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We calculate the production of prompt and thermal photons from Pb+Pbcollisions at 5.02A TeV at the Large Hadron Collider (LHC) and at 39A TeV atthe proposed Future Circular Collider (FCC) facility. The photon spectra andanisotropic flow at these energies are compared with the results obtained from2.76A TeV Pb+Pb collisions at the LHC for three different centrality bins. Theprompt photons originating from initial hard scatterings are found to increaseby a factor of 1.5 to 2 at 5.02A TeV in the $p_T$ region 2 to 15 GeV and theenhancement is found to be about 5 to 15 times at FCC energy compared to 2.76ATeV in the same $p_T$ region. The evolution of the Quark-Gluon Plasma (QGP)formed in Pb+Pb collisions at LHC and FCC energies are studied using ahydrodynamical model and the $p_T$ spectra and elliptic flow of thermal photonsare calculated using state-of-the-art photon rates. The relative enhancement inthe production of thermal photons is found to be more compared to promptphotons at FCC than at the LHC energies. Although the production of direct(prompt+thermal) photons is found to enhance significantly with increase inbeam energy, the photon elliptic flow increases only marginally and does notshow strong sensitivity to the collision energy.

Photon production from Pb+Pb collisions at {$\sqrt{s_{\rm {NN}}}$} = 5.02 TeV at LHC and at {$\sqrt{s_{\rm {NN}}}$} = 39 TeV at FCC