دورية أكاديمية
Interferometric bunch length measurements of 3 MeV picocoulomb electron beams.
| العنوان: | Interferometric bunch length measurements of 3 MeV picocoulomb electron beams. |
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| المؤلفون: | Yang, X., Yu, L. H., Smaluk, V., Shaftan, T., Doom, L., Kosciuk, B., Cheng, W. X., Bacha, B., Padrazo, D., Li, J. J., Babzien, M., Fedurin, M., Carr, G. L., Zhu, Y. M. |
| المصدر: | Journal of Applied Physics; 2/28/2022, Vol. 131 Issue 8, p1-7, 7p |
| مصطلحات موضوعية: | LENGTH measurement, COHERENT radiation, ELECTRON beams, PARTICLE beam bunching, SIGNAL-to-noise ratio, BOLOMETERS, OPERATING rooms |
| مستخلص: | We report picosecond bunch length measurements using an interferometric method for a 3 MeV electron beam having bunch charge ranging from 1 to 14 pC. The method senses the single-cycle sub-terahertz (THz) pulse emitted by each electron bunch as coherent transition radiation which, in turn, is analyzed using a Michelson-type interferometer, forming an interferogram that is then processed to yield the nominal electron bunch length. This sub-THz coherent radiation intensity was measured using a quasi-optical detector (QOD) operated at room temperature. This experiment was quite challenging since the divergence angle of the sub-THz pulse emitted by the low-energy electron bunch exceeds ±10°, and its pulse energy at the entrance to the detector was as low as 100 pJ. When compared to a conventional helium-cooled silicon composite bolometer designed for frequencies above 0.5 THz, the QOD provided much better signal-to-noise ratio in the ∼80 GHz frequency range, which was critical for the successful measurement of the bunch length. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: | Complementary Index |
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