ILC International Linear Collider ILC SBK Status March
ILC - International Linear Collider ILC SBK Status March 14, 2005 D. Sprehn 10/14/04
ILC - International Linear Collider ILC SBK assumptions • Plug-In for the existing 10 MW device – 110 k. V, 130 A, 1. 3 GHz • Cathode currents for very long life – Designs with < 2 A/cm 2 only considered • Four beam current-density designs are considered – Designs range from 5 A/cm 2 to 20 A/cm 2 • Predicted efficiencies 60% to 65% – Higher values believed possible though there are no examples of rectangular beam devices for empirical extrapolation D. Sprehn Slide 2 3/11/05
ILC - International Linear Collider SBK Cavities – simple single-gap designs • 3 Dimensional simulations of cavity designs show us that a wide variety of cavity sizes and shapes are possible with excellent values for the coupling coefficients, R/Q, and Q. All designs fit into focusing schemes. One such example is shown below and used in the following gain calculations. D. Sprehn Slide 3 3/11/05
ILC - International Linear Collider Design Example-5 cavity rf performance • 5 -cavities with a total rf length <0. 7 m and 70 d. B gain across a 8 MHz band. D. Sprehn Slide 4 3/11/05
ILC - International Linear Collider Beam Transport using rectangular beam and fields from a 3 D magnetic solver • Initial attempts with linear (for ease of investigation) Bx gradient added. Side and top views shown. Actual Bx will be highly non-linear at edge of beam (most desirable). Study of top views indicates ~ -300 G at beam edge is required for good beam confinement. It is also clear to designer that an elliptical beam would vastly improve beam clearance. Investigated here is our most difficult of the four designs under investigation (20 A/cm 2 in the beam) and wiggler-type focusing. D. Sprehn Slide 5 3/11/05
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