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This paper presents recent progress in the development and mass production oflarge-area hydrophobic silica aerogels for use as radiators in theaerogel-based ring-imaging Cherenkov (A-RICH) counter, which will be installedin the forward end cap of the Belle II detector. The proximity-focusing A-RICHsystem is especially designed to identify charged kaons and pions. Therefractive index of the installed aerogel Cherenkov radiators is approximately1.05, and we aim for a separation capability exceeding 4$\sigma $ at momenta upto 4 GeV/$c$. Large-area aerogel tiles (over 18 $\times $ 18 $\times $ 2cm$^3$) were first fabricated in test productions by pin drying in addition toconventional methods. We proposed to fill the large end-cap region (area 3.5m$^2$) with 124 water-jet-trimmed fan-shaped dual-layer-focusing aerogelcombinations of different refractive indices (1.045 and 1.055). Guided by thetest production results, we decided to manufacture aerogels by the conventionalmethod and are currently proceeding with mass production. In an electron beamtest undertaken at the DESY, we confirmed that the $K$/$\pi $ separationcapability of a prototype A-RICH counter exceeded 4$\sigma $ at 4 GeV/$c$.

Silica aerogel radiator for use in the A-RICH system utilized in the Belle II experiment