An EIC detector at eRHIC based on the proposed sPHENIX upgrade

One of the proposals for the Electron Ion Collider, eRHIC, would add an electron beam to the current RHIC collider, allowing for polarized e+p collisions as well as collisions of electrons on light and heavy ions. The EIC white paper [1] gives a detailed description of the physics possible with such a machine. The PHENIX experiment at RHIC is currently planning an upgrade, sPHENIX, to its central rapidity detector with a solonoid magnet and electromagnetic and hadron calorimetry to study the quark-gluon plasma with jet probes in heavy ion collisions. We propose to utilize this planned central upgrade--along with an additional forward arm spectrometer for measurements in p+p and p+A of both spin physics and cold (high density) nuclear matter--in e+p and e+A collisions, essentially making this a future eRHIC detector. We present the detector layout for such an eRHIC detector at the current location of PHENIX, and also preliminary studies of its capabilities.\\[4pt] [1] A. Accardi, et al., BNL-98815-2012-JA, JLAB-PHY-12-1652, arXiv:1212.1701