A Radiation-Hard Zero Degree Calorimeter for ATLAS in the HL-LHC era

Run 4 Heavy Ion program of the LHC offers great physics opportunities to ATLAS. The ZDC are increasingly important for characterizing A+A, p+A, γ+A and γ+γ collisions. However, the increasing luminosity places a significant strain on the current ZDCs. Recent developments in rad-hard materials allow the construction of compact rad-hard fast ZDCs to fully exploit the potential for QCD physics during Run 4. ATLAS and CMS Heavy Ion groups are working together to produce high-performance cost-effective ZDCs for this new era.