An elliptically polarizing undulator (EPU) has been assembled, tested, and installed in the Advanced Light Source (ALS) storage ring. It is a 2 m long pure permanent magnet device with a 5.0 cm period capable of providing polarized radiation ofany ellipticity. This paper reports on the program of magnetic measurements and field tuning, and final magnetic and drive system performance. A summary of measurement results, calculated radiation spectral performance, and a description of the magneticshimming procedure used for field tuning are included
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