Observation of optical transition radiation from electron beams generated by laser plasma accelerator

LIN Chen; Van Tilborg; GUO Zhi-Yu

doi:10.1088/1674-1137/37/2/027003

Chinese Physics C> 2013, Vol. 37> Issue(2) : 027003 DOI: 10.1088/1674-1137/37/2/027003

Observation of optical transition radiation from electron beams generated by laser plasma accelerator

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Abstract：
Laser plasma accelerators (LPAs) have made great progress, achieving electron beam with energy up to 1 GeV from a centimeter scale capillary plasma waveguide. Here, we report the measurement of optical transition radiation (OTR) from the capillary-based LPA electron beams. Transition radiation images, produced by electrons passing through two separate foils (located at 2.3 m and 3.8 m away from the exit of the LPA) were recorded with a high resolution imaging system, respectively. Two magnetic quadrupole lenses were placed right after the capillary to focus and collimate the electron beams. Significant localized spikes appeared in the OTR images when the electron beam was focused by the magnetic quadrupole lenses, indicating the coherence of the radiation and the existence of ultrashort longitudinal structures inside the electron beam.

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LIN Chen, Van Tilborg and GUO Zhi-Yu. Observation of optical transition radiation from electron beams generated by laser plasma accelerator[J]. Chinese Physics C, 2013, 37(2): 027003. doi: 10.1088/1674-1137/37/2/027003

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Received: 2012-03-19
Revised: 1900-01-01

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Observation of optical transition radiation from electron beams generated by laser plasma accelerator

Received Date: 2012-03-19

Accepted Date: 1900-01-01

Available Online: 2013-02-05

Abstract: Laser plasma accelerators (LPAs) have made great progress, achieving electron beam with energy up to 1 GeV from a centimeter scale capillary plasma waveguide. Here, we report the measurement of optical transition radiation (OTR) from the capillary-based LPA electron beams. Transition radiation images, produced by electrons passing through two separate foils (located at 2.3 m and 3.8 m away from the exit of the LPA) were recorded with a high resolution imaging system, respectively. Two magnetic quadrupole lenses were placed right after the capillary to focus and collimate the electron beams. Significant localized spikes appeared in the OTR images when the electron beam was focused by the magnetic quadrupole lenses, indicating the coherence of the radiation and the existence of ultrashort longitudinal structures inside the electron beam.

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