The Orthogonal Transfer Array (OTA) is a monolithic array of small CCDs that are 4 - side buttable and can be mosaicked to make the 40K×40K focal plane required by Pan-STARRS. These devices have other interesting properties such as a 'Deep Depletion' structure which enables 75 μm thick devices to be fully depleted with modest charge diffusion, while offering 35 % QE at 1 μm. Pan-STARRS has evaluated OTAs from a test lot, and is now fabricating the first two production lots. We expect to deploy the first of four cameras in June 2006.
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