2002 Structures Meetings

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


  • Week 12-26-02 and Week 1-2-03 No meeting. Merry Xmas and a Happy New Year for 2003!
  • Week 12-19-02 (Valery -Dark currents H60 and H90, Chris -H60VG3S matching cup design, Jim - H60VG3R Beadpull measurements)
  • Week 12-12-02. No meeting. Many attend ISG9
  • Week 12-5-02 (Jim -H60VG3N Beadpull tuning results)
  • Week 11-28-02. No meeting. Happy Thanksgiving!
  • Week 11-21-02 (Juwen -MC coupler, Perry -1.5 TeV design TW vs. SW, Nicoleta -DESY HOM measurements trip report)
  • Week 11-14-02 (Zenghai -H75VG4 a/lambda 0.18 vs 0.17, Roger -H75VG4 Wakefield damping with opt coupling + Beam dynamics)
  • Week 11-07-02. All attend MAC meeting. Note there was also a NLC Collaboration Meeting a few days afterwards.
  • Week 10-31-02 (Ron - Comments on breakdown features of a/lambda ~.18 vs .17, Dave -Global schedule, Valery - Dark currents in H60VG3, Zenghai -Structure studies incl. H75VG4, Roger -M100VG6 DDS wakes, M100VG6 choke mode options
  • Week 10-24-02 (Juwen - Long-range planning (2003),Valery - CAD choke pic, Zenghai -a/lambda ~0.17, 135 & 150 deg. comparison
  • Week 10-17-02 (Jim - H90VG3 beadpulls/tuning status,Chris -T53VG3MC (Operating at 92 MV/m) + H60VG3 breakdown update, Zenghai -Comparison of Es, Vg for H60VG3/DS1/H90VG5 + others)
  • Week 10-10-02 (Jim - H90VG3 beadpulls/QC status,Roger -Beam loading compension via pulse shaping, Roger -H90VG5 tolerances for optimized 3-fold interleaved,Chris -Designing a/lambda structure with low Vg)
  • Week 10-3-02 (Dave -Overall fabrication schedule, Zenghai -135 degree,a/lambda=0.17 structure, Valery -Pulse temp simulation I/P + coupler H60VG3 )
  • Week 9-26-02 (Frederic -Breakdown SEM of T53VG3R & T53VG3RA, Roger -Ramped pulse propagation through H60VG3, Nicoleta -Wire measurement progress)
  • Week 9-19-02 (Juwen -Coupler design at Fermi Lab, Chris -Review of several SLAC couplers, Cho -Pulse heating, Roger -Beam loading and energy minimization via pulse shaping, Roger M -Equations for minimizing energy spread due to dispersion, Nicoleta -Wire measurement progress)
  • Week 9-12-02 (Valery - T53MC breakdown, Jim -Phase measurement before and after high grad processing with systematic freq adjustment, Roger -Beam loading and energy spread along bunch train for H60VG3, Zenghai -135 degree structure + 1 meter structure)
  • Week 8-5-02. No meeting
  • Week 8-29-02 (Valery - Approx formulae for breakdown +PIC simulations, Jim -Phase measurement before and after high grad processing, Roger -Beam energy gain for H60VG3, Zenghai -135 degree structure)
  • Week 8-22-02. No meeting. Many attend LINAC2002
  • Week 8-15-02 (Roger -BBU + Emittance dilution for H60VG3, Nicoletta -Simulation of wire tilt, Roger M + Zenghai -135 degree structure)
  • Week 8-8-02 (Roger -Optimized H60VG3 Manifold damped "pie" slots + Interleaved Wakes, Nicoleta -Wire measure update, Valery -trapped modes in Chris N. coupler)
  • Week 8-1-02 (Jim -T53VG3RA Phase measurement, Roger - Single HDDS1 non-interleaved well damped!, Valery -Arnie's gun, Nicoleta -Wire measurement update)
  • Week 7-25-02 (Valery -SW565 + Arnie's gun freq sensitivity, Roger -Dispersion + pulse propagation thru H60VG3, Zenghai - 6 cells of pie slotted HDDS1, Nicoleta -Wire measurement update)
  • Week 7-18-02 (Juwen -Phase+S11+Smith chart T53VG3MC, Zenghai -Dispersion curves HDDS1 )
  • Week 7-11-02. No transparencies available
  • Week 7-04-02. National holiday, July 4th.
  • Week 6-20-02. All attend Fermi/KEK/SLAC collaboration meeting: ISG8
  • Week 6-20-02 (Valery -SW breakdown images + pulse heating, Jim -T53VG3MC time domain S11, Gordon- HDDS1 "pie" shaped slot, Roger -Limited local damping H60VG3, Nicoleta -Wire measurement initial exp.)
  • Week 6-13-02 (Transparencies not available)
  • Week 6-06-02 (Several attend EPAC2002 in Paris, France)
  • Week 5-30-02 (Juwen -Phase T53VG3RA, Valery -Pulse heating SW565 + field phase and ampl in T53VG3RA, Roger -H60VG3 alignment tolerance LR + SR wake imposed for 10% emittance growth)
  • Week 5-23-02 (Juwen -SW565 Gradient vs. power, Nicoleta -Wire measurement, Roger -SW fund mode freq. tolerances, SWPi20_565 wake, HDDS90VG3 wake)
  • Week 5-16-02 (Nicoleta -Single coupler S11, Zenghai -Pulse heating in (R)DDS, Valery -Choke mode SW)
  • Week 05-9-02 (No meeting - many attend FNAL/SLAC Collaboration workshop at FNAL)
  • Week 5-02-02 (Valery+Nicoleta+Nicolay -Coupler S11, Valery-Coupler slot pulse temp rise)
  • Week 4-25-02 (Nicoleta+Juwen+Roger - Coupler S11, Valery -Pulse heating + coupler discussion)
  • Week 4-18-02 (Cho + Nicoleta - H60VG3OUT Coupler S11, Valery -Pulse heating in I/P iris in H60VG3N coupler)
  • Week 4-11-02 (Cho + Nicoleta -Detailed coupled design S11, Roger+Valery -SW Wake, Ron+Juwen -Transient effects on breakdown)
  • Week 4-04-02 (Roger -HDDS1 Sum wake RMS and sigma for Gaussian vs. sech1.5 wake, Zenghai -Power density on slot edge, Valery -Detailed SW 3-band intial coupler-damped wake)
  • Week 3-28-02 (Roger -HDDS1 Gaussian vs. sech1.5 wake + upper band wakes, Valery -Detailed SW coupler-damped wake)
  • Week 3-21-02 (Roger -HDDS1 Sech^1.5 wake + results of optimisation code for coupling, Nicoleta -DESY trip report and Sept exp proposed on "superstructures", Valery -SW damping with emphasis on multi-band kick factors
  • Week 3-14-02 (Juwen -SWPIL Pair S11 & S21 measurment, Roger -BesselJ1(x)/x) wake + min at 4 zeros of envelope
  • Week 3-07-02 (Roger -Reduced bandwidth design for HDDS1, Valery -2D + initial 3D Const. Impedance SW damping)
  • Week 2-28-02 (Roger - HDDS1 reduced slot penetration wake, Roger -SW final tuning exp + impedance theory )
  • Week 2-21-02 (Chris N. - TM01 mode launcher coupler, Zenghai -SW20365 tuned field)
  • Week 2-14-02 (Rod -SW20565 final tune measurements, Zenghai -Cup indexing and lengths, Roger J. -SWPI tuning, Valery -surface field calc., Nicoleta -Wire measurement dispersion curves, Roger J. -Short range wake alignment tolerances)
  • Week 2-07-02 (No meeting - many attend the LC02 workshop at SLAC)
  • Week 1-31-02 In two sections (Session 1: Valery -SW high grad. measurements, Roger J./Juwen -SW20565a-II Levenberg-Marquardt χ2 tuning, Nicoleta -Wire measurement theory DS2S dispersion curves. Session 2: Roger J. -Extended session on wakes in H60DDSVG3)
  • Week 1-24-02. (Juwen -SW20565 tuning measurement. Mistuning correction will be reported next week. No transparencies available.)
  • Week 1-17-02 (Juwen /Rod -H60VG3R Tuning, Roger -H60DDSVG3 Deeper Slots + 4-Fold Interleaved Wake)
  • Week 1-10-02. (Juwen -wire measurement. Completed result to be discussed next week. No transparencies available for this week.)

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

    R.M. Jones