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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) F. Zhou, 8/8
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
New collimation system F. Zhou, 8/8
Positron # along the transport F. Zhou, 8/8
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
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