Construction of a multiundulator, Revolver No. 19, at the Photon Factory

Abstract
A multiundulator, Revolver No. 19, was constructed and installed at the straight section (B 18-B19) of the 2.5-GeV Photon Factory storage ring. The mechanical structure of Revolver No. 19 consists of a main frame and two rotatable beams with four base plates, on which undulator magnets with four different lengths of period are mounted. A pair of undulator magnets with a desired period length can be selected by revolving the rotatable beams. The energy range of the radiation covered by fundamental peaks from the undulator magnets is from 7.8 to 1150 eV.

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