FEL2012 - List of Authors (Jang, K.H.)

Paper

Title

Page

Overall Performance Comparison of S-band, C-band, and X-band Based Compact XFEL Facilities

149

Y. Kim
IAC, Pocatello, IDAHO, USA
K.H. Jang
KAERI, Daejon, Republic of Korea
S. Setiniyaz, M. Titberidze
ISU, Pocatello, Idaho, USA

After successful demonstration of XFEL lasing from C-band based XFEL facility at SPring-8, demand on compact XFEL facilities becomes much stronger. Recently, there were several activities to build much more compact XFEL facilities, which are based on X-band RF linac technology. But up to now, there was no detailed research to compare the performance of S-band, C-band, and X-band RF linac based XFEL facilities. To compare the performance, recently, ISU accelerator and FEL physics group has designed three different XFEL facilities where the S-band, C-band, and X-band RF linac technologies are used for the main FEL driving linacs. In this paper, we describe layouts, start-to-end simulations, and comparison of overall performance of those three XFEL facilities. Finally, we also describe control of energy chirp, RF jitter tolerances, alignment and transverse wakefield issue, and bandwidth of XFEL photon beam in C-band or X-band based XFEL facilities.

WEOC02

Status of the KAERI Table-Top THz Free-Electron Laser Development

Y.U. Jeong, S. Bae, B.H. Cha, B.A. Gudkov, K.H. Jang, K.N. Kim, K. Lee, S.V. Miginsky, J. Mun, S. H. Park, N. Vinokurov
KAERI, Daejon, Republic of Korea
S. Park
Kyungpook National University, Daegu, Republic of Korea

Funding: This work was supported by the World Class Institute (WCI) Program of the NRF funded by the MEST (NRF Grant Number: WCI 2011-001).
Korea Atomic Energy Research Institute is under development of a table-top terahertz (THz) free electron laser (FEL) driven by a conventional microtron accelerator. The THz FEL is composed of a compact variable-period helical undulator and a cylindrical-waveguide resonator with a mesh outcoupling mirror to achieve a small scale. The target wavelength and average power of the system are 400-600 um and 1 W. The energy and peak current of the microtron is designed to be 6.5 MeV and 1 A. We fabricated a compact microtron accelerator including a thermionic RF gun, a magnetron and a modulator having a maximum repetition rate of 200 Hz. We fabricated a variable-period helical undulator having tunable periods of 23-26 mm while keeping the on-axis field strength of 1 T, and total length of 700-800 mm. A compact beamline with two 45-degree bending magnets and 6 permanent-magnet quadrupoles has been designed to transport optimal electron beams to the variable-period helical undulator. A cylindrical-waveguide resonator having a mesh outcoupling mirror and a full mirror with the function of beam dump will decrease the size of the FEL. The size of the FEL is expected to be 2.3 m x 1.6 m.

Slides WEOC02 [6.856 MB]

Paper	Title	Page
MOPD48	Overall Performance Comparison of S-band, C-band, and X-band Based Compact XFEL Facilities	149
	Y. Kim IAC, Pocatello, IDAHO, USA K.H. Jang KAERI, Daejon, Republic of Korea S. Setiniyaz, M. Titberidze ISU, Pocatello, Idaho, USA
	After successful demonstration of XFEL lasing from C-band based XFEL facility at SPring-8, demand on compact XFEL facilities becomes much stronger. Recently, there were several activities to build much more compact XFEL facilities, which are based on X-band RF linac technology. But up to now, there was no detailed research to compare the performance of S-band, C-band, and X-band RF linac based XFEL facilities. To compare the performance, recently, ISU accelerator and FEL physics group has designed three different XFEL facilities where the S-band, C-band, and X-band RF linac technologies are used for the main FEL driving linacs. In this paper, we describe layouts, start-to-end simulations, and comparison of overall performance of those three XFEL facilities. Finally, we also describe control of energy chirp, RF jitter tolerances, alignment and transverse wakefield issue, and bandwidth of XFEL photon beam in C-band or X-band based XFEL facilities.

WEOC02	Status of the KAERI Table-Top THz Free-Electron Laser Development
	Y.U. Jeong, S. Bae, B.H. Cha, B.A. Gudkov, K.H. Jang, K.N. Kim, K. Lee, S.V. Miginsky, J. Mun, S. H. Park, N. Vinokurov KAERI, Daejon, Republic of Korea S. Park Kyungpook National University, Daegu, Republic of Korea
	Funding: This work was supported by the World Class Institute (WCI) Program of the NRF funded by the MEST (NRF Grant Number: WCI 2011-001). Korea Atomic Energy Research Institute is under development of a table-top terahertz (THz) free electron laser (FEL) driven by a conventional microtron accelerator. The THz FEL is composed of a compact variable-period helical undulator and a cylindrical-waveguide resonator with a mesh outcoupling mirror to achieve a small scale. The target wavelength and average power of the system are 400-600 um and 1 W. The energy and peak current of the microtron is designed to be 6.5 MeV and 1 A. We fabricated a compact microtron accelerator including a thermionic RF gun, a magnetron and a modulator having a maximum repetition rate of 200 Hz. We fabricated a variable-period helical undulator having tunable periods of 23-26 mm while keeping the on-axis field strength of 1 T, and total length of 700-800 mm. A compact beamline with two 45-degree bending magnets and 6 permanent-magnet quadrupoles has been designed to transport optimal electron beams to the variable-period helical undulator. A cylindrical-waveguide resonator having a mesh outcoupling mirror and a full mirror with the function of beam dump will decrease the size of the FEL. The size of the FEL is expected to be 2.3 m x 1.6 m.
	Slides WEOC02 [6.856 MB]