Coherent Terahertz Radiation at UVSOR-II

Journal Article · Fri Jan 19 04:00:00 EST 2007 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2436008· OSTI ID:21052619

Katoh, Masahiro; Hosaka, Masahito; Mochihashi, Akira; Shimada, Miho; Kimura, Shin-ichi ^[1]; Takashima, Yoshifumi ^[2]; Takahashi, Toshiharu ^[3]

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1. UVSOR, Institute for Molecular Science, Myodaij-cho, Okazaki, 444-8585 (Japan)
2. Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603 (Japan)
3. Research Reactor Institute, Kyoto University, Kumatori-cho, Sennan-gun, Osaka, 590-0494 (Japan)

Development of intense terahertz radiation source is progressing at UVSOR-II, based on the mechanism of coherent synchrotron radiation (CSR). The terahertz CSR has successfully been produced by two methods. When the storage ring is operated in the single bunch mode with a sufficiently high beam current, intense bursts of terahertz radiation are emitted. Micro-structures in the longitudinal density distribution of the electron bunches created by a beam instability may be the origin of the radiation. The duration of the bursts is typically 100 micro-seconds. The peak intensity is 10000 times higher than that of the normal synchrotron radiation. The bursts appear chaotically or quasi-periodically depending on the beam current with a typical interval of 10 milli-seconds. It has been also demonstrated that the terahertz CSR could be produced by the laser-bunch slicing method. The density modulation produced on the electron bunch by the laser is the origin of CSR. The repetition rate of the terahertz pulses is 1 kHz, which is same as the laser repetition rate. The intensity per pulse is 105 times higher than that of the normal SR.

• OSTI ID: 21052619
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 879; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
BEAM BUNCHING
BEAM CURRENTS
DENSITY
DISTRIBUTION
ELECTRONS
EMISSION
KHZ RANGE
LASERS
MICROSTRUCTURE
MODULATION
PERIODICITY
PHOTON BEAMS
PULSES
STORAGE RINGS
SYNCHROTRON RADIATION
SYNCHROTRON RADIATION SOURCES
THZ RANGE