SASE FEL Polarization Control Using Crossed Undulator

Conference · Tue Sep 30 00:00:00 EDT 2008

OSTI ID:939108

Ding, Yuantao; Huang, Zhirong

There is a growing interest in producing intense, coherent x-ray radiation with an adjustable and arbitrary polarization state. In this paper, we study the crossed undulator scheme for rapid polarization control in a self-amplified spontaneous emission (SASE) free electron laser (FEL). Because a SASE source is a temporally chaotic light, we perform a statistical analysis on the state of polarization using FEL theory and simulations. We show that by adding a small phase shifter and a short (about 1.3 times the FEL power gain length), 90{sup o} rotated planar undulator after the main SASE planar undulator, one can obtain circularly polarized light--with over 80% polarization--near the FEL saturation.

• Research Organization: SLAC National Accelerator Lab., Menlo Park, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 939108
• Report Number(s): SLAC-PUB-13396; TRN: US0806177
• Resource Relation: Conference: Presented at 30th International Free Electron Laser Conference (FEL 2008), Gyeongju, Korea, 24-29 Aug 2008
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
FREE ELECTRON LASERS
POLARIZATION
RADIATIONS
SATURATION
WIGGLER MAGNETS
Accelerators
ACCPHY
XFEL