• Each of the two Booster
extraction septa has a set of vertical dogleg magnets to steer the beam around it during
acceleration.
•More powerful doglegs were installed in 1998 to reduce losses early in
the cycle.
• These magnets have an edge focusing effect
which distorts the horizontal injection lattice:
• 50%
increase in maximum b
• 100%
increase in maximum dispersion.
• Harmonic contributions.
• Effect goes like I2. Now tune to
minimize.
•Recently got an unusual opportunity to explore potential improvements
from fixing the problem.
•Working on schemes to reduce or remove problem.
•