Bonn 2010 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 34: Beschleunigerphysik XII
HK 34.6: Vortrag
Dienstag, 16. März 2010, 18:05–18:20, HG ÜR 9
Terahertz Radiation Production and Terahertz Imaging at Chiang Mai University — •Jatuporn Saisut1,2, Vitoon Jinamool1, Noppadon Kangrang1, Keerati Kusoljariyakul1, Prissana Tamboon3, Pathom Wichaisirimongkol3, Michael W. Rhodes3, and Chitrlada Thongbai1 — 1Department of Physics and Materials Science, Chiang Mai University, Chiang Mai 50200, Thailand — 2DESY,15738 Zeuthen, Germany — 3STIR, Chiang Mai University, Chiang Mai 50200, Thailand
Femtosecond electron bunches can be generated from a system consisting of an RF gun with a thermionic cathode, an alpha magnet as a magnetic bunch compressor, and a linear accelerator as a post acceleration section. These short electron pulses can be used to produce high intensity terahertz (THz) radiation. The THz radiation is generated in the form of transition radiation by placing an aluminum foil (Al-foil) in the electron path, representing a transition between vacuum and Al-foil.
In THz imaging system (transmission measurement), THz radiation is focused on a sample which will be scanned using an xy- translation stage controlled by computer. The transmission intensity (IT) will be detected by a room-temperature pyroelectric detector. Computer program is employed to calculate and analyze the intensity at difference points on the sample for terahertz image construction.
The generation of femtosecond electron bunches, the generation of THz radiation, THz imaging system and the recent experimental results will be presented and discussed