Beam Based Alignment at ATF

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# Beam Based Alignment at ATF - PowerPoint PPT Presentation

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

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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.