Statistical Analysis of Crossed Undulator for Polarization Control in a SASE FEL

Journal Article · Fri Feb 01 04:00:00 EST 2008 · Phys. Rev. ST Accel. Beams

DOI:https://doi.org/10.1103/PhysRevSTAB.11.030702· OSTI ID:922949

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 (K.-J. Kim, Nucl. Instrum. Methods A 445, 329 (2000)) 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: Stanford Linear Accelerator Center (SLAC)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 922949
• Report Number(s): SLAC-PUB-13061; arXiv:0801.1659
• Journal Information: Phys. Rev. ST Accel. Beams, Journal Name: Phys. Rev. ST Accel. Beams; ISSN 1098-4402
• Country of Publication: United States
• Language: English

Related Subjects

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