Title :
Results of magnetic measurements and field integral compensation for the elliptical multipole wiggler
Author :
Frachon, D. ; Ivanov, P.M. ; Medvedko, E.A. ; Vasserman, I. ; Despe, O. ; Kang, Y.G.
Author_Institution :
APS, Argonne Nat. Lab., IL, USA
Abstract :
A prototype of the Elliptical Multipole Wiggler (EMW) has been assembled, tested and tuned at the APS. This prototype has a period of 160 mm with 7 poles for the hybrid structure and 10 poles for the electromagnet part of the EMW. The hybrid structure of the EMW produces a vertical magnetic field of 0.83 T with Ky=12 for a gap of 27 mm, and the electromagnetic structure provides a horizontal field change up to 100 Hz with a maximum field of 0.12 T (I=0.6 kA, Kx =1.6). The current pulse has a trapezium-type shape with a switching time to change the current polarity of about 2 ms. The measurements and tuning were done for direct current (DC) mode and alternating current (AC) mode. Fine adjustment during the test at the NSLS X-ray ring using the BPMs and active correction system allowed to achieve about 1 μm of beam distortion. It corresponds to the peak-to-peak variations during the time less than ±0.5 G-cm and ±100 G-cm2 of the first and second horizontal field integrals respectively
Keywords :
X-ray production; compensation; electromagnets; magnetic fields; permanent magnets; tuning; wigglers; 0.12 T; 0.6 kA; 0.83 T; 100 Hz; 160 mm; 2 ms; 27 mm; APS; current polarity; current pulse; electromagnetic structure; elliptical multipole wiggler; field integral compensation; horizontal field integrals; hybrid structure; magnetic measurements; trapezium-type shape; tuning; Assembly; Electromagnetic fields; Electromagnets; Magnetic fields; Magnetic variables measurement; Prototypes; Pulse shaping methods; Shape; Testing; Undulators;
Conference_Titel :
Particle Accelerator Conference, 1995., Proceedings of the 1995
Conference_Location :
Dallas, TX
Print_ISBN :
0-7803-2934-1
DOI :
10.1109/PAC.1995.505245
