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Latest Design of ILC （ RDR)

Latest Design of ILC （ RDR). A Primary Cost Driver for ILC -- Superconducting RF Technology. 1.3 GHz technology developed by TESLA Collaboration , R&D from 1992 to reduce the cost per MeV by a factor of 20 from current SCRF installations (CEBAF).

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Latest Design of ILC （ RDR)

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  1. Latest Design of ILC（RDR)

  2. A Primary Cost Driver for ILC -- Superconducting RF Technology • 1.3 GHz technology developed by TESLA Collaboration, • R&D from 1992 to reduce the cost per MeV by a factor of 20 from current SCRF installations (CEBAF). • Increased the operating accelerating gradient by a factor of 5 : • ~5 MV/m to ~25 MV/m, • Reduced the cost per meter by a factor of four for large-scale production. • TESLA cavity R&D based on CERN, CEBAF (JLAB), Cornell University. KEK, Saclay and Wuppertal. • Basic element of the technology is a nine-cell 1.3 GHz niobium cavity. • Approximately 160 of these cavities have been fabricated by industry as part of R&D program at DESY.

  3. Principle of 50MV/m Cavity shape designs with low Hp/Eacc TTF: TESLA shape Reentrant (RE): Cornell Univ. Low Loss(LL): JLAB/DESY IchiroｰSingle(IS): KEK

  4. ICHIRO Cavity . Goal： 51 MV/m

  5. Fabricated Six ICHIRO Single Cells Deep-drawn Nb cups • Six IS cavities were fabricated (IS#2, #3, #4, #5, #6, #7). • Series of tests done to optimize KEK surface treatment. • Electron Beam Welding (EBW) • Both KEK in-house machine and industrial machine were used

  6. Centrifugal Barrel Polishing (CBP) Mechanical Grinding Stones and water • KEK CBP • Rough stones + water : 4 hours x 3 times • Removal thickness = 25 μm x 3 = 75 μm • Fine stones + water : 4 hours x 3 times • Removal thickness = 20 μm x 3 = 60 μm • Total removal thickness = 135 μm. Rough stones Fine stones

  7. Light Chemical Polishing Annealing - Degassing • Light Chemical Polishing (CP) HF(46%) : HNO3(60%) : H3PO4(85%) 1 :1 : 1 in volume • CP for 1 minute at 25 OC. • Removal thickness = 10 μm. • Prepare smooth surface before EP. • Annealing/Degassing in furnace • 750 OC for 3 hours • Degassing of hydrogen important. • Temperature and time optimized for cavity softness and cost.

  8. Measurement of and Unloaded Q-value Measure time constant for cavity to “ringing down” when RF switched off Accelerating Field Geometric Factor

  9. Schematic of Experimental Setup 1.9K LHe Cavity in Cryostat Signal Generator Power Meters Phase Locked Loop Q of Cavity is very large

  10. Re-Entrant Cavity - Best Eacc = 59 MV/m • Manufactured @ Cornell • Surface preparation at KEK • Vertical test @ Cornell

  11. International Collaborations （ILC WG5-Asia） Korea, Pusan Univ: CHO (student) stayed in Mar 2005 IHEP: Shi Hua (engineer) stayed Feb - Mar 2005 Korea, PAL: Y. uk SOHN stayed Mar – Aug 2005 (WG5 Korea convener) Canada, Toronto Univ: Prof. Robert ORR stays from Aug 2005 for 1 year Korea, CHEP, Kyungpook Univ.: Prof. Hyoung Suk KIM stayed Jan-Mar 2006 IHEP: GE Mingqi (student) stayed Jan– Mar 2006 LNL-INFN: Giullia LANZA (student) stays Jan – Mar 2006.

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