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SEM403 Study of Orbit Separation

This report presents the findings from the SEM403 study on orbit separation, with the last analysis conducted in May 2001. Recent observations indicated a 30 mm separation between the injection orbit and closed orbit at SEM403 and ISEP. The study examines model discrepancies, beam emittance versus admittance, and the resulting implications for the Debuncher Injection Septum. Key data include beam half-width measurements and detailed separations for both separate and modified vacuum conditions. This investigation enhances our understanding of the injection process and its operational parameters.

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SEM403 Study of Orbit Separation

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  1. SEM403 Study of Orbit Separation • Last study of this sort was performed May 2001 • Two weeks ago comment was made that separation of injection orbit from closed orbit was 30mm at SEM403 and ISEP. • Look at models, do the experiment and look at modified Debuncher Injection Septum

  2. Closed Orbit Injection Orbit A few mysteries: -Missing wire data in Hor. -Beam emittance much smaller than admittance Debuncher scraper IN No circulating beam

  3. Many Numbers Frank Bieniosek pbar note #595 Jun 1998 (includes max 6.81rad @ 64.5kV) OptiM beamline model Nov 2004 IKIK to ISEP

  4. What Separation is Needed at the Downstream End of the Injection Septum? • y =9.95m • 40(35) mm-mrad beam • Beam half width is 19.95(18.66)mm • Material between injection channel of ISEP and closed orbit chamber: • “Was” {separate vacuum} 12.27mm • “Modified” {common vacuum} 5.72mm • Separation Needed • “Was” 52.2(49.6)mm • “Modified” 45.6(43.0)mm

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