CERN Accelerating science

Article
Title	Analysis and Design of Backing Beam for Multipole Wiggler (MPW14) at PLS
Author(s)	Lee, Hong-Gi ; Eon Kim Dong ; Jung, Young-Gyu ; Park, Ki-Hyeon ; Sik Han, Hong ; Suck Suh, Hyung ; Wha Chung, Chin ; Woo Lee, Wol
Affiliation	(MPW14) ; (PAL, Pohang)
Publication	2005
In:	21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.3940
Subject category	Accelerators and Storage Rings
Abstract	Pohang Accelerator Laboratory (PAL) had developed and installed a Multipole Wiggler (MPW14) to utilize high energy synchrotron radiation at Pohang Light Source (PLS). The MPW14 is a hybrid type device with period of 14 cm, minimum gap of 14 mm, maximum flux density of 2.02 Tesla and total magnetic structure length of 2056 mm. The support locations and structure of an insertion device are optimized to achieve a minimum deflection due to the magnetic loads. A Finite Element Analysis (FEA) is performed to find out the amount of maximum deflection and optimal support positions on the backing beam, the support and drive structures of the MPW14 under expected magnetic load of 14 tons. To reduce the deflection effect further, two springs are designed and installed to compensate the gap dependent magnetic loads. The optimized deflection is estimated to be about 20.6 ? while the deflection before optimization is 238 ?.