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Plans for ILC RF Unit Test Facility

Plans for ILC RF Unit Test Facility. Sergei Nagaitsev (Fermilab) Dec 4, 2006. Strategic goal: bring the ILC to the Fermilab site. Need to create state-of-the-art SCRF technology base at Fermilab Tight-loop cryomodule manufacturing and testing process

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Plans for ILC RF Unit Test Facility

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  1. Plans for ILC RF Unit Test Facility Sergei Nagaitsev (Fermilab) Dec 4, 2006

  2. Strategic goal: bring the ILC to the Fermilab site • Need to create state-of-the-art SCRF technology base at Fermilab • Tight-loop cryomodule manufacturing and testing process • Need to train personnel to be experts in linac construction, commissioning and operation • This can only be accomplished by “building” a large enough facility to create a critical mass of people on site • Focus on international collaborations to conduct critical ILC R&D and tests. • Need to educate students who will be building and operating the ILC in the future. Sergei Nagaitsev, Fermilab AAC 12/4/06

  3. Why ILC RF unit test? • ILC RF unit – 3 ILC-type cryomodules powered by a 10MW MBK • ILC S2 task force (string test) is about to issue its recommendations: • Cryomodule test facilities in all regions • Integration into an rf unit test with beam • Exchange of cryomodules between regions • Need to test all critical components in realistic operating conditions, prior to design freeze. The “realistic conditions” to consider include the following four: power, mechanical, thermal cycles, and radiation. • Several important changes to the TTF design are being planned for the ILC. These include a higher gradient, relocation of the quad, shortening of the cavity end-group, and a new tuner design. Also under discussion are different modulators, klystrons, cavity shapes, and other things. Sergei Nagaitsev, Fermilab AAC 12/4/06

  4. ILC rf unit test at NML • What is NML? • NML is an existing building at Fermilab (New Muon Lab) • NML building is part of Fermilab’s ILC Test Areas • Other areas are: MDB (horizontal SCRF cavity test stand), IB1 (vertical test stand) etc. • NML accelerator test facility is being developed as part of SCRF infrastructure at Fermilab. • The first NML user will be the ILC program. • The AARD portion may first piggy-back on the ILC program; will increase with time Sergei Nagaitsev, Fermilab AAC 12/4/06

  5. Location NML Sergei Nagaitsev, Fermilab AAC 12/4/06

  6. New Muon Building • Below-grade area is 72m x 18m. • Loading dock (NW corner): 12m x 7m 3 CM, about 38 m Loading dock Injector area Control room, offices Sergei Nagaitsev, Fermilab AAC 12/4/06

  7. NewMuon: South Side Sergei Nagaitsev, Fermilab AAC 12/4/06

  8. West side Sergei Nagaitsev, Fermilab AAC 12/4/06

  9. Facing north wall Sergei Nagaitsev, Fermilab AAC 12/4/06

  10. North side, loading dock Sergei Nagaitsev, Fermilab AAC 12/4/06

  11. ILC-like beam parameters • # Electrons/bunch 2×1010 • # bunches/train 2820 • Bunch rep. rate 3 MHz • Train rep. rate 5 Hz • Ave. current ~ 50 µA Sergei Nagaitsev, Fermilab AAC 12/4/06

  12. Why do we need beam at NML? • Cryomodule gradient calibration with beam energy spectrometer; there could easily be a 10% uncertainty in rf calibrations. • Need energy spectrometer upstream and downstream of CMs. • Many tests can be done at the Horizontal Test Stand. What is missing: • Beam loading effects; • HOM excitations; • Cavity alignment; • Check static and dynamic heat loads • Train Fermilab personnel by “doing” it. • Needs to be intellectually challenging • Exercises all support departments: controls, instrumentation, utilities, cryo, EE, RF, safety, operations, mechanical • Allows for a transition from Run 2. Needs at least 70 FTEs/year for 3 years to implement and operate. Sergei Nagaitsev, Fermilab AAC 12/4/06

  13. ILC Plans for NML 0. Use NML as a cryomodule test facility (must be able to replace CM’s quickly) 1. Demonstrate stable long-term high-gradient beam operation at ILC-like bunch parameters.2. While operating at high gradient and ILC-like beam currents, demonstrate a LLRF controls system such that the beam energy and beam phase stability meet the ILC specs.3. Evaluate effects of cavity gradient spreads, dark current, cryogenic load, radiation levels with beam operation.4. Measure beam kicks due to couplers, cavity tilt, quad rotations + tilt errors characterize focusing properties of SCRF cavities.5. Measure vibrations of cavities and quads.6. Test beam diagnostics. 7. Test ILC crab cavities. 8. Test the ILC installation procedure and tunnel layout. 9. May evolve into a near-final system integration test. Sergei Nagaitsev, Fermilab AAC 12/4/06

  14. A facility to test ILC baseline and alternative designs • Many groups in the US and world-wide are looking for a place to test their designs. • Need beam at 200-800 MeV, space to set up tests • Baseline design: • “Keep alive” positron source (ANL) • SC undulator (Cornell) • Crab-cavity (SLAC, Cockcroft Inst) • Alternative designs: • New HOM coupler design (MIT) Sergei Nagaitsev, Fermilab AAC 12/4/06

  15. Cryomodule delivery plans • 1st cryomodule is planned to be delivered to NML in July, 2007 • 2nd CM – summer 2008 • 3rd CM – Mid FY09 • Replace all three CMs with ILC Type 4+ in FY2010 Sergei Nagaitsev, Fermilab AAC 12/4/06

  16. Stage 1: a single cryomodule with beam • July, 2007: Cryomodule delivered by TD to NewMuon • First several months: cryo and rf system integration • RF system is supplied by FNAL; • Coupler conditioning (warm and cold) • Injector to supply beam installed in Apr. 2008 Sergei Nagaitsev, Fermilab AAC 12/4/06

  17. Experimental beam lines at NML Sergei Nagaitsev, Fermilab AAC 12/4/06

  18. Stage 2: two cryomodules (summer 2008) • Mid 2008 - two CM's, up to 500 MeV • Need a new 5-MW Klystron to run two CMs • Need a new rf system (modulator, pulse transformer, Klystron) for the rf gun Sergei Nagaitsev, Fermilab AAC 12/4/06

  19. Injector (see talks by P. Piot, M. Church) ~20 m Bunch compressor 1.3 GHz cavities rf gun 3.9 GHz TM010 Crab cavities 3.9 GHz TM110 OTR ILC CM BPM BPM BPM ICT OTR OTR OTR YaG YaG/OTR BPM BPM OTR Slit(s) OTR ICT Slit(s) OTR/CTR ICT Streak camera port quadrupole dipole Sergei Nagaitsev, Fermilab AAC 12/4/06

  20. Stage 3A: three cryomodules and building extension • Mid 2009 - three CM's, 750 MeV, 40 kW beam power • New 10-MW rf system supplied by SLAC (Marx?, MBK) • Construct a new building ~40m away from NML. Connect by a tunnel when schedule allows. Move loading dock. • ILC-like tunnel, space for 3 more cryomodules • New cryoplant Sergei Nagaitsev, Fermilab AAC 12/4/06

  21. Why building extension? • In principle, it is possible to fit 3 CMs and have a 10 m long injector. However, • Room only for one injector cavity. Must run far off-crest for bunch compression. • Energy too low, bunch parameters are not frozen, can not get 300 um rms bunch length, energy spread ~10% • No room for low-energy beam line, upstream instrumentation • More in Mike Church’s talk • The New Muon building is too short (72 m) for three cryomodules and a flexible injector needed for the R&D program. • No 300-um (or less) gaussian bunches • No crab-cavity tests • No room for high-energy tests (eg. “keep alive” positron source) Sergei Nagaitsev, Fermilab AAC 12/4/06

  22. Stage 3B: three cryomodules (try to fit everything into NML) • Mid 2009 - three CM's, 750 MeV, 40 kW beam power • Minimal injector Sergei Nagaitsev, Fermilab AAC 12/4/06

  23. Temporary cryogenics system Only “known” cryo losses are included. Dark current and static and dynamic heat leaks are not included in this table. This interim system does not meet the ILC temperature requirements. Sergei Nagaitsev, Fermilab AAC 12/4/06

  24. South wall, cryo installation (blue) Sergei Nagaitsev, Fermilab AAC 12/4/06

  25. New cryo plant at NML • Must be flexible to allow a wide range of heat loads, including 5-Hz operation • Must meet specifics of the ILC operating temperature levels of 2.0 K, 5 K, and 40-80 K • Requires a 15m x 25m building; the plan is to combine it with the NML extension. • Engineering studies complete, have a quotation. …Expensive Sergei Nagaitsev, Fermilab AAC 12/4/06

  26. AARD plans for NML • Fermilab wants to establish an AARD program at NML • Start parasitically first, increase portion with time. • Requires a flexible beam injector to support various beam parameters (emittance, bunch charge, bunch length) • Flexibility requires space • Requires building extension to provide a users area. • Money for extension will not come from the ILC. In fact, the GDE might argue that it will cause delays. • Will have to compete for funds against other projects at Fermilab. • See P. Piot’s talk for beam parameters and proposals. Sergei Nagaitsev, Fermilab AAC 12/4/06

  27. Summary • Fermilab plans to create the NML facility to test the ILC rf unit (3 CMs) with beam at ILC-like parameters. • Planning and engineering designs underway • Funding highly uncertain; with present funding projections will not meet the goal to have 1 rf unit with beam in FY09. • Building extension and new cryo plant highly desirable • Plans to use the NML for accelerator research and training; develop partnerships with NIU and other local universities. Collaborations with DESY and ANL. • Building extension required to make it a users facility with competitive and flexible beam parameters. Sergei Nagaitsev, Fermilab AAC 12/4/06

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