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

2. f S. Nagaitsev 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

3. f 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.

4. f 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?

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

6. f 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 H 2 0 & 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)

7. f 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

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

9. f S. Nagaitsev 9  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 New Clean Rooms Controls and HF scrubber Surface Processing @ ANL

10. f S. Nagaitsev 10 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 New Electropolish facility @ANL

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

12. f S. Nagaitsev 12  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 VTS Cryostat:IB1 New RF & Control Room Movable shielding for up to 3 pits Vertical Test@FNAL

13. f 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, 1 st cavity test in May 1.3 GHz Cavity in HTS Cryostat HTS Cryostat Installed at MDB DESY C22 VTS @ 17 MV/M

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

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

16. f S. Nagaitsev 16 CAF: ICB Final Assembly  Industrial Center Building (ICB) 18,000 ft 2  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 1 st cryomodule (DESY kit) early fall 07  Also 3.9 GHz! Cryomodule has 1200 parts ! Parts for copy of DESY Assembly fixture ICB cleaned!

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

18. f 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.

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

20. f 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