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In the Simulations and Constructions of the Reionization of Cosmic Hydrogen(SCORCH) project, we present new radiation-hydrodynamic simulations withupdated high-redshift galaxy populations and varying radiation escapefractions. The simulations are designed to have fixed Thomson optical depth$\tau \approx 0.06$, consistent with recent Planck observations, and similarmidpoints of reionization $7.5 \lesssim z \lesssim 8.0$, but with differentionization histories. The galaxy luminosity functions and ionizing photonproduction rates in our model are in good agreement with recent HSTobservations. Adopting a power-law form for the radiation escape fraction$f_{\text{esc}}(z) = f_8[(1+z)/9]^{a_{8}}$, we simulate the cases for $a_8 =0$, 1, and 2 and find $a_8 \lesssim 2$ in order to end reionization in therange $5.5 \lesssim z \lesssim 6.5$ to be consistent with Lyman alpha forestobservations. At fixed $\tau$ and as the power-law slope $a_8$ increases, thereionization process starts earlier but ends later with a longer duration$\Delta z$ and the decreased redshift asymmetry $Az$. We find a range ofdurations $3.9 \lesssim \Delta z \lesssim 4.6$ that is currently in tensionwith the upper limit $\Delta z < 2.8$ inferred from a recent joint analysis ofPlanck and South Pole Telescope observations.

SCORCH. II. Radiation-Hydrodynamic simulations of reionization with varying radiation escape fractions