Zach Kohley    Coincident Fission Fragment Detector (CFFD):  The
production of superheavy nuclei has been accomplished almost
completely through the use of the heavy-ion fusion mechanism.  
In order to understand the dynamics of heavy-ion fusion
reactions we want to measure the binary decay products from the
quasifission reactions (hinderance of fusion) and fusion-fission
reactions (compound nucleus was formed). These measurements are
accomplished with the CFFD.  The primary detectors for the CFFD
(Coincidence Fission Fragment Detector) are four large area (30
cm x 40 cm) position sensitive parallel plate avalanche counters
(PPACs).  Each PPAC consists of two 0.6um foils with 1 mm spaced
gold strips evaporated (40 in the X-direction and 30 in the
Y-direction) and a center foil.  When a fission-like fragment
passes into a PPAC an electron avalanche will be produced.  The
PPAC allows for the the position of each fragment and the time
when it arrived at the detector to be measured.  Inside the CFFD
vacuum chambe