Magnetic Performance of the Advanced Light Source EPU5.0 Elliptically Polarizing211 Undulator

摘要

An elliptically polarizing undulator (EPU) has been assembled, tested, and211u001einstalled in the Advanced Light Source (ALS) storage ring. It is a 2 m long pure 211u001epermanent magnet device with a 5.0 cm period capable of providing polarized 211u001eradiation of any ellipticity. This paper reports on the program of magnetic 211u001emeasurements and field tuning, and final magnetic and chive system performance. A 211u001esummary of measurement results, calculated radiation spectral performance, and a 211u001edescription of the magnetic shimming procedure used for field tuning are 211u001eincluded.