Baffle Design

Baffles Design

Designing baffles from ray traces requires GEMC runs without baffles, but detectors at the baffle z positions.

Fitting trajectory paths

We define as fixed number of blocks which expand over a radius that will accept the full angular range from the whole target. Each block then has a range in phi, which we fit:

Designing baffle openings

These are then considered, for each block over all baffles, to carve out an opening which does not allow particles below a momentum from making it through. There is a maximum opening which is defined from the number of sectors, along with a minimum "dead zone" which prevents photons.

CLEO Baffle openings (before introduction of wedge)

Older Baffle Comparisons

Seamus' Baffle Comparisons

Eugene's BaBar Design in GEMC	[1]
Eugene's for Other Magnets	[2]
Basic New Designs	[3]
New design from ray tracing	[4]

Eugene's Baffles

Zhiwen's Evaluation of Eugene's Baffles in GEMC