  The detection of an electron bunch exiting a strong magnetic field can prove
challenging due to the small mass of the electron. If placed too far from a
solenoid's entrance, a detector outside the magnetic field will be too small to
reliably intersect with the exiting electron beam because the light electrons
will follow the diverging magnetic field outside the solenoid. The TITAN group
at TRIUMF in Vancouver, Canada, has made use of advances in the practice and
precision of photochemical machining (PCM) to create a new kind of charge
collecting detector called the "mesh detector." The TITAN mesh detector was
used to solve the problem of trapped electron detection in the new Cooler
PEnning Trap (CPET) currently under development at TITAN. This thin array of
wires etched out of a copper plate is a novel, low profile, charge agnostic
detector that can be made effectively transparent or opaque at the user's
discretion.
