be designed into the magnets. Previous lessons learned at FNAL and elsewhere should be used. * The Who/What/Where/When of ILC magnet R&D should be considered, so these problems do not crop up late in the design. * If ILC R&D is delayed, then trying to get these questions answered via the Proton Driver work may suffice. * The ILC laboratories should look for ways to facilitate input from industrial members. * The ILC laboratories should let industrial members know if there are other ways for them to offer support. Please let me know if you have any questions. Best regards, Tom Myers Everson Tesla Inc. Regional Account Manager Mobile/VM: 651-494-4348 E-Mail: tmyers@eversontesla.com Website: www.eversontesla.com Main Office Phone: 610-746-1520 Main Office Fax: 610-746-1530 Tom's Fax: 651-423-9609 (call first)