Jet Measurements in Heavy Ion Collisions with an Upgraded PHENIX Detector, D. Morrison, Brookhaven National Laboratory, Upton, NY,  USA − Measurements of jets from heavy ion collisions are critical to characterizing the properties of the produced hot, dense matter.  A new spectrometer at central rapidity at the PHENIX experiment is being designed which will cover large solid angle with uniform response for electromagnetic and hadronic energy and will enable more precise measurements of jet properties.  A conceptual design for the detector and its expected physics capabilities will be presented.