Because of many special benefits of the Small Modular Reactors (SMRs) and the Accelerator Driven Subcritical Reactors (ADSRs), they are subject of a large number of studies all over the world. In the present work, the ADS photoneutron target for Holos reactor was designed and optimized by using MCNPX2.6 code. The Continuous Slowing Down Approximation (CSDA) ranges of passing electrons through tantalum, tungsten, mercury, lead and lead-bismuth were investigated. The production and leakage rates

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... or neutrons and photons, and therefore, the deposited heat from neutrons and photons were calculated considering the electron beam bombardment of tantalum, tungsten, mercury, lead and leadbismuth targets at beam energies of 100-1000 MeV. Other factors such as the optimization of photoneutron target dimensions for 20 and 200 MeV electron beams, and choosing of the optimal energy of incident electrons for the optimized photoneutron target were examined.