1057 SMTF Meeting at FNAL

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10/5-7 SMTF Meeting at FNAL

• SMTF organization
• Pier/Barry/Gerry encouraged SMTF to change from a
  multi-funded, multi-interest regional
  collaboration to a global group working on ILC
  cavity issues (perhaps merge with TTC so fewer
  meetings).
• ILC at FNAL 60 people, 40 FTEs, 75 engineers.
• Three working groups on cavities/cryomodules
• EP / handling cleaning / materials
• Very productive sessions with worlds experts.
  Allen Rowe and Christian Boffo (FNAL) and Mike
  Kelly (ANL) are leading this effort locally.
• Reached 52 MV/m in single cells at KEK with
  modest cleanliness.
• Cyromodule design / costs / schedule
• John Weisend and Tom Peterson made list of pros
  and cons for various layout options. Would take
  about 3 years to produce next generation
  cyromodule.
• CW plans and cryomodule beam tests
• Little CW attendance, beam tests emphasize low
  emittance studies.

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• FNAL/Cornell/JLab plans in FY06
• Using four recently acquired Accel cavities,
  perfect BCP at Cornell and then EP at JLab
  funded at 1 M.
• Run Capture Cavity 2 at Meson Building probably
  install in A0 afterwards.
• FNAL/ANL BCP process 4-8 cavities from AES and
  FNAL at ANL and vertical test at Cornell or JLab.
  May want to e-beam weld some cavities at SLAC.
• Begin construction of cryomodule at FNAL using 8
  dressed cavities and cryomodule parts from DESY
  (in exchange for 3.9 GHz cavities, which will not
  be completed in FY06). Test initially in Meson
  building (not enough shielding for several
  cryomodules).
• Begin design of a fourth generation cyromodule
  for ILC.
• With limited funds, will not move A0, build new
  gun/modulator/WG, install cryogenics in New Muon,
  build a vertical test stand nor build a second
  horizontal test stand. Open to SLAC building new
  rf gun.

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• FY05 accomplishments
• Close to having 4K capability in Meson Building.
• Installed and tested DESY LLRF electronics at A0
  will use with Capture Cavity 2 (considered a PD
  project as well).
• Most of parts ordered for the first horizontal
  test stand.
• Ordered a clean room.
• ANL BCP facility has all parts.
• Americanized DESY cryomodule drawings.
• Building two 5 ms pulse modulators (SLAC
  providing switches).
• Sent 5 people to TTF for beam/llrf studies.
• Other
• Accelerator / cryomodules at New Muon building
  will be called ILCTA.
• Meson building facility yet to be named
  (eventually PDTF).
• Proton Driver project no CD0 approval yet,
  working on cavity development as well.
• Nobu thought KEK would go global after Phase I
  of their STF program if other labs do.

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SLAC RD

• L-band Test Facility
• Electrical safety review of modulator this week.
• Klystron installed and magnet tested, llrf system
  well along, waveguide arriving, structure window
  being designed, and structure fabrication
  starting.
• Have plan to upgrade modulator to be able to run
  klystron (will work with LANL on this).
• Schedule
• Nov 14 Run modulator into a load (Dave Anderson
  from SNS will be here).
• Dec/Jan Upgrade modulator for higher current and
  test into load study arc response.
• Jan Run klystron without rf.
• Feb Run rf into a load test 10 m of
  pressurized waveguide and new window up to 4-5
  MW.
• March Power a 5 cell L-band cavity in NLCTA.

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L-Band Test Facility at NLCTA

• Recently acquired a 10 MW HVCM Modulator from
  SNS.
• Buying a 5 MW TH2104C tube from Thales (1 year
  delivery).
• In meantime use a SDI-Legacy tube from Titan
  (TH2104U).
• All major LLRF and waveguide components on order.

SNS Modulator Being Assembled at NLCTA
Thales 2104U Klystron
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Klystron WGLayout
The klystron will be installed in the unused half
of the Eight-Pack Modulator tank and waveguide
will be run into the NLCTA beam
enclosure. Expect first power in March 2006.
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• Coupler Program
• Brian working on specifics of a parts testing
  plan to examine effect of bellows, windows,
  coatings and bake temperature on processing
  speed.
• Jose looking at layout of test area in ESB
  propose to put a switch at klystron output.
  Coupler area would be used for initial klystron
  tests.
• SLAC has capability and equipment (high purity
  water, clean rooms, TiN coating facility) to
  assemble and process couplers for FNAL cavities,
  but so do other labs.
• Orsay for DESY TTF and XFEL couplers
• JLab (would convert 1.5 GHz test stand)
• FNAL (currently building setup for 3.9 GHz
  cavities).
• CPI (could at least assemble couplers)
• Will try to formulate global coupler plan at TTC
  meeting in December (first couplers needed in
  FY07).

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Test Facility Program in 2006

• Use 5 MW source for coupler and normal-conducting
  cavity tests.
• Propose to add a second L-band station using ILC
  prototypes.
• Based on progress, use Marx Generator, DTI Direct
  Switch or buy a baseline modulator from PPT.
• Either buy are borrow a CPI or Toshiba 10 MW
  klystron from DESY.

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Coupler Processing Studies
One concern is that the surface field variations
in the bellows and near the windows may lead to
excessive mulitpacting.
Coupler Surface Field
To understand processing limitations, plan in
FY06 to process coupler components individually.
In particular, determine if bellows or the
windows are the source of the long processing
time.
Brian Rusnak
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Instrumented Coupler Test Stand at Orsay
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• SC Quad and RF BPM
• Reviewed quad cryostat design with DESY (Heiner
  Brueck) and CIEMAT (Fernado Toral) last Friday.
• Current Plan
• Magnet tests nearly complete at DESY will ship
  magnet to SLAC afterward. Will also send lead
  package.
• Will not use CIEMAT He Vessel designed for 2K
  operation (no He vapor) with a cold bore. Need to
  increase He around inner bore and force flow.
• Widen connection to He reservoir and connect to
  bottom of tank to provide He bath.
• Review new design with FNAL experts at end of
  month.
• Parts ordered for He supply system at Magnet Test
  Lab.
• Aim for first cooldown in March.
• S-band RF BPM design complete (Zenghai / Gordon)
  and a triplet is currently being fabricated.
• Scheduled for test at ESA at end of February.
• Readout electronics being provided at ESA

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ILC Linac SC Quad/BPM Evaluation
S-Band BPM Design (36 mm ID, 126 mm OD)
Cos(2F) SC Quad ( 0.7 m long)
He Vessel
SC Coils
Iron Yoke Block
Al Cylinder
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