10 5 -7 SMTF Meeting at FNAL SMTF

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 FTE’s, 75% engineers. • Three working groups on cavities/cryomodules – EP / handling & cleaning / materials • Very productive sessions with world’s 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 pro’s and con’s 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.

• FNAL/Cornell/JLab plans in FY 06 – 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 A 0 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 FY 06). 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 A 0, 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.

• FY 05 accomplishments – Close to having 4 K capability in Meson Building. – Installed and tested DESY LLRF electronics at A 0 – 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 CD 0 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.

SLAC R&D • 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.

L-Band Test Facility at NLCTA • Recently acquired a 10 MW HVCM Modulator from SNS. • Buying a 5 MW TH 2104 C tube from Thales (1 year delivery). – In meantime use a SDI-Legacy tube from Titan (TH 2104 U). • All major LLRF and waveguide components on order. SNS Modulator Being Assembled at NLCTA Thales 2104 U Klystron

Klystron & WG Layout 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.

• 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, Ti. N 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 FY 07).

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.

Coupler Processing Studies Coupler Surface Field One concern is that the surface field variations in the bellows and near the windows may lead to excessive mulitpacting. To understand processing limitations, plan in FY 06 to process coupler components individually. In particular, determine if bellows or the windows are the source of the long processing time. Brian Rusnak

Instrumented Coupler Test Stand at Orsay

• 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 2 K 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

ILC Linac SC Quad/BPM Evaluation Cos(2 F) SC Quad (~ 0. 7 m long) S-Band BPM Design Field Map (36 mm ID, 126 mm OD) He Vessel SC Coils Iron Yoke Block Al Cylinder