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Results with initial collimation (July 18, 2007)

This study explores two ways to optimize the collimation system to effectively collimate particles beyond transverse and longitudinal acceptance, reducing power loss and improving efficiency.

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Results with initial collimation (July 18, 2007)

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  1. Results with initial collimation (July 18, 2007) F. Zhou, 8/8

  2. Further collimation optimization • To collimate particles beyond transverse acceptance, two ways: • One straight way is to add betatron collimators before the system end but the power loss at 5 GeV is larger. • The other way is to optimize collimators at low energy to collimate these particles. • To collimate particles beyond longitudinal acceptance: • Can we do it at the low energy? Need phase space rotation. • Have to do it at the 5-GeV LTR • Ratio of the dispersion beam size to the emittance size should be larger F. Zhou, 8/8

  3. New collimation system F. Zhou, 8/8

  4. F. Zhou, 8/8

  5. Positron # along the transport F. Zhou, 8/8

  6. Power loss in DR • Assume 3E10 e+ captured in DR • For shielded target and quarter wave transformation: • Initial collimation: 15.3% capture efficiency, and 9.7 kW loss in DR. • New collimation: 13.7% capture efficiency, and 0.65 kW loss in DR. • Lower power loss in DR is expected but the further sacrifice of the good particles. F. Zhou, 8/8

  7. Power loss in LTR collimators • Assume 3E10 e+ captured in DR • For shielded target and quarter wave transformation: • Initial collimation: 1.4 kW, 26.5 kW, 25.7 kW. • New collimation: 1.4 kW, 15.7 kW, 15 kW, 5.6 kW. May add few more collimators to reduce individual power loss below 10 kW. F. Zhou, 8/8

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