2003 Structures Meetings

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


  • Week 12-25-03 and 1-1-04. No meeting. Merry Christmas and a Happy New Year!
  • Week 12-18-03. No meeting. Many attend ISG11.
  • Week 12-11-03. No meeting.
  • Week 12-04-03(Juwen -H60VG3S17-1 Ez measurement vs. theory + Tau comparisons for VG4/VG3 structures, Jim -S11 QC of H60VG4R17 Robertson cups, Zenghai -trapped mode study for H60VG4SL17A/B, Roger -damping of trapped mode in H60VG4SL17A/B at 15.4GHz)
  • Week 11-27-03. No meeting. Happy Thanksgiving!
  • Week 11-20-03 (Zenghai -Initial trapped mode study in H60VG4, Roger -Preliminary calc. of wake due to trapped mode, Zenghai- FP and HOM coupler S11 and design considerations)
  • Week 11-13-03 (Zenghai - Double mitered bend S11)
  • Week 11-06-03 (Juwen -Status of H60VG4S17-2 cells before/after etching, Valentin -peak field poisson simulation, Roger -Four fold interleaved H60VG4 with truncation: wake+beam dynamics, Nicoleta RDDS1 wire measurements)
  • Week 10-30-03 (Gordon/Juwen -Drawing of 6-cell structure for cold test of couplers, Nicoleta -Wire measurement of RDDS1, Chris -H60VG3S18 phase mismatch field HFSS simulation, Juwen -Structure evolution and nomenclature)
  • Week 10-23-03 (Juwen for Higo -Iris with burs, Zenghai -S11 of HOM H60VG4SL17A/B Couplers, Chris -H60VG3S18 phase mismatch field HFSS simulation, Valery - Power*sqrt(pulse width) processing for Cu and Mo structures)
  • Week 10-16-03 (Juwen - Overall schedule + 1988 "HDS" heavily damped structure, Jim -H60VG3S17 beadpull measurements)
  • Week 10-09-03 (Zenghai -Gradient comparison H60VG4SLA/B, Roger -Wake & beam dynamics for new Sech^1.5 ASSET 2-fold interleaved structures)
  • Week 10-02-03 (Juwen -Schedule, Jim -S11 of microwave ports to H60VG3S18, Roger -3D representations of Sech^1.5 vs. Gaussian distr. wake)
  • Week 9-25-03 (Juwen -Feeds to H60VG3, Roger -Sech vs Sech^1.5 distr. wake, Zenghai -first cut at geometrical parameters for Sech, Higo san, Morozumi san, Higashi san -KEK activities in structure modeling, fabrication and surface processing.). Dinner.
  • Week 9-18-03 (Zenghai -Final H60VG4 HOM coupler final design, Roger -H60VG4 Wake optimization including truncation for ASSET measurements)
  • Week 9-11-03 (Roger -1. Wakes of two-fold interleaved possible ASSET structures, 2 Alignment and frequency tolerances of 4-fold interleaved NLC H60VG3)
  • Week 9-04-03 (HOM Coupler -Gordon/Juwen)
  • Week 8-28-03 (Zhenghai -H60VG4S17 HOM Coupler S11)
  • Week 8-21-03. No meeting.
  • Week 8-14-03. Author on vacation. See group leader Juwen Wang if you need slides from this meeting.
  • Week 8-07-03 (Jim -H60VG3R17 tuning, Zenghai -H60VG4S17 coupler S11)
  • Week 7-31-03 (Chris -Final match H60VG4R17, Jim -Tuning H75VG4S18, Nicoleta -First wire measurement of DS2S)
  • Week 7-24-03 ( Valery -SW375 beam induced rf spectrum + antenna based structure phase measurement)
  • Week 7-17-03 (Jim -H60VG3R17 QC + Stack measurements)
  • Week 7-10-03 (Valery -Mistuned SW375 processing, Jim -H75VG4S18 Tuning, Zenghai -H75VG4 Waveguide + Fat lip coupler matchining & fields)
  • Week 7-03-03. No meeting. Lab SOS shutdown.
  • Week 6-26-03. No meeting. Many attend: US Machine Advisory Committee Meeting (MAC)
  • Week 6-19-03. No meeting. All attend: International Study Group (ISG 10)
  • Week 6-12-03 (Juwen -Conspectus of structures and analysis of phase change due to damage, Zenghai -Tapered H60VG3A17 with reduced surface field + highly truncated 1st dipole Kdn/df)
  • Week 6-05-03 (Rich Li - Omega3, Tau3 H60VG3 wakefield calc up to third dipole band, Juwen -analysis of phase bead pulls with vg, Roger - First band wake for H60VG3S17 with HOM S11 for H60VG3S17)
  • Week 5-29-03 (Juwen for Nicolay: Fermi version of H60VG3S17 Waveguide coupler matching, Jim -H60VG3S17-6C bead pull after NLCTA, Zhenghai -HOM coupler S11, Roger - Review 2-fold interleaving + new 4-fold interleaving + LR alignment tolerances)
  • Week 5-22-03 (Chris A.-High power measurement SW20a375 compared with Juwen's Cold test/labview simulation + general breakdown curves, Chris N. -H60VG3R17 coupler matching, Jim- systematic bead pulls after several months, Juwen -simulation of gradient vs. power, field reduction vs mistuning and temperature change)
  • Week 5-15-02. No meeting. Several attend PAC03
  • Week 5-8-03. No meeting.
  • Week 5-01-03 (Jim -H90VG3N bead-pulling + SW20a375 assembly microwave check)
  • Week 4-24-03 (Jim -H60VG3S18 final tuning, Roger -H60VG3S18 tuning simulation with circuit model, Roger -H60VG3S17 wake simulation)
  • Week 4-17-03 (Jim -H60VG3S18 intial tuning, Juwen -Fermi H60VG3S17 I/P coupler tuning, Roger -H60VG3 higher band wakes + H60VG3S17 influence of the removal of the upstream coupler on wake and manifold power radiated)
  • Week 4-10-03. No meeting. Many attend SLAC annual HEP program review
  • Week 4-03-03 (Zenghai - Cells for new 9.37% bandwidth structure, Roger - dipole band wakes + beam dynamics simulations for two-fold interleaved H60VG3S17 structure for ASSET testing, Roger M -Biperiodic structure Etravel/Eaccel derivation + discussion)
  • Week 3-27-03 (Juwen -Overhanging material/burrs in H60VG3S18, Jim -Final SW20a375 tuning, Roger -higher dipole band wakes + beam dynamics simulations for interleaved H60VG3A18 structures, Juwen/Zenghai - H60VG3A17 dispersion curves based on Roger J dipole parameters)
  • Week 3-20-03 (Jim -SW20a375 tuning, Roger -H60VG3A17 wake optimization, Nicoleta -SW2a0475 -Wire measurement+theory, Stefan -CERN W structure+dipole damping,Roger M -Bi-periodic Pi/2 mode choke damping concept)
  • Week 3-13-03 (Higo san -KEK Structures R&D + JLCTA, Higashi san -Surface studies + Machining design issues)
  • Week 3-06-03 (Dave/Juwen -Schedule, Chris -H75VG4 coupler matching, Juwen for Ivan & Nicolay -Fermi H75VG4 coupler matching design,Zenghai -H60VG3S17 design +Tor/PT BNS profiles, Roger -Higher band H60VG3 wakes, Valery -Pulse heating for Moly/Stainless steel)
  • Week 2-27-03 (Juwen -Etching away burrs from pie-shaped slots in H60VG3S18, Zenghai -H60VG3 a/lambda~.17,.165,.160 intial study + H90VG5 Stainless steel iris field reduction )
  • Week 2-20-03. No meeting.
  • Week 2-13-03 (Juwen -H60VG3S18 surface flatness, Jim -Beadpulls of Fermi FXB02, Roger -H60VG3 including latest HOM coupler ref co, Roger -Circuit model of pulse prop through H60VG3 incl. movies, Valery - Dependence of breakdown on power+pulse length)
  • Week 2-06-03 (Juwen -Al contamination on coupler plates/cleaning SW20a375, Jim -T53VG3MC phase measurements/data reinterpretation, Zenghai -First design HOM coupler, Valery/Roger - Movies of pulse prop H60VG3)
  • Week 1-30-03 (Jim -T53VG3MC Beadpull and pulse S11 + H90VG5 beadpull, Roger -H90VG3 & H60VG3 Wakes)
  • Week 1-23-03 (Higo+Juwen -H60VG3S18 single cell freq. measurements+ surface roughness, Roger -H90VG3 wake summary, Zenghai -accel efficiency as dipole freq changes, Nicoleta -wire/rod callibration summary)
  • Week 1-16-03 (Higo+Juwen -H60VG3S18 single cell + stack freq. measurements, Chris -H60VG3 matching design, Roger -H90VG3 3 fold interleaved optimized wake with single localized damping cell, Valery comparison of amp & phase of simulation/exp H60VG3 coupler)
  • Week 1-9-03 (Chris -NLCTA bend S11 + H60VG3 matching design, Roger -H90VG3 First cut at 3 fold interleaved optimized wake)


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

    R.M. Jones