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The idea of using fixed-target annihilations of a high-energy positron beamon a target for producing a new, very feebly interacting particle has beenexploited by the PADME experiment at LNF using the extracted beam from theLINAC in the BTF facility. Extracting the beam from a synchrotron would improveby several orders of magnitude the duty-cycle of the LINAC, thus greatlyextending the physics reach of such experiments. The option of substituting orcomplementing the standard, slow 1/3 of integer resonant extraction techniqueby using coherent phenomena in a bent crystal, like the channeling has beenstudied by the SHERPA experiment. Both using the DAFNE main positron ring orthe smaller damping ring (accumulator) as pulse extender of the LINAC have beenconsidered.  We here propose to demonstrate the feasibility of this technique performingan experiment on the DAFNE positron main ring, installing in a suitable vacuumgoniometer a thin Silicon crystal, bent in the (110) direction in order toprovide a ~1 mrad kick, and then simulating the extraction process with avirtual septum: instead of performing a real extraction, the crossing of thegap of a septum magnet is simulated by detecting positrons at its position (atphase advance close to 1/4) by means of a Silicon pixel detector inserted inthe ring, in a secondary vacuum of a Roman pot.

SHERPAD: test of Slow high-efficiency extraction of Positrons from a Ring At DAFNE