2004 Structures Meetings

These meetings are organised on a weekly basis and are chaired by the group leader Juwen Wang.


  • Week 12-23-04. No meeting. Merry Christmas and a Happy New Year!
  • Week 12-16-2004. Group discussion of warm L-band positron-capture linac.
  • Week 12-09-04 (Vinod - simulations of heat load in positron accelerator using fluka, Jose - cell cooling in positron linac, Zenghai - review of PAC03 talk on X-band BPM and on the potential use in L-band structures)
  • Week 12-02-04 (Vinod - Comments on in-progress fluka simulations of heat load in positron accelerator, Juwen - temperature rise in positron linac, Gordon -mechanical design of a cell in a positron linac)
  • Week 11-25-04. No meeting. Happy Thanksgiving!
  • Week 11-18-04 (Juwen -RF structures for positron source, Roger J.- Cross-coupling of horizontal and vertical motion in the main linacs of the ILC due to HOM degeneracy + further directions for HOM studies)
  • Week 11-11-04. No meeting. Many attend ILC Workshop at KEK
  • Week 11-04-04 (Chris A -ASSET 2004 + Modes of Marc Ross's TTF2 measurement of L-Band Cavities, Juwen - ILC Positron capture linacs, Vinod -Heat load due to particle loss in the positron accelerator)
  • Week 10-28-04. No meeting.
  • Week 10-21-04. No meeting. Mandatory safety meetings.
  • Week 10-14-04. No meeting. All attend ILC-Americas Workshop
  • Week 10-07-04 (Steffen -ASSET 2004 HOM signals from H60VG4SL17A+B, Zenghai -surface magnetic field vs phase advance for TESLA-like cells, Roger J - ASSET 2004 wake and beam dynamics, Roger J. -review of TESLA beam based alignment, Mark R. -Review of Martin Dohlus's simulations on HOM couplers)
  • Week 9-30-04 (Roger M. - Analysis of the modes of Vaguine-type structure, Juwen -Review of proposed TW superconducting accelerators and comparison with SLAC 'leap frog' program)
  • Week 9-23-04. No meeting.
  • Week 9-16-04 (Roger J. -Wake for upcoming ASSET exp., Roger M. - Freq. dependence of RF cavity multipole monitors, Valery -Magnetic field calc for Vaguine-type structure.)
  • Week 9-09-04 (Juwen -Port attachments for upcoming ASSET exp.)
  • Week 9-02-04 (Jim - S11 bead pull of 'ASSET ready' H60VG4SL17A/B, Juwen -plans for future work on ILC, Roger M. -Future SRF R&D)
  • Week 8-26-04. No meeting.
  • Week 8-19-04. No meeting. Many attend LINAC2004.
  • Special meeting. Pictures to celebrate Roger Miller's 45 years of inspirational research at SLAC. Week-8-12-04 (Roger -TESLA BBU + alignment tolerances)
  • Week 8-5-04. No meeting.
  • Week 7-29-04 (Juwen/Jim/Zenghai -H60VG4SL17 cup QC, Roger -H60VG4SL17A/B wakefield with removed I/P fundamental mode coupler loading dipole modes, Liling -S3P HOM load simulation)
  • Week 7-22-04 (Zenghai/Juwen -H60VG4SL17 cup QC,Jose/Zhenghai/Juwen -HOM feed through termination, Roger J. -H60VG4SL17A/B wakefield simulation + manifold radiation/cell to freq. mapping, Roger M. -Coupling between horizontal and vertical wakefields)
  • Week 7-15-04 (Jose -HOM Ceradyn loads, Liling -Initial S3P simulation VSWR of wedge load, Sami -Int. J. Elec. paper on loads)
  • Week 7-8-04 (Discussion on higher order mode loads)
  • Week 7-1-04 (Roger -GLC/NLC and TESLA emittance-imposed frequency tolerances)
  • Week 6-24-04. Major planning -special meetings. Further details Here!
  • Week 6-17-04. No meeting.
  • Week 6-10-04 (Juwen for Nikolay/FNAL 4-slot output coupler HFSS calc of modes, Zenghai -Compact 'fat lip' output fundamental coupler)
  • Week 6-3-04. No meeting.
  • Week 5-27-04(Juwen -Trapped mode study overview, Roger -H60VG4S17-II-SN2 trapped mode study summary + influence on beam dynamics, Roger -Trapped mode movies here!)
  • Week 5-20-04(Jim -H60VG4S17-III{SN2} tuning, Roger -H60VG4S17-III trapped mode dipole kick factors and mode identification, Sami for Alexej -Optimized H60 X-band short pulse structure with 50MV/m loaded gradient)
  • Week 5-13-04(Roger -NLC baseline design wake + structure and sub-structure tolerances, Zenghai/Roger M. -Magnetic coupling between cells gives >100C pulse temp rise, Juwen for Alexej -Optimized H60 X-band short pulse structure with 55MV/m loaded gradient)
  • Week 5-06-04(Jim -H60VG4S17-III + FNAL FXB006/7 S11 measurement, Roger -H60VG4S17-III measurement vs. HFSS calc. of trapped modes, Zenghai/Roger M. -Initial explorations of magnetic coupling between cells )
  • Week 4-29-04(Juwen -Schedule)
  • Week 4-22-04(Roger -Impact of Nikolay/FNAL inline load on beam dynamics, Roger -revisit of RDDS1 wakes, Karl -Dark current simulations)
  • Week 4-15-04(Jim -H60VG4S17-III-SN1 tuning, Roger -Impact of trapped mode on beam emittance, Zenghai/Roger M. - 'HRDDS' Cavity optimization)
  • Week 4-8-04. No meeting.
  • Week 4-1-04(Karl -Dark current simulation)
  • Week 3-25-04(Jim - Fundamental mode coupler trapped modes [PPT], Roger -HFSS + spectral function modeling of H60VG4SL-A O/P trapped mode with smaller width wgde, Zenghai/Roger M. -Details of tool-cutting of cavity, Karl -Dark current simulation)
  • Week 3-18-04(Roger -Trapped mode HFSS + spectral code analysis, Jim -8 pack S11 measurement, Zenghai+Roger M. - Leek head detailed design, Gordon - Design of strongback with 4 structures on it)
  • Week 3-11-04 (Jim S11 measurement of 8 pack, Roger - Two interleaved structures incl. random errors, Roger M + Zenghai - Leek head design with improved Q, Karl -Dark current simulations with Mathematica code)
  • Week 3-04-04 (Roger - Reoptimized bandwidth for H60VG4S17 with no I/P HOM coupler, Valery/Roger -HFSS modeling of trapped mode in I/P + O/P coupler, Karl -Dark current simulations with electrons returning to point of origin)
  • Week 2-26-04 (Roger - H60VG4S17 effect of I/P HOM coupler random phases, Juwen -cold test of S11 of H60VG4 HOM coupler, Zenghai -shifting freq of trapped mode in O/P coupler of H60VG4 + leak-head Q,Jim -H60VG3R17 S11 measurement prior to and installed in 8-pack)
  • Week 2-19-04 (Roger - H60VG4S17 effect of I/P HOM coupler removal, Juwen -H60VG4 HOM coupler cold test, Valery -Breakdown kick imparted to beam)
  • Week 2-12-04 (Valery HFSS trapped mode study, Roger -HFSS + Spectral Function trapped mode study, Zenghai -Leek head Q, Karl -Dark current simulations)
  • Week 2-05-04 (Karl -Dark current simulations, Zenghai -Leek head cavities manufacturing considerations)
  • Week 1-29-04 (Juwen -Burrs in structures, Nicoleta -Wire measurement RDDS1 report)
  • Week 1-22-04 (Juwen -Schedule, Chris A./Stefan -H60VG4S17-1 1 breakdown in 40 hrs = Success!, Jim - H60VG4R17_2 tuning, Juwen -RF loss theory vs exp for H60/H75 structures, Nicoleta -Wire summary/prospects, Valery -Dark current 'magic' simulation: here)
  • Week 1-15-04 (Jim -H60VG4R17_2 Bead pull measurement, Zenghai -New "leek head" cells with single manifold slot + H60VG4S17 trapped mode study)
  • Week 1-8-04. No meeting.
  • Week 1-1-04. No meeting. Happy New Year!


  • All the above meetings are archived in Adobe "PDF" format unless otherwise indicated. The suffix "PPT" refers to Microsoft powerpoint.

    R.M. Jones

    Last updated 20th-December-2004.