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The proposed linac is powered by switched pulses instead of radio frequency power, using distributed photodiodes driven by short pulses of light. If the required photodiode and light source requirements can be met, this device will have the following advantages; 1) Very short pulses can be produced by the high pervaence photodiodes, leading to a small stored energy. 2. The distribution of the power source over the whole accelerator surface allows a high density which can produce a large gradient. 3. The short pulse reduces the heating of accelerator structure and other gradient limitations. 4. The power switching can be highly efficient. 5. It is straightforward to recover most of the energy in the pulse, raising the overall efficiency or allowing the beam loading to be lowered for fixed efficiency. 6. The high gradient and low beam loading give low wake field effects, and good output emittance.