beam based alignmentofthe debuncher injection septum(alignmentofthe beam based debuncher injection septum).doc
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Beam Based Alignment of the Debuncher Injection Septum
Dave McGinnis
January 8, 2005
Introduction
This document describes the alignment procedure used for the Debuncher Injection Septum. This alignment was done on December 10, 2005. Because the injection septum is motorized, there are more variables than constraints in this procedure. Because of the additional variables, the key idea of this procedure was to constrain the vertical trajectory in the AP2 line to the center of the last three quadrupoles of the AP2 line (Q731, Q732, Q733). Once this constraint is set, the procedure becomes fairly straight forward:
Determine the electrical center of the last three quadrupoles of the AP2 line (Q731, Q732, Q733) by measuring quadrupole steering.
Set the horizontal and vertical closed orbit in the Debuncher though the injection region.,
Adjust the injection kicker voltage and the injection septum current so that the reverse proton trajectory of in the AP2 line goes though the electrical center of the last three quadrupoles of the AP2 line (Q731, Q732, Q733).
Align the angle of the injection septum to be parallel to the reverse proton trajectory in the AP2 line.
Find the vertical injection septum position that gives the desired circulating aperture in the Debuncher.
Find the vertical injection septum position that gives the desired reverse proton extraction aperture.
If the vertical septum positions found in steps 6 and 7 do not match, then the vertical circulating orbit underneath the septum is moved with a local 4 bump and steps 3-6 are repeated until the circulating and extraction apertures match.
Aligning the Angle of the Debuncher Injection Septum
This part of the procedure is to align the angle of the injection septum to be parallel to the reverse proton trajectory in the AP2 line. Originally it was thought that the loss monitors could be used to determine when the beam in the AP2 line scraped against the septum. However, when the barrier bucket RF system (DRF2) is
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