| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2013: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2012: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000)
Fiscal Year 2011: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2010: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2009: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Research Abstract |
A novel terahertz spectroscopy method has been investigated. The method is based on two phenomena: the coherent radiation emitted from the ultra-short electron bunch and Cherenkov radiation induced by electron passing vicinity of the surface of dielectric materials. Coherent Cherenkov radiation is produced when the electron velocity exceeds the phase velocity of the radiation inside the dielectrics.
Development of a 100 femto-second photoinjector revealed that the saturation current density was much higher than that of the long-pulsed electron gun, and the remarkable elongation of the electron bunch length under the saturation. In the study of the radiation, the threshold acceleration voltage for the generation of the Cherenkov radiation was observed. Measured threshold was agreed well with the theoretical prediction. We conclude that the principle of the Coherent Cherenkov radiation spectroscopy could be demonstrated.
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