Status and Plans for SRF Facility

1. Status and Plans for SRF Facility Sergei Nagaitsev May 18, 2007

2. Setting the Scale • For ILC: produce 4 to 6 cryomodules in the next 4 years • ~ 50 cavities used; • additional needed for development and testing • International (ILC/GDE) coordination: • S0 ‘tight loop’ task force: • Process and re-process the inside surface of a limited number of cavities, repeatedly, testing each time… (~100 procedures/year for several years) • Answers due 08, 09  guidance for a final gradient recommendation • S1 ‘cryomodule’ task force : • 31.5 MV/m OPERATING cryomodule • S2 ‘string test’ task force : • Put it all together • Run ILC-like beam • Various critical tasks S. Nagaitsev

3. SCRF Cavity Gradient RD • “S0 / S1” • GDE charge: Provide the information needed to make a gradient decision for TDR. • Challenge: Cavity surface processing variability (yield) • Secondary: the rest of the fabrication effort • From the mine to the cryomodule (‘production-like RD’) • Focused charge, well defined deliverable, broad base, expensive task with excellent cost / benefit • US labs are heavily involved but expertise is scattered; Fermilab is playing a “catch-up” game. S. Nagaitsev

4. String test (S2) • Charge: • Recommend a string test strategy; • Expensive • Referendum on the SRF readiness for the ILC • Many duplication / competition / standardization issues between DESY, KEK, FNAL • Cross threaded with mass-production issues, ‘regional interest’ and lab ambitions • R or D? What is the balance? S. Nagaitsev

5. Cavity/CM process and Testing Fail! Cavity Fabrication Surface Processing Vertical Testing Fail! Pass! Horizontal Testing HPR or reprocess He Vessel, couplers, tuner Pass! Cold String Assembly Plan… Develop in labs then transfer technology to industry S. Nagaitsev

6. SCRF Infrastructure • This process requires extensive infrastructure • Bare cavities • Fabrication facilities (Electron beam welder, QC, etc) • Surface treatment facilities BCP & Electro-polish facilities (EP) • Ultra clean H20 & High Pressure Rinse systems • Vertical Test facilities ( Cryogenics + low power RF) • Cavity Dressing Facilities ( cryostat, tuner, coupler) • Class 10/100 clean room • Horizontal Test System (cryogenics and pulsed RF power) • String Assembly Facilities • Large class 10/100 clean rooms, Large fixtures • Cryo-module test facilities • Cryogenics, pulsed RF power, LLRF, controls, shielding, etc. • Beam tests  electron source (RF unit test facility at NML) S. Nagaitsev

7. Materials & SRF R&D infrastructure • Quality assurance: Characterization of Nb sheet from vendors • Surface properties: oxide layer, inclusions, and scratches (eddy scanner) • Measure material composition (RRR, chemical composition, etc) • Measure Nb mechanical properties ( ie crystal structure) • Surface processing studies • Electropolish and BCP process studies (single cell programs) • Surface contamination studies • Infrastructure: (ANL, TJNL, FNAL, Cornell, MSU, etc…) • Labs for handling HF and processing and test of single cells • Materials equipment ( RRR measurement, INSTRON, EM microscope, SIMS. • Weld studies ( e.g. crystal structure, contamination, TIG welding) • ILC is helping to upgrade existing national capabilities but much of this is funded by other sources S. Nagaitsev

8. U.S. Cavity Processing & Test Cavity Fabrication By Industry Surface Processing @ Cornell Surface Processing @ ANL/FNAL Surface Processing @ Jlab Vertical Testing @ Jlab Vertical Testing @ Cornell Vertical Testing @ FNAL Exists Cavity Dressing & Horizontal Testing @ Fermilab Developing S. Nagaitsev

9. Surface Processing @ ANL • FNAL/ANL collaboration • Goal: A new joint surface processing facility • Clean rooms, BCP, and state of the art EP • New Chemistry and Clean rooms operational Controls and HF scrubber New Clean Rooms S. Nagaitsev

10. New Electropolish facility @ANL • World knowledge to design new EP system • Design Review 2/12/07, Under construction • Plan: Commission late FY07 • Capacity ~ 45 EP cycles per year • Plan for new HPR system by late 07 S. Nagaitsev

11. Fermilab SCRF MAP New Muon Lab: RF unit test facility MDB: CCII HTS HINS CAF: MP9 ICB IB1: VTS IARC WH S. Nagaitsev

12. Vertical Test@FNAL • A new Vertical Test Stand is under Construction at Fermilab (IB1) • Existing 1.8 K Cryogenic plant 125 W at 2 K (250 W intermittent test) • RF system based on TJNL VTS RF/DAQ system • Current test Stand will be capable of testing ~50 Cavities/yr • Commissioning started (cryo), reached 2K, next step: single cavity test • Evolutionary upgrades: Thermometry for 9-cells, 2 cavities at a time, 2 top plates, Cryo upgrades: increased pumping capability & purifiers, up to two additional VTS cryostats • Ultimate capacity ~ 264 cavity tests/yr Movable shielding for up to 3 pits New RF & Control Room VTS Cryostat:IB1 S. Nagaitsev

13. HTS @ MDB • Cryostat complete: ~DESY design but 2 Doors improve access • Extensive MDB cryo modifications ~100W@1.8 K • 300 KW klystron & modulator is in place and tested • Cooled down w/o cavity, 1st cavity test in May 1.3 GHz Cavity in HTS Cryostat HTS Cryostat Installed at MDB DESY C22 VTS @ 17 MV/M S. Nagaitsev

14. MDB Infrastructure Cryogenics transfer lines in MDB RF Power for HTS RF Power for HTS Capture Cavity-II Large Vacuum Pump for 2K S. Nagaitsev

15. CAF: MP9 MP9 Clean Room and tooling built in FY06 Infrastructure: • String Assembly Fixtures • Clean Vacuum & Leak Check • Ultra Pure Gas and Water • Ultrasonic Cleaner • Cold Mass Assembly Fixture 1st Cavity being prepared for HTS Ultrasonic Cleaner String Assembly Fixture S. Nagaitsev

16. CAF: ICB Final Assembly • Industrial Center Building (ICB) 18,000 ft2 • Alignment, Instrumentation, coupler installation, etc • Large Vacuum Vessel Assembly Fixture • CAF Goal: Produce R&D quantity Cryomodules (~1/month) • Goal: Use infrastructure for tech transfer to industry • Will Assemble 1st cryomodule (DESY kit) early fall 07 • Also 3.9 GHz! Cryomodule has 1200 parts ! Parts for copy of DESY Assembly fixture ICB cleaned! S. Nagaitsev

17. ILCTA_NML@FNAL CCM removal: Sep 06 NML Building 1st of 2 refrigerators each 60 W@1.8K NML: Apr 07 S. Nagaitsev

18. Two CMs with beam The existing building is perfect for testing two cryomodules with ILC-like beam. The building can be extended to fit 3 cryomodules. S. Nagaitsev

19. ILC RF unit with Beam • Construct a new building ~50m away from NML • Connect by ILC-like tunnel (2nd RF unit) • Upgrade RF system to 10 MW klystron • Add larger 300W @ 1.8 K refrigerator • New Bldg houses diagnostics, dump, refrigerator S. Nagaitsev

20. Summary • Cavities & Cryomodules are cost drivers for ILC • SRF R&D requires extensive infrastructure • The U.S. is making good use of existing SRF assets as well as new ANL/FNAL infrastructure to rapidly expand U.S. SRF R&D capabilities • Infrastructure is needed to support: • GDE S0, S1, S2, S4 goals • U.S. Industrialization of SRF technology • We have made a lot of progress in FY06-07 • We have ambitious plans for FY08 and beyond • Effort is resource limited S. Nagaitsev