1 / 1

Beam Based Alignment at ATF

Beam Based Alignment at ATF. Quad and Skew Quad Shunt BBA Procedure. These slope of kick versus B field is then plotted versus beam position. The fit gives the beam position reading at the null of the magnetic field. BBA Procedure make a closed local bump at target BPM

chiara
Download Presentation

Beam Based Alignment at ATF

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Beam Based Alignment at ATF Quad and Skew Quad Shunt BBA Procedure These slope of kick versus B field is then plotted versus beam position. The fit gives the beam position reading at the null of the magnetic field. • BBA Procedure • make a closed local bump at target BPM • use quadrupole or sextupole (skew quad) trims (ΔQ) • make grid scan of bump amplitude and trim setting • for each bump value make difference orbit w.r.t. to trim=0 • fit difference orbits for kick (k) at quadrupole or sextupole • for each bump value fit kick vs trim: k = f (ΔQ) = mΔQ+b • - m is offset from magnetic center • - for some trajectory through the magnet, m = 0 • plot fitted offset vs absolute reading of target BPM • - horizontal intercept is BPM offset Sample orbit to fit a kick at the Quad under test Summary of results For each beam position inside the magnet, the magnet stength is varied and the resulting fitted kicks are fit versus the beam position.

More Related