Statistical Analysis of Crossed Undulator for Polarization Control in a SASE FEL
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:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76SF00515
- OSTI ID:
- 922949
- Report Number(s):
- SLAC-PUB-13061; arXiv:0801.1659; TRN: US0801869
- Journal Information:
- Phys. Rev. ST Accel. Beams, Journal Name: Phys. Rev. ST Accel. Beams; ISSN 1098-4402
- Country of Publication:
- United States
- Language:
- English
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