Publications (2)5.45 Total impact
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Article: An SRRC elliptically polarizing undulator prototype to examine mechanical design feasibility and magnetic field performance.
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ABSTRACT: In this work, a 1 m long Sasaki-type elliptically polarizing undulator (EPU) prototype with 5.6 cm period length is used to examine the mechanical design feasibility as well as magnetic field performance. The magnetic field characteristics of the EPU5.6 prototype at various phase shifts and gap motion are described. The field errors from mechanical tolerances, magnet block errors, end field effects and phase/gap motion effects are analysed. The procedures related to correcting the field with the block position tuning, iron shimming and the trim blocks at both ends are outlined.Journal of Synchrotron Radiation 06/1998; 5(Pt 3):420-2. · 2.73 Impact Factor -
Article: Advanced field-measurement method with three orthogonal Hall probes for an elliptically polarizing undulator.
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ABSTRACT: A three-orthogonal-Hall-probe assembly with an 'on the fly' mapping method has been developed to characterize an elliptically polarizing undulator (EPU). The underlying design concept is that it can measure the three real field components without any field correction under a reliable and synchronization measurement method. Therefore, the relative central position shift, orthogonal angle and the planar Hall effect error between the three Hall probes should be calibrated and readjusted. Experimental results demonstrate that this method can yield an r.m.s. reproducibility of 10 G cm for the three field components and 2 G for the peak field strength. Under precision conditions this system can completely measure the three on-axis field components within 2 min for a 4 m-long EPU.Journal of Synchrotron Radiation 06/1998; 5(Pt 3):471-4. · 2.73 Impact Factor
