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ACD Cavity Shapes

ACD Cavity Shapes. Rong -Li Geng Jefferson Lab ILC08, November 16-20, 2008, UIC. Low-loss (Ichiro) Shape. Many 1-cell cavities reached excellent > 45 MV/m results. ICHIRO5 (no HOM coupler) reached 36 MV/m in 2008 under KEK/JLab collaboration

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ACD Cavity Shapes

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  1. ACD Cavity Shapes Rong-Li Geng Jefferson Lab ILC08, November 16-20, 2008, UIC

  2. Low-loss (Ichiro) Shape • Many 1-cell cavities reached excellent > 45 MV/m results. • ICHIRO5 (no HOM coupler) reached 36 MV/m in 2008 under KEK/JLab collaboration • New 9-cell cavities w/ improved end group design fabricated and being processed and tested at KEK ILC08, 11/16-20, 2008, UIC

  3. K. Saito et al ILC08, 11/16-20, 2008, UIC

  4. First Ichiro 9-cell test in a cryo-module T. Saeki et al., EPAC08 ILC08, 11/16-20, 2008, UIC

  5. Re-entrant Shape • Single-cell 60 mm aperture Re-entrant cavity reached record gradient 59 MV/m in 2007 under Cornell/KEK collaboration • First 9-cell re-entrant cavity 15 MV/m quench limited due to pit. Further processing and testing under way at Cornell ILC08, 11/16-20, 2008, UIC

  6. 59 MV/m single-cell Re-entrant R.L. Geng et al., PAC07 First 9-cell Re-entrant cavity by Cornell/AES H. Padamsee et al., PAC07 ILC08, 11/16-20, 2008, UIC

  7. A New ACD ShapeLow-Surface-Field (LSF) proposed by SLAC • The Low Surface Field (LSF) Design • 15% higher R/Q than TDR • 11% lower Bs/Ea  20% lower cryogenic heating • 15% lower Es/Ea than LL design, same as TDR • Field flatness 20% more sensitive to cell error than LL Z. Li and C. Adolphsen, LINAC08 ILC08, 11/16-20, 2008, UIC

  8. Opportunities and Challenges • Potential of higher gradients for shorter linac length. • Excellent single-cell results demonstrated for both low-loss/Ichiro and re-entrant shapes. • LSF shape has further improved surface field ratios. • Increased detuning challenge due to reduced mechanical strength. • Increased field flatness preservation challenge due to reduced cell-to-cell coupling. • Simulation results show acceptable emittance dilution for 60 mm aperture. Beam test is still yet to happen to fully justify. ILC08, 11/16-20, 2008, UIC

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