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Assorted VTS News Items

Assorted VTS News Items. Project subtasks: Aseet Mukherjee is designing a thermometry system for 9-cell cavities R&D stage Currently planning cryo test of cheaper thermometers in ICB (with help from E. Barzi) Andrei Lunin has preliminary RF design for a VTS input coupler

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Assorted VTS News Items

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  1. Assorted VTS News Items • Project subtasks: • Aseet Mukherjee is designing a thermometry system for 9-cell cavities • R&D stage • Currently planning cryo test of cheaper thermometers in ICB (with help from E. Barzi) • Andrei Lunin has preliminary RF design for a VTS input coupler • Will prepare some plots showing operational range in terms of measurement quantities • Valeri Poloubotko will design the radiation shielding lid/movement • Communications with management • VTS project progress report for GDE to be submitted today • Only approved tasks appear • Completed tasks FY06, and plans for remainder FY06 and FY07 • Proposal for two additional VTS’s (>FY07) in preparation (R. Kephart et al.) • VTS update to ILC/SRF R&D meeting Thursday August 3 • Plan for MOU addendum with JLab for Tom Powers’ time on RF commissioning • Plan for electronic logbook (M. Votava) meeting today at 2 pm C.M.Ginsburg VTS Group Mtg

  2. Update of ILC/FNAL RF responsibilities NB: Ralph Pasquinelli is overall responsible person for ILC/FNAL RF Generally: AD is responsible for RF outside the cryostat; TD is responsible for RF inside (cables, input couplers, etc.) C.M.Ginsburg VTS Group Mtg

  3. RF System Design Review • Charge to the committee • Assess and comment on all technical aspects of the IB1 VTS RF system design, and • Provide a written report.  • Committee members: Ralph Pasquinelli (chair), Jim Steimel, Brian Chase, Chuck Worel, John Reid, Wolf-Dietrich Moeller • Time/date/location/deadlines • Thursday, August 24, 8:30-12:30 • IB1 Mezzanine conference room • Background materials to committee by August 17 C.M.Ginsburg VTS Group Mtg

  4. VLCW06 News: Gradient task force Charge to the committee • The RDB is asked to set up a task force to carry out a closely coordinated global execution of the work leading to the achievement of the accelerating gradient specified in the ILC Baseline (BCD) • A definition of the goals for the cavity performance in terms of gradient and yield and a plan for achieving them should be proposed by this group, which should take account of the global resources available and how they may be used most rapidly and efficiently. • The accelerating gradient performance and yield should be specified both for an individual 9-cell cavity and for an individual cryomodule, and the plan should cover the demonstration of this performance in both cases. • The GDE will facilitate the coordination at the global level to achieve this vital goal asap. • Members: Hitoshi Hayano, Toshiyasu Higo, Lutz Lilje, John Mammosser, Hasan Padamsee, Marc Ross, Kenji Saito C.M.Ginsburg VTS Group Mtg

  5. VLCW06 News: Gradient task force • Make tests more reproducible among labs • Define tests needed on 9-cells • complete documentation of prep/test process • develop common set of parameters • results more comparable • Synchronize efforts globally • model of international coordination of R&D efforts • distribute work load C.M.Ginsburg VTS Group Mtg

  6. VLCW06 News: Gradient task force • Stage 1 “Tight-loop” (finish mid-2007) • Start with 20 cavities globally. Carry out the full treatment once • Pick out the best 9 cavities and distribute 3 per location. These 9 cavities have a starting average gradient and spread. • Show reproducibility of “final process” with 3 best cavities at each location by using the tight-loop EP 20um/HPR/test. # cavities x 3 cycles = 9 tests per location • Determine spread and best gradient for final treatment process • Stage 2 “improved tight-loop” (finish mid 2008) • Include improvements from the parallel/coupled R&D program • Repeat the first stage with the same 9 cavities, get smaller spread with higher gradient • Stage 3 “Production Like” (start 06) • Order a large number of cavities starting asap in 06/07 • According to first assessment, total number of cavities in hand by end of 2007 could be ~50-60 • Stage 4 “Final Production” (finish mid-2009) • Carry out full treatment. Apply best recipe from stage 2 to large batch of cavities C.M.Ginsburg VTS Group Mtg

  7. VLCW06 News: Gradient task force (Preliminary) set of common tests for 9-cells • Check for hydrogen contamination of the niobium material (Q-disease) • Stay at 100K for 8 hours during cooldown, cool down curve should be provided • As this test significantly extends the testing time for some labs, may be omitted after confidence has been gained, that the processes do not contaminate the niobium with hydrogen. • Common Q(T) measurement field level: about 1 MV/m for residual resistance measurement • p mode as a standard decision on the data, but all 9 passband modes have to be measured in order to interpret this right • information of the field flatness has to be added (known); some times we see results, hard to understand and not to explain with the bad field flatness • Help to localize the problem -    Checks of fundamental mode spectrum for possible detuning of the field flatness (instead of bead-pull) • Deformation in field flatness would lead to a unusable information from the passband modes measurement (if the field flatness is known, it could be recalculated) • Further information to be provided with the data above include: • Continuous pumping during test or closed cavity vacuum valve • If closed, pressure before closing valve •     Cooldown speed • Temperature difference over cavity during cooldown • Method of low-power processing if necessary • pulsed or cw • Coupler type (fixed or variable) • Recorded quantities: Eacc, Qo, Qext, Qtrans, Qhom, Pfor, Prefl, Ptrans, Phom, Beta, frequency, He bath temperature, X-ray flux, Comments C.M.Ginsburg VTS Group Mtg

  8. RF Design Review Proposed Agenda For discussion • Introduction to VTS (Camille) [15 mins] • Introduction to the team members • Project scope/progress/plans (copy/update talk from July 6 ILC/SRF meeting) • Infrastructure (Cosmore) [15 mins] • Proposed instrumentation rack location, assembly area, etc. • Drawings with shielding location and movement (as known) • Technical parameters of the measurements (Joe) [30 mins] • Test plans, testing capacity (including cryo capacity) • Pages 1-5 of May 12 talk, with emphasis on what is measured, and why. (motivate the design) • Required frequency range, phase and amplitude stability, input power step size • Some data from JLab or DESY of measurement ranges, as available/relevant • RF System Engineering Design (Tom) [45 mins] • Schematics • Data acquisition and control • RF System Implementation plans (Joe/Ruben) [30 mins] • Instrumentation list • Summary/status of purchases • Project tasks/milestones/resources/schedule C.M.Ginsburg VTS Group Mtg

  9. RF Design Background Materials • Test plans, testing capacity C.M.Ginsburg VTS Group Mtg

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