Measurements of Direct Photon Double Longitudinal Spin Asymmetry at Large Rapidity

Direct photon production in polarized p-p collisions is expected to be the cleanest measurement of the gluon polarization. Current measurements using inclusive pion production, in the PHENIX central arms, suggest a small contribution from the gluons to the proton spin in the presently accessible Bjorken $x$ range $x_{Bj}>10^{-2}$. The addition of the Nose Cone Calorimeter (NCC) in the large rapidity $1<\eta<3$ will allow PHENIX to access $x_{Bj}\sim 10^{-3}$. In this talk I will present the prospects of measuring direct photon double longitudinal spin asymmetry $A_{LL}$ employing the NCC.