2007 Fiscal Year Final Research Report Summary
Research of High Quality Electron Beam and THz-FEL Based on Numerical Simulation for Electromagnetic Fields Employing a 3-D FDTD Method
| Project/Area Number |
17360035
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied physics, general
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| Research Institution | Tohoku University |
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Principal Investigator |
HAMA Hiroyuki Tohoku University, Graduate School of Science, Professor (70198795)
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| Co-Investigator(Kenkyū-buntansha) |
KAWAI Masayuki Tohoku University, Graduate School of Science, Associate Professor (60374899)
HINODE Fujio Tohoku University, Graduate School of Science, Research Associate (60292207)
MUTO Toshiya Tohoku University, Graduate School of Science, Researcher (10431496)
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| Project Period (FY) |
2005 – 2007
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| Keywords | FDTD method / high-brilliant electron beam / free electron laser / numerical simulation / RF gun / Terahertz radiation / Smith-Purcell radiation / femto-second electron beam |
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| Research Abstract |
In this research work, we have investigated concerning high-brilliant electron beam and free electron laser (FEL) oscillation by means of numerical simulation employing Finite Difference Time Domain (FDTD) method as a Maxwell's equations solver. As a first step, beam characteristics produced by a thernionic RF gun was studied by the FDTD simulation. Results of the work have improved design work of the actual RF gun. In the 2nd year, the beam optics for the bunch compression has been optimized by using results of the FDTD simulation, then it was found that there would be a possibility of producing very short electron bunch length around 70 femto-second. In addition, properties of coherent synchrotron radiation in Terahertz region were studied theoretically and a basic layout of light source accelerator has been designed. As the simulation code has been progressed, the beam dynamics in a bunch compressor was precisely evaluated by taking the effect of space charge into account. As the result the possibility of producing 100 femto-second beam bunch and its application for a new accelerator based coherent light source were pointed out.
Meanwhile lasing of Smith-Purcell backward wave oscillator (BWO) FEL using a low energy DC beam was successfully simulated by using the FDTD code. It was found that the dc beam having the normalized emittance less than 1 mm mrad and the kinetic energy of less than 50 keV is required for Smith-Purcell BWO FEL. This source is concluded to be very promising and unique for future narrowband intense sub-Terahertz radiation.
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Research Products
(30 results)
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[Journal Article] Development of an injector to generate a very short bunch for a super coherent terahertz light source project2007
Author(s)
T. Tanaka, T. Muto, F. Hinode, M. Kawai, K. Nanbu, K. Kasamsook, K. Akiyama, M. Yasuda, H. Hama, H. Tanaka, N. Kumagai
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Journal Title
Proc. 4th Asian Particle Accelerator Conference, Indore
Pages: 178-180
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Development of a low emittance dc gun for Smith-Purcell BWO FEL2007
Author(s)
K. Kasamsook, K. Akiyama, K. Nanbu, M. Kawai, F. Hinode, T. Muto, T. Tanaka, M. Yasuda, Y. Mori, H. Hama
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Journal Title
Proc. 29th International Free Electron Laser Conference, Novosibirsk
Pages: 417-419
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Coherent THz light source using very short electron bunches from a thermionic rf gun2007
Author(s)
T. Muto, T. Tanaka, F. Hinode, M. Kawai, K. Nanbu, K. Kasamsook, K. Akiyama, M. Yasuda, Y. Mori, H. Hama
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Journal Title
Proc. 29th International Free Electron Laser Conference, Novosibirsk
Pages: 476-478
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Conceptual design of an isochronous ring to generate coherent terahertz synchrotron radiation2006
Author(s)
H. Hama, H. Tanaka, N. Kumagai, M. Kawai, F. Hinode, T. Muto, K. Nanbu, T. Tanaka, K. Kasamsook, K. Akiyama, M. Yasuda
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Journal Title
New Journal of Physics 8
Pages: 292-304
Description
「研究成果報告書概要(和文)」より
Peer Reviewed
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[Journal Article] Super coherent THz light source based on an isochronous ring with very short electron bunches2006
Author(s)
T. Tanaka, T. Muto, F. Hinode, M. Kawai, K. Nanbu, K. Kasamsook, K. Akiyama, M. Yasuda, H. Hama, H. Tanaka
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Journal Title
Proc. 28th International Free Electron Laser Conference, Berlin
Pages: 371-373
Description
「研究成果報告書概要(欧文)」より
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